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Biomedical subjects

D J Jamieson

Publications and source records attributed to D J Jamieson.

At least 19 recordsLinked to original sources
PubMed2005

HIV-1 subtype E progression among northern Thai couples: traditional and non-traditional predictors of survival.

BACKGROUND: In the continuing effort to introduce antiretroviral therapy in resource-limited settings, there is a need to understand differences between natural history of HIV in different populations and to identify feasible clinical measures predictive of survival. METHODS: We examined predictors of survival among 836 heterosexuals who were infected with HIV subtype CRF01_AE in Thailand. RESULTS: From 1993 to 1999, 269 (49.4%) men and 65 (25.7%) women died. The median time from the estimated seroconversion to death was 7.8 years (95% confidence interval 7.0-9.1). Men and women with enrolment CD4 counts <200 cells/microl had about 2 and 11 times greater risk of death than those with CD4 counts of 200-500 and >500, respectively. Measurements available in resource-limited settings, including total lymphocyte count (TLC), anaemia, and low body mass index (BMI), also predicted survival. Men with two or more of these predictors had a median survival of 0.8 (0.5-1.8) years, compared with 2.7 (1.9-3.3) years for one predictor and 4.9 (4.1-5.2) years for no predictors. CONCLUSIONS: The time from HIV infection to death appears shorter among this Thai population than among antiretroviral naive Western populations. CD4 count and viral load (VL) were strong, independent predictors of survival. When CD4 count and VL are unavailable, individuals at high risk for shortened HIV survival may be identified by a combination of low TLC, anaemia, and low BMI. This combination of accessible clinical measures of the disease stage may be useful for medical management in resource-limited settings.

Adolescent↗
PubMed2004

Hepatitis C virus (HCV): prevalence in a gynecological urgent care clinic population.

OBJECTIVE: To determine the prevalence of hepatitis C virus (HCV) among women seeking urgent gynecological care. METHODS: Women were asked to complete a short self-assessment screening of HCV risk. Those answering yes to any of the screening questions were offered HCV testing and were asked to complete a more detailed questionnaire. RESULTS: Among the 125 women who completed the screening questionnaire, 80% (100) answered yes to one or more of the screening questions. Of the 99 women who underwent testing, six (6.1%) were HCV seropositive; a history of injection drug use was the only finding associated with HCV seropositivity (R.R 9.7: 95% CI 1.90-49.40). CONCLUSIONS: Women seeking urgent outpatient gynecological care, particularly those who are injection drug users, are at a substantial risk of HCV infection. A careful risk assessment should be completed in order to identify women who should be offered HCV testing.

Adult↗
PubMed2003

HIV-1 seroprevalence rates in women and relinquishment of infants to the state in St Petersburg, Russia, 2002.

The effectiveness of rapid HIV-1 testing and nevirapine prophylaxis for HIV-infected mothers without prenatal care has been shown. We found that from 1998 to 2002, HIV-1 seroprevalence in women giving birth in St Petersburg, Russia increased 100-fold: from 0.013% to 1.3% (p<0.0001). HIV-1 seroprevalence was 8% (114 of 1466) in women without prenatal care and 1% (376 of 37645) in those with prenatal care (p<0.0001). All 376 HIV-1-infected women with, and 41% (47 of 114) of HIV-1-infected women without prenatal care received intrapartum antiretroviral therapy (p<0.0001). In women who were HIV-1 positive, 26% (30 of 114) of those without prenatal care and 4% (13 of 371) of those with prenatal care relinquished their infants to the custody of the state, compared with 1% (354 of 37 621) of HIV-1-negative women (p<0.0001).

Anti-Retroviral Agents↗
PubMed2003

Pregnancy outcomes in foreign-born and US-born women.

OBJECTIVES: To compare pregnancy outcomes between foreign-born women and women born in the United States (US-born). METHODS: A retrospective cohort study (1991-2001) of all deliveries at Grady Memorial Hospital in Atlanta, Georgia. RESULTS: Among 49,904 deliveries, 27% were to foreign-born mothers representing 164 countries grouped into eight geographic regions. Compared with US-born women, foreign-born women had a higher mean birthweight (3315 vs. 3083 g), and a lower risk of preterm delivery (RR 0.46, 95% CI 0.43-0.49), perinatal mortality (RR 0.40, 95% CI 0.36-0.45), hypertension (RR 0.31, 95% CI 0.23-0.41), and HIV infection (RR 0.13, 95% CI 0.10-0.18). However, foreign-born women had an increased risk of diabetes (RR 1.63, 95% CI 1.48-1.79), perineal laceration (RR 1.71; 95% CI 1.66-1.76), and postpartum hemorrhage (RR 1.10; 95% CI 1.05-1.15). CONCLUSIONS: Foreign-born women have better health behaviors, pregnancy outcomes, and a lower risk of infectious diseases than US-born women, but they have a higher risk of certain medical conditions and obstetric complications.

