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Biomedical subjects

M Bo

Publications and source records attributed to M Bo.

At least 19 recordsLinked to original sources
PubMed2006

Biological treatment of industrial wastes in a photobioreactor.

An algal-bacterial consortium was tested for the treatment from a coke factory. A Chlorella vulgaris strain and a phenol-degrading Alcaligenes sp. were first isolated from the wastewater treatment plant to serve as inocula in the subsequent biodegradation tests. Batch tests were then conducted with samples from the real wastewater or using a synthetic wastewater containing 325 mg phenol/l and 500 mg NH4+/l as target pollutants. Direct biological treatment of the real wastewater was not possible due to the toxicity of organic compounds. Activated carbon adsorption and UV(A-B)-irradiation were efficient in detoxifying the effluent for subsequent biological treatment as inoculation of pretreated samples with the algal-bacterial consortium was followed by complete phenol removal and NH4+ removal of 45%. Complete phenol removal and 33% NH4+ removal were achieved during the fed-batch treatment of artificial wastewater at 6 d hydraulic retention time (HRT). Under continuous feeding at 3.6 d HRT, phenol and NH4+ removal dropped to 58 and 18%, respectively. However, complete phenol removal and 29% NH4+ removal were achieved when 8 g NaHCO3/l was added to the artificial wastewater to enhance algal growth. This study confirms the potential of solar-based industrial wastewater treatment based on solar-based UV pretreatment followed by algal-bacterial biodegradation.

Alcaligenes↗
PubMed2005

Somatopause reflects age-related changes in the neural control of GH/IGF-I axis.

This paper will focus on the hypofunction of GH/IGF-I axis in aging, as the most impressive example of decreased activity as function of age-related changes in the neural control of somatotroph cells. GH secretion undergoes clear age-related variations that are generally mirrored by IGF-I levels, the best marker of GH status. Given the well known positive influence of GH/IGF-I on body composition, structure functions and metabolism, this paper discusses the potential clinical implications, also taking into account evidence showing that, at least in animals, deficiency in GH/IGF-I is somewhat associated to prolonged life. Although somatopause is likely to contribute to age-related changes in body composition, structure functions and metabolism, we are now in front of the paradox of lifelong GH/IGF-I deficiency or resistance resulting in prolonged life expectancy and GH replacement at advanced age, probably exerting anti-aging effects. This evidence questions whether GH deficiency is or not a beneficial adaptation to aging. By answering this question one is not simply finding new phylosophical paradigm but also the rational basis for anti-aging drug interventions.

Aging↗
PubMed2004

Body fat and C-reactive protein levels in healthy non-obese men.

BACKGROUND AND AIM: The relationships between C-reactive protein (CRP) levels, adipose tissue and metabolic alterations have not been clearly established in healthy non-obese subjects. We investigated the relationships between body fat, CRP levels and metabolic variables in healthy, non-obese sons of patients affected by metabolic syndrome (MS). METHODS AND RESULTS: Age, CRP and interleukin 6 (IL-6) levels, anthropometric measures (body mass index, BMI; waist circumference and waist-to-hip ratio, WHR), total and regional fat content (as determined by means of dual X-ray absorptiometry, DXA), total and LDL cholesterol, and the metabolic variables related to MS (HDL-cholesterol, triglyceride, glucose and insulin levels; the fasting insulin resistance index, FIRI; blood pressure) were evaluated in 85 healthy non-obese sons of MS patients. Linear and multiple regression analyses were used to evaluate the relationships between body fat, metabolic variables and CRP levels, and to investigate whether the association between body fat content and metabolic variables persists after adjustment for CRP levels. Body fat was associated with all of the investigated variables. CRP levels were associated with total and regional body fat, the anthropometric index of weight, age, and with some metabolic alterations (HDL-cholesterol and triglyceride levels, systolic blood pressure, and fasting insulin and LDL-cholesterol levels). The associations between total body fat and the metabolic variables did not change after adjustment for CRP levels. Total body fat was the best predictor of CRP levels (p<0.0001). CONCLUSIONS: In healthy, non-obese sons of MS patients, total body fat is the best predictor of CRP levels, and remains closely associated with metabolic abnormalities after adjustment for CRP levels. These findings strongly support the hypothesis that body fat is the main determinant of metabolic abnormalities and a low inflammatory state, at least in healthy subjects.

Adipose Tissue↗
PubMed2001

The role of metals in autoimmune vasculitis: epidemiological and pathogenic study.

