A low-protein diet supplemented with ketoacids plays a more protective role against oxidative stress of rat kidney tissue with 5/6 nephrectomy than a low-protein diet alone.
Dietary protein restriction is one major therapy in chronic kidney disease (CKD), and ketoacids have been evaluated in CKD patients during restricted-protein diets. The objective of the present study was to compare the efficacy of a low-protein diet supplemented with ketoacids (LPD+KA) and a low-protein diet alone (LPD) in halting the development of renal lesions in CKD. 5/6 Nephrectomy Sprague-Dawley rats were randomly divided into three groups, and fed with either 22 % protein (normal-protein diet; NPD), 6 % protein (LPD) or 5 % protein plus 1 % ketoacids (LPD+KA) for 24 weeks. Sham-operated rats were used as controls. Each 5/6 nephrectomy group included fifteen rats and the control group included twelve rats. Proteinuria, decreased renal function, glomerular sclerosis and tubulointerstitial fibrosis were found in the remnant kidneys of the NPD group. Protein restriction ameliorated these changes, and the effect was more obvious in the LPD+KA group after 5/6 nephrectomy. Lower body weight and serum albumin levels were found in the LPD group, indicating protein malnutrition. Lipid and protein oxidative products were significantly increased in the LPD group compared with the LPD+KA group. These findings indicate that a LPD supplemented with ketoacids is more effective than a LPD alone in protecting the function of remnant kidneys from progressive injury, which may be mediated by ketoacids ameliorating protein malnutrition and oxidative stress injury in remnant kidney tissue.
Gao
Xiang
X
Department of Medicine, Kidney Institute of PLA, Changzheng Hospital, Second Military Medical University, Shanghai 200003, People's Republic of China.
Wu
Jianxiang
J
Dong
Zheyi
Z
Hua
Can
C
Hu
Huimin
H
Mei
Changlin
C
D000818:Animals; D000975:Antioxidants / Q000494:pharmacology / Q000627:therapeutic use*; D001835:Body Weight / Q000187:drug effects; D018753:Diet, Protein-Restricted; D004044:Dietary Proteins / Q000378:metabolism; D019587:Dietary Supplements; D005355:Fibrosis / Q000517:prevention & control; D007651:Keto Acids / Q000494:pharmacology / Q000627:therapeutic use*; D007668:Kidney / Q000187:drug effects* / Q000473:pathology / Q000503:physiopathology; D050356:Lipid Metabolism / Q000187:drug effects; D008297:Male; D009392:Nephrectomy; D018384:Oxidative Stress / Q000187:drug effects*; D011488:Protein Deficiency / Q000178:diet therapy; D011507:Proteinuria / Q000517:prevention & control; D011897:Random Allocation; D051381:Rats; D017207:Rats, Sprague-Dawley; D051436:Renal Insufficiency, Chronic / Q000178:diet therapy* / Q000473:pathology; D012598:Sclerosis / Q000517:prevention & control; D012709:Serum Albumin / Q000378:metabolism
D000975:Antioxidants; D004044:Dietary Proteins; D007651:Keto Acids; D012709:Serum Albumin