AIM: Chitinase-3-like protein 1 (CHI3L1) is involved in tissue remodelling and inflammatory processes. Plasma levels are elevated in patients with insulin resistance and T2DM. We recently showed that CHI3L1 and its receptor protease-activated receptor 2 (PAR-2) are expressed in skeletal muscle. Activation of PAR-2 by CHI3L1 protects against TNF-α-induced inflammation and insulin resistance. However, the effect of exercise on CHI3L1 and PAR-2 signalling remains unknown. The aim of this work was to study the impact of exercise on CHI3L1 production and the effect of CHI3L1/PAR-2 signalling on skeletal muscle growth and repair. METHODS: Three human exercise studies were used to measure CHI3L1 plasma levels (n = 32). In addition, muscle and adipose tissue CHI3L1 mRNA expression was measured in response to acute and long-term exercise (n = 24). Primary human skeletal muscle cells were differentiated in vitro, and electrical pulse stimulation was applied. In addition, myoblasts were incubated with CHI3L1 protein and activation of MAP kinase signalling as well as proliferation was measured. RESULTS: Circulating CHI3L1 levels and muscle CHI3L1 mRNA were increased after acute exercise. In addition, CHI3L1 mRNA expression as well as CHI3L1 secretion was enhanced in electrically stimulated cultured myotubes. Incubation of cultured human myoblasts with CHI3L1 protein leads to a strong activation of p44/42, p38 MAPK and Akt as well as enhanced myoblast proliferation. CONCLUSION: Our findings suggest that CHI3L1 is induced by acute exercise and that CHI3L1/PAR-2 signalling activates myocyte proliferation, which is important for restructuring of skeletal muscle in the response to exercise training.
- MeSH
- cvičení fyziologie MeSH
- dospělí MeSH
- kosterní svaly metabolismus MeSH
- kvantitativní polymerázová řetězová reakce MeSH
- lidé středního věku MeSH
- lidé MeSH
- messenger RNA analýza MeSH
- mladý dospělý MeSH
- proliferace buněk fyziologie MeSH
- protein CHI3L1 metabolismus MeSH
- senioři MeSH
- signální transdukce fyziologie MeSH
- svalové buňky metabolismus MeSH
- Check Tag
- dospělí MeSH
- lidé středního věku MeSH
- lidé MeSH
- mladý dospělý MeSH
- mužské pohlaví MeSH
- senioři MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
- MeSH
- dietní tuky farmakologie MeSH
- finanční podpora výzkumu jako téma MeSH
- hypolipidemika farmakologie MeSH
- krysa rodu rattus MeSH
- leptin antagonisté a inhibitory MeSH
- omega-3 mastné kyseliny farmakologie MeSH
- peroxidace lipidů účinky záření MeSH
- regulace genové exprese genetika účinky záření MeSH
- triglyceridy antagonisté a inhibitory biosyntéza MeSH
- Check Tag
- krysa rodu rattus MeSH
- mužské pohlaví MeSH
- MeSH
- hypertriglyceridemie diagnóza etiologie MeSH
- krysa rodu rattus MeSH
- leptin krev MeSH
- mastné kyseliny krev MeSH
- modely nemocí na zvířatech MeSH
- peroxidace lipidů MeSH
- potkani Wistar MeSH
- triglyceridy krev MeSH
- zvířata MeSH
- Check Tag
- krysa rodu rattus MeSH
- zvířata MeSH
- Publikační typ
- kongresy MeSH
- srovnávací studie MeSH
- MeSH
- exprese genu MeSH
- hypertriglyceridemie MeSH
- inzulinová rezistence MeSH
- krevní proteiny MeSH
- krysa rodu rattus MeSH
- proteiny metabolismus MeSH
- tuková tkáň MeSH
- Check Tag
- krysa rodu rattus MeSH
- Publikační typ
- kongresy MeSH
