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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

J Med Entomol. 2002 May;39(3):475-9.
Factors influencing sperm transfer and insemination in cat fleas (Siphonaptera: Pulicidae) fed on an artificial membrane system.

Dean SR, Meola RW.

Department of Entomology, Texas A&M University, College Station 77843-2475, USA. sue-deaamu.edu

Sperm transfer through the epididymis, a prerequisite for insemination of cat fleas, Ctenocephalides felis (Bouche) was stimulated by exposure of unfed male fleas to juvenile hormone III residues for 3 d at 25 degrees C or exposure of unfed fleas to 37 degrees C for 6 d. Sperm transfer was completed at least three times faster in unfed males held at 37 degrees C than in those held at 25 degrees C. Although percentage sperm transfer in fleas fed water or 0.15 M saline at 37 degrees C was not significantly increased over that of unfed fleas, a significantly greater percentage of blood-fed males completed sperm transfer at 2, 3, and 6 d. At least two factors influenced insemination: exposure of fleas to host body temperature and amount of food consumption. When blood-fed males and females were paired and fed 0.15 M saline, 0% were inseminated at 25 degrees C versus 35% at 37 degrees C. Because percentage insemination did not increase in blood-fed males and females that were paired and fed 0.15 M saline at 37 degrees C for an additional 48 h, continuous bloodfeeding appeared to be required for maximal rates of mating and insemination. Furthermore, no females were inseminated when blood-fed males and females were paired at 37 degrees C and starved. Treatment of unfed fleas with juvenile hormone III did not substitute for bloodfeeding in stimulating mating and insemination; when blood-fed males were paired with JH III-treated females and vice versa and fed 0.15 M saline at 37 degrees C, 0% were inseminated. However, when fleas were fed 0.15 M saline and exposed to 1,250 ppm juvenile hormone III or fed whole blood and exposed to 12.5, 125, or 1,250 ppm juvenile hormone III, percent insemination was significantly increased in comparison to the controls. Therefore, juvenile hormone secretion in blood-fed fleas may regulate mating success indirectly by stimulating sperm transfer.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12061443&dopt=Abstract

J Antibiot (Tokyo). 2002 Apr;55(4):417-22.
PPARgamma activation and adipocyte differentiation induced by AS-6, a prenyl-phenol antidiabetic antibiotic.

Togashi M, Masuda H, Kawada T, Tanaka M, Saida K, Ando K, Tamura G, Magae J.

Department of Biotechnology, Institute of Research and Innovation, Kashiwa, Japan.

The prenyl-phenol antibiotics ascochlorin-related compounds, are known to reduce serum cholesterol and triglyceride, suppress hypertension, and ameliorate types-I and II diabetes. However, little is known about the molecular mechanism for these physiological effects. Here we report that the ascochlorin derivative, 4-O-carboxymethyl ascochlorin (AS-6) acts as a potent activator of the nuclear hormone receptor, PPARgamma, although it does not activate the related receptors, PPARalpha, PPARdelta or RARalpha. AS-6 interacts directly with the PPARgamma molecule in vitro, and induces differentiation of the mouse preadipocyte cell line 3T3-L1. Our results suggest that AS-6 is a partial agonist for PPARgamma with a novel chemical structure.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12061550&dopt=Abstract

Biochem Biophys Res Commun. 2002 Jun 21;294(4):749-52.
Hormonal induction of hepatic mitochondrial ornithine/citrulline transporter mRNA.

Morris SM Jr, Kepka-Lenhart D.

Department of Molecular Genetics and Biochemistry, University of Pittsburgh School of Medicine, W1255 Biomedical Science Tower, PA 15206, USA. smorriitt.edu

The urea cycle, which involves enzymes located in both the mitochondrion and cytoplasm, requires transport of ornithine and citrulline across the mitochondrial membrane by the ornithine/citrulline antiporter ORNT1. Expression of the urea cycle enzymes can change dramatically in response to hormones, but it is not known whether ORNT1 expression also is hormonally regulated. This study therefore tested the hypothesis that ORNT1 mRNA levels in hepatocytes are induced by cAMP and glucocorticoid as are the urea cycle enzyme mRNAs. ORNT1 mRNA was rapidly induced by a cAMP analog and dexamethasone in cultured rat hepatocytes and there was a strong synergistic response to a combination of these agents. Ongoing protein synthesis was required for induction of ORNT1 mRNA by dexamethasone but not by cAMP, suggesting that the dexamethasone response required an accessory factor. Thus, hormonal regulation of ORNT1 mRNA in hepatocytes is coordinated with that of mRNAs encoding the urea cycle enzymes. (c) 2002 Elsevier Science (USA).

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12061769&dopt=Abstract

J Dairy Sci. 2002 Nov;85(11):2843-9.
Effect of electric and magnetic fields (60 Hz) on production, and levels of growth hormone and insulin-like growth factor 1, in lactating, pregnant cows subjected to short days.

