PubMed Health⌕ Search

Biomedical subjects

C M Spencer

Publications and source records attributed to C M Spencer.

At least 19 recordsLinked to original sources
PubMed2001

Dynamics of c-fos and ICER mRNA expression in rat forebrain following lithium chloride injection.

Lithium is commonly used as a treatment for affective disorders in humans and as a toxin to produce conditioned taste aversions in rats. LiCl administration in rats has been correlated with activation of c-fos and cAMP-mediated gene transcription in many brain regions; however, little is known about the timing or duration of gene activation. We hypothesized that c-fos gene transcription is rapidly stimulated by LiCl, followed later by the expression of the inducible cAMP early repressor (ICER) transcription factor, a negative modulator of cAMP-mediated gene transcription. By in situ hybridization, we analyzed the timecourse of c-fos and ICER mRNA expression in the central nucleus of the amygdala (CeA), the paraventricular nucleus of the hypothalamus (PVN) and the supraoptic nucleus (SON) at seven time points (0, 0.3, 1, 3, 6, 9 and 12 h) after intraperitoneal LiCl injection (0.15 M, 12 ml/kg, 76 mg/kg). Expression of c-fos mRNA peaked between 20 min and 1 h and returned to baseline by 3 h in the CeA, PVN and SON. ICER mRNA was detected in these regions at 20 min, peaked at 1-3 h and returned to nearly baseline 9 h following LiCl injection. The time lag between c-fos mRNA expression and ICER mRNA expression within the same regions is consistent with ICER terminating c-fos gene transcription. However, no refractory period was detected for restimulation of c-fos transcription by a second injection of LiCl during the period of peak ICER mRNA expression, suggesting the involvement of other transcriptional modulators.

Amygdala↗
PubMed2001

Amifostine: an update on its clinical status as a cytoprotectant in patients with cancer receiving chemotherapy or radiotherapy and its potential therapeutic application in myelodysplastic syndrome.

UNLABELLED: Amifostine (WR-2721) is a cytoprotective agent that protects a broad range of normal tissues from the toxic effects of chemotherapy and radiotherapy without attenuating tumour response. This selective protection is due to the greater conversion and uptake of the active metabolite, WR- 1065, in normal versus neoplastic tissues. In a pivotal phase III trial, 242 patients with advanced ovarian cancer were randomised to receive treatment with cisplatin 100 mg/m2 and cyclophosphamide 1000 mg/m2 every 3 weeks with or without pretreatment with intravenous amifostine 910 mg/m2. Over 6 cycles of therapy, amifostine significantly reduced haematological, renal and neurological toxicities: treatment delays, treatment discontinuation and days in hospital related to these adverse events were also significantly reduced in patients receiving amifostine versus patients receiving chemotherapy alone. In another randomised phase III trial in 303 patients with head and neck cancer undergoing irradiation therapy (total dose 50 to 70Gy), pretreatment with intravenous amifostine 200 mg/m2 significantly reduced the incidence of acute and late grade > or =2 xerostomia. However, mucositis was not significantly reduced in amifostine recipients compared with patients receiving radiotherapy alone, although this has been shown in smaller randomised trials. Amifostine (340 mg/m2) also provided significant protection against pneumonitis and oesophagitis in patients with lung cancer receiving thoracic irradiation in a preliminary report from a phase III trial (n = 144). Other studies have demonstrated protective effects of amifostine in other tumour types and other chemotherapy, radiation and radiochemotherapy regimens; however, evidence is still limited in these indications. No evidence of tumour protection by amifostine has been demonstrated in any clinical trials. Amifostine has also been shown to stimulate haematopoietic stem cells and has been investigated as a therapy for patients with myelodysplastic syndrome in number of small preliminary studies. At the recommended dose and schedule, amifostine is generally well tolerated. Adverse effects are usually reversible and manageable and those most frequently experienced include nausea and vomiting, transient hypotension and somnolence and sneezing. CONCLUSION: The results of phase III trials have confirmed the safety and efficacy of amifostine as a cytoprotectant to ameliorate cisplatin-induced cumulative renal toxicity, for which it is the only agent proven to be effective, and neutropenia in patients with advanced ovarian cancer, and to reduce xerostomia in patients with head and neck cancer receiving irradiation therapy. Depending on the outcome of numerous ongoing clinical trials, amifostine may eventually find broader clinical applications, both as a cytoprotectant and as a potential therapy in myelodysplastic syndrome.

