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Preclinical studies show that stimulation of the soluble guanylate cyclase (sGC)-cGMP pathway attenuates muscle mass loss and prevents cigarette smoke-induced oxidative stress, indicating that pharmacological activation of the guanylyl cyclase pathway in COPD may provide a beneficial therapeutic strategy that reaches beyond the lung. In this study, conducted in an animal model of COPD, we first set out to assess the effect of cigarette smoke (CS) on biomarkers of muscle fatigue, such as protein degradation and its transcriptional regulation, in two types of muscles with different energy demands, i.e., the diaphragm and the gastrocnemius muscle of the limbs. Second, we evaluated the administration of an sGC stimulator on these markers to study the potential efficacy of such treatment in the recovery of skeletal muscle function. Exposure to CS led to weight loss, which was associated in the gastrocnemius with increased levels of proteolytic markers of muscle atrophy (MURF-1, Atrogin-1, proteasome C8 subunit 20 s, and total protein ubiquitination), whereas the size of fast-twitch muscle fibers decreased significantly. Long-term treatment with the sGC stimulator BAY 41-2272 resulted in a significant reduction in gastrocnemius levels of the aforementioned proteolytic markers, concomitant with a weight recovery and increased cGMP levels. Remarkably, levels of some of the analyzed biomarkers differed between respiratory and limb muscles. In conclusion, targeting sGC might exert beneficial effects on muscle alterations in patients with COPD. <\/jats:p>","DOI":"10.1152\/ajplung.00258.2022","type":"journal-article","created":{"date-parts":[[2023,3,7]],"date-time":"2023-03-07T18:21:08Z","timestamp":1678213268000},"page":"L677-L693","update-policy":"https:\/\/doi.org\/10.1152\/aps-crossmark-policy","source":"Crossref","is-referenced-by-count":5,"title":["Atrophy signaling pathways in respiratory and limb muscles of guinea pigs exposed to chronic cigarette smoke: role of soluble guanylate cyclase stimulation"],"prefix":"10.1152","volume":"324","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9793-9433","authenticated-orcid":false,"given":"V\u00edctor Ivo","family":"Peinado","sequence":"first","affiliation":[{"name":"Department of Pulmonary Medicine, Hospital Cl\u00ednic, Institut d\u2019Investigacions Biom\u00e8diques August Pi i Sunyer (IDIBAPS), University of Barcelona, Barcelona, Spain"},{"name":"Department of 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