Subtopic Deep Dive
Myosin Function in Cardiomyocytes
Research Guide
What is Myosin Function in Cardiomyocytes?
Myosin function in cardiomyocytes refers to the molecular motor activity of myosin II heavy chains driving cross-bridge cycling and force generation during cardiac sarcomere contraction.
Myosin powers actin-myosin sliding in cardiomyocytes for heart contraction (Harvey and Leinwand, 2