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Comp Biochem Physiol C Toxicol Pharmacol. 2000 Jun;126(2):129-37.
Vasopressin and A1 noradrenaline turnover during food or water deprivation in the rat.

El Fazaa S, Gharbi N, Kamoun A, Somody L.

Departement de Biologie, Faculte des Sciences, Tunis, Tunisia.

In the present study, we have examined in Wistar rats the effects of food or water deprivation of 3 days on the hypophyso-adrenal axis, vasopressinergic system and activity of A1 noradrenergic brain stem cell group, which is involved in the control of the hypothalamic neuro-endocrine activity. Levels of adrenocorticotropic hormone (ACTH) and vasopressin (AVP) were determined by radio-immunoassay, and corticosterone level was determined by fluorimetric method. Plasma levels of ACTH and corticosterone were greatly increased in both groups of rats. In water-deprived rats, plasma AVP (13.83 +/- 1.63 vs. 3.03 +/- 0.23 pg/ml) and osmolality levels were significantly elevated with a marked decrease of AVP hypophysis content (272 +/- 65 vs. 1098 +/- 75 ng/mg protein), but not in food-deprived rats in which osmolality did not change and AVP remained stocked (2082 +/- 216 ng/mg protein) in the hypophysis without release in the plasma (1.11 +/- 0.23 pg/ml). These observations indicated that both food-deprivation and water-deprivation stimulated the pituitary adrenal axis thereby suggesting a stress state. AVP production is stimulated both by fluid and food restriction but is secreted with differential effects: during food restriction AVP secretion is limited to supporting the hypothalamic pituitary-adrenal system.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11050685&dopt=Abstract

Cell. 2000 Sep 29;103(1):17-27.
Disruption of imprinted X inactivation by parent-of-origin effects at Tsix.

Lee JT.

Department of Molecular Biology, Massachusetts General Hospital, Boston 02114, USA. leolbio.mgh.harvard.edu

In marsupials and in extraembryonic tissues of placental mammals, X inactivation is imprinted to occur on the paternal chromosome. Here, we find that imprinting is controlled by the antisense Xist gene, Tsix. Tsix is maternally expressed and mice carrying a Tsix deletion show normal paternal but impaired maternal transmission. Maternal inheritance occurs infrequently, with surviving progeny showing intrauterine growth retardation and reduced fertility. Transmission ratio distortion results from disrupted imprinting and postimplantation loss of mutant embryos. In contrast to effects in embryonic stem cells, deleting Tsix causes ectopic X inactivation in early male embryos and inactivation of both X chromosomes in female embryos, indicating that X chromosome counting cannot override Tsix imprinting. These results highlight differences between imprinted and random X inactivation but show that Tsix regulates both. We propose that an imprinting center lies within Tsix.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11051544&dopt=Abstract

Am J Physiol Gastrointest Liver Physiol. 2000 Nov;279(5):G858-65.
Disruption of cyclooxygenase-1 gene results in an impaired response to radiation injury.

Houchen CW, Stenson WF, Cohn SM.

Division of Gastroenterology, Washington University, Saint Louis, Missouri, USA.

Prostaglandins may play an important role in regulating normal renewal of gastrointestinal epithelium, epithelial injury repair, and initiation or progression of intestinal neoplasia. Synthesis of prostaglandins is catalyzed by either of two cyclooxygenase isoforms, Cox-1 and Cox-2. Cox-1 is the predominant cyclooxygenase isoform found in the normal intestine. In contrast, Cox-2 is present at low levels in normal intestine but is elevated at sites of inflammation and in adenomas and carcinomas. To determine directly whether prostaglandins synthesized by Cox-1 or Cox-2 regulate crypt epithelial cell fate after genotoxic or cytotoxic injury, we examined apoptosis, prostaglandin synthesis, and crypt stem cell survival after gamma-irradiation in Cox-1(-/-) and Cox-2(-/-) mice. Cox-1(-/-) mice had increased crypt epithelial cell apoptosis and decreased clonogenic stem cell survival compared with wild-type littermates. PGE(2) synthesis was also diminished in Cox-1(-/-) mice compared with wild-type controls in unstressed intestine and after radiation injury. In contrast, apoptosis, stem cell survival, and intestinal PGE(2) synthesis in Cox-2(-/-) mice after irradiation were the same as in wild-type littermates. Crypt stem cell survival after irradiation was inhibited by a highly specific neutralizing antibody to PGE(2), suggesting that this prostaglandin mediates stem cell fate in vivo. These data suggest that prostaglandins synthesized by Cox-1 regulate multiple steps that determine the fate of crypt epithelial cell after genotoxic or cytotoxic injury.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11052981&dopt=Abstract

Toxicol Sci. 2000 Nov;58(1):88-95.
A single dose of 2,3,7,8-tetrachlorodibenzo-p-dioxin produces a time- and dose-dependent alteration in the murine bone marrow B-lymphocyte maturation profile.

