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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 || Follicle and follicular cells research abs 1

Reprod Nutr Dev. 2003 Jan-Feb;43(1):17-28.
Influence of maternal environment on the number of transferable embryos obtained in response to superovulatory FSH treatments in ewes.

Gonzalez-Bulnes A, Garcia-Garcia RM, Castellanos V, Santiago-Moreno J, Ariznavarreta C, Dominguez V, Lopez-Sebastian A, Tresguerres JA, Cocero MJ.

Dpto. de Reproduccion Animal, INIA, avda. Puerta de Hierro s/n, 28040-Madrid, Spain. bulnenia.es

In a first experiment, embryo viability was estimated after recovery in the uterus or the oviduct of 70 Manchega ewes following a treatment of superovulation with decreasing doses of OVAGEN. Fewer viable embryos (5.6 +/- 0.9 vs. 8.3 +/- 0.8, P < 0.05) and more degenerative embryos (31.3% vs. 6.8%, P < 0.005) were obtained from the uterus than from the oviduct respectively. In a second experiment performed on 14 ewes, embryo viability was analyzed in relation to the follicular population estimated by ultrasonography (follicles > or = 2 mm) at the first FSH administration. Progesterone (P4) and oestradiol 17beta (E2) concentrations were also determined from the beginning of the superovulation treatment to the recovery of the embryos. The number of viable embryos (4.3 +/- 1.4) was positively correlated (r = 0.824) with of 2-4 mm diameter follicles (P < 0.05), and with E2 concentrations at -12 h (r = 0.891, P < 0.01) , 0 h (r = 0.943, P < 0.0001) and +24 h (r = 0.948, P < 0.05) from estrus detection. Prolonged high levels of E2 up to 72 h with low levels of P4 on days 3 and 4 after estrus had a negative (P < 0.05) effect on embryo viability. These results indicate that ovarian response to superovulatory protocols is related to the individual variations in the number of follicles of 2-4 mm at the start of FSH treatment, and that embryo viability is conditioned by the steroid patterns during the time spent in the genital tract of the super-ovulated ewes.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12785447&dopt=Abstract [PubMed - in process]

J Invest Dermatol. 2003 Jun;120(6):895-904.
Plasticity and cytokinetic dynamics of the hair follicle mesenchyme: implications for hair growth control.

Tobin DJ, Gunin A, Magerl M, Handijski B, Paus R.

Department of Biomedical Sciences, University of Bradford, Bradford, UK.

The continuously remodeled hair follicle is a uniquely exploitable epithelial-mesenchymal interaction system. In contrast to the cyclical fate of the hair follicle epithelium, the dynamics of the supposedly stable hair follicle mesenchyme remains enigmatic. Here we address this issue using the C57BL/6 hair research model. During hair growth, increase in total follicular papilla size was associated with doubling of papilla cell numbers, much of which occurred before intra-follicular papilla cell proliferation, and subsequent to mitosis in the proximal connective tissue sheath. This indicates that some papilla cells originate in, and migrate from, the proliferating pool of connective tissue sheath fibroblasts. Follicular papilla cell number and total papilla size were maximal by anagen VI, but intriguingly, decreased by 25% during this period of sustained hair production. This cell loss, which continued during catagen, was not associated with intra-follicular papilla apoptosis, strongly indicating that fibroblasts migrate out of the late anagen/early catagen papilla and re-enter the proximal connective tissue sheath. Low-level apoptosis occurred only here, along with the "detachment" of cells from the regressing connective tissue sheath. Thus, the hair follicle mesenchyme exhibits significant hair cycle-associated plasticity. Modulation of these cell interchanges is likely to be important during clinically important hair follicle transformations, e.g. vellus-to-terminal and terminal-to-vellus during androgenetic alopecia.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12787113&dopt=Abstract

J Invest Dermatol. 2003 Jun;120(6):905-14.
Human skin is a steroidogenic tissue: steroidogenic enzymes and cofactors are expressed in epidermis, normal sebocytes, and an immortalized sebocyte cell line (SEB-1).

Thiboutot D, Jabara S, McAllister JM, Sivarajah A, Gilliland K, Cong Z, Clawson G.

Department of Dermatology, The Pennsylvania State University College of Medicine, Hershey, Pennsylvania 17033, USA. dthiboutosu.edu

Although the human sebaceous gland can synthesize cholesterol from acetate and can further metabolize steroids such as dehydroepiandrosterone into potent androgens, the de novo production of steroids from cholesterol has not been demonstrated in human skin. The goal of this study was to delineate the steroidogenic pathway upstream from dehydroepiandrosterone by documenting the presence of members of the P450 side chain cleavage system (P450scc). This system catalyzes the initial step in steroid hormone synthesis following translocation of cholesterol to the inner mitochondrial membrane. In concert with its cofactors, adrenodoxin and adrenodoxin reductase, and the transcription factor steroidogenic factor 1, P450scc converts cholesterol to pregnenolone. An SV40 immortalized human sebaceous gland cell line (SEB-1) was established in order to facilitate investigation of the P450scc system. The sebaceous phenotype of SEB-1 sebocytes was confirmed using immunohistochemistry, Oil Red O staining, and gene array expression analysis. Presence of P450scc, adrenodoxin reductase, cytochrome P450 17-hydroxylase (P450c17), and steroidogenic factor 1 was documented in human facial skin, human sebocytes, and SEB-1 sebocytes. Using immunohistochemistry, antibodies to the above proteins localized to epidermis, hair follicles, sebaceous ducts, and sebaceous glands in sections of facial skin. Results of immunohistochemistry were confirmed with Western blotting. Biochemical activity of cytochrome P450scc and P450c17 was demonstrated in SEB-1 sebocytes using radioimmunoassay. The relative abundance of mRNA for P450scc, P450c17, and steroidogenic factor 1 in SEB-1 sebocytes and sebaceous glands was compared to mRNA levels in ovarian theca and granulosa cells using real-time quantitative polymerase chain reaction. Gene array expression analysis and quantitative polymerase chain reaction indicated that mRNA for P450scc is more abundant than mRNA for both P450c17 and steroidogenic factor 1 in sebaceous glands and SEB-1 cells. These data demonstrate that the skin is in fact a steroidogenic tissue. The clinical significance of this finding in mediating androgenic skin disorders such as acne, hirsutism, or androgenetic alopecia remains to be established.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12787114&dopt=Abstract

