Abstract
The hyperglycaemia and oxidative stress, that occur in diabetes mellitus, cause impairment of membrane functions in cardiomyocytes. Also reduced sensitivity to Ca-overload was reported in diabetic hearts (D). This enhanced calcium resistance is based on remodelling of the sarcolemmal membranes (SL) with down-regulated, but from the point of view of kinetics relatively well preserved Na,K-ATPase and abnormal Mg- and Ca-ATPase (Mg/Ca-ATPase) activities. It was hypothesised that in these changes may also participate the non-enzymatic glycation of proteins (NEG) and the related free radical formation (FRF), that decrease the membrane fluidity (SLMF), which is in reversal relationship to the fluorescence anisotropy (D 0.235 ± 0.022; controls (C) 0.185 ± 0.009; p < 0.001). In order to check the true role of SLMF in hearts of the diabetic rats (streptozotocin, single dose, 45 mg/kg i.v.) animals were treated in a special regimen with resorcylidene aminoguanidine (RAG, 4 mg/kg i.m.). The treatment with RAG eliminated completely the diabetes-induced decrease in the SLMF (C 0.185 ± 0.009; D + RAG 0.167 ± 0.013; p < 0.001) as well as in NEG (fructosamine μg.mg-1 of protein: C 2.68 ± 0.14; D 4.48 ± 0.85; D + RAG 2.57 ± 0.14; p < 0.001), and FRF in the SL (malondialdehyde: C 5.3 ± 0.3; D 8.63 ± 0.2; D + RAG 5.61 ± 0.53 μmol.g-1; p < 0.05). Nevertheless, the SL ATPase activity in diabetic animals was not considerably influenced by RAG (increase in D + RAG vs. D 3.3%, p > 0.05). On the other hand, RAG increased considerably the vulnerability of the diabetic heart to overload with external Ca2+ (C 100% of hearts failed, D 83.3%, D + RAG 46.7% of hearts survived). So we may conclude, that: (i) The NEG and FRF caused alterations in SLMF, that accompanied the diabetes-induced remodelling of SL, also seem to participate in the protection of diabetic heart against Ca2+-overload; (ii) Although, the changes in SLMF were shown to influence considerably the ATPase activities in cells of diverse tissues, they seem to be little responsible for changes in ATPases-mediated processes in the SL of chronic diabetic hearts. (Mol Cell Biochem 249: 175–182, 2003)
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Ziegelhöffer-Mihalovičová, B., Waczulíková, I., Šikurová, L., Styk, J., Čársky, J., Ziegelhöffer, A. (2003). Remodelling of the sarcolemma in diabetic rat hearts: The role of membrane fluidity. In: Gilchrist, J.S.C., Tappia, P.S., Netticadan, T. (eds) Biochemistry of Diabetes and Atherosclerosis. Developments in Molecular and Cellular Biochemistry, vol 42. Springer, Boston, MA. https://doi.org/10.1007/978-1-4419-9236-9_22
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