Amifostine↗
PubMed2001

Alendronate: an update of its use in osteoporosis.

UNLABELLED: Alendronate (alendronic acid) is a nitrogen-containing bisphosphonate which binds to bone surfaces and inhibits bone resorption by osteoclasts. Oral alendronate 5 or 10 mg/day produces sustained increases in bone mineral density (BMD) in postmenopausal women with or without osteoporosis, in men with primary osteoporosis and in both men and women with or without osteoporosis receiving systemic corticosteroid therapy. Histomorphometric analyses have found that alendronate does not appear to impair bone quality. Alendronate reduced the risk of radiographic vertebral fracture, clinical vertebral fracture or hip fracture by 47 to 56% in postmenopausal women who had > or = 1 existing vertebral fracture and in those with no existing vertebral fractures but who had osteoporosis. In a number of comparative trials in postmenopausal women with osteoporosis, alendronate 10 mg/day was found to be more effective at inducing sustained increases in BMD than intranasal calcitonin, and at least as effective as conjugated estrogens and raloxifene. Alendronate 70 mg administered once weekly and 35 mg twice weekly are as effective at increasing BMD as 10 mg/day in this patient group. In clinical trials, alendronate was generally well tolerated when taken as recommended. Adverse events tended to be transient and associated with the upper GI tract, most commonly including abdominal pain, nausea, dyspepsia, acid regurgitation and musculoskeletal pain. No statistically significant differences between alendronate 10 mg/day and placebo have been found in the incidence of upper GI adverse events in large clinical trials. However, postmarketing surveillance reported a low incidence of adverse events related to the oesophagus. Specific instructions aimed at reducing the risk of upper GI adverse events have been provided by the manufacturer. CONCLUSIONS: Alendronate is effective and generally well tolerated in the treatment of women or men with primary (including postmenopausal) or corticosteroid-induced osteoporosis and in the prevention of osteoporosis in postmenopausal women. The drug has been associated with upper GI tract adverse events, although the extent to which alendronate is responsible for these events has not been clearly established. Alendronate should be considered a treatment of choice in postmenopausal women with osteoporosis. Alendronate is also a suitable treatment option for primary osteoporosis in men and for corticosteroid-induced osteoporosis in both men and women.

Adult↗
PubMed2001

Gemtuzumab ozogamicin.

Gemtuzumab ozogamicin is a humanised monoclonal IgG4 antibody, linked to a cytotoxic calicheamicin derivative. It effects cell necrosis by specifically targeting the CD33 antigen which is expressed on the surface of leukaemic cell blasts in more than 90% of patients with acute myeloid leukaemia (AML), but is not present on normal stem cells. Therapy with gemtuzumab ozogamicin (2 doses of 9 mg/m2) in 3 noncomparative studies produced complete remission in 16% of adult patients with AML in first relapse, and complete remission with incomplete platelet recovery in an additional 13% of patients. Rates of remission did not differ between those aged less than 60 years and older than 60 years. Many patients were able to receive both doses of gemtuzumab ozogamicin therapy as outpatients. Survival duration was similar between those treated as outpatients and those requiring hospitalisation. About one-third of 11 children and adolescents treated with 2 doses of 9 mg/m2 gemtuzumab ozogamicin in a phase I study showed <5% bone marrow blasts after completion of therapy. The most commonly encountered adverse events in clinical trials with gemtuzumab ozogamicin were myelosuppression, increased levels of hepatic enzymes, infection, fever, bleeding, chills, nausea and vomiting and dyspnoea. No treatment-related renal failure or alopecia was reported.

Adolescent↗
PubMed2001

Aceclofenac: a reappraisal of its use in the management of pain and rheumatic disease.