BACKGROUND: A possible relationship between Silica (Si) exposure and antineutrophil cytoplasm antibodies (ANCA)-associated vasculitis has been reported. Furthermore, tuberculosis (TBC) has been frequently described in patients with silicosis, and TBC infection shares with ANCA-associated vasculitis the formation of granulomas. Therefore, an intriguing network including Silica, Vasculitis, TBC and ANCA might be hypothesized. The aim of this work was to further investigate these correlations using both epidemiological and pathogenic approaches. METHODS: Study I--epidemiological study. A case-control study to compare the occupational histories of 31 cases of biopsy proven vasculitis (18 pauci-immune crescentic glomerulonephritis, 9 microscopic polyangitis, 4 Wegener's granulomatosis) with those of 58 age, sex and residence-matched controls (affected by other kidney diseases), was performed. Occupational Health physicians designed an appropriate questionnaire in order to evaluate a wide spread of exposures and calculate their entity by the product of Intensity x Frequency x Duration. Study II--tuberculosis association. A case-control study to evaluate the frequency of a previous history of tuberculosis (TBC) in 45 patients with vasculitis and 45 controls were performed. Study III--ANCA positivity. A case-control study to evaluate the presence of ANCA was performed by testing blood samples of 64 people with previous professional exposure and 65 sex/age matched patients hospitalized in a General Medicine Unit. Furthermore, the same evaluation was made in a pilot study in 16 patients with ongoing or previous TBC. Study IV--experimental study. The oxygen free radicals (OFR) and IL-12 production (both involved in the pathogenesis of vasculitis) from human phagocytic cells stimulated with an amorphous (diatomaceous earth) and a crystalline (quartz) form of Si at the doses of 10 and 100 microg ml(-1) was evaluated. RESULTS: Study I--a positive history of exposure to Si resulted in significantly more present in cases (14/31 = 45%) than in controls (14/58 = 24%, P = 0.04, OR = 2.4) and no other significant exposure association was found (including asbestos, mineral oil, formaldehyde, diesel and welding fumes, grain and wood dust, leather, solvents, fungicides, bitumen, lead and paint). Study II--past TBC infection was significantly more present in patients with vasculitis (12/45 = 26%) than in controls (4/45 = 8%, P < 0.05). Study III--ANCA was present in 2/64 exposed people (vs. 0/65 controls, P = NS) and 0/16 patients with TBC. Study IV--both amorphous and crystalline Si forms represented a stimulus for OFR and IL-12 production, but quartz resulted as a greater inductor. CONCLUSIONS: We conclude that Si exposure might be a risk factor for ANCA-associated vasculitis, possibly enhancing endothelial damage by phagocyte generation of oxygen free radicals and Th1 differentiation by an excessive IL-12 phagocyte production. Frequency of TBC was significantly higher in vasculitis patients. ANCA was not frequent in the preliminary examination of people with previous professional exposure or patients with TBC, but the number of samples evaluated is too small to allow conclusions.

Adult↗
PubMed2001

Treatment of heterozygous familial hypercholesterolemia: atorvastatin vs simvastatin.

BACKGROUND AND AIM: This study compares the cholesterol-lowering efficacy of atorvastatin and simvastatin in attainment of the National Cholesterol Education Program (NCEP) guidelines LDL-cholesterol (LDL-C) goal in patients with heterozygous familial hypercholesterolemia (HFH). The association of atorvastatin with significant changes of blood fibrinogen and other coagulative variables was also compared with that of simvastatin. METHODS AND RESULTS: In a 24-week study, 26 HFH patients (16 men, 10 women, mean age 55.1 +/- 11.3) were randomly assigned to receive atorvastatin or simvastatin. The initial daily dose of 10 mg was progressively raised to 20, 40 and 80 mg in patients who had not reached the NCEP LDL-C goal. Significant reductions of total and LDL-C (p < 0.001), triglycerides (p < 0.005) and apoB100 (p < 0.001) were observed in both groups. Atorvastatin caused greater reductions in total cholesterol (-42% vs -30%) (p < 0.001) and LDL-C (-50% vs -37%) (p < 0.01). Three patients treated with Atorvastatin (23%) and none of those treated with simvastatin reached the NCEP LDL-C goal at the end of the study. No significant departures from the fibrinogen and coagulative variable baselines were observed. CONCLUSIONS: Atorvastatin has greater cholesterol-lowering efficacy than simvastatin in HFH.

Anticholesteremic Agents↗
PubMed2001

[PSA/volume ratio in prostatic disease in the elderly].

