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Biomedical subjects

P Olsson

Publications and source records attributed to P Olsson.

At least 19 recordsLinked to original sources
PubMed2003

Living with asthma in Sweden--the ALMA study.

BACKGROUND: Recently performed studies have found a number of limitations in the daily lives of asthmatics, and a large disparity between the perception of the sufferers and what health care professionals believe matters to asthmatics. AIM: What matters to Swedish asthma patients, what medicines do they use, and are they compliant with given prescriptions? A further aim was to compare perceptions about asthma and asthma management in asthmatics and among Swedish general practitioners (GP). DESIGN: A structured telephone interview of a representative sample of Swedish asthmatics, and a mailed questionnaire survey among GPs from different parts of Sweden. METHODS: Screening by telephone of a random sample of 10,350 subjects aged 18-45. Of those, 240 were subsequently selected for a detailed structured telephone interview about their asthma. A mailed structured questionnaire containing similar questions to those asked of the asthmatics was sent to 600 GPs, and 139 returned completed answers. RESULTS: 16% of the asthmatics reported (asthma) symptoms occurring every day during the previous month. Nocturnal symptoms at least twice per week were reported by 19%. Both these were reported by considerably higher proportions of the asthmatics than the GPs had expected. A large majority classified their disease as mild or very mild, although great majority reported frequent symptoms. Activities or situations which caused symptoms of asthma often or "now and then" were physical exertion, 67%; bad weather, 59%; contact with animals/pets, 58%; and visits to cafes or restaurants, 36%; and several asthmatics avoided these activities due to their asthma. CONCLUSION: A great majority of asthmatics report a large number of symptoms and limitations in their daily living in proportions which were roughly expected by the GPs.

Activities of Daily Living↗
PubMed2003

Budesonide/formoterol adjustable maintenance dosing reduces asthma exacerbations versus fixed dosing.

A guided, adjustable-dosing regimen with budesonide/formoterol was investigated in asthma patients. In a randomised, open, multicentre study, 1034 patients received budesonide/ formoterol (Symbicort, Turbuhaler,) 80/4.5 microg or 160/4.5 microg (depending on pre-study inhaled corticosteroid dose) two inhalations twice daily for four weeks, followed by adjustable or fixed maintenance dosing for six months. Patients receiving adjustable dosing stepped down to one inhalation twice daily if symptoms were controlled and could, if symptoms worsened, step up to four inhalations twice daily for one or two weeks according to a self-guided management plan. The primary efficacy variable was occurrence of exacerbations. Compared with fixed dosing, adjustable dosing was associated with fewer patients experiencing exacerbations (6.2% vs 9.5%, NNT 30, p<0.05), fewer daily inhalations of budesonide/formoterol (2.35 vs 3.95, p<0.001), lower costs (six-month saving Euros 98, p<0.001) and was similarly well tolerated. Adjustable maintenance dosing with budesonide/formoterol provides more effective asthma control than fixed dosing, and reduces costs.

Administration, Inhalation↗
PubMed2001

GDEP, a new gene differentially expressed in normal prostate and prostate cancer.

BACKGROUND: The database of human expressed sequence tags (dbEST) is a potential source for the identification of tissue specific genes. The database contains sequences that originate from cDNA libraries from different tissues cell types and tumors. METHODS: Computer based analysis identified a cluster of sequence homologous ESTs, containing ESTs derived only from human prostate cDNA libraries. The tissue specificity was examined by multiple tissue RNA dot blots and RT-PCR. The new RNA transcript was characterized using northern blot analysis, RACE-PCR, and a ribonuclease protection assay. RESULTS: We have identified a gene differentially expressed in prostate using EST database analysis and experimental studies. We name the gene GDEP for gene differentially expressed in prostate. The major GDEP transcript is about 520 bp long. GDEP RNA was detected in nine prostate tissue samples, four normal and five cancer. Expression in prostate epithelial cells was established by in situ hybridization. Weak expression was detected in the prostate cancer cell line LNCaP. In vitro transcription/translation indicate that the RNA encodes a small 34 amino acid protein. The major transcript consists of two exons with one large intron (> 15 kb). The GDEP gene was mapped to chromosome 4q21.1 by radiation hybrid mapping. CONCLUSIONS: Our data proves that tissue specific genes can be identified by EST database mining. The prostate specificity of GDEP expression indicates that GDEP may be useful in the diagnosis or treatment of prostate cancer. Published 2001 Wiley-Liss, Inc.

