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Pathogen research abs 1 || Pathogen research abs 2 || Pathogen research abs 3 || Pathogen research abs 4 || Pathogen research abs 5 || Hormone and endocrine research abs 1 || Hormone and endocrine research abs 2 || Hormone and endocrine research abs 3 || Hormone and endocrine research abs 4 || Hormone and endocrine research abs 5

Ann Epidemiol. 2003 May;13(5):335-43.
Serum 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) levels and thyroid function in Air Force veterans of the Vietnam War.

Pavuk M, Schecter AJ, Akhtar FZ, Michalek JE.

The University of Texas at Houston School of Public Health in Dallas, Dallas, TX 95390, USA.

PURPOSE: We assessed potential health effects of 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) concentration in serum on thyroid function in US Air Force veterans involved in Operation Ranch Hand, the unit responsible for the aerial spraying of herbicides, including TCDD-contaminated Agent Orange, during the Vietnam War from 1962 to 1971. Other Air Force veterans who were not involved with spraying herbicides were included as Comparisons. METHODS: We analyzed thyroxine (total T4), thyroid stimulating hormone (TSH), triiodothyronin percent uptake (T3% uptake), the free thyroxine index (FTI), and thyroid diseases against serum TCDD levels. Data was available for 1,009 Ranch Hand and 1,429 Comparison veterans compliant to any of five examinations in 1982, 1985, 1987, 1992, and 1997. Each veteran was assigned to one of four exposure categories based on serum TCDD levels, named Comparison, Ranch Hand Background, Ranch Hand Low Elevated, and Ranch Hand High Elevated. RESULTS: Cross-sectional analyses found statistically significantly increased TSH means at the 1985 and 1987 examinations in the High category and a significant increasing trend across the three Ranch Hand TCDD categories in 1982, 1985, 1987 and 1992. A repeated-measures analysis found significantly increased TSH means in the High TCDD category. We found no significant relation between the occurrence of thyroid disease and TCDD category. CONCLUSIONS: These findings suggest that TCDD affects thyroid hormone metabolism and function in Ranch Hand veterans. Further follow-up will be necessary to understand the relation, if any, between thyroid disease and TCDD levels.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12821272&dopt=Abstract [PubMed - in process]

Comput Biol Chem. 2003 May;27(2):103-14.
Ab initio modelling of the N-terminal domain of the secretin receptors.

Taylor WR, Munro RE, Petersen K, Bywater RP.

Division of Mathematical Biology, National Institute for Medical Research, The Ridgeway, Mill Hill, NW7 1AA, London, UK.

G protein coupled receptors of the secretin family are activated by peptide hormones of about 30 residues in length. There is considerable sequence homology within both the hormone and receptor families. The receptors possess in addition to the integral membrane domain a characteristic extracellular domain of about 120 residues in length, having conserved cysteine residues, which are involved in disulphide bridge formation, and tryptophanes, which have been shown to be critical for hormone binding. This extracellular domain does not have detectable homology to any known protein fold. In order to be able to propose a structure for this domain we have used ab initio prediction methods combined with constraints based on experimental results for the disulphide connectivity. The results of computational tools for predicting secondary structure and accessibility, together with ligand binding and mutational data and other structural considerations were used in the ab initio protein folding programs DRAGON and GADGET and also the simpler program RAMBLE, which was able to explore different permutations of disulphide bond connectivity, tryptophan side chain orientation and chain topology. The methods generated a limited number of plausible models but no single unique solution was found under the constraints. One of these was refined into a full atomic model that contained a possible peptide binding site comprising the most conserved residues.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12821307&dopt=Abstract

Gynecol Oncol. 2003 Jul;90(1):170-6.
Low-grade endometrial stromal sarcoma: hormonal aspects.

Chu MC, Mor G, Lim C, Zheng W, Parkash V, Schwartz PE.

Department of Obstetrics and Gynecology, Yale University School of Medicine, New Haven, CT 06520, USA.