UNLABELLED: Aceclofenac is an orally administered phenylacetic acid derivative with effects on a variety of inflammatory mediators. Through its analgesic and anti-inflammatory properties, aceclofenac provides symptomatic relief in a variety of painful conditions. In patients with osteoarthritis of the knee, the drug decreases pain, reduces disease severity and improves the functional capacity of the knee to a similar extent to diclofenac, piroxicam and naproxen. Aceclofenac reduces joint inflammation, pain intensity and the duration of morning stiffness in patients with rheumatoid arthritis, and is similar in efficacy to ketoprofen, diclofenac, indomethacin and tenoxicam in these patients. The duration of morning stiffness and pain intensity are reduced, and spinal mobility improved, by aceclofenac in patients with ankylosing spondylitis, with improvements being similar to those observed with indomethacin, naproxen or tenoxicam. Aceclofenac is also effective in other painful conditions (e.g. dental and gynaecological). In contrast to some other NSAIDs, aceclofenac has shown stimulatory effects on cartilage matrix synthesis. Aceclofenac is well tolerated, with most adverse events being minor and reversible, and affecting mainly the GI system. Although the incidence of GI adverse events with aceclofenac was similar to those of comparator NSAIDs in individual clinical trials, withdrawal rates due to these events were significantly lower with aceclofenac than with ketoprofen and tenoxicam. Superior overall and/or GI tolerability of the drug relative to other NSAIDs has been indicated by a nonrandomised comparison with sustained release diclofenac in 10,142 patients, a meta-analysis of 13 comparisons with diclofenac, naproxen, piroxicam, indomethacin, tenoxicam or ketoprofen in 3574 patients, and preliminary details of a comparison with 10 other NSAIDs in 142,776 patients. Further analysis of the above meta-analytical data has indicated that costs incurred as a result of adverse event management are lower with aceclofenac than with a range of comparator NSAIDs. CONCLUSIONS: Trials of 2 to 6 months' duration have shown aceclofenac to be an effective agent in the management of pain and rheumatic disease. Data from in vitro studies indicate properties of particular interest with respect to cartilage matrix effects and selectivity for cyclo-oxygenase-2. Aceclofenac is well tolerated, with encouraging reports of improved general and GI tolerability relative to other NSAIDs from a meta-analysis of double-blind trials and from large nonblind studies.

Animals↗
PubMed2001

Tianeptine: a review of its use in depressive disorders.

UNLABELLED: Tianeptine is an antidepressant agent with a novel neurochemical profile. It increases serotonin (5-hydroxytryptamine; 5-HT) uptake in the brain (in contrast with most antidepressant agents) and reduces stress-induced atrophy of neuronal dendrites. Like the selective serotonin reuptake inhibitors (SSRIs) and in contrast with most tricyclic antidepressant agents, tianeptine does not appear to be associated with adverse cognitive, psychomotor, sleep, cardiovascular or bodyweight effects and has a low propensity for abuse. Tianeptine has a comparatively favourable pharmacokinetic profile. It is not subject to first-pass hepatic metabolism, has high bioavailability and limited distribution, and is rapidly eliminated. While this offers advantages for tianeptine over the tricyclic antidepressant agents in terms of dose titration, treatment changes and potential drug interactions, its rapid elimination makes adherence to dosage schedules more important. Tianeptine differs from most antidepressants in that it is not primarily metabolised by the hepatic cytochrome P450 system, indicating less likelihood of drug-drug interactions; this is of particular interest for elderly patients. Tianeptine, in dosages of 25 to 50 mg/day, has been investigated in patients with major depression, depressed bipolar disorder, dysthymia or adjustment disorder. It has equivalent antidepressant efficacy to several classical antidepressant agents (amitriptyline, clomipramine, imipramine, mianserin) and the SSRIs fluoxetine (in most patients), paroxetine and sertraline. Comparison with maprotiline indicated superior efficacy for tianeptine but dothiepin appeared superior in another study. Extended treatment with tianeptine decreases the incidence of relapse/recurrence of depression. Tianeptine appears to be as effective as fluoxetine, sertraline, amitriptyline, clomipramine and mianserin and more effective than maprotiline in improving associated anxiety in patients with depressive disorders. Depression and anxiety symptoms in alcohol dependant patients also respond well to tianeptine. The adverse effects associated with tianeptine are similar in many respects to those of the SSRIs and minimal in comparison with the tricyclic antidepressants. The most common adverse effects are nausea, constipation, abdominal pain, headache, dizziness and changes in dreaming. Anticholinergic effects occur less often with tianeptine than with tricyclic agents. Hepatoxicity is rare. The dosage should be decreased in elderly patients and those with severe renal failure, but adjustment is not necessary in patients with alcoholism or hepatic impairment, or those undergoing haemodialysis. CONCLUSIONS: The antidepressant efficacy and favourable tolerability and pharmacokinetic profiles of tianeptine in patients with depression, including those with associated anxiety, have been proven; the data indicate that it may have additional potential in specific subgroups of depressed patients such as the elderly and those with chronic alcoholism.

Aged↗
PubMed2000

Risperidone: a review of its use in the management of the behavioural and psychological symptoms of dementia.