Amino Acid Sequence↗
PubMed2001

Disorder driven melting of the vortex line lattice.

The 3D XY model with random in-plane couplings is simulated to model the phase diagram of a disordered type II superconductor as a function of temperature T and randomness strength p for fixed applied magnetic field. As p increases to a critical p(c), the first order vortex lattice melting line turns parallel to the T axis, continuing down to low temperatures, rather than ending at a critical point. Above p(c) preliminary results suggest the absence of a phase coherent vortex glass.

Journal Article↗
PubMed2001

PRAC: A novel small nuclear protein that is specifically expressed in human prostate and colon.

BACKGROUND: The database of human Expressed Sequence Tags (dbEST) provides a potential source for identification of tissue-specific genes. This database contains sequences that originate from cDNA libraries from particular tumors, organs or cell types. In this report, we have used the EST database to identify PRAC, a novel gene specifically expressed in human Prostate, prostate cancer, Rectum And distal Colon. METHODS: Using a computer based analysis, a cluster of sequence homologous ESTs was identified which contained ESTs derived only from human prostate cDNA libraries. The tissue specificity was examined by multiple tissue RNA dot blots and RT-PCR. The PRAC transcript and protein was identified using Northern blot analysis, RACE-PCR, primer extension, and western blot. RESULTS: PRAC encode a 382 nucleotide RNA found in prostate, rectum, distal colon, and in three prostate cancer cell lines; LNCaP, PC-3 and DU145. This transcript encodes a 6 kDa nuclear protein. The PRAC gene is located on chromosome 17 at position 17q21, about 4 kbp downstream from the homeodomain Hoxb-13 gene. CONCLUSIONS: Our data proves that the EST database can be a useful tool for discovery of prostate-specific genes. The nuclear localization, identification of potential phosphorylation sites, and possible cotranscription with the Hoxb-13 gene suggest that PRAC may have a regulatory role in the nucleus.

Amino Acid Sequence↗
PubMed2001

ERGL, a novel gene related to ERGIC-53 that is highly expressed in normal and neoplastic prostate and several other tissues.

We have identified a new gene, that is highly expressed in normal and neoplastic prostate, and is also expressed in cardiac atrium, salivary gland, spleen and selective cells in the CNS. Database analyses of ESTs indicated prostate specificity but experimental results showed the expression in other tissues. The full length transcript is 1800 bp with an open reading frame of 526 aa. The amino-terminal 230 residues of the expressed protein has high homology to a family of lectins, especially to the sugar binding domain of ERGIC-53. We therefore designate the new gene ERGL (ERGIC-53-like). There is a transmembrane domain at amino acid positions 468-482 suggesting that the product of ERGL is a type-I membrane protein. In prostate there are two fully processed transcripts one of which is a splice variant with a deletion in the region of the transmembrane domain of the protein.

Amino Acid Sequence↗
PubMed2001

Phase fluctuations and the pseudogap in YBa(2)Cu(3)O (x).

The thermodynamics of the superconducting transition is studied as a function of doping using high-resolution expansivity data of YBa(2)Cu(3)O (x) single crystals and Monte Carlo simulations of the anisotropic 3D- XY model. We directly show that T(c) of underdoped YBa(2)Cu(3)O (x) is strongly suppressed from its mean-field value (T(MF)(c)) by phase fluctuations of the superconducting order parameter. For overdoped YBa(2)Cu(3)O (x) fluctuation effects are greatly reduced and T(c) approximately T(MF)(c). We find that T(MF)(c) exhibits a similar doping dependence as the pseudogap energy, naturally suggesting that the pseudogap arises from phase-incoherent Cooper pairing.

