Increased skeletal muscle capillarization enhances insulin sensitivity

Thorbjörn Åkerström; Lasse Laub; Kenneth Vedel; Christian Lehn Brand; Bente Klarlund Pedersen; Anna Kaufmann Lindqvist; Jørgen Wojtaszewski; Ylva Hellsten

doi:10.1152/ajpendo.00020.2014

Increased skeletal muscle capillarization enhances insulin sensitivity

Thorbjörn Åkerström, Lasse Laub, Kenneth Vedel, Christian Lehn Brand, Bente Klarlund Pedersen, Anna Kaufmann Lindqvist, Jørgen Wojtaszewski, Ylva Hellsten

30 Citations (Scopus)

Abstract

Increased skeletal muscle capillarization is associated with improved glucose tolerance and insulin sensitivity. However, a possible causal relationship has not previously been identified. We therefore investigated whether increased skeletal muscle capillarization increases insulin sensitivity. Skeletal muscle specific angiogenesis was induced by adding the α1-adrenergic receptor antagonist Prazosin to the drinking water of Sprague Dawley rats (n=33) while 34 rats served as controls. Insulin sensitivity was measured ≥40 h after termination of the 3-week Prazosin treatment, which ensured that Prazosin was cleared from the blood stream. Whole-body insulin sensitivity was measured in conscious, unrestrained rats by hyperinsulinemic euglycemic clamp. Tissue specific insulin sensitivity was assessed by administration of 2-deoxy-[(3)H]-Glucose during the plateau phase of the clamp. Whole-body insulin sensitivity increased by ~24% and insulin-stimulated skeletal muscle 2-deoxy-[(3)H]-Glucose disposal increased by ~30% concomitant with a ~20% increase in skeletal muscle capillarization. Adipose tissue insulin sensitivity was not affected by the treatment. Insulin-stimulated muscle glucose uptake was enhanced independent of improvements in skeletal muscle insulin signaling to glucose uptake and glycogen synthesis, suggesting that the improvement in insulin-stimulated muscle glucose uptake could be due to improved diffusion conditions for glucose in the muscle. The Prazosin treatment did not affect the rats on any other parameters measured. We conclude that an increase in skeletal muscle capillarization is associated with increased insulin sensitivity. These data point towards the importance of increasing skeletal muscle capillarization for prevention or treatment of type 2 diabetes.

Original language	English
Journal	American Journal of Physiology: Endocrinology and Metabolism
Volume	307
Issue number	12
Pages (from-to)	E1105-E1116
Number of pages	12
ISSN	0193-1849
DOIs	https://doi.org/10.1152/ajpendo.00020.2014
Publication status	Published - 15 Dec 2014

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title = "Increased skeletal muscle capillarization enhances insulin sensitivity",

abstract = "Increased skeletal muscle capillarization is associated with improved glucose tolerance and insulin sensitivity. However, a possible causal relationship has not previously been identified. We therefore investigated whether increased skeletal muscle capillarization increases insulin sensitivity. Skeletal muscle specific angiogenesis was induced by adding the α1-adrenergic receptor antagonist Prazosin to the drinking water of Sprague Dawley rats (n=33) while 34 rats served as controls. Insulin sensitivity was measured ≥40 h after termination of the 3-week Prazosin treatment, which ensured that Prazosin was cleared from the blood stream. Whole-body insulin sensitivity was measured in conscious, unrestrained rats by hyperinsulinemic euglycemic clamp. Tissue specific insulin sensitivity was assessed by administration of 2-deoxy-[(3)H]-Glucose during the plateau phase of the clamp. Whole-body insulin sensitivity increased by ~24% and insulin-stimulated skeletal muscle 2-deoxy-[(3)H]-Glucose disposal increased by ~30% concomitant with a ~20% increase in skeletal muscle capillarization. Adipose tissue insulin sensitivity was not affected by the treatment. Insulin-stimulated muscle glucose uptake was enhanced independent of improvements in skeletal muscle insulin signaling to glucose uptake and glycogen synthesis, suggesting that the improvement in insulin-stimulated muscle glucose uptake could be due to improved diffusion conditions for glucose in the muscle. The Prazosin treatment did not affect the rats on any other parameters measured. We conclude that an increase in skeletal muscle capillarization is associated with increased insulin sensitivity. These data point towards the importance of increasing skeletal muscle capillarization for prevention or treatment of type 2 diabetes.",

