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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

Biochem Biophys Res Commun. 1999 Feb 24;255(3):731-4.
Capacity of a low calcium diet to induce the renal vitamin D 1a-hydroxylase is decreased in adult rats.

Armbrecht HJ, Hodam TL, Boltz MA, Kumar VB.

Geriatric Research, Education, and Clinical Center, St. Louis VA Medical Center, St. Louis, Missouri, 63125, USA. hjarmbreol.com

Young animals adapt to a low calcium diet by increasing renal production of 1,25-dihydroxyvitamin D [1,25(OH)2D], the active metabolite of vitamin D. However, the capacity of adult animals to adapt is markedly diminished. With the recent cloning of the cytochrome P450 component (CYP1a) of the renal 1-hydroxylase enzyme complex, it is now possible to determine directly the effect of dietary calcium and maturation on the expression of renal 1-hydroxylase. Using a ribonuclease protection assay, it was found that feeding a low Ca diet markedly increased renal CYP1a mRNA levels in young rats. However, feeding this diet to adult rats produced an increase in CYP1a mRNA that was only 10% that of the young rats. These studies demonstrate that a low calcium diet increases renal 1,25-dihydroxyvitamin D production in young animals but not in adult animals by increasing CYP1a expression. Since the low calcium diet increased plasma parathyroid hormone levels to similar levels in both age groups, this suggests that in the adult there is a renal refractoriness to parathyroid hormone. 1999 Academic Press.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=10049779&dopt=Abstract

Toxicol Sci. 1998 Dec;46(2):294-9.
Evidence for Ah receptor mediation of increased ACTH concentrations in primary cultures of rat anterior pituitary cells exposed to TCDD.

Bestervelt LL, Pitt JA, Piper WN.

Toxicology Department, NSF International, Ann Arbor, Michigan 48105, USA.

2,3,7,8-Tetrachlorodibenzo-p-dioxin (TCDD) has been shown to increase plasma ACTH concentrations in male Sprague-Dawley rats and in male rat primary anterior pituitary cell cultures. The present study examined whether the anterior pituitary effects observed after TCDD exposure are mediated via the Ah receptor (AhR). Primary anterior pituitary cell cultures were prepared from normal 180- to 220-g male rats and the cultures treated with alpha-naphthoflavone (ANF), an antagonist; beta-naphthoflavone (BNF), an agonist; BNF + TCDD; 3,3',4,4',5-pentachlorobiphenyl (PCB), which is known to bind to the AhR; and 2,2',4,4',5,5'-hexachlorobiphenyl (HCB), which does not bind the AhR. Support for the TCDD-AhR-mediated increases in ACTH concentrations is provided by the following observations: (1) ANF inhibited both the 1.3- to 2-fold TCDD-induced increase in basal medium and intracellular ACTH concentrations and the 30% TCDD-induced decrease in medium ACTH levels and the 1.2-fold increase in intracellular ACTH levels in corticotropin-releasing hormone (CRH)-stimulated cells, (2) BNF increased basal medium (1.7-fold) and intracellular (1.3-fold) ACTH concentrations, (3) BNF + TCDD demonstrated additivity by increasing basal medium (2.4-fold) and intracellular (1.7-fold) ACTH concentrations, (4) PCB increased basal medium (1.8- to 2.1-fold) and intracellular (1.3- to 1.8-fold) ACTH concentrations and inhibited medium ACTH secretion in CRH stimulated cells by 24-43%, and (5) HCB did not effect basal or CRH stimulated medium and intracellular ACTH concentrations. From this study it appears that TCDD-induced changes in ACTH secretion and synthesis by cultured anterior pituitary cells is mediated through the Ah receptor.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=10048132&dopt=Abstract

J Clin Endocrinol Metab. 1999 Feb;84(2):632-5.
Cerebellin enhances in vitro secretory activity of human adrenal gland.

Mazzocchi G, Andreis PG, De Caro R, Aragona F, Gottardo L, Nussdorfer GG.

Department of Human Anatomy, University of Padua, Italy.

Cerebellin is a 16-amino acid peptide, originally isolated from rat cerebellum, whose presence has been recently demonstrated in the human adrenal glands and especially in medullary chromaffin cells. Cerebellin concentration dependently increased basal catecholamine (norepinephrine and epinephrine) release by human adrenal slices, containing medullary chromaffin tissue, minimal and maximal effective concentrations being 10(-9) and 10(-7) mol/L. Cerebellin (10(-7) mol/L) markedly enhanced cAMP release by adrenal slices, and the protein kinase A inhibitor H-89 (10(-5) mol/L) blocked catecholamine response to cerebellin. Cerebellin did not affect basal steroid secretion of dispersed human adrenocortical cells, but it concentration dependently increased aldosterone and cortisol production by adrenal slices. Again minimal and maximal effective concentrations were 10(-9) and 10(-7) mol/L. Aldosterone and cortisol responses to 10(-7) mol/L cerebellin was suppressed by both the beta-adrenoceptor antagonist l-alprenolol (10(-6) mol/L) and H-89 (10(-5) mol/L). Collectively, the present findings allow us to conclude that 1) cerebellin exerts a sizable secretagogue action on both cortex and medulla of human adrenals; 2) the peptide directly stimulates catecholamine release via the adenylate cyclase/protein kinase A-dependent signaling pathway; and 3) the mechanism underlying the adrenocortical stimulatory effect of cerebellin is indirect and probably involves the release of catecholamines, which in turn, acting in a paracrine manner, enhance steroid-hormone secretion.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=10022429&dopt=Abstract