Thurmond TS, Gasiewicz TA.

Department of Environmental Medicine, University of Rochester School of Medicine and Dentistry, 575 Elmwood Ave., Rochester, New York 14642, USA.

The halogenated aromatic hydrocarbon, 2,3,7, 8-tetrachlorodibenzo-p-dioxin (TCDD), is a ubiquitous, highly toxic environmental contaminant shown to produce immunotoxic effects in mammals. Although its immunotoxicity has been widely reported, little is known regarding its effect upon the development of immune-system cells, especially the B lymphocyte. The present study's purpose was to assess the effect that a single-dose administration of TCDD has, over time, upon bone marrow B-cell progenitors and pro/pre-B-, immature B-, and mature B-cell subpopulations, and to establish a dose-response relationship for these changes. Results showed that the mature B-lymphocyte subpopulation varied in a time-dependent manner, with a significant increase one day following TCDD treatment (30 microg/kg body weight [bw]), followed by a significant decrease at day 9 and a return to near-vehicle levels by day 31. Developing and less mature subpopulations were significantly decreased at days 6 and 9. The earliest B cell-progenitor subpopulation increased until day 9 and then decreased to vehicle-treated levels. Dose response (30, 15, 9, 6, 3, and 0.3 microg TCDD/kg bw) results at 2 days following treatment showed that only the mature-B subpopulation was affected at these doses, and below 6 microg/kg bw no effect was observed. These data suggest that the primary effect of TCDD is on those cells entering, and/or within, the mature B-lymphocyte subpopulation, and the alteration observed in the earlier maturation stages is a compensatory response to the effect on these mature cells.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11053544&dopt=Abstract

J Immunol. 2003 May 1;170(9):4649-55.
A role of CXC chemokine ligand 12/stromal cell-derived factor-1/pre-B cell growth stimulating factor and its receptor CXCR4 in fetal and adult T cell development in vivo.

Ara T, Itoi M, Kawabata K, Egawa T, Tokoyoda K, Sugiyama T, Fujii N, Amagai T, Nagasawa T.

Department of Immunology, Research Institute, Osaka Medical Center for Maternal and Child Health, Osaka, Japan.

The functions of a chemokine CXC chemokine ligand (CXCL) 12/stromal cell-derived factor-1/pre-B cell growth stimulating factor and its physiologic receptor CXCR4 in T cell development are controversial. In this study, we have genetically further characterized their roles in fetal and adult T cell development using mutant and chimeric mice. In CXCL12(-/-) or CXCR4(-/-) embryos on a C57BL/6 background, accumulation of T cell progenitors in the outer mesenchymal layer of the thymus anlage during initial colonization of the fetal thymus was comparable with that seen in wild-type embryos. However, the expansion of CD3(-)CD4(-)CD8(-) triple-negative T cell precursors at the CD44(-)CD25(+) and CD44(-)CD25(-) stages, and CD4(+)CD8(+) double-positive thymocytes was affected during embryogenesis in these mutants. In radiation chimeras competitively repopulated with CXCR4(-/-) fetal liver cells, the reduction in donor-derived thymocytes compared with wild-type chimeras was much more severe than the reduction in donor-derived myeloid lineage cells in bone marrow. Triple negative CD44(+)CD25(+) T cell precursors exhibited survival response to CXCL12 in the presence of stem cell factor as well as migratory response to CXCL12. Thus, it may be that CXCL12 and CXCR4 are involved in the expansion of T cell precursors in both fetal and adult thymus in vivo. Finally, enforced expression of bcl-2 did not rescue impaired T cell development in CXCR4(-/-) embryos or impaired reconstitution of CXCR4(-/-) thymocytes in competitively repopulated mice, suggesting that defects in T cell development caused by CXCR4 mutation are not caused by reduced expression of bcl-2.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12707343&dopt=Abstract

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