Prostate Specific Antigen (PSA) is the most important marker of prostate diseases actually available. The aim of this study was to evaluate the relations between aging, PSA and prostatic volume's increase, and whether these relations justify the adoption of different normality ranges of PSA in the elderly. We considered 285 patients aged over 60 years (mean age 69.01 years), with Benign Prostatic Hyperplasia (BPH) and absence of malignant prostatic disease, prostatic phlogosis and absuntion of drugs that can influence the PSA's levels in the serum. Patients underwent PSA, digital rectal exploration and transrectal ultrasonography, with determination of the three prostatic diameters, of the prostatic volume by the ellipsoid formula and of the maximum adenoma diameter; PSA was determined in all patients and PSA free in those with total PSA > 4 ng/ml; the PSA density was calculated. We found that age does not correlate with PSA and is poorly correlated with prostatic volume (p < 0.05); on the contrary, PSA values are strongly related with prostatic volume and maximum diameter of adenoma (p < 0.01). Mean free PSA value was 16.3 +/- 5.99%, and most of patients had values in the so-called grey zone of discrimination between benignity and malignity. We conclude that in elderly patients with volume. These results suggest the possibility to consider as indicative of benignity also total PSA values between 4 and 10 ng/ml, when they are associated with a significative prostatic volume's increase and with free PSA greater than 10%.

Aged↗
PubMed2001

[Unexpected diagnosis of thorotrast-induced cirrhosis].

It is presented the clinical case of a 73 year old man admitted to hospital with dyspnea and productive cough. Clinico-instrumental investigations demonstrated monolateral pleural effusion and ascites in a severe cirrhotic chronic liver failure. After evacuation of the pleural and peritoneal effusion, chest radiography showed the presence of a double accumulation of radiopaque material in left cervical region and in left paramediastinic site. Chest and abdominal CT scan showed a systemic accumulation of this material in liver, spleen and glands. The characteristics of the iperreflecting substance accumulated were compatible with that of Thorotrast. In the mean time, a prostate cancer with skeletal metastases was diagnosed. Despite therapy, the chronic liver failure causes a rapid deterioration of clinical conditions, with irreversible hepatic coma and death.

Aged↗
PubMed2000

Docetaxel in 253 previously treated patients with progressive locally advanced or metastatic breast cancer: results of a compassionate use program in The Netherlands.

The aims of this study were to evaluate the efficacy and safety of docetaxel (Taxotere) in patients with progressive locally advanced or metastatic breast cancer, previously treated with at least one chemotherapy regimen, and the effect of the number of previous chemotherapy lines on response rate, progression-free survival and overall survival. Two-hundred and fifty-three patients from 10 hospitals in The Netherlands received docetaxel as part of a compassionate use program. The majority had received prior anthracycline-containing chemotherapy (84.2%). The recommended starting dose was 100 mg/m2 i.v. every 3 weeks. All patients received corticosteroid premedication. Two-hundred and thirty patients were evaluable for response. The overall response rates (ORR) to docetaxel when used as second-, third- or fourth-line treatment were, respectively, 40.2, 26.0 and 34.6% (p value 0.30). The median progression-free survival for this population was 4.9 months and the median overall survival of the whole group was 8.5 months, and both were not related to the number of previous chemotherapy regimens (p value, respectively, 0.71 and 0.16). The toxicity of docetaxel was manageable and neutropenia was the most frequently noted toxicity. This study confirms that docetaxel is an active cytotoxic agent in pretreated patients with progressive locally advanced or metastatic breast cancer and is still active when used as third- or fourth-line treatment.

Adult↗
PubMed1999

Cholesterol and long-term mortality after acute myocardial infarction in elderly patients.

METHOD: We investigated the association of total serum cholesterol concentrations and subsequent overall and coronary mortality in 304 patients aged > or =65 discharged from hospital after acute myocardial infarction. RESULTS: There was no association between total cholesterol concentrations and mortality due to either coronary heart disease or to all causes in all patients or, separately, in men, women, patients younger than 75 and patients aged 75 years and older.

Aged↗
PubMed1997

[Sample pretreatment method for assay of chlorogenic acid in Chinese medicinal preparations].

This paper introduces a sample pretreatment method for assaying chlorogenic acid-D101-column separation-precipitation method. The method features thorough removal of impurities, complete separation of chlorogenic acid and simple operational procedures. The experimental result of four samples from three preparations shows that this method is good in reliability and applicability.

Chlorogenic Acid↗
PubMed1997

[In-hospital mortality of elderly patients with myocardial infarct. Difference between the sexes].

