{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,7]],"date-time":"2026-09-07T18:25:31Z","timestamp":1788805531032,"version":"build-2803163510"},"reference-count":50,"publisher":"Wiley","issue":"3","license":[{"start":{"date-parts":[[2025,6,4]],"date-time":"2025-06-04T00:00:00Z","timestamp":1748995200000},"content-version":"vor","delay-in-days":3,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/100010447","name":"Deutsches Zentrum f\u00fcr Herz-Kreislaufforschung","doi-asserted-by":"publisher","id":[{"id":"10.13039\/100010447","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["J cachexia sarcopenia muscle"],"published-print":{"date-parts":[[2025,6]]},"abstract":"<jats:title>ABSTRACT<\/jats:title><jats:sec><jats:title>Background<\/jats:title><jats:p>Heart failure with preserved ejection fraction (HFpEF) is associated with exercise intolerance, accompanied by alterations in the peripheral skeletal muscle (SKM). We have recently shown that titin, a giant sarcomere protein, is hyperphosphorylated in HFpEF. MuRF1 is a muscle\u2010specific ubiquitin E3\u2010ligase that interacts with titin. Blocking this interaction via small molecules (MyoMed205) can improve muscle function and mitochondrial activity in HFpEF. This study aimed to investigate the impact of MyoMed205 on titin phosphorylation and its association with changes in muscle structure and function.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Obese ZSF1 rats with established HFpEF received rat chow with (<jats:italic>n<\/jats:italic>\u2009=\u200915) or without (<jats:italic>n<\/jats:italic>\u2009=\u200915) MyoMed205 and were compared with lean littermates (<jats:italic>n<\/jats:italic>\u2009=\u200915), serving as controls. After 12\u2009weeks, in\u00a0vitro SKM force, atrophy and titin\u2014as well as contractile protein expression\u2014were evaluated (soleus and extensor digitorum longus [EDL]). Statistical analysis was performed via multiple unpaired <jats:italic>t<\/jats:italic>\u2010test or one\u2010way ANOVA.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>In HFpEF, titin hyperphosphorylation by 13% in the EDL (<jats:italic>p<\/jats:italic>\u2009=\u20090.09) and 14% (<jats:italic>p<\/jats:italic>\u2009=\u20090.03) in the soleus muscle was evident. This hyperphosphorylation was driven in part by an increase in S11878 phosphorylation (EDL: +68%, <jats:italic>p<\/jats:italic>\u2009=\u20090.004; Sol: +23.8%, <jats:italic>p<\/jats:italic>\u2009=\u20090.03), which was linked to myofiber atrophy (<jats:italic>r<\/jats:italic>\u2009=\u2009\u22120.68, <jats:italic>p<\/jats:italic>\u2009=\u20090.006) and a decline in maximal specific muscle force (<jats:italic>r<\/jats:italic>\u2009=\u2009\u22120.54, <jats:italic>p<\/jats:italic>\u2009=\u20090.008). In the EDL, significant changes in protein expression related to atrophy (MuRF1 [+24.9%, <jats:italic>p<\/jats:italic>\u2009=\u20090.02], GDF8 [+20.6%, <jats:italic>p<\/jats:italic>\u2009=\u20090.09]) and calcium handling (slow troponin C [\u221246%, <jats:italic>p<\/jats:italic>\u2009=\u20090.02], fast troponin I [+35.8%, <jats:italic>p<\/jats:italic>\u2009=\u20090.02]) were found in HFpEF. All of the above\u2010mentioned effects in HFpEF were almost completely abolished by MyoMed205 treatment, and significantly elevated titin expression was visible (+19.7%, <jats:italic>p<\/jats:italic><jats:sub>con<\/jats:sub>\u2009=\u20090.04, <jats:italic>p<\/jats:italic><jats:sub>HFpEF<\/jats:sub>\u2009=\u20090.01).<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Titin hyperphosphorylation may negatively impact skeletal muscle integrity and function in HFpEF. MyoMed205 reduced titin hyperphosphorylation and was associated with preserved skeletal muscle function and mass. Further studies are necessary to confirm the direct role of titin hyperphosphorylation on muscle function and to evaluate the therapeutic potential of MyoMed205 in HFpEF.<\/jats:p><\/jats:sec>","DOI":"10.1002\/jcsm.13843","type":"journal-article","created":{"date-parts":[[2025,6,9]],"date-time":"2025-06-09T03:58:47Z","timestamp":1749441527000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["MyoMed205 Counteracts Titin Hyperphosphorylation and the Expression of Contraction\u2010Regulating Proteins in a Rat Model of HFpEF"],"prefix":"10.1002","volume":"16","author":[{"ORCID":"https:\/\/orcid.org\/0009-0000-8110-1943","authenticated-orcid":false,"given":"Beatrice","family":"Vahle","sequence":"first","affiliation":[{"name":"Heart Center, University Clinic, Department of Internal Medicine, Laboratory of Molecular and Experimental Cardiology University of Technology Dresden  Dresden 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