UNLABELLED: Risperidone is a benzisoxazole derivative which has proven efficacy against the positive and negative symptoms of schizophrenia. It has more recently been investigated and shown efficacy as a treatment for the behavioural and psychological symptoms associated with dementia in the elderly. Risperidone has pharmacological properties resembling those of the atypical antipsychotic clozapine and an improved tolerability profile compared with the conventional antipsychotic haloperidol. Risperidone has antagonistic activity primarily at serotonin 5-HT2A and dopamine D2 receptors. In the first 2 large, well controlled trials of an antipsychotic agent used in the treatment of elderly patients with Alzheimer's dementia, vascular dementia or mixed dementia, risperidone 1 mg/day was at least as effective as haloperidol and superior to placebo, as assessed by the rating scales for global behaviour, aggression and psychosis. In extension phases of the 2 trials, clinical benefits were maintained for treatment periods of up to 1 year, with an incidence rate of tardive dyskinesia (2.6%) one-tenth of that seen with conventional antipsychotics. Risperidone, administered at a low dosage of 1 mg/day was associated with fewer extrapyramidal symptoms compared with haloperidol in elderly patients. Risperidone was well tolerated with no clinically relevant abnormalities in laboratory tests, vital signs or electrocardiogram results. CONCLUSION: The efficacy of risperidone has been demonstrated in the treatment of the behavioural and psychological symptoms associated with dementia in the elderly. Preliminary results from 1-year extension studies confirm the favourable efficacy and tolerability profile of risperidone 1 mg/day. Although head to head studies with other atypical antipsychotic agents are required and the long term use of the drug requires clarification, risperidone represents a generally well tolerated and effective treatment in the management of dementia-associated behavioural and psychological symptoms in the elderly.

Age Factors↗
PubMed2000

Miglitol: a review of its therapeutic potential in type 2 diabetes mellitus.

UNLABELLED: Miglitol, the first pseudomonosaccharide alpha-glucosidase inhibitor, smooths postprandial peak plasma glucose levels and thus improves glycaemic control, which is reflected in a reduced glycosylated haemoglobin (HbA1c) level. This oral antihyperglycaemic agent is indicated for the treatment of patients with type 2 diabetes mellitus. Miglitol is generally well tolerated and, unlike the sulphonylurea agents, is not associated with bodyweight gain or hypoglycaemia when administered as monotherapy. The drug is systemically absorbed but is not metabolised and is rapidly excreted via the kidneys. Clinical trials with miglitol (usually 50 or 100 mg 3 times daily) in patients with type 2 diabetes mellitus consistently demonstrated a significant improvement in glycaemic control for periods of 6 to 12 months. There were also marked reductions in postprandial serum insulin levels, although miglitol generally had no effect on fasting insulin levels. In comparative studies miglitol had similar efficacy to acarbose, but at lower therapeutic doses (50 and 100 mg 3 times daily, respectively). In addition, although sulphonylurea agents provided superior reductions in HbA1c levels, miglitol provided similar or superior reductions in fasting and postprandial plasma glucose levels. In combination with other oral antidiabetic agents or insulin, miglitol improved glycaemic control in patients in whom metabolic control was suboptimal despite dietary and pharmacological intervention. Most adverse events associated with miglitol treatment involve disturbances of the gastrointestinal tract (most common effects are flatulence, abdominal pain and diarrhoea). These symptoms are usually dose dependent, mild to moderate in severity, occur at the onset of treatment, decline with time and resolve promptly on discontinuation of the drug or with dosage adjustment. As monotherapy, miglitol is not associated with hypoglycaemia, but concomitant use with other oral antidiabetic agents may necessitate dosage adjustment of the other agents. Miglitol had no significant effects on renal, cardiovascular, respiratory or haematological parameters in long term studies. No dosage adjustments are required in elderly patients, in those with hepatic impairment or in those with mild to moderate renal insufficiency. CONCLUSIONS: In long term, well designed trials miglitol reduces fasting and postprandial plasma glucose levels, thus improving glycaemic control, which is reflected in a reduced HbA1c level in patients with type 2 diabetes mellitus. Most adverse events associated with miglitol involve disturbances of the gastrointestinal tract. This agent is a useful first-line therapy in patients with type 2 diabetes mellitus insufficiently controlled by diet alone and as second-line or as adjuvant therapy in those insufficiently controlled with diet and sulphonylurea agents. Miglitol may prove particularly beneficial in elderly patients and those with hepatic impairment or mild to moderate renal impairment, in whom other oral antidiabetic agents are contraindicated or need to be used with caution.

