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Autoimmunity. 2000 Dec;32(4):255-63.
Cultures of human colonic epithelial cells isolated from endoscopical biopsies from patients with inflammatory bowel disease. Effect of IFNgamma, TNFalpha and IL-1beta on viability, butyrate oxidation and IL-8 secretion.

Pedersen G, Saermark T, Bendtzen K, Brynskov J.

Department of Medical Gastroenterology C. Herlev University Hospital, Copenhagen, Herlev, Denmark. gipeerlevhosp.kbhamt.dk

Cytokine-mediated impairment of viability and metabolic function of epithelial cells has been suggested as a possible early pathogenic event in the development of inflammatory bowel disease (IBD). It is currently unknown whether pro-inflammatory cytokines have a direct effect on human nontransformed colonic epithelial cells. We investigated the effects of TNFalpha, IFNgamma and IL-1beta on viability, short chain fatty acid (butyrate) oxidation and IL-8 secretion in human colonic epithelial cell cultures in vitro obtained from macroscopically normal mucosa from IBD patients and controls. Colonic crypts were isolated from endoscopical biopsies by ultra-short (10 min) EDTA/EGTA treatment, and exposed to TNFalpha, IFNgamma and IL-1beta for 24 hours. The combination of TNFalpha+IFNgamma induced a significant decrease in cell viability as judged by methyltetrazoleum (MTT) metabolism which decreased to median 68% of unexposed cultures (P < 0.01). This effect was more pronounced than that observed after addition of TNFalpha (median 88%) (P < 0.05), but not IFNgamma alone (median 78%), whereas IL-1beta had no significant effect. Cells from IBD patients were significantly less sensitive to TNFalpha + IFNgamma exposure (median 74%) compared to cells from controls (median 58 %) (P < 0.05). Butyrate oxidation, as measured by entrapment of 14CO2, was not inhibited in cells exposed to TNFalpha + IFNgamma, neither from controls (median 112%) nor from IBD patients (median 108%), suggesting a relative increase of this specific metabolic function in living cells in response to immunoinflammatory stress. IL-8 levels in cell supernatants were increased by TNFalpha + IFNgamma, supporting the role of the epithelium in signalling between luminal factors and mucosal immune cells. In conclusion, we report that TNFalpha and IFNgamma damage and influence human colonic epithelial cell function in vitro and that such mechanisms, if operative in vivo, also may be involved in the pathogenesis of IBD.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11191284&dopt=Abstract

cryo.affrc.go.jp

The effects of a combination of EGF and IGF-I (GFs) on the progress of meiosis and on their developmental competence were examined in cumulus-enclosed bovine oocytes. Exposure to GFs in serum-free, 0.3% PVP-containing maturation medium significantly (P<0.05) increased the frequency of oocytes with the first polar body (PB) at 16 h of culture and decreased those with PB at 20 h. The cleavage rates of PB-extruded oocytes after fertilization were not affected by treatment of GFs during maturation culture, and blastocyst yield was not improved by GFs treatment. Although replacement of PVP from GFs-containing medium with fatty acid-free BSA did not affect the timing of PB extrusion, replacement with 10% FCS neutralized the acceleration effects of GFs. Replacement for macromolecule in maturation medium did not improve blastocyst yield of PB-extruded oocytes after fertilization. These results indicate that the progression of meiosis in bovine oocytes with cumulus cells is accelerated by exposure to GFs in serum-free maturation medium but their developmental competence is not improved, and that the acceleration effects on the progress of meiosis is neutralized by the presence of FCS in maturation medium with no improvement of developmental competence after in vitro fertilization.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11192191&dopt=Abstract

J Comp Physiol [B]. 2000 Dec;170(8):581-8.
The absorption of calcium ions from the ovine reticulo-rumen.

Wadhwa DR, Care AD.

Welsh Institute of Rural Studies, University of Wales, Aberystwyth.