Journal Article↗
PubMed2001

Cytokines influence mRNA expression of cytochrome P450 3A4 and MDRI in intestinal cells.

Inflammation and infection may have the potential to increase the bioavailability of drugs. This effect could be because of a reduced metabolism of xenobiotics in the liver and/or the intestines, or because of alterations in small intestinal permeability, mucosal flow, and expression of drug efflux transporters such as P-glycoprotein (Pgp). To assess the impact on intestinal epithelium of some proinflammatory cytokines and macrophages on permeability and mRNA expression of CYP3A4 and MDRI (multidrug resistance, coding for Pgp), we used the Caco-2 cell line as a model. Exposure to proinflammatory cytokines and macrophages decreased the mRNA expression of CYP3A4 and increased the expression of MDR1 mRNA in the Caco-2 cells. In parallel, the cell layer permeability, as measured by sodium fluorescein flux, increased for all cytokine and macrophage treatments, whereas the effect on transepithelial electrical resistance (TEER) varied. Our findings suggest that inflammation and infection trigger several different cellular responses that may affect drug bioavailability; that is hampered CYP3A4 expression, increased permeability of the epithelial cell layer, and enhanced Pgp-mediated counteractive transport.

ATP Binding Cassette Transporter, Subfamily B, Mem↗
PubMed2001

Patterns in midwives' and expectant/new parents' ways of relating to each other in ante- and postnatal consultations.

Patterns in midwives' and expectant/new parents' ways of relating to each other in ante- and postnatal midwifery consultations were described by means of qualitative content analysis of 58 video-recorded consultations in a Swedish primary care setting. The midwives appeared to steer the consultations by adopting a basic pattern and occasionally including other patterns. Of the five patterns disclosed, three were revealed as basic and named 'the respectful gardener and her developing plants', 'the propagandist teacher and her ignorant pupils' and 'the steering inspector and the representatives of the population at disposal'. The midwives related in individually oriented ways in the first pattern while the latter two indicated generalized ways of relating. The expectant/new mothers were more active in the two additional patterns 'the mediating counsellor and the discreet seekers of guidance' and 'the personal women-friends'. The expectant/new fathers mostly had a minor role, only appearingly actively involved within the 'gardener' pattern. Midwives need to reflect over their ways of relating as these influence how expectant/new parents deal with the information given and their satisfaction with the care.

Female↗
PubMed2000

Involvement of differential metallothionein expression in free radical sensitivity of RTG-2 and CHSE-214 cells.

The role of metallothionein (MT) in free radical regulation and scavenging was investigated using two fish cell lines, the rainbow trout gonadal (RTG-2) cell line and the chinook salmon embryonic (CHSE-214) cell line. Exposure of RTG-2 cells to H(2)O(2) resulted in upregulation of both MT mRNA and MT protein and was also demonstrated by immunocytochemistry, confirming that MT was regulated by free radicals. We then compared the H(2)O(2) resistance in RTG-2 and CHSE-214 cells following metal treatment with Zn or Cd to induce MT. Comparison of survival of control cells and metal-exposed cells showed that metal treatment, which induced MT, significantly raised the H(2)O(2) tolerance in a dose-dependent manner in RTG-2 cells, while no increased H(2)O(2) resistance was observed in CHSE-214 cells. Transient over-expression of MT in CHSE-214: 59 cells also resulted in a dose-dependent increase in resistance to H(2)O(2) exposure. The raised resistance against H(2)O(2) in metal treated RTG-2 cells as well as transfected CHSE-214: 59 cells strongly demonstrate that MT is involved in the protection against H(2)O(2) and suggest a physiologically important function for MT when cells or whole organisms are exposed to oxidative stress.