The number of women who become ill and die from acute myocardial infarction (AMI) increases steadily with age. It is not yet clearly defined whether and why women suffer from a higher in-hospital mortality rate after AMI. In this study we evaluated the importance of the female sex as a risk factor for in-hospital mortality in elderly patients suffering from AMI. A retrospective study was performed in 724 patients (429 males, 295 females) aged > or = 65 years (mean age 74.9 +/- 6.3 years) consecutively admitted to San Giovanni Battista Hospital in Turin during the period 1988-1991 with validated primary discharge diagnosis of AMI. In-hospital mortality was significantly higher in females (34.6%) compared to males (25.6%, p > 0.01). After multivariate analysis female sex was not independent predictive for in-hospital death. Multivariate analysis was therefore repeated in the various sections of the history of AMI (anamnestic variables, including age and sex: physical signs on admission, ECG findings, laboratory tests, clinical progress, including complications and treatment) in order to identify the factors responsible for the higher mortality rate in women. These were found to be low hemoglobin values (< 12 g/dl) on admission, development of cardiac failure disorders and rhythm disturbances during hospitalization, and differences in therapeutic procedures. In spite of the absence of an independent unfavourable effect of female sex, elderly women with AMI have a higher in-hospital mortality rate. A more precarious state of health on admission, a peculiar susceptibility to severe complications during hospital-stay and differences in therapeutic procedures appear to be the factors responsible for this increased mortality rate in women.

Age Factors↗
PubMed1996

[Cerebral vasomotor reactivity: functional tests].

The evaluation of cerebrovascular reactivity provides quantitative and qualitative information about cerebral hemodynamics in patients with external and internal cerebrovascular disease. Cerebrovascular reactivity is defined as the capability of the intracerebral arterioles to dilate; it may be diminished or exhausted in patients with insufficiently collateralized stenoses or with occlusions of the arteries supplying the brain. Its evaluation by different tests may provide important informations about therapeutic approach.

Apnea↗
PubMed1995

[Associations between arterial hypertension and other cardiovascular risk factors in subjects over 65 years of age].

The goal of this study was to evaluate whether in subjects aged 65 or over hypertensive patients have a greater prevalence of risk factors than normotensives. 1369 subjects, aged 65 or over, have been retrospectively investigated. The following risk factors were considered: cigarette smoking, left ventricular hypertrophy, diabetes mellitus and atrial fibrillation (analyzed as dichotomous variables), B.M.I., blood concentration of total, -LDL-HDL cholesterol, triglycerides and total/HDL cholesterol ratio (analyzed as continuous variables). The mean number of risk factors was calculated in hypertensive and normotensive subjects; the association between hypertension and risk factors was evaluated using univariate and multiple logistic regression analysis. 451 subjects (32.9%) were found to be hypertensives. The average number of risk factors was significantly greater in hypertensive than in normotensive subjects (1.85 +/- 1.27 vs 1.39 +/- 1.15, p < 0.001), and, in both groups, in men than in women. Left ventricular hypertrophy (p < 0.001), total cholesterol (p < 0.001), diabetes mellitus (p < 0.001) and atrial fibrillation (p < 0.01) were found to be independently associated with the presence of hypertension. We concluded that among the elderly there is a greater prevalence of risk factors in hypertensive than in normotensive subjects and that some risk factors--left ventricular hypertrophy, atrial fibrillation, diabetes mellitus, and blood levels of atherogenic lipids--are independently associated with the presence of hypertension.

Aged↗
PubMed1995

[Expression of epidermal growth factor, transforming growth factor-alpha and epidermal growth factor receptor messenger RNA in human endometrium and endometrial carcinoma].

To study the regulation of c-erbB, EFG and TGF-alpha in endometrium, we examined the expression of their mRNA in 5 normal endometrial and 5 endometrial carcinoma tissues by Northern blot and reverse transcription-polymerase chain reaction (RT-PCR). By Northern blot with 10 micrograms of total RNA, c-erbB mRNA was not detected in the normal endometrium, but it was detected in 3 samples of endometrial carcinoma tissues. On the other hand RT-PCR identified c-erbB mRNA in all the normal endometrium and endometrial carcinoma tissues by amplifying cDNA derived from c-erbB mRNA. EGF mRNA was detected by RT-PCR in normal endometrium except in the early follicular phase. It was detected in all cases of endometrial carcinoma tissues. TGF-alpha mRNA was also detected in all the normal and endometrial carcinoma tissues by RT-PCR. Our study suggests that an autocrine/paracrine mechanism of EGF may regulate the endometrial cycle. Because some endometrial carcinoma tissues express the c-erbB mRNA much more than normal endometrium, disruption of the autocrine/paracrine mechanism may trigger subsequent endometrial carcinogenesis.

Adenocarcinoma↗