OBJECTIVE: The goal of this work was to determine whether exposure to estrogen following treatment of low-grade endometrial stromal sarcomas affects clinical outcome. METHODS: Twenty-two patients with low-grade endometrial stromal sarcomas were reviewed to determine whether they were exposed to exogenous or endogenous estrogen and/or progestins following their diagnosis and whether exposure to these hormones might have influenced their prognosis. Estrogen receptor (ER) alpha and beta and progestin receptor (PR) status were analyzed from paraffin-embedded tissue by immunohistochemistry and ER mRNA was measured in fresh tissue by reverse transcription polymerase chain reaction (RT-PCR). RESULTS: Ten of the twenty-two patients with low-grade endometrial stromal sarcomas developed recurrent disease. Four of five patients (80%) who received estrogen replacement therapy (ERT) recurred. Four of eight patients (50%) with retained ovaries recurred. Eight of the ten specimens available for analysis were positive for ERalpha, none were positive for ERbeta, and 9 of 10 were positive for PR. Four of thirteen patients who received progestins as adjuvant therapy recurred, compared with 6 of 9 patients who did not receive progestins (31% vs 67%). Eight recurrences were treated with progestin therapy and 7 (88%) of them had either stable disease (3/8, 38%) or complete response (4/8, 50%). CONCLUSIONS: Our results suggest that ERT may be detrimental in patients with low-grade endometrial stromal sarcoma. Retention of normally functioning ovaries, on the other hand, may not significantly affect the recurrence rate following hysterectomy alone in Stage I patients. The lack of ERbeta expression in endometrial stromal sarcomas compared with normal endometrial stromal cells suggests that loss of ERbeta may be a marker for malignancy. Progestin therapy should be routinely considered for adjuvant therapy and for the treatment of recurrent endometrial stromal sarcomas.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12821359&dopt=Abstract

Exp Neurol. 2003 Jul;182(1):208-19.
Differential vulnerability of male versus female rats to long-term effects of birth insult on brain catecholamine levels.

El-Khodor BF, Boksa P.

Departments of Psychiatry and of Neurology and Neurosurgery, McGill University, Douglas Hospital Research Centre, 6875 LaSalle Boulevard, Verdun, Quebec, Canada H4H 1R3.

There are gender differences in the prevalence and severity of several human behavioral disorders, in which both obstetric complications and dysregulation of brain monoamine systems have been implicated. In animal studies, males are more susceptible than are females to lasting behavioral deficits following various perinatal insults. The current study compared monoamine levels in brain regions from adult male and female rats that had been born under various conditions-vaginal birth (control), Caesarean section (C-section), or C-section with 15 min of added anoxia (Anoxia). At adulthood, male rats born by C-section had increased dopamine (DA) levels in the nucleus accumbens and dorsal striatum, and decreased amygdalar norepinephrine (NE), compared to vaginally born males. C-sectioned female rats had increased NE levels in the thalamus in comparison to vaginally born females. The only monoamine change observed in the Anoxia groups was a decrease in nucleus accumbens NE in females. Thus addition of 15 min of anoxia to the C-section procedure reversed several of the monoamine changes produced by C-section alone. Birth group had no effect on serotonin in several brain regions in either sex. Male, but not female, rats born by C-section had decreased plasma epinephrine levels at birth and slightly increased brain lactate at 5 h after birth. Pups of both sexes in the Anoxia groups had high levels of plasma catecholamines at birth. The possible functional significance of the lasting, region-specific changes in brain DA and NE due to birth insult and possible roles of hormones at birth in producing these monoamine changes in the two sexes are discussed.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12821391&dopt=Abstract

Hypertension. 2003 Aug;42(2):220-5. Epub 2003 Jun 23.
Increased pressor sensitivity to chronic nitric oxide deficiency in hyperthyroid rats.

Rodriguez-Gomez I, Sainz J, Wangensteen R, Moreno JM, Duarte J, Osuna A, Vargas F.

Departamento de Fisiologia, Facultad de Medicina, E-18012 Granada, Spain.

We studied the effects of a possible interaction between partial nitric oxide deficiency and thyroid hormone excess on the long-term control of blood pressure (BP) and morphological and renal variables and examined the role of the renin-angiotensin system in the increased BP of this interaction. Eight groups (n=8 each) of male Wistar rats were used: a control group; 3 groups that were treated with thyroxine (50 microg/d), Nw-nitro-L-arginine methyl ester (L-NAME; subpressor dose, 1.5 mg x kg(-1) d(-1)), or thyroxine plus L-NAME; and another 4 similarly treated groups that received losartan (20 mg x kg(-1) x d(-1)) in their drinking fluid. All treatments were maintained for 3 weeks. The time course of tail systolic BP was recorded once a week. At the end of the experimental period, we measured mean arterial pressure in conscious rats and assessed the morphological, metabolic, plasma, and renal variables. Thyroxine produced a mild BP increase from the second week of treatment and an increase in plasma angiotensin II and plasma nitrates/nitrites by the end of the study. Simultaneous administration of thyroxine and a subpressor dose of L-NAME produced a marked BP increase that reached significance from the first week of treatment. Losartan produced normotension in thyroxine-treated rats and attenuated the BP elevation in thyroxine+L-NAME-treated rats. Hyperthyroid rats showed relative renal and ventricular hypertrophy, absence of absolute left ventricular hypertrophy, and proteinuria. These alterations were not changed by losartan. We conclude that an impaired nitric oxide system might have a counterregulatory homeostatic role against the prohypertensive effects of thyroid hormone and that the renin-angiotensin system plays an important role in thyroxine+L-NAME hypertension.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12821601&dopt=Abstract

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