Rodriguez M, Petitclerc D, Nguyen DH, Block E, Burchard JF.

Department of Animal Science, McGill University, 21,111 Lakeshore Rd. Ste. Anne de Bellevue, QC, Canada H9X 3V9.

Electric and magnetic fields (EMF) are generated by the transmission of electricity through high tension lines traversing rural areas. Previous studies showed increased dry matter intake (DMI) and fat corrected milk in dairy cows exposed to EMF. Because EMF exposure has been shown to suppress pineal release of melatonin in some species, it was hypothesized that EMF effects resemble those of exposure to long days. Previous studies have shown that DMI and milk production increase in dairy cattle in response to long day photoperiods, and this has been observed in association with increased circulating insulin-like growth factor 1 (IGF-1), but not growth hormone (GH). The hypothesis that EMF act by modifying the response to photoperiod was tested by subjecting dairy cows to controlled EMF exposure while keeping them under short-day conditions. Sixteen lactating, pregnant Holstein cows were exposed to a vertical electric field of 10 kV/m and a horizontal magnetic field of 30 microT in a crossover design with treatment switchback. Two groups of eight cows each were exposed to EMF for 16 h/d in either oftwo sequences. Each sequence consisted of three consecutive 28-d periods. All animals were maintained under short day conditions (8 h light, 16 h dark) during the trial. DMI and plasma IGF-1 were increased (P < 0.01) during EMF exposure (17.03 vs.16.04 kg/d, SE = 0.4; 137 +/- 6 ng/ml vs 126 +/- 6, respectively). The mean GH concentration was not affected, but a treatment x hour interaction was detected, with GH lower for the EMF exposed animals during the first 16 h of the sampling period, and higher for the last 8 h. Overall, the yield of milk or its components was not affected by EMF exposure, but milk yield was significantly higher for the exposed animals during wk 4 of treatment.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12487451&dopt=Abstract

J Med Chem. 2002 Jun 20;45(13):2801-10.
Structure-activity relationships of the melanocortin tetrapeptide Ac-His-DPhe-Arg-Trp-NH(2) at the mouse melanocortin receptors. 1. Modifications at the His position.

Holder JR, Bauzo RM, Xiang Z, Haskell-Luevano C.

Department of Medicinal Chemistry, University of Florida, Gainesville, FL 32610, USA.

The melanocortin pathway is an important participant in obesity and energy homeostasis. The centrally located melanocortin-3 and melanocortin-4 receptors (MC3R, MC4R) are involved in the metabolic and food intake aspects of energy homeostasis and are stimulated by melanocortin agonists such as alpha-melanocyte stimulation hormone (alpha-MSH). The melanocortin agonists contain the putative message sequence "His-Phe-Arg-Trp", and it has been well documented that inversion of chirality of the Phe to DPhe results in a dramatic increase in melanocortin receptor potency. Herein, we report a tetrapeptide library based on the template Ac-His-DPhe-Arg-Trp-NH(2), consisting of 17 members that have been modified at the His(6) position (alpha-MSH numbering) and pharmacologically characterized for agonist activity at the mouse melanocortin receptors MC1R, MC3R, MC4R, and MC5R. These studies provide further experimental evidence that the His(6) position can determine MC4R versus MC3R agonist selectivity and that chemically nonreactive side chains may be substituted for the imidazole ring (generally needs to be side chain protected in synthetic schemes) in the design of MC4R-selective, small-molecule, non-peptide agonists. Specifically, the tetrapeptide containing the amino-2-naphthylcarboxylic acid (Anc) amino acid at the His position resulted in a potent agonist at the mMC4R (EC(50) = 21 nM), was a weak mMC3R micromolar antagonist (pA(2) = 5.6, K(i) = 2.5 microM), and possessed >4700-fold agonist selectivity for the MC4R versus the MC3R. Substitution of the His(6) amino acid in the tetrapeptide template by the Phe, Anc, 3-(2-thienyl)alanine (2Thi), and 3-(4-pyridinyl)alanine (4-Pal) resulted in equipotency or only up to a 7-fold decrease in potency, compared to the His(6)-containing tetrapeptide at the mMC4R, demonstrating that these amino acid side chains may be substituted for the imidazole in the design of MC4R-selective non-peptide molecules.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12061882&dopt=Abstract

The most ostensive feature that distinguishes us human from chimps and other primates is the lack of bodily hair. During evolutionary process, we have lost the majority of hair. Hair is no longer an essential part of our body, just like appendix. What little hair we still have on our scalp and a few other bodily parts is still regarded as significant for reasons other than biological necessity. Hair loss is naturally accompanied by aging process, although the extent of hair loss and the timing of onset vary widely among individuals. Thus, loss of hair and baldness is considered as a symbol of maturity or old age. Like winkles and other signs of aging, hair loss is not welcome by most people, because we don't welcome aging, and being perceived as an aging person. However, it is alopecia, or premature hair loss that especially concerns certain people.

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