1-Deoxynojirimycin↗
PubMed2000

Ebastine: an update of its use in allergic disorders.

UNLABELLED: Ebastine is a second-generation antihistamine which undergoes transformation to its active metabolite, carebastine. Its antihistaminic and antiallergic effects have been demonstrated in in vitro and in vivo studies, in addition to data obtained from clinical trials. Patients with allergic rhinitis or chronic idiopathic urticaria experienced significant improvement in their symptoms with ebastine 10 or 20 mg once daily. Some studies in patients with seasonal allergic rhinitis (SAR) have indicated trends towards greater efficacy with the 20 mg than the 10 mg dose, although only 1 study has shown statistically significant benefits. In comparative trials in patients with SAR, ebastine 10 mg was as effective as most other second-generation antihistamines, including astemizole, azelastine, cetirizine, loratadine and terfenadine. Ebastine 20 mg/day was significantly superior to loratadine 10 mg/day in patients with SAR according to effects on secondary efficacy variables in comparative studies; 1 study found significantly greater changes from baseline in mean total symptom score with ebastine 20 mg (-43 vs -36% with loratadine, p = 0.045). In patients with perennial allergic rhinitis, ebastine 10 or 20 mg daily was significantly more effective than loratadine in reducing total symptom scores from baseline 1 comparative study. There have been no reports of serious adverse cardiac effects during ebastine therapy. Increases in corrected QT interval have been observed during clinical trials; however, these have not been considered clinically significant and were generally of similar magnitude to those seen with loratadine. The normal diurnal variation in QTc interval and the problems associated in correcting for changes in heart rate also complicate assessment of this issue. The incidence of adverse events during ebastine treatment is not significantly greater than that observed with placebo or other second-generation antihistamines. CONCLUSIONS: Ebastine 10 mg daily is a well tolerated and effective treatment for allergic rhinitis and chronic idiopathic urticaria. At this dosage, it is as effective as the other second-generation antihistamines against which it has been compared. Ebastine 20 mg has similar tolerability to the 10 mg dose, and trends towards greater efficacy with the higher dose have been shown in some studies. Ebastine does not appear to be associated with any significant cardiac adverse events. Ebastine is a useful treatment option for patients with allergic rhinitis or chronic idiopathic urticaria.

Animals↗
PubMed2000

Bupropion: a review of its use in the management of smoking cessation.

UNLABELLED: Sustained release bupropion (amfebutamone) is a non-nicotine agent that is indicated as an aid to smoking cessation. In 2 large well designed clinical trials, sustained release bupropion 300 mg/day (the recommended dose) for 7 or 9 weeks was associated with considerably and significantly higher smoking abstinence rates (continuous abstinence and 7-day point prevalence rates) than placebo during treatment and at follow-up at 6 and 12 months. Point prevalence rates at 12 months in 2 studies were 23.1 and 30.3% with bupropion, whereas values for placebo were 12.4 and 15.6%. Continuous abstinence rates at 12 months, available from 1 trial, were 18.4% with bupropion and 5.6% with placebo. Furthermore, bupropion was associated with significantly higher quitting rates than nicotine patch in a comparative study. Combination therapy with bupropion and nicotine patch provided slightly higher abstinence rates than bupropion alone, although differences were not statistically significant. The combination was superior to nicotine patch alone. Data from a preliminary report of long term bupropion treatment (52 weeks) showed that the drug was associated with significantly higher continuous abstinence rates than placebo only to 6 months. However, point prevalence abstinence rates were significantly higher with bupropion than placebo to 18 months. Bupropion 300 mg/day recipients reported nicotine withdrawal symptoms during treatment; however, the symptoms were significantly less severe with bupropion than placebo. Patients receiving bupropion 300 mg/day or bupropion in combination with nicotine patch for smoking cessation generally gained less bodyweight than placebo recipients. The benefits of bupropion for preventing weight gain persisted after the completion of long term, but not short term therapy. Bupropion was well tolerated in clinical trials, and the only adverse events that were significantly more common with bupropion than placebo were insomnia and dry mouth. Data published so far suggest that sustained release bupropion has a low potential for inducing seizures (seizure rate approximately 0.1% in patients with depression). CONCLUSIONS: Bupropion is an effective and well tolerated smoking cessation intervention. Further studies with long term follow-up will be useful in determining whether abstinence rates are maintained with bupropion. In addition, clarification of its efficacy in comparison with other therapies used for smoking cessation would help to establish its clinical value. The reduced potential for weight gain with bupropion and the ability to use bupropion in combination with nicotine replacement therapy make the drug a useful treatment option for smoking cessation.

