RAB3GAP2 is a regulator of skeletal muscle endothelial cell proliferation and associated with capillary-to-fiber ratio

Ström, K, Oskolkov, N, Karaderi, T, Kalamajski, S, Mir, BA, Ekström, O, Miyamoto-Mikami, E, Ladenvall, C, Kakulidis, E, Reid, S, Dutius Andersson, A-M, Kryvokhyzha, D, Zhang, E, Fadista, J, Thangam, M, Iemitsu, M, Semenova, EA, Larin, AK, Sultanov, RI, Babalyan, KA et al (2026) RAB3GAP2 is a regulator of skeletal muscle endothelial cell proliferation and associated with capillary-to-fiber ratio. Cell reports, 45 (2). ISSN 2639-1856

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Abstract

Skeletal muscle capillary density is correlated with physical performance and whole-body metabolic properties. Thus, we performed a genome-wide association study of skeletal muscle capillary-to-fiber ratio (C:F) (n = 603 males) and found that the rs115660502 G allele was associated (p < 5 × 10^-8) with increased C:F and reduced skeletal muscle expression of RAB3 GTPase-activating non-catalytic protein subunit 2 (RAB3GAP2). The capillary-increasing G allele was more prevalent in elite endurance athletes than in power athletes and non-athlete controls in two independent cohorts. Low-muscle-expressing RAB3GAP2 expression quantitative trait locus (eQTL) alleles were associated with muscle damage in athletes. In healthy individuals, RAB3GAP2 expression was reduced by high-intensity intermittent training. RAB3GAP2 protein was not uniformly expressed in muscle but predominantly expressed in the endothelium and capillaries. RAB3GAP2 expression was lower in endurance compared with power athletes and was negatively associated with type I (oxidative) muscle fiber density. Experimental reduction of RAB3GAP2 in human endothelial cells led to (1) increased proliferation and tube formation in vitro, (2) regulation of secreted factors (e.g., CD70 and TNC) promoting angiogenesis and T cell activation, and (3) increased in vivo endothelial cell density in mice. RAB3GAP2 expression in skeletal muscle was negatively correlated with exercise-induced release of TNC in vivo in humans. In conclusion, RAB3GAP2 is expressed in the microvascular endothelium and is suggested to be a negative regulator of angiogenesis through a decrease in endothelial cell proliferation, possibly mediated by RAB18, with its low-expressing variant associated with higher muscle C:F and elite endurance performance.

Item Type:	Article
Uncontrolled Keywords:	CHARGE Hemostasis Working Group; CP: genomics; CP: metabolism; RAB18; RAB3 GTPase-activating non-catalytic protein subunit 2; RAB3GAP2; angiogenesis; capillary density; elite athletes; exercise; genetics; microvascular endothelium; skeletal muscle; 0601 Biochemistry and Cell Biology; 1116 Medical Physiology; 31 Biological sciences
Subjects:	Q Science > QP Physiology R Medicine > RC Internal medicine > RC1200 Sports Medicine
Divisions:	Sport and Exercise Sciences
Publisher:	Elsevier BV
Date of acceptance:	10 January 2026
Date of first compliant Open Access:	16 February 2026
Date Deposited:	16 Feb 2026 13:48
Last Modified:	16 Feb 2026 13:48
DOI or ID number:	10.1016/j.celrep.2026.116961
URI:	https://researchonline.ljmu.ac.uk/id/eprint/28107

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