Adolescent↗
PubMed2001

Cancer incidence in women with or at risk for HIV.

The purpose of our study was to identify the types and rates of cancers seen in high-risk human immunodeficiency virus (HIV)-infected and HIV-uninfected women. From 1993 to 1995, 1,310 women enrolled at four urban U.S. research sites in the HIV Epidemiology Research Study and were interviewed biannually to identify interval diagnoses and hospitalizations until study closure in March 2000. Cancer incidence data were collected through abstraction of medical records and death certificates. Of 871 HIV-infected and 439 HIV-uninfected women, 85% had a history of smoking and 50% a history of injection drug use. For our analysis, 4,180 person-years were contributed by HIV-infected women, and 2,308 person-years by HIV-uninfected women. HIV-infected women had 8 non-Hodgkin's lymphomas, 5 invasive cervical cancers (ICC), 1 Kaposi's sarcoma and 12 non-AIDS defining cancers, including 4 lung cancers, compared with 4 cancers in HIV-uninfected women including 1 lung cancer (all cancers, 6.22/1000 person-years vs. 1.73/1000 person-years, p = 0.01). CD4+ cell counts were above 200/mm3 in all women with ICC. HIV-infected women with lung cancer were young smokers (mean age, 40 years), and all died within 6 months of diagnosis. Lung cancer occurred at twice the rate in HIV-infected vs. uninfected women in the cohort and severalfold above expected in age- and race-matched women in U.S. national data (incidence relative risk 6.39; 95% confidence interval 3.71, 11.02; p < 10(-7)). The frequent occurrence of cervical and lung cancers have important implications for the counseling (cigarette cessation), screening (PAP smears) and care of women with HIV infection, as they live longer because of current antiretroviral therapies.

Adolescent↗
PubMed2001

Longitudinal analysis of bacterial vaginosis: findings from the HIV epidemiology research study.

OBJECTIVE: To determine the natural history of bacterial vaginosis in women with or at risk for human immunodeficiency virus (HIV). METHODS: A cohort of 854 HIV-infected women and 434 HIV-uninfected women from four US sites was followed prospectively with gynecologic exams every 6 months over a 5-year period. The prevalence, incidence, persistence, and severity of bacterial vaginosis, which was defined using a Gram-staining scoring system, were calculated using generalized estimating equation methods. RESULTS: In adjusted analyses, HIV-infected women had a higher prevalence of bacterial vaginosis than HIV-uninfected women (adjusted odds ratio [OR] 1.29; 95% confidence interval [CI] 1.08, 1.55). Although HIV-infected women were not more likely to have incident infections, they were more likely to have persistence of their infections (adjusted OR 1.49; 95% CI 1.18, 1.89). Similarly, immunocompromised women (CD4+ cell count less than 200 cells/microL) were more likely than HIV-infected women with higher CD4+ cell counts (more than 500 cells/microL) to have prevalent (adjusted OR 1.29; 95% CI 1.03, 1.60) and persistent (adjusted OR 1.38; 95% CI 1.01, 1.91) bacterial vaginosis infections, but not more likely to have incident infections. Immunocompromised women had more severe bacterial vaginosis by both clinical criteria (adjusted OR 1.40; 95% CI 1.08, 1.82) and by Gram-staining criteria (adjusted OR 1.50; 95% CI 1.12, 2.00). CONCLUSIONS: Bacterial vaginosis is more prevalent and persistent among HIV-infected women, particularly among those who are immunocompromised. Immunocompromised women are more likely than HIV-infected women with higher CD4+ cell counts to have severe bacterial vaginosis.

AIDS-Related Opportunistic Infections↗
PubMed2001

A multicenter study of bacterial vaginosis in women with or at risk for human immunodeficiency virus infection.