Hum Pathol. 1999 Feb;30(2):208-15.
Expression of proopiomelanocortin (POMC)-derived melanocyte-stimulating hormone (MSH) and adrenocorticotropic hormone (ACTH) peptides in skin of basal cell carcinoma patients.

Slominski A, Heasley D, Mazurkiewicz JE, Ermak G, Baker J, Carlson JA.

Department of Pathology, Loyola University Medical Center, Maywood, IL 60153, USA.

We proposed that local expression and production of proopiomelanocortin (POMC) peptides may play a role in human skin physiology and pathology, including the development and progression of skin cancers. Reverse transcription polymerase chain reaction (RT-PCR) and Northern blotting hybridization techniques were used to study gene expression. Reversed-phase (RP) high-pressure liquid chromatography (HPLC) separation with subsequent radioimmunoassays were used to identify alpha-melanocyte-stimulating hormone (alpha-MSH) and adrenocorticotropic hormone (ACTH) peptides. Immunocytochemistry (IHC) was used to localize ACTH, alpha-MSH, and beta-MSH antigens in skin. RT-PCR, RP-HPLC, and IHC analyses documented the expression of POMC mRNA and production of ACTH and alpha-MSH peptides in lesional and perilesional skin of basal cell carcinoma (BCC) patients and in cultured keratinocytes, which was accompanied by the expression of the MC1-R gene encoding the receptor activated by MSH and ACTH. Thirty specimens were analyzed by IHC. Immunoreactive alpha-MSH, beta-MSH, and ACTH were detected, in 21 of 21, in 11 of 20, and in 6 of 8 of lesional skin, and in 6 of 6, in 5 of 7, and in 6 of 8 perilesional skin specimens analyzed, respectively. Antigen distribution was heterogenous and present in BCC, epidermis, hair follicles, dermal mononuclear cells, and extracellular matrix. We conclude that messenger RNA for POMC, MC1-R, and the peptides MSH and ACTH are produced in skin of BCC patients. Because keratinocytes are a target for MSH and ACTH bioregulation, the production of these peptides is stimulated by UVB, and the peptides can act as immunosupressors, we suggest that MSH and ACTH may facilitate development of BCC.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=10029451&dopt=Abstract

Fertil Steril. 2003 Feb;79(2):434-6.
Isolated follicle-stimulating hormone (FSH) deficiency in a young man with normal virilization who did not have mutations in the FSHbeta gene.

Mantovani G, Borgato S, Beck-Peccoz P, Romoli R, Borretta G, Persani L.

Institute of Endocrine Sciences, University of Milan, Ospedale Maggiore IRCCS, Italy.

OBJECTIVE: To determine the cause of isolated FSH deficiency in a young infertile man. DESIGN: Case report. SETTING: Clinical and genetic studies in an academic research environment. PATIENT(S): A 19-year-old man with normal virilization, azoospermia, and isolated FSH deficiency. INTERVENTION(S): Pituitary and gonadal functions were evaluated at baseline and after repeated GnRH stimulation. FSH was tested with both immunological and biological methods. The FSHbeta gene was sequenced in the patient and in a series of 50 controls. MAIN OUTCOME MEASURE(S): Clinical, endocrine, and genetic characterization of an infertile patient with isolated FSH deficiency. RESULT(S): LH and T secretions were normal. No interference in FSH measurement was detected, and serum FSH concentrations were very low and completely unresponsive to repeated GnRH stimulation. No circulating FSH-like bioactivity was detected by means of rat Sertoli cell bioassay. Other pituitary functions were unaffected, and no lesions were seen at pituitary nuclear magnetic resonance (NMR). Inhibin B and activin levels were normal, but a progressive decrease of activin concentrations was seen during GnRH stimulation. The coding sequence of the FSHbeta gene was normal, but the patient was homozygous for a novel G/T substitution in the promoter region within a P response element. This substitution was present in heterozygosity in eight out of 50 controls and in homozygosity in one man with normal FSH levels. CONCLUSION(S): We report an infertile male with isolated FSH deficiency but no evidence of mutations in the FSHbeta gene. The G/T substitution in the FSHbeta promoter represents a novel silent polymorphism, indicating that other defects in factors involved in FSH-specific expression should be taken into account.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12568861&dopt=Abstract

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