Antidepressive Agents, Second-Generation↗
PubMed2000

Irbesartan: an updated review of its use in cardiovascular disorders.

Irbesartan interrupts the renin-angiotensin system via selective blockade of the angiotensin II subtype 1 receptor; the latter being responsible for the pressor related effects of angiotensin II. As treatment for mild to moderate hypertension, irbesartan 150 mg/day controlled diastolic BP in 56% of patients according to pooled data from several phase III studies and 77% of patients in a large phase IV study. in comparative trials, irbesartan was significantly more effective than losartan and valsartan as treatment for mild to moderate essential hypertension and as effective as enalapril or atenolol. Results from many studies show an additive antihypertensive effect when hydrochlorothiazide is added to irbesartan monotherapy. The drug also induces statistically significant regression of left ventricular mass in patients with hypertension and left ventricular hypertrophy, and preliminary evidence suggests it has beneficial haemodynamic effects in patients with heart failure. Irbesartan is very well tolerated, exhibiting an adverse event profile similar to that seen with placebo in comparative trials. In conclusion, although the role of irbesartan as a treatment for heart failure is little clearer than it was 2 years ago, the place of the drug in the management of hypertension is now better established. There is evidence to suggest the drug may have a role as initial therapy for hypertension, although formal recommendation in management guidelines will almost certainly not occur until long term morbidity and mortality benefits are established.

Angiotensin II↗
PubMed2000

Tropisetron: an update of its use in the prevention of chemotherapy-induced nausea and vomiting.

UNLABELLED: Tropisetron is a serotonin (5-hydroxytryptamine; 5-HT) antagonist that is primarily used in the prevention of chemotherapy-induced nausea and vomiting. Antagonism of 5-HT3 binding sites in the peripheral and central nervous system is the probable mechanism of prevention of acute nausea and vomiting. Effects on delayed nausea and vomiting are less well understood as these are probably not mediated solely by 5-HT3 receptors. Tropisetron monotherapy is effective for the control of acute, and to a lesser extent delayed, nausea and vomiting in patients receiving moderately to severely emetogenic chemotherapy. The combination of dexamethasone and tropisetron is more effective than monotherapy. Complete control of cisplatin-induced nausea and vomiting was obtained in 69 to 97% of patients receiving the combination compared with 46 to 80% receiving tropisetron monotherapy in randomised trials. There were generally no significant differences between the control of acute or delayed nausea and vomiting provided by tropisetron, ondansetron or granisetron in randomised, comparative trials. The antiemetic efficacy of tropisetron was maintained over multiple cycles of chemotherapy. Most comparative studies showed tropisetron monotherapy to be more effective than metoclopramide in controlling acute nausea and vomiting, with the exception of 1 study which showed similar efficacy. However, high dose metoclopramide plus dexamethasone provided similar control of delayed emesis to tropisetron plus dexamethasone. Tropisetron is also effective in children, including those who responded poorly to previous antiemetic treatment. Tropisetron and ondansetron generally have similar efficacies in this population. The drug enhanced patients' quality of life and was well tolerated by adults and children alike. The recommended oral and IV dosage of tropisetron is 5 mg once daily; there is no increase in efficacy with doses >5 mg. CONCLUSIONS: Tropisetron is similar to other 5-HT3 receptor antagonists for the prevention of chemotherapy-induced nausea and vomiting in both adults and children. It is suitable as first-line therapy (combined with a corticosteroid) for the prevention of acute nausea and vomiting in patients treated with moderately to severely emetogenic chemotherapeutic agents. This combination is also moderately effective in the prevention of delayed nausea and vomiting.

Animals↗
PubMed2000

Ropinirole: a review of its use in the management of Parkinson's disease.