Net Ca2+ and Mg2+ absorption rates were measured in vivo from buffer solutions placed in the washed reticulo-rumen, isolated in situ in 30 conscious, trained sheep. An increase in concentration of short chain fatty acids (SCFA) in the buffer, over the range 0-50 mM, was shown to stimulate the net rates of absorption of Ca2+ and Mg2+ ions from the rumen. Similarly, the results of in vitro experiments, carried out with ovine rumen epithelium mounted in short-circuited Ussing chambers, showed that the absence of SCFA from the chamber fluid resulted in a reduction in Jnet Ca2+ caused by reduced flux of Ca2+ ions in the mucosal to serosal direction (Jms Ca2+). The addition of 1 mM acetazolamide, an inhibitor of carbonic anhydrase, to the ruminal buffer used in the in vivo experiments led to significant reductions in the net absorption rates of Ca2+ and Mg2+ ions in the presence of SCFA (50 mmol x l(-1)) but not in the absence of SCFA. However, in the in vitro experiments, the addition of 60 microM ethoxyzolamide had no significant effect on Jnet Ca2+. A reduction in pH of the intraruminal buffer in vivo from 6.8 to 5.4 led to significant increases in the net absorption rates of Ca2+ and Mg2+ ions, an effect which was duplicated for Ca2+ in preliminary in vitro experiments in which the pH of the mucosal buffer was reduced from 7.4 to 5.4. This stimulatory effect was confined to Jms Ca2+ and Jnet Ca2+. Ussing chambers were also used to demonstrate that Jnet Ca2+ was reduced by a high transmural potential difference (PD), caused by voltage clamping, independently of the mucosal K+ concentration. Both unidirectional Ca2+ fluxes consisted of a PD-dependent and a K+-insensitive PD-independent component. The latter may be represented by a Ca2+/ 2H+ antiporter. It is postulated that SCFA, and to a lesser extent H2CO3, can stimulate Jms Ca2+ by activation of an apical Ca2+/2H+ antiporter through the provision of protons within the ruminal epithelial cell. A mild reduction in ruminal pH may also lead to a similar stimulation of this putative electroneutral exchange.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11192264&dopt=Abstract

Basic Res Cardiol. 2000 Dec;95(6):457-65.
Brief preconditioning ischemia alters diacylglycerol content and composition in rabbit heart.

Gysembergh A, Zakaroff-Girard A, Loufoua J, Meunier L, Andre-Fouet X, Lagarde M, Prigent AF, Ovize M.

Laboratoire de Physiologie Lyon-Nord, Faculte de Medecine Lyon Nord, Universite Claude Bernard Lyon I, France.

In order to give further insight into the potential role of PKC in the beneficial effects of ischemic preconditioning, we have characterized the production of diacylglycerol, the endogenous activator of PKC, and its molecular species composition in ischemic control and preconditioned hearts. Preconditioning was induced by 1 cycle of 5 min of ischemia followed by 5 min of reperfusion. In control and preconditioned groups, hearts were harvested under deep anesthesia at baseline (preischemia) and at 2, 5 and 10 min into the sustained coronary artery occlusion, i.e., preceding myocyte death. Diacylglycerol content and fatty acid composition were analyzed by thin-layer chromatography (TLC) and high-performance liquid chromatography (HPLC), respectively. Myocardial diacylglycerol content was increased at 2 min into the sustained ischemia in the control group (481 +/- 34 vs 292 +/- 64 ng x mg(-1) at baseline; p < 0.05), but was comparable to the baseline value at 5 and 10 min. In the preconditioned group, diacylglycerol production remained unchanged throughout the 10-min test ischemia (317 +/- 17 at 2 min vs 312 +/- 38 ng x mg(-1) at baseline; p = NS). A detailed analysis of the molecular species composition at the time of 2 min revealed a reduced contribution of phosphatidylinositol to diacylglycerol production in preconditioned myocardium (global correlation coefficient 0.57 vs 0.66 in control myocardium) with a trend toward an enrichment of diacylglycerol composition with some species originating from phosphatidylcholine. Thus, our study revealed that brief preconditioning ischemia: (1) prevents the increase of diacylglycerol content in the early minutes of the sustained ischemia, and (2) emphasizes the contribution of phosphatidylcholine in diacylglycerol formation to the detriment of that of phosphatidylinositol.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11192366&dopt=Abstract

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