BACKGROUND: Bacterial vaginosis is a common gynecologic infection that has been associated with a variety of gynecologic and obstetric complications, including pelvic inflammatory disease, postabortal infection and premature delivery. Recent studies suggest that bacterial vaginosis may increase a woman's risk for human immunodeficiency virus (HIV). We undertook this study to assess whether the prevalence and characteristics of bacterial vaginosis differed according to HIV status in high-risk US women. METHODS: Prevalence of bacterial vaginosis was assessed by Gram's stain and clinical criteria for 854 HIV-infected and 434 HIV-uninfected women enrolled in the HIV Epidemiology Research (HER) Study. Multiple logistic regression techniques were used to determine whether HIV infection independently predicted bacterial vaginosis. RESULTS: Almost half (46%) the women had bacterial vaginosis by Gram's stain. The prevalence of bacterial vaginosis was 47% in the HIV-positive women compared with 44% in the HIV-negative women; this difference was not statistically significant (p = 0.36). After adjustment for other covariates, HIV-positive women were more likely than HIV-negative women to have bacterial vaginosis (odds ratio (OR) 1.31; 95% confidence interval (CI) 1.01-1.70) by Gram's stain but not by clinical criteria (OR 1.16; CI 0.87-1.55). Among HIV-positive women, use of antiretroviral drugs was associated with a lower prevalence of bacterial vaginosis (adjusted OR 0.54; Cl 0.38-0.77). CONCLUSIONS: In this cross-sectional analysis of high-risk US women, HIV infection was positively correlated with bacterial vaginosis diagnosed by Gram's stain.

AIDS-Related Opportunistic Infections↗
PubMed2000

Cadmium-inducible expression of the yeast GSH1 gene requires a functional sulfur-amino acid regulatory network.

Glutathione (gamma-l-glutamyl-l-cysteinylglycine) is an important antioxidant molecule, helping to buffer the cell against free radicals and toxic electrophiles. Expression of the yeast GSH1 gene, encoding the first enzyme involved in glutathione biosynthesis, gamma-glutamylcysteine synthetase, is regulated by oxidants and the heavy metal cadmium at the level of transcription. We present evidence that the transcription factors involved in controlling the network of sulfur amino acid metabolism genes are also responsible for regulating GSH1 expression in response to cadmium. In particular the transcription factors Met-4, Met-31, and Met-32 are essential for cadmium-mediated regulation of gene expression, whereas the DNA-binding protein Cbf1 appears to play a negative role in controlling GSH1 expression.

Base Sequence↗
PubMed2000

An evaluation of poor pregnancy outcomes among Burundian refugees in Tanzania.

CONTEXT: Little is known about pregnancy outcomes among the approximately 11 million refugees worldwide, 25% of whom are women of reproductive age. OBJECTIVE: To estimate incidence of and determine risk factors for poor pregnancy outcomes and to calculate the contribution of mortality from neonatal and maternal deaths to overall mortality in a refugee camp. DESIGN: Cross-sectional review of records and survey, conducted in February and March 1998. SETTING: Mtendeli refugee camp, Tanzania. PARTICIPANTS: For the overall assessment, 664 Burundi women who had a pregnancy outcome during a recent 5-month period (September 1, 1997-January 31, 1998) and their 679 infants; 538 women (81%) completed the survey. MAIN OUTCOME MEASURES: Incidence of fetal death (fetus born > or =500 g or > or =22 weeks' gestation with no signs of life), low birth weight (<2500 g), neonatal death (death <28 days of life), and maternal death (deaths during or within 42 days of pregnancy from any cause related to or aggravated by the pregnancy or its management). RESULTS: The fetal death rate was 45.6 per 1000 births, the neonatal mortality rate was 29.3 per 1000 live births, and 22.4% of all live births were low birth weight. Compared with women without poor pregnancy outcome, those with poor pregnancy outcome were more likely to report prior high socioeconomic status (adjusted odds ratio [OR], 1.6; 95% confidence interval [CI], 1.1-2.4), having a first or second pregnancy (OR, 2.2; 95% CI, 1.4-3.4), and having 3 or more episodes of malaria during pregnancy (OR, 2.0; 95% CI, 1.4-3.1). Neonatal and maternal deaths accounted for 16% of all deaths during the period studied. CONCLUSIONS: Poor pregnancy outcomes were common in this refugee setting, and neonatal and maternal deaths, 2 important components of reproductive health-related deaths, contributed substantially to overall mortality.

Adult↗
PubMed2000

Risk factors for a complicated clinical course among women hospitalized with pelvic inflammatory disease.

