Effects of dietary cysteine on blood sulfur amino acid, glutathione, and malondialdehyde concentrations in cats

Martin J. Fettman From the Departments of Pathology (Fettman, Bedwell, Hamar) and Clinical Sciences (Valerius, Ogilvie, Richardson, Walton), College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO 80523-1671.

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Karina D. Valerius From the Departments of Pathology (Fettman, Bedwell, Hamar) and Clinical Sciences (Valerius, Ogilvie, Richardson, Walton), College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO 80523-1671.

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Gregory K. Ogilvie From the Departments of Pathology (Fettman, Bedwell, Hamar) and Clinical Sciences (Valerius, Ogilvie, Richardson, Walton), College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO 80523-1671.

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Cathy L. Bedwell From the Departments of Pathology (Fettman, Bedwell, Hamar) and Clinical Sciences (Valerius, Ogilvie, Richardson, Walton), College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO 80523-1671.

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Kristi L. Richardson From the Departments of Pathology (Fettman, Bedwell, Hamar) and Clinical Sciences (Valerius, Ogilvie, Richardson, Walton), College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO 80523-1671.

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Judy A. Walton From the Departments of Pathology (Fettman, Bedwell, Hamar) and Clinical Sciences (Valerius, Ogilvie, Richardson, Walton), College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO 80523-1671.

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Dwayne W. Hamar From the Departments of Pathology (Fettman, Bedwell, Hamar) and Clinical Sciences (Valerius, Ogilvie, Richardson, Walton), College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO 80523-1671.

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Abstract

Objective

To determine effects of dietary cysteine on blood sulfur amino acids (SAA), reduced glutathione (GSH), oxidized glutathione (GSSG), and malondialdehyde (MDA) concentrations in cats.

Animals

12 healthy adult cats.

Procedure

Cats were fed diets with a nominal (0.50 g/100 g dry matter [DM]), moderate (1.00 g/100 g DM), or high (1.50 g/100 g DM) cysteine content in a 3 × 3 Latin square design with blocks of 8 weeks’ duration. Venous blood samples were collected after each diet had been fed for 4 and 8 weeks, and a CBC and serum biochemical analyses were performed; poikilocyte, reticulocyte, and Heinz body counts were determined; and MDA, GSH, GSSG, and SAA concentrations were measured.

Results

Blood cysteine and MDA concentrations were not significantly affected by dietary cysteine content. Blood methionine, homocysteine, and GSSG concentrations were significantly increased when cats consumed the high cysteine content diet but not when they consumed the moderate cysteine content diet, compared with concentrations obtained when cats consumed the nominal cysteine content diet. Blood GSH concentrations were significantly increased when cats consumed the moderate or high cysteine content diet.

Conclusions

Increased dietary cysteine content promotes higher blood methionine, homocysteine, GSH, and GSSG concentrations in healthy cats.

Clinical Relevance

Supplemental dietary cysteine may be indicated to promote glutathione synthesis and ameliorate adverse effects of oxidative damage induced by disease or drugs. (Am J Vet Res 1999;60:328–333)

Abstract

Objective

To determine effects of dietary cysteine on blood sulfur amino acids (SAA), reduced glutathione (GSH), oxidized glutathione (GSSG), and malondialdehyde (MDA) concentrations in cats.

Animals

12 healthy adult cats.

Procedure

Cats were fed diets with a nominal (0.50 g/100 g dry matter [DM]), moderate (1.00 g/100 g DM), or high (1.50 g/100 g DM) cysteine content in a 3 × 3 Latin square design with blocks of 8 weeks’ duration. Venous blood samples were collected after each diet had been fed for 4 and 8 weeks, and a CBC and serum biochemical analyses were performed; poikilocyte, reticulocyte, and Heinz body counts were determined; and MDA, GSH, GSSG, and SAA concentrations were measured.

Results

Blood cysteine and MDA concentrations were not significantly affected by dietary cysteine content. Blood methionine, homocysteine, and GSSG concentrations were significantly increased when cats consumed the high cysteine content diet but not when they consumed the moderate cysteine content diet, compared with concentrations obtained when cats consumed the nominal cysteine content diet. Blood GSH concentrations were significantly increased when cats consumed the moderate or high cysteine content diet.

Conclusions

Increased dietary cysteine content promotes higher blood methionine, homocysteine, GSH, and GSSG concentrations in healthy cats.

Clinical Relevance

Supplemental dietary cysteine may be indicated to promote glutathione synthesis and ameliorate adverse effects of oxidative damage induced by disease or drugs. (Am J Vet Res 1999;60:328–333)

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