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3D analysis of capillary network in skeletal muscle of obese insulin-resistant mice
- 1.0517438 - FGÚ 2020 RIV DE eng J - Journal Article
Umek, N. - Horvat, S. - Cvetko, E. - Kreft, M. - Janáček, Jiří - Kubínová, Lucie - Pintaric, T.S. - Eržen, I.
3D analysis of capillary network in skeletal muscle of obese insulin-resistant mice.
Histochemistry and Cell Biology. Roč. 152, č. 5 (2019), s. 323-331. ISSN 0948-6143. E-ISSN 1432-119X
R&D Projects: GA MŠk(CZ) LM2015062; GA MŠk(CZ) EF16_013/0001775
Research Infrastructure: Czech-BioImaging - 90062
Institutional support: RVO:67985823
Keywords : obesity * insulin resistence * capillary network * 3D analysis * skeletal muscle * fibre type
OECD category: Anatomy and morphology (plant science to be 1.6)
Impact factor: 3.418, year: 2019
Method of publishing: Limited access
In obesity, the skeletal muscle capillary network regresses and the insulin-mediated capillary recruitment is impaired. However, it has been shown that in the early stage of advanced obesity, an increased functional vascular response can partially compensate for other mechanisms of insulin resistance. The present study aimed to investigate the changes in the capillary network around individual muscle fibres during the early stage of obesity and insulin resistance in mice using 3D analysis. Capillaries and muscle fibres of the gluteus maximus muscles of seven high-fat-diet-induced obese and insulin-resistant mice and seven age-matched lean healthy mice were immunofluorescently labelled in thick transverse muscle sections. Stacks of images were acquired using confocal microscope. Capillary network characteristics were estimated by methods of quantitative image analysis. Muscle fibre typing was performed by histochemical analysis of myosin heavy chain isoforms on thin serial sections of skeletal muscle. Capillary length per muscle fibre length and capillary length per muscle fibre surface were increased by 27% and 23%, respectively, around small muscle fibres in obese mice, while there were no significant comparative differences around large fibres of obese and lean mice. Furthermore, the capillarization was larger around small compared to large fibres and there was a shift toward fast type myosin heavy chain isoforms, with no significant changes in muscle fibre diameters, tortuosity and anisotropy in obese mice. Overall, the results show that obese insulin-resistant mice have selective increase in capillarization around small predominantly intermediate muscle fibres, which is most likely related to the impaired glucose metabolism characteristic of type 2 diabetes.
Permanent Link: http://hdl.handle.net/11104/0302749
Number of the records: 1