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T1 - Increased skeletal muscle capillarization enhances insulin sensitivity

AU - Åkerström, Thorbjörn

AU - Laub, Lasse

AU - Vedel, Kenneth

AU - Brand, Christian Lehn

AU - Pedersen, Bente Klarlund

AU - Kaufmann Lindqvist, Anna

AU - Wojtaszewski, Jørgen

AU - Hellsten, Ylva

N1 - CURIS 2014 NEXS 368

PY - 2014/12/15

Y1 - 2014/12/15

N2 - Increased skeletal muscle capillarization is associated with improved glucose tolerance and insulin sensitivity. However, a possible causal relationship has not previously been identified. We therefore investigated whether increased skeletal muscle capillarization increases insulin sensitivity. Skeletal muscle specific angiogenesis was induced by adding the α1-adrenergic receptor antagonist Prazosin to the drinking water of Sprague Dawley rats (n=33) while 34 rats served as controls. Insulin sensitivity was measured ≥40 h after termination of the 3-week Prazosin treatment, which ensured that Prazosin was cleared from the blood stream. Whole-body insulin sensitivity was measured in conscious, unrestrained rats by hyperinsulinemic euglycemic clamp. Tissue specific insulin sensitivity was assessed by administration of 2-deoxy-[(3)H]-Glucose during the plateau phase of the clamp. Whole-body insulin sensitivity increased by ~24% and insulin-stimulated skeletal muscle 2-deoxy-[(3)H]-Glucose disposal increased by ~30% concomitant with a ~20% increase in skeletal muscle capillarization. Adipose tissue insulin sensitivity was not affected by the treatment. Insulin-stimulated muscle glucose uptake was enhanced independent of improvements in skeletal muscle insulin signaling to glucose uptake and glycogen synthesis, suggesting that the improvement in insulin-stimulated muscle glucose uptake could be due to improved diffusion conditions for glucose in the muscle. The Prazosin treatment did not affect the rats on any other parameters measured. We conclude that an increase in skeletal muscle capillarization is associated with increased insulin sensitivity. These data point towards the importance of increasing skeletal muscle capillarization for prevention or treatment of type 2 diabetes.

AB - Increased skeletal muscle capillarization is associated with improved glucose tolerance and insulin sensitivity. However, a possible causal relationship has not previously been identified. We therefore investigated whether increased skeletal muscle capillarization increases insulin sensitivity. Skeletal muscle specific angiogenesis was induced by adding the α1-adrenergic receptor antagonist Prazosin to the drinking water of Sprague Dawley rats (n=33) while 34 rats served as controls. Insulin sensitivity was measured ≥40 h after termination of the 3-week Prazosin treatment, which ensured that Prazosin was cleared from the blood stream. Whole-body insulin sensitivity was measured in conscious, unrestrained rats by hyperinsulinemic euglycemic clamp. Tissue specific insulin sensitivity was assessed by administration of 2-deoxy-[(3)H]-Glucose during the plateau phase of the clamp. Whole-body insulin sensitivity increased by ~24% and insulin-stimulated skeletal muscle 2-deoxy-[(3)H]-Glucose disposal increased by ~30% concomitant with a ~20% increase in skeletal muscle capillarization. Adipose tissue insulin sensitivity was not affected by the treatment. Insulin-stimulated muscle glucose uptake was enhanced independent of improvements in skeletal muscle insulin signaling to glucose uptake and glycogen synthesis, suggesting that the improvement in insulin-stimulated muscle glucose uptake could be due to improved diffusion conditions for glucose in the muscle. The Prazosin treatment did not affect the rats on any other parameters measured. We conclude that an increase in skeletal muscle capillarization is associated with increased insulin sensitivity. These data point towards the importance of increasing skeletal muscle capillarization for prevention or treatment of type 2 diabetes.

U2 - 10.1152/ajpendo.00020.2014

DO - 10.1152/ajpendo.00020.2014

M3 - Journal article

C2 - 25352432

SN - 0193-1849

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SP - E1105-E1116

JO - American Journal of Physiology - Endocrinology and Metabolism

JF - American Journal of Physiology - Endocrinology and Metabolism

IS - 12

ER -

Increased skeletal muscle capillarization enhances insulin sensitivity

Abstract

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