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Ultrastructural alterations in cardiac muscle of diabetic BB Wistar rats

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Summary

The cardiac muscle of BB Wistar rats suffering from diabetes for 8 and 16 weeks (8-Wk and 16-Wk of DM) were examined by light and electron microscopy. The diabetic rats were kept alive by injections of small doses of insulin and exhibited severe hyperglycaemia, glycosuria and weight loss. The heart/body weight ratio of all diabetic groups was greater than that of age matched controls. Over the experimental period, the left ventricular myocardium of the diabetic BB rats sustained damage that was progressively more serious with the duration of the diabetic state. In BB rats after 8-wk of diabetes the myocardium contained large numbers of lipid droplets and glycogen granules around mitochondria which showed patchy swelling, and slight loss of myofilaments. Disruption of mitochondrial membranes and extensive loss of myofilaments were seen in rats diabetic for 16 wk. In addition, dilatation of the sarcoplasmic reticulum-transverse tubular system, formation of a contraction band and myelin bodies and widening of the intercellular space at the fasciae adherens of the intercalated disc were characteristically observed in BB rats after 16-wk of diabetes. However, there were no evident alterations in the capillaries of any diabetic BB rats. Morphometric analyses showed the volume percentage of myofibrils in diabetic rats to be significantly decreased when compared with controls. The loss of myofibrillar elements may be a primary damage induced by insulin deficiency. The formation of contraction bands suggests Ca2+ overload caused by diabetic metabolic disturbances.

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Authors and Affiliations

  1. The 3rd Department of Internal Medicine, Tohoku University School of Medicine, 980, Sendai, Japan

    Yen-Chung Hsiao, Ken-ichi Suzuki & Takayoshi Toyota

  2. 2nd Department of Anatomy, Tohoku University School of Medicine, 980, Sendai, Japan

    Hiroshi Abe

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  1. Yen-Chung Hsiao
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  2. Ken-ichi Suzuki
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  3. Hiroshi Abe
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  4. Takayoshi Toyota
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Hsiao, YC., Suzuki, Ki., Abe, H. et al. Ultrastructural alterations in cardiac muscle of diabetic BB Wistar rats. Vichows Archiv A Pathol Anat 411, 45–52 (1987). https://doi.org/10.1007/BF00734513

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