Alanyl-glutamine dipeptide does not affect hemodynamics despite a greater increase in myocardial heat shock protein 72 immunoreactivity in endotoxemic sheep
| Autor: | Jörg Meyer, Hideo A. Baba, Hans-Georg Bone, C. Schulzki, Marion Scharte, Hugo Van Aken, Christiane Goeters |
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| Rok vydání: | 2001 |
| Předmět: |
medicine.medical_specialty
Medicine (miscellaneous) Hemodynamics HSP72 Heat-Shock Proteins Biology chemistry.chemical_compound Heat shock protein Internal medicine medicine Animals Typhoid Fever Heat-Shock Proteins Nutrition and Dietetics Dipeptide Sheep Myocardium Dipeptides Endotoxemia Glutamine Blood pressure Endocrinology chemistry Shock (circulatory) Immunology Hyperdynamic circulation Immunohistochemistry medicine.symptom |
| Zdroj: | The Journal of nutrition. 131(5) |
| ISSN: | 0022-3166 |
| Popis: | The possible beneficial effect of supplemental glutamine (Gln) in critically ill patients has been suggested to be mediated by the induction of the cytoprotective heat shock proteins (HSP)32 and HSP72. There is evidence that HSP72 and HSP32 have opposite effects on the hemodynamic situation during endotoxemia. Therefore, the effect of Gln supplementation on the cardiovascular system is not clear. We investigated the effect of alanyl-Gln (Ala-Gln) dipeptide on cardiovascular function in healthy and endotoxemic sheep. Ten sheep catheterized for chronic studies received Ala-Gln 700 mg/(kg x d) [equal to 470 mg/(kg x d)Gln] on 4 consecutive days, and 10 sheep received NaCl (9 g/L) as the control solution. On d 4, four sheep of each group were killed and myocardial samples were taken for immunohistochemistry. The remaining sheep received a continuous infusion of endotoxin [Salmonella typhosa, 10 ng/(kg x min)]. Hemodynamic parameters were measured before application of Ala-Gln or the control solution, and during endotoxemia. Myocardial HSP72 immunoreactivity was determined by immunohistochemistry. After 24 h of endotoxemia, the sheep exhibited a hyperdynamic circulation. No difference was found in the hemodynamic parameters between treatment and control group. Ala-Gln treated sheep had a greater increase in myocardial HSP72 immunoreactivity compared with controls after (P < 0.05) but not before endotoxemia. In summary, Ala-Gln increased HSP72 immunoreactivity after endotoxemia, but did not alter hemodynamic parameters. Thus, Ala-Gln supplementation does not seem to aggravate the hyperdynamic circulation in endotoxemic shock. |
| Databáze: | OpenAIRE |
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