Animals↗
PubMed2000

Kinetics of the coupled reaction catalysed by a fusion protein of yeast mitochondrial malate dehydrogenase and citrate synthase.

The mechanistic implications of the kinetic behaviour of a fusion protein of mitochondrial malate dehydrogenase and citrate synthase have been reanalysed in view of predictions based on experimentally determined kinetic parameter values for the dehydrogenase and synthase activities of the protein. The results show that the time-course of citrate formation from malate in the coupled reaction catalysed by the fusion protein can be most satisfactorily accounted for in terms of a free-diffusion mechanism when consideration is taken to the inhibitory effects of NADH and oxaloacetate on the malate dehydrogenase activity. The effect of aspartate aminotransferase on the coupled reaction is likewise fully consistent with that expected for a free-diffusion mechanism. It is concluded that no tenable kinetic evidence is available to support the proposal that the fusion protein catalyses citrate formation from malate by a mechanism involving channelling of the intermediate oxaloacetate.

Citrate (si)-Synthase↗
PubMed2000

A qualitative study of childbirth as spoken about in midwives' ante- and postnatal consultations.

OBJECTIVE: To describe conversational topics concerning childbirth and illuminate the meanings of childbirth within the discourse of ante- and postnatal midwifery consultations. DESIGN: Video-recordings of midwives' consecutive encounters with women/couples, from early pregnancy until after birth. The encounters were analysed using content analysis and a phenomenological hermeneutic approach. SETTING: Swedish midwifery clinics at primary health care centres. PARTICIPANTS: Five midwives, five women and three men. FINDINGS: Bio-medical aspects of childbirth were given much importance in the consultations relative to the activities and lived experiences of the women and their partners. Two main features of the meanings of childbirth were found in the consultations; one in which childbirth was understood as a spontaneous and risky process needing to be controlled and to which the woman had to adapt; the other was characterised by being woman centred, pointing to her power and abilities in a process during which she is cared for and which leads to a satisfying result. KEY CONCLUSIONS AND IMPLICATIONS FOR PRACTICE: A mechanistic and medicalised understanding of childbirth seems to dominate this discourse but the 'natural childbirth perspective' also appears. This study could serve as a basis for reflection on the content and meanings of childbirth in ante- and postnatal midwifery care.

Adult↗
PubMed1999

On the control of the plasma contact activation system on human endothelium: comparisons with heparin surface.

The endothelial lining in segments of the human saphenous vein harvested before and shortly after systemic heparinization of patients was investigated with regard to the ability to inhibit activated FXII. Comparisons were made with a surface modified by endpoint attached heparin, which, like the endothelium, is negatively charged and exposes the specific antithrombin binding sequence and also binds FXII and antithrombin. The heparin surface preincubated with plasma or blood and endothelium in vivo having been exposed to non-heparinzed blood and expressed similar amounts of FXII but no FXIIa. On both surfaces activation of bound FXII with ellagic acid resulted in consumption of the proenzyme and in inhibition of formed FXIIa. On both heparin surface and the endothelium consumption of antithrombin occurred concomitantly, demonstrating the importance of this inhibitor in the control of contact activation system. On the endothelium, in vivo or ex vivo, exposed to heparinized blood, most FXII was present in the active form and only incubation with purified antithrombin could restore the FXIIa inhibitory capacity. It is suggested that antithrombin bound by the specific antithrombin binding sequence of endothelial heparan sulphate, like antithrombin bound to the specific antithrombin binding sequence on heparin surface, inhibits alpha-FXIIa. This makes the endothelium consonant with the plasma contact activation system. It is suggested that systemic heparinzation of patients may both activate endothelial bound FXII and interfere in the inhibition of formed FXIIa by depriving the endothelium of required amounts of antithrombin.

Anticoagulants↗