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Fatty acids resources:

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





Gen Comp Endocrinol. 2002 Oct 1;128(3):231-7.
Applying fenoxycarb at the penultimate instar triggers an additional ecdysteroid surge and induces perfect extra larval molting in the silkworm.

Kamimura M, Kiuchi M.

National Institute of Agrobiological Sciences, Tsukuba, Ibaraki 305-8634, Japan. kamimurffrc.go.jp

When the juvenile hormone analog fenoxycarb was topically applied to the silkworm Bombyx mori at the beginning of the 3rd or 4th (penultimate) instar, an extra larval molt was induced. The 5th instar period was shortened to about 5 days and the extra 6th instar ranged from 8 to more than 20 days, depending on the dose applied. Starvation before fenoxycarb treatment strongly enhanced the incidence of extra molting up to 100%. When 1 ng was applied in the 4th instar after a 2-day starvation, most larvae underwent an extra molt, metamorphosed to pupae, then to fertile adults. Combining starvation and fenoxycarb application thus induces a perfect extra molt efficiently. In perfect extra molting larvae, profiles of total ecdysteroid titer during the 4th and 5th instars were similar to that during the 4th instar in the control, and the ecdysteroid profile during the extra 6th instar was similar to that during the control 5th (last) instar. At ecdysteroid peaks, 20-hydroxyecdysone (20E) and ecdysone (E), generally regarded as the active molting hormone and its precursor, had similar titers in the 6th instar, whereas E was much less than 20E in the 4th and 5th instars in the extra molting larvae. E was also abundant only in the last larval instar in the control. These results suggest that both 20E and E contents are important for regulation of larval molt and metamorphosis in silkworms and that fenoxycarb triggers the extra molt by inducing an additional larval molt type of ecdysteroid surge before the last larval instar. 2002 Elsevier Science (USA)


online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12392697&dopt=Abstract



Gen Comp Endocrinol. 2002 Oct 1;128(3):238-46.
Effect of captivity in semi-natural enclosures on the reproductive endocrinology of female lizards.

Weiss SL, Jennings DH, Moore MC.

Department of Zoology, Evolution, Ecology and Organismal Biology Group, Duke University, Durham, NC 27708-0325, USA. slweissu.edu

Long-term captivity can result in abnormal behavior and physiology in many vertebrates. Here, we examine whether semi-natural, outdoor captive environments can offer a compromise, allowing much of the experimental control afforded by captivity, while providing the environmental conditions essential for normal behavior and physiology. We first determined plasma concentration of the sex steroid hormones progesterone, testosterone, and estradiol of free-ranging female striped plateau lizards (Sceloporus virgatus) throughout the reproductive season, and second, compared the results to those from conspecific females maintained in semi-natural outdoor enclosures. Among free-ranging females, levels of progesterone and estradiol were elevated during vitellogenesis, with an apparent surge in progesterone and testosterone occurring in association with ovulation. Following ovulation, estradiol fell to non-reproductive levels while progesterone remained elevated during the month-long period of gravidity. Long-term captivity in outdoor enclosures did not significantly affect progesterone or estradiol levels at any stage of the reproductive cycle, and did not affect testosterone levels during normal ovarian development and gravidity. However, (1) females with delayed oviposition in captivity had lower testosterone levels than free-ranging females with normal oviposition, and (2) when all females sampled were post-reproductive, captive females continued to have lower testosterone levels than free-ranging females. Thus, the endocrine response to captivity may be greater among post-reproductive females than among reproductive females. Our results are in marked contrast to many studies that show captivity can dramatically impair reproduction of female vertebrates. 2002 Elsevier Science (USA)


online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12392698&dopt=Abstract



Bioorg Med Chem Lett. 2002 Nov 18;12(22):3279-82.
Discovery and biological characterization of capromorelin analogues with extended half-lives.

Carpino PA, Lefker BA, Toler SM, Pan LC, Hadcock JR, Murray MC, Cook ER, DiBrino JN, DeNinno SL, Chidsey-Frink KL, Hada WA, Inthavongsay J, Lewis SK, Mangano FM, Mullins MA, Nickerson DF, Ng O, Pirie CM, Ragan JA, Rose CR, Tess DA, Wright AS, Yu L, Zawistoski MP, Pettersen JC, DaSilva-Jardine PA, Wilson TC, Thompson DD.

Pfizer Global Research & Development, Groton Labs, MS8220-3004, Groton, CT 06340, USA. philip_a_carpinroton.pfizer.com

New tert-butyl, picolyl and fluorinated analogues of capromorelin (3), a short-acting growth hormone secretagogue (GHS), were prepared as part of a program to identify long-acting GHSs that increase 24-h plasma IGF-1 levels. Compounds 4c and 4d (ACD LogD values >or=2.9) displayed extended plasma elimination half-lives in dogs, primarily due to high volumes of distribution, but showed weak GH secretagogue activities in rats (ED(50)s>10 mg/kg). A less lipophilic derivative 4 (ACD LogD=1.6) exhibited a shorter canine half-life, but stimulated GH secretion in two animal species. Repeat oral dosing of 4 in dogs for 29 days (6 mg/kg) resulted in a significant down-regulation of the post dose GH response and a 60 and 40% increase in IGF-1 levels relative to pre-dose levels at the 8- and 24-h post dose time points. Compound 4 (CP-464709-18) has been selected as a development candidate for the treatment of frailty.


online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12392732&dopt=Abstract [PubMed - in process]



Int J Dev Neurosci. 2002 Oct;20(6):503-10.
Ontogenetic development and neuroanatomical localization of growth hormone-releasing hormone (GHRH) in the brain and pituitary gland of pejerrey fish Odontesthes bonariensis.