The aim of this study was to identify factors ascertainable at initial presentation that predict a complicated clinical course in HIV-negative women hospitalized with pelvic inflammatory disease (PID). We used data from a cross-sectional study of women admitted for clinically diagnosed PID to a public hospital in New York City. A complicated clinical course was defined as undergoing surgery, being readmitted for PID, or having a prolonged hospital stay (> or = 14 days) but no surgery. Logistic regression was used to identify independent predictors of complications. In adjusted analyses, older age (> or = 35 years) was a risk factor for prolonged hospital stay (adjusted odds ratio [OR] = 3.9; 95% confidence interval [CI] = 1.3-11.6) and surgery (OR = 10.4; CI = 2.5-44.1); self-reported drug use was a risk factor for readmission for PID (OR = 7.7; CI = 1.4-41.1) and surgery (OR = 6.2; CI = 1.8-20.5). Older age and self-reported drug use appear to be independent risk factors for a complicated clinical course among women hospitalized with PID.

Adolescent↗
PubMed2000

Complications of interval laparoscopic tubal sterilization: findings from the United States Collaborative Review of Sterilization.

OBJECTIVE: To estimate the risk of intraoperative or postoperative complications for interval laparoscopic tubal sterilizations. METHODS: We used a prospective, multicenter cohort study of 9475 women who had interval laparoscopic tubal sterilization to calculate the rates of intraoperative or postoperative complications. The relative safety of various methods was assessed by calculating overall complication rates for each major method of tubal occlusion. Method-related complication rates also were calculated and included only complications attributable to a method of occlusion. We used logistic regression to identify independent predictors of one or more complications. RESULTS: When we used a more restrictive definition of unintended major surgery, the overall rate of complications went from 1.6 to 0.9 per 100 procedures. There was one life-threatening event and there were no deaths. Complications rates for each of the four major methods of tubal occlusion ranged from 1.17 to 1.95, with no significant differences between them. When complication rates were calculated, the spring clip method had the lowest method-related complication rate (0.47 per 100 procedures), although it was not significantly different from the others. In adjusted analysis, diabetes mellitus (adjusted odds ratio [OR] 4.5; 95% confidence interval [CI] 2.3, 8.8), general anesthesia (OR 3.2; CI 1.6, 6.6), previous abdominal or pelvic surgery (OR 2.0; CI 1.4, 2.9), and obesity (OR 1.7; CI 1.2, 2.6) were independent predictors of one or more complications. CONCLUSION: Interval laparoscopic sterilization generally is a safe procedure; serious morbidity is rare.

Adolescent↗
PubMed1999

Kinetic properties of human dopamine sulfotransferase (SULT1A3) expressed in prokaryotic and eukaryotic systems: comparison with the recombinant enzyme purified from Escherichia coli.

Sulfation, catalyzed by members of the sulfotransferase enzyme family, is a major metabolic pathway which modulates the biological activity of numerous endogenous and xenobiotic chemicals. A number of these enzymes have been expressed in prokaryotic and eukaryotic systems to produce protein for biochemical and physical characterization. However, the effective use of heterologous expression systems to produce recombinant enzymes for such purposes depends upon the expressed protein faithfully representing the "native" protein. For human sulfotransferases, little attention has been paid to this despite the widespread use of recombinant enzymes. Here we have validated a number of heterologous expression systems for producing the human dopamine-metabolizing sulfotransferase SULT1A3, including Escherichia coli, Saccharomyces cerevisiae, COS-7, and V79 cells, by comparison of Km values of the recombinant enzyme in cell extracts with enzyme present in human platelets and with recombinant enzyme purified to homogeneity following E. coli expression. This is the first report of heterologous expression of a cytosolic sulfotransferase in yeast. Expression of SULT1A3 was achieved in all cell types, and the Km for dopamine under the conditions applied was approximately 1 microM in all heterologous systems studied, which compared favorably with the value determined with human platelets. We also determined the subunit and native molecular weights of the purified recombinant enzyme by SDS-PAGE, electrospray ionization mass spectrometry, dynamic light scattering, and sedimentation analysis. The enzyme purified following expression in E. coli existed as a homodimer with Mr approximately 68,000 as determined by light scattering and sedimentation analysis. Mass spectrometry revealed two species with experimentally determined masses of 34,272 and 34,348 which correspond to the native protein with either one or two 2-mercaptoethanol adducts. We conclude that the enzyme expressed in prokaryotic and eukaryotic heterologous systems, and also purified from E. coli, equates to that which is found in human tissue preparations.