J Invest Dermatol. 2003 Jun;120(6):1052-7.
Desmoglein isotype expression in the hair follicle and its cysts correlates with type of keratinization and degree of differentiation.

Wu H, Stanley JR, Cotsarelis G.

Department of Pathology, Fox Chase Cancer Center, Philadelphia, Pennsylvania, USA.

Within stratified squamous epithelia, such as the epidermis, desmogleins are generally expressed in a differentiation-specific manner. Similar to the epidermis, the hair follicle is compartmentalized into a hierarchy of cell types based on their level of differentiation. Relatively undifferentiated stem cells in the bulge can generate epidermis, sebaceous gland, and hair bulb matrix cells. The latter give rise to at least six different cell types that keratinize as they move up the hair shaft and inner root sheath. Here, we examined expression patterns of the desmoglein isotypes, desmogleins 1, 2, and 3 in the cutaneous epithelium, and discovered that desmoglein 1 and 2 expression correlated with the state of differentiation of defined populations within the hair follicle. Desmoglein 2 was highly expressed by the least differentiated cells of the cutaneous epithelium, including the hair follicle bulge of the fetus and adult, bulb matrix cells, and basal layer of the outer root sheath. In contrast, desmoglein 1 defined more differentiated cell populations, and was expressed in epidermal suprabasal cells, the inner root sheath, and the innermost layers of the outer root sheath. We found that the expression pattern of desmoglein 3 correlated with different types of keratinization. In areas of trichilemmal keratinization in the follicle, and in cysts arising from these areas, desmoglein 3 was expressed throughout all layers of the outer root sheath and cyst wall. In areas of epidermal-like keratinization, such as in the infundibulum and in epidermal inclusion cysts, desmoglein 3 expression was limited mainly to the basal layer. We conclude that desmoglein expression patterns define compartments of cells in similar states of differentiation within the cutaneous epithelium, and reveal a hierarchy of differentiation among these compartments.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12787134&dopt=Abstract

Prog Neuropsychopharmacol Biol Psychiatry. 2003 Jun;27(4):587-94.
Valproic acid fails to induce polycystic ovary syndrome in female rats.

Lagace DC, Nachtigal MW.

Department of Pharmacology, Dalhousie University, Tupper Medical Building, 5850 College Street, 5859 University Avenue, Halifax, Nova Scotia, Canada B3H 1X5.

PURPOSE: Valproic acid (VPA) treatment in female patients is suggested to be associated with the occurrence of a variety of endocrine side effects that include many characteristic symptoms of polycystic ovary syndrome (PCOS). The aim of our study was to prospectively measure whether VPA treatment was associated with the presentation of PCOS symptoms in rats, as well as determine whether this model could be used to examine the underlying mechanism by which these effects are induced. METHODS: Normal estrus-cycling female rats (n=22) were treated perorally three times daily with VPA (300 mg/kg/day), divalproex sodium (DVS) (330 mg/kg/day), or phosphate-buffered saline for a minimum of 30 days. PCOS-associated symptoms (estrus cycle, weight, estradiol and testosterone levels, aromatase activity, and ovarian morphology) were assessed at baseline, mid-, and endpoint. RESULTS: There was no significant difference in the mean number of days animals were in proestrus-estrus or metestrus-diestrus between the three groups. All groups of animals gained weight during the study and there were no appreciable differences in mean weight gain or leptin between groups. Total serum estradiol or testosterone levels and ovarian aromatase activity were not significantly different between the groups. The number of corpora lutea was not significantly different between the groups; however, cystic follicles were present in 50% of the drug-treated animals compared to 25% of saline-treated animals. CONCLUSIONS: VPA and DVS treatment were associated with a higher proportion of animals developing cystic follicles but did not mimic the VPA-induced PCOS that is observed in women. Thus, it appears that the rat has limited usefulness for modeling VPA-induced symptoms associated with PCOS.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12787843&dopt=Abstract

Like developmental biology of any part of our body, hair growth is a complicated process. Hence the homework for modern science to yet unravel the process and mechanism to a completion. There exist a number of traditional and alternative therapeutic methods that include drugs, surgery, suppelements, and even snake oils that have been developed and used for those who lose hair. No understanding, and there is no solution. Of course, none of these approaches are perfect for all hair loss problems, especially due to the heterogeneity of the causes underlying hair losses. Most of chemical drugs and hair transplantation surgeries are accompanied by undesirable side effects.

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