Miranda LA, Strobl-Mazzulla PH, Somoza GM.

Instituto de Investigaciones Biotecnologicas/Instituto Tecnologico de Chascomus, (CONICET-Universidad de San Martin), Camino de Circunvalacion Laguna, Km 6 CC 164 (7130) Chascomus, Provincia de Buenos Aires, Argentina. lmirandntech.gov.ar

The presence and distribution of growth hormone-releasing hormone (GHRH) were studied by immunocytochemistry in adult and developing pejerrey fish, Odontesthes bonariensis (Atheriniformes). A few perikarya and fibers with immunoreactivity to GHRH (ir-GHRH) were identified in the olfactory bulbs at hatching. One week later, scattered ir-GHRH cell bodies were observed in the preoptic area and some fibers were detected entering the pituitary gland. Isolated ir-GHRH perikarya were revealed in the hypothalamus and in the medulla oblongata (MO) 3 weeks after hatching. Seven weeks after hatching, ir-GHRH cells were also identified in the nucleus of the lateral lemniscus and the cerebellum. Both nuclei presented strong ir-GHRH projections extending rostro-ventrally. At 11 weeks after hatching another group of ir-GHRH cells were revealed in the midbrain tegmentum. After that time the pattern of distribution of ir-GHRH structures remained unchanged. At 1 week after hatching and later, the pituitary gland consistently revealed ir-GHRH cells and fibers mainly in the proximalis pars distalis and in a minor proportion of the pars intermedia since week 1. The pineal gland showed ir-GHRH cells projecting into the pineal lumen, at week 6 after hatching and later. The pineal stalk and the subcomissural organ also presented ir-GHRH structures. Additionally, ir-GHRH material was found from week 3 to the adult stage in the following extraneural organs: gills, gut, kidney and hepatopancreas. These results represent the anatomical substrate for understanding the physiology of GHRH peptide in pejerrey, adding information on the ontogeny of neural structures expressing GHRH.


online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12392754&dopt=Abstract



Biochem Pharmacol. 2002 Nov 1;64(9):1317-24.
Expression and purification of a recombinant form of human aromatase from Escherichia coli.

Zhang F, Zhou D, Kao YC, Ye J, Chen S.

Division of Immunology, Beckman Research Institute of the City of Hope, 1450 East Duarte Road, Duarte, CA 91010, USA.

Aromatase converts androgen to estrogen, a hormone that plays an important role in the development of breast cancer. Aromatase inhibitors have been shown to be a useful endocrine regimen for estrogen-dependent breast cancer. Structure-function studies of aromatase can generate critical structural information for designing highly potent and specific inhibitors. However, aromatase structure-function studies have been hampered by a lack of purified protein. In this report, we describe the construction and expression of a recombinant derivative of human aromatase in Escherichia coli using the pET vector system, and the purification of the enzyme by means of nickel-agarose affinity chromatography. We examined the expression of the full-length, Del-38, C-6xHis-tagged Del-38, and NC-6xHis-tagged Del-38 forms of aromatase. The recombinant aromatase without the first 38 amino acids from the amino-terminus (i.e. Del-38) was found to have a higher activity than the full-length enzyme. Moreover, the addition of two separate hexameric histidine tags at both the amino and the carboxyl-termini (i.e. NC-6xHis-tagged Del-38) increased the binding affinity of the recombinant enzyme to the nickel-agarose. The expressed aromatase (i.e. NC-6xHis-tagged Del-38 aromatase) was eluted from the nickel-agarose with 80 mM EDTA. The total aromatase activity of the 80 mM EDTA-eluted fractions was significantly higher than the detergent-solubilized protein extract, indicating a renaturation process during the nickel-agarose affinity chromatography. Purified aromatase exhibited a single band when analyzed by SDS-PAGE, and activity up to 5.8 nmol/mg/min was obtained using the tritiated water release assay. The K(m) value for androstenedione was determined to be 62+/-24 nM by enzyme kinetic analysis. The recombinant aromatase preparation was also characterized by reduced CO-difference spectral analysis, reaction product extraction assay, and inhibition studies using two aromatase inhibitors (letrozole and anastrozole). The results indicate that the recombinant aromatase from E. coli has catalytic properties identical to those of the enzyme expressed in human tissue and will be very useful for further structure-function studies of aromatase.


online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12392814&dopt=Abstract







Natural Herbal Supplement: Hair Million


Hair loss alone does not pose significant health problems. In fact, there are people who opt for baldness as an alternative hair style. However, in general, however, hair loss is not considered desirable.

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 a biologically essential part of our body, just like appendix. The 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.

While the hair loss and resulting baldness in general have not been proven to be related to underlying health problems, there are certain correlations between hair loss and health problems. For instance, premature hair loss could suggest premature aging or nutritional and hormonal imbalance, stressful life, use of drugs that cause hair loss as a side effect, skin disease, or heart disease. The balding appearance could also impart a subdued impression of integrity in bodily health and youthfulness.












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