Abstract
Objectives: This study investigated the effects of glutamine (Gln) supplementation on gene expressions of inflammatory mediators and cytokines associated with T-helper cell type 17 (Th17) regulation in diabetic rats. Methods: There were one normal control group and two diabetic groups in this study. Rats in the normal control group were fed a regular chow diet. One diabetic group (DM) was fed a common semipurified diet, and the other diabetic group received a diet in which part of the casein was replaced by Gln (DM-Gln), which provided 25% of the total amino acid nitrogen for 8 wk. Diabetes was induced by an intraperitoneal injection of nicotinamide followed by streptozotocin. Rats with blood glucose levels exceeding 200 mg/dL were considered diabetic. Blood samples and blood mononuclear cells of the animals were collected at the end of the study for further analysis. Results: Gene expressions of transforming growth factor-β1 and interleukin-17A did not differ in blood mononuclear cells among the three groups. Expressions of interleukin-6, interleukin-23, monocyte chemotactic protein-1, and the receptor of the advanced glycated endproducts gene were higher in blood mononuclear cells and the ratio of reduced to oxidized glutathione was lower in erythrocytes in the DM group than in the normal control group. Messenger RNA expressions of these genes were lower, whereas the ratio of reduced to oxidized glutathione was higher in the DM-Gln group than in the DM group. Conclusion: Supplemental dietary Gln increased the antioxidant potential and downregulated the expressions of inflammatory mediators. However, Th17 might not be an important involved pathway and the regulatory effect of Gln on Th17 immune response was not obvious in this animal model.
| Original language | English |
|---|---|
| Pages (from-to) | 288-293 |
| Number of pages | 6 |
| Journal | Nutrition |
| Volume | 28 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - Mar 2012 |
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Keywords
- Diabetes
- Glutamine
- Receptor of advanced glycated endproducts
- Reduced to oxidized glutathione ratio
- Th17
ASJC Scopus subject areas
- Endocrinology, Diabetes and Metabolism
- Nutrition and Dietetics
Cite this
Effects of dietary glutamine on inflammatory mediator gene expressions in rats with streptozotocin-induced diabetes. / Tsai, Pei Hsuan; Yeh, Chui Li; Liu, Jun Jen; Chiu, Wan Chun; Yeh, Sung Ling.
In: Nutrition, Vol. 28, No. 3, 03.2012, p. 288-293.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Effects of dietary glutamine on inflammatory mediator gene expressions in rats with streptozotocin-induced diabetes
AU - Tsai, Pei Hsuan
AU - Yeh, Chui Li
AU - Liu, Jun Jen
AU - Chiu, Wan Chun
AU - Yeh, Sung Ling
PY - 2012/3
Y1 - 2012/3
N2 - Objectives: This study investigated the effects of glutamine (Gln) supplementation on gene expressions of inflammatory mediators and cytokines associated with T-helper cell type 17 (Th17) regulation in diabetic rats. Methods: There were one normal control group and two diabetic groups in this study. Rats in the normal control group were fed a regular chow diet. One diabetic group (DM) was fed a common semipurified diet, and the other diabetic group received a diet in which part of the casein was replaced by Gln (DM-Gln), which provided 25% of the total amino acid nitrogen for 8 wk. Diabetes was induced by an intraperitoneal injection of nicotinamide followed by streptozotocin. Rats with blood glucose levels exceeding 200 mg/dL were considered diabetic. Blood samples and blood mononuclear cells of the animals were collected at the end of the study for further analysis. Results: Gene expressions of transforming growth factor-β1 and interleukin-17A did not differ in blood mononuclear cells among the three groups. Expressions of interleukin-6, interleukin-23, monocyte chemotactic protein-1, and the receptor of the advanced glycated endproducts gene were higher in blood mononuclear cells and the ratio of reduced to oxidized glutathione was lower in erythrocytes in the DM group than in the normal control group. Messenger RNA expressions of these genes were lower, whereas the ratio of reduced to oxidized glutathione was higher in the DM-Gln group than in the DM group. Conclusion: Supplemental dietary Gln increased the antioxidant potential and downregulated the expressions of inflammatory mediators. However, Th17 might not be an important involved pathway and the regulatory effect of Gln on Th17 immune response was not obvious in this animal model.
AB - Objectives: This study investigated the effects of glutamine (Gln) supplementation on gene expressions of inflammatory mediators and cytokines associated with T-helper cell type 17 (Th17) regulation in diabetic rats. Methods: There were one normal control group and two diabetic groups in this study. Rats in the normal control group were fed a regular chow diet. One diabetic group (DM) was fed a common semipurified diet, and the other diabetic group received a diet in which part of the casein was replaced by Gln (DM-Gln), which provided 25% of the total amino acid nitrogen for 8 wk. Diabetes was induced by an intraperitoneal injection of nicotinamide followed by streptozotocin. Rats with blood glucose levels exceeding 200 mg/dL were considered diabetic. Blood samples and blood mononuclear cells of the animals were collected at the end of the study for further analysis. Results: Gene expressions of transforming growth factor-β1 and interleukin-17A did not differ in blood mononuclear cells among the three groups. Expressions of interleukin-6, interleukin-23, monocyte chemotactic protein-1, and the receptor of the advanced glycated endproducts gene were higher in blood mononuclear cells and the ratio of reduced to oxidized glutathione was lower in erythrocytes in the DM group than in the normal control group. Messenger RNA expressions of these genes were lower, whereas the ratio of reduced to oxidized glutathione was higher in the DM-Gln group than in the DM group. Conclusion: Supplemental dietary Gln increased the antioxidant potential and downregulated the expressions of inflammatory mediators. However, Th17 might not be an important involved pathway and the regulatory effect of Gln on Th17 immune response was not obvious in this animal model.
KW - Diabetes
KW - Glutamine
KW - Receptor of advanced glycated endproducts
KW - Reduced to oxidized glutathione ratio
KW - Th17
UR - http://www.scopus.com/inward/record.url?scp=84856482229&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84856482229&partnerID=8YFLogxK
U2 - 10.1016/j.nut.2011.06.003
DO - 10.1016/j.nut.2011.06.003
M3 - Article
VL - 28
SP - 288
EP - 293
JO - Nutrition
JF - Nutrition
SN - 0899-9007
IS - 3
ER -