Amino Acid Sequence↗
PubMed1998

Oxidative stress responses of the yeast Saccharomyces cerevisiae.

All aerobically growing organisms suffer exposure to oxidative stress, caused by partially reduced forms of molecular oxygen, known as reactive oxygen species (ROS). These are highly reactive and capable of damaging cellular constituents such as DNA, lipids and proteins. Consequently, cells from many different organisms have evolved mechanisms to protect their components against ROS. This review concentrates on the oxidant defence systems of the budding yeast Saccharomyces cerevisiae, which appears to have a number of inducible adaptive stress responses to oxidants, such as H2O2, superoxide anion and lipid peroxidation products. The oxidative stress responses appear to be regulated, at least in part, at the level of transcription and there is considerable overlap between them and many diverse stress responses, allowing the yeast cell to integrate its response towards environmental stress.

Gene Expression Regulation, Fungal↗
PubMed1997

The prohibitin family of mitochondrial proteins regulate replicative lifespan.

Cellular senescence is determined by multiple factors, including the genetic regulation of metabolism and responses to endogenous and exogenous stresses [1-4]. Recent studies implicate a limited number of gene products in elongating lifespan in yeast and Caenorhabditis elegans [2-4]; these include the C, elegans gene cik-1, a central regulator of metabolism [5], and yeast RAS2, which controls the response to ultraviolet irradiation and other stresses [3]. Another gene postulated to effect senescence is PHB1, the yeast homologue of prohibitin [3], a rodent gene initially identified as a potential regulator of growth arrest and tumour suppressor [6-8]. Highly conserved prohibitin homologues have been identified in mammals [9], Drosophila [10], C. elegans [9], plants [11] and yeast. A second mammalian gene, encoding BAP37, a protein with sequence similarity to prohibitin, is thought to be involved in lymphocyte function [9]. Here, we show that the nuclear-encoded mammalian prohibitin and BAP37 proteins are present in mitochondria, are co-expressed, and interact physically with each other. Deletion of the Saccharomyces cerevisiae homologues, PHB1 and PHB2, results in a decreased replicative lifespan and a defect in mitochondrial membrane potential. Our observations highlight the relationship between the metabolic efficiency of cells and the ageing process, and provide evidence for its evolutionary conservation.

Amino Acid Sequence↗
PubMed1997

The association of sexual abuse with pelvic pain complaints in a primary care population.

OBJECTIVE: Our purpose was to determine the prevalence of sexual abuse during childhood and adulthood and its association with pelvic and other pain complaints in a population of reproductive-aged women. STUDY DESIGN: A 10-page questionnaire was administered to 581 nonpregnant women aged 18 to 45 years examined in primary care offices. RESULTS: The reported incidences of childhood and adult sexual abuse were 26% and 28%. In regression analyses, with the exception of irritable bowel syndrome, women with only a history of childhood sexual abuse and no abuse later in life are not more likely than nonabused women to report pain syndromes. By contrast, with the exception of dysmenorrhea, all pain complaints studied were more common in women reporting abuse both as children and as adults. CONCLUSIONS: Sexual abuse that occurs during childhood and again as an adult is strongly associated with pelvic pain complaints.

Adolescent↗
PubMed1997

Amino acid-dependent regulation of the Saccharomyces cerevisiae GSH1 gene by hydrogen peroxide.

The tripeptide gamma-L-glutamyl-L-cysteinylglycine (glutathione) is one of the major antioxidant molecules of cells and plays a vital role in buffering the cell against reactive oxygen species and toxic electrophiles. In the yeast Saccharomyces cerevisiae, the first enzyme involved in glutathione biosynthesis, gamma-glutamylcysteine synthetase, is encoded by the GSH1 gene. This study shows that the regulation of the yeast GSH1 gene by oxidants and the heavy metal cadmium is at the level of transcription. We also demonstrate that the regulation of the GSH1 gene by H2O2 depends upon the presence of the amino acids glutamate, glutamine and lysine in the media. Moreover, regulation of the GSH1 gene by H2O2, although requiring the Yap1 protein, appears to be mediated by a mechanism distinct from that which regulates the Yap1-dependent induction of genes encoding thioredoxin (TRX2) and a stress-inducible HSP70 (SSA1) by H2O2.

Amino Acids↗