UNLABELLED: Ropinirole, a non-ergoline dopamine agonist, has selective affinity for dopamine D2-like receptors and little or no affinity for non-dopaminergic brain receptors. Ropinirole is indicated as adjunct therapy to levodopa in patients with advanced Parkinson's disease. It is also indicated, and recent clinical trials have focused on its use, as monotherapy in patients with early Parkinson's disease. In the symptomatic treatment of early Parkinson's disease ropinirole monotherapy was significantly more effective than placebo in 2 multicentre, randomised, double-blind trials of 3 to 12 months duration as assessed by the Unified Parkinson's Disease Rating Scale (UPDRS) motor scores and Clinical Global Impression/Clinical Global Evaluation Scales. In a similarly designed 3-year comparative study with bromocriptine, ropinirole recipients showed a significant improvement in UPDRS- activities of daily living (ADL) scores; however, motor scores were similar between the 2 groups. Ropinirole and levodopa treatments were similar in efficacy as measured by UPDRS ADL scores, although ropinirole recipients showed significantly less improvement on UPDRS motor scores at the 5-year study end-point in a multicentre, randomised double-blind trial. As an adjunct therapy to levodopa in patients with more advanced Parkinson's disease, ropinirole was reported to be as effective as bromocriptine and significantly more effective than placebo. In general in the comparisons with placebo ropinirole allowed a > or =20% reduction in the concomitant dose of levodopa without compromising efficacy in a significant proportion of patients and, in some trials decreased the amount of awake time spent in the 'off' state ('off' state is defined as a gradual return to parkinsonism despite adequate medication). Ropinirole was well tolerated either as monotherapy or as an adjunct to levodopa treatment. Nausea, dizziness and somnolence were the most commonly reported adverse events and were reported at a higher incidence by patients receiving ropinirole than by those receiving placebo. In patients with early Parkinson's disease, ropinirole generally showed a similar overall tolerability profile to bromocriptine although, over a 3-year period nausea was more commonly reported with ropinirole recipients. In a 5-year study, the incidence of dyskinesia was significantly lower with ropinirole than with levodopa regardless of levodopa supplementation. Prior to the addition of supplementary levodopa 5% of ropinirole recipients had experienced dyskinesia compared with 36% of those receiving levodopa. CONCLUSIONS: In patients with early Parkinson's disease, ropinirole monotherapy was more efficacious than bromocriptine with regard to improvement in activities of daily living, and need for supplemental levodopa. Ropinirole recipients had a higher requirement for levodopa supplementation than levodopa recipients in a 5-year study, but the incidence of dyskinesia was significantly lower with ropinirole than with levodopa (markedly so in the one third of ropinirole recipients who were able to remain on monotherapy with no levodopa supplementation). Thus available data suggest that ropinirole may provide a means of treating early Parkinson's disease while minimising the risk of dyskinesia and delaying the need for supplemental levodopa in some patients. In addition, ropinirole is also efficacious in the management of more advanced Parkinson's disease in patients who are experiencing motor complications after long term levodopa use.

Aged↗
PubMed2000

Esomeprazole.

Esomeprazole, a new proton pump inhibitor, is the S-isomer of omeprazole and is the first such inhibitor to be developed as a single isomer. Esomeprazole provided better control of intragastric pH than omeprazole, lansoprazole and pantoprazole in trials conducted in patients with gastro-oesophageal reflux disease (GORD) or healthy volunteers (n = 20 to 115). In 2 large randomised, double-blind multicentre trials esomeprazole 20 and/or 40mg for 8 weeks produced higher healing rates of erosive oesophagitis and better symptom control than omeprazole 20 mg in patients with GORD. Esomeprazole 10, 20 or 40mg once daily for 6 months maintained healing versus placebo (p < 0.001) in patients with endoscopically confirmed healed erosive oesophagitis in 2 large randomised, double-blind multicentre trials. Similarly, symptom-driven on-demand use of esomeprazole effectively controlled symptoms of GORD (heartburn) for 6 months in 2 large placebo-controlled trials. Esomeprazole-based triple therapy for 7 days was as effective for eradication of Helicobacter pylori as longer omeprazole-based therapy in 2 randomised double-blind trials including about 450 patients each. Endoscopically confirmed ulcer healing 4 weeks after treatment initiation was reported in about 90% of patients with active duodenal ulcer in both treatment groups. Esomeprazole-based triple therapy for 10 days was more effective than esomeprazole plus clarithromycin for eradication of H. pylori in 233 patients.

Animals↗
PubMed2000

Raloxifene: a review of its use in postmenopausal osteoporosis.

