RAB3GAP2 is a regulator of skeletal muscle endothelial cell proliferation and associated with capillary-to-fiber ratio.
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Ström Kristoffer, Oskolkov Nikolay, Karaderi Tugce, Kalamajski Sebastian, Mir Bilal A, Ekström Ola, Miyamoto-Mikami Eri, Ladenvall Claes, Kakulidis Ellen, Reid Steven, Dutius Andersson Anna-Maria, Kryvokhyzha Dmytro, Zhang Enming, Fadista Joao, Thangam Manonanthini, Iemitsu Motoyuki, Semenova Ekaterina A, Larin Andrey K, Sultanov Rinat I, Babalyan Konstantin A, Zhelankin Andrey V, Kulemin Nikolay A, Generozov Edward V, Hultström Michael, Frithiof Robert, Zeberg Hugo, Lipcsey Miklos, Larsson Anders, Mahajan Anubha, Ahlqvist Emma, Prasad Rashmi B, Prüfer Kay, CHARGE Hemostasis Working Group, Sabater-Lleal Maria, Smith Nicholas L, Dehghan Abbas, Lind Lars, McGawley Kerry, Morris Andrew P, Andersson Johan P A, Lehtovirta Mikko, Szczerbiński Łukasz, Kretowski Adam, Ahmetov Ildus I, Wang Guan, Pitsiladis Yannis, Santos-Lozano Alejandro, Lucia Alejandro, Fuku Noriyuki, Holmberg Hans-Christer, Gomez Maria F, Eriksson Karl-Fredrik, Pietras Kristian, Lindgren Cecilia M, Franks Paul W, Hansson Ola
Аннотация
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.