Effect of pre-germinated brown rice intake on diabetic neuropathy in streptozotocin-induced diabetic rats.
Yu, Robert K.
MetadataShow full item record
AbstractABSTRACT: BACKGROUND: To study the effects of a pre-germinated brown rice diet (PR) on diabetic neuropathy in streptozotocin (STZ)-induced diabetic rats. METHODS: The effects of a PR diet on diabetic neuropathy in STZ-induced diabetic rats were evaluated and compared with those fed brown rice (BR) or white rice (WR) diets with respect to the following parameters: blood-glucose level, motor-nerve conduction velocity (NCV), sciatic-nerve Na+/K+-ATPase activity, and serum homocysteine-thiolactonase (HTase) activity. RESULTS: Compared with diabetic rats fed BR or WR diets, those fed a PR diet demonstrated significantly lower blood-glucose levels (p < 0.001), improved NCV (1.2- and 1.3-fold higher, respectively), and increased Na+/K+-ATPase activity (1.6- and 1.7-fold higher, respectively). The PR diet was also able to normalize decreased serum homocysteine levels normally seen in diabetic rats. The increased Na+/K+-ATPase activity observed in rats fed PR diets was associated with elevations in HTase activity (r = 0.913, p < 0.001). The in vitro effect of the total lipid extract from PR bran (TLp) on the Na+/K+-ATPase and HTase activity was also examined. Incubation of homocysteine thiolactone (HT) with low-density lipoprotein (LDL) in vitro resulted in generation of HT-modified LDL, which possessed high potency to inhibit Na+/K+-ATPase activity in the sciatic nerve membrane. The inhibitory effect of HT-modified LDL on Na+/K+-ATPase activity disappeared when TLp was added to the incubation mixture. Furthermore, TLp directly activated the HTase associated with high-density lipoprotein (HDL). CONCLUSION: PR treatment shows efficacy for protecting diabetic deterioration and for improving physiological parameters of diabetic neuropathy in rats, as compared with a BR or WR diet. This effect may be induced by a mechanism whereby PR intake mitigates diabetic neuropathy by one or more factors in the total lipid fraction. The active lipid fraction is able to protect the Na+/K+-ATPase of the sciatic-nerve membrane from the toxicity of HT-modified LDL and to directly activate the HTase of HDL.
CitationNutr Metab (Lond). 2007 Nov 23; 4:25
- IGF-1 induction by acylated steryl β-glucosides found in a pre-germinated brown rice diet reduces oxidative stress in streptozotocin-induced diabetes.
- Authors: Usuki S, Tsai YY, Morikawa K, Nonaka S, Okuhara Y, Kise M, Yu RK
- Issue date: 2011
- Na,K-atpase alterations in diabetic rats: relationship with lipid metabolism and nerve physiological parameters.
- Authors: Djemli-Shipkolye A, Coste T, Raccah D, Vague P, Pieroni G, Gerbi A
- Issue date: 2001 Mar
- Effect of the aldose reductase inhibitor tolrestat on nerve conduction velocity, Na/K ATPase activity, and polyols in red blood cells, sciatic nerve, kidney cortex, and kidney medulla of diabetic rats.
- Authors: Raccah D, Coste T, Cameron NE, Dufayet D, Vague P, Hohman TC
- Issue date: 1998 May-Jun
- Captopril ameliorates the decreased Na+,K(+)-ATPase activity in the retina of streptozotocin-induced diabetic rats.
- Authors: Ottlecz A, Bensaoula T
- Issue date: 1996 Jul
- Beneficial effects of gamma linolenic acid supplementation on nerve conduction velocity, Na+, K+ ATPase activity, and membrane fatty acid composition in sciatic nerve of diabetic rats.
- Authors: Coste T, Pierlovisi M, Leonardi J, Dufayet D, Gerbi A, Lafont H, Vague P, Raccah D
- Issue date: 1999 Jul