UNLABELLED: Raloxifene is a selective estrogen receptor modulator that partially mimics the effects of estrogens in bone and the cardiovascular system, while functioning as an antiestrogen in endometrial and breast tissue. In randomised placebo-controlled studies involving postmenopausal women or patients with osteoporosis, raloxifene 60 to 150 mg/day was effective in increasing bone mineral density (BMD) over 12- to 36-month periods. At the 60 mg/day recommended dosage, increases of 1.6 to 3.4%, 0.9 to 2.3% and 1.0 to 1.6% were reported in lumbar spine, femoral neck and total hip, respectively, versus < or =0.5% with placebo. Raloxifene 60 or 120 mg/day decreased the risk of vertebral fractures over a 36-month period in postmenopausal patients with osteoporosis. Significant reductions in radiographic fracture risk versus placebo (30 and 50%) occurred regardless of whether patients had existing fractures at baseline. Although raloxifene did not affect the overall incidence of nonvertebral fractures, a reduction in the incidence of ankle fracture was reported in comparison with placebo. In postmenopausal women, raloxifene 60 mg/day significantly reduced serum levels of total and low density lipoprotein cholesterol from baseline, compared with placebo. High density lipoprotein cholesterol and triglyceride levels were unaffected. Raloxifene 60 or 120 mg/day reduced the risk of invasive breast cancer by 76% during a median of 40 months' follow-up in postmenopausal patients with osteoporosis and no history of breast cancer. A relative risk reduction of 90% was reported for estrogen-receptor positive invasive breast cancers; estrogen-receptor negative cancer risk was unaffected by raloxifene. Raloxifene was generally well tolerated in clinical trials at dosages up to 150 mg/day. Adverse events thought to be related to raloxifene treatment were hot flushes and leg cramps. Venous thromboembolism was the only serious adverse event thought to be related to raloxifene treatment and a relative risk of 3.1 compared with placebo treatment was reported in patients with osteoporosis. Vaginal bleeding occurred in < or =6.4% of raloxifene-treated women but was reported by 50 to 88% of those receiving estrogens or hormone replacement therapy (HRT). Raloxifene treatment was not associated with stimulatory effects on the endometrium. CONCLUSIONS: Raloxifene significantly increases BMD in postmenopausal women and reduces vertebral fracture risk in patients with osteoporosis. In clinical trials, raloxifene was generally well tolerated compared with placebo and HRT, although its propensity to cause hot flushes precludes use in women with vasomotor symptoms. In particular, the lack of stimulatory effects on the endometrium and the reduction in invasive breast cancer incidence indicate raloxifene as an attractive alternative to HRT for the management of postmenopausal osteonorosis.

Bone Remodeling↗
PubMed1999

Cytoplasmic proteins interact with a translational control element in the protein-coding region of proopiomelanocortin mRNA.

Previous studies have indicated that proopiomelanocortin (POMC) is translationally regulated. We proposed that the regulatory mechanism involves an interaction between trans-acting protein factors and a cis-acting stem-loop structure in the coding region of POMC mRNA. Functional interactions were tested by examining the translation of mouse POMC mRNA in a rabbit reticulocyte system. Specific binding was demonstrated with ultraviolet-crosslinking and RNA gel mobility shift assays. The evidence presented supports our hypothesis that the translational regulation of POMC gene expression involves recognition of the stem-loop by RNA-binding proteins. Furthermore, POMC stem-loop RNA-binding proteins specifically recognized a predicted stem-loop found in the coding region of corticotropin-releasing hormone, suggesting a novel mechanism of gene regulation that may extend to other neuropeptides as well.

Animals↗
PubMed1999

Insulin aspart.

Insulin aspart is a recombinant analogue of human insulin. Following subcutaneous insulin injection (0.15 to 0.2 U/kg), significantly higher serum insulin concentrations are achieved in a shorter time with insulin aspart than with human insulin. The subsequent decline in serum insulin concentrations is also more rapid with insulin aspart. In healthy individuals undergoing euglycaemic glucose clamp testing, glucose infusion rates were higher and reached maximum concentrations significantly earlier after insulin aspart than after human insulin. Interindividual variability in pharmacodynamic and pharmacokinetic parameters with insulin aspart was generally less than that with human insulin, whereas the intraindividual variability in these parameters was similar after each insulin. In patients with type 1 diabetes postprandial glucose excursions were less pronounced with insulin aspart than human insulin. Daytime glucose control was better and minimum glucose levels during the night were not as low with insulin aspart as with human insulin. In diabetic patients treated with insulin aspart there was generally a lower frequency of hypoglycaemic events than in patients treated with human insulin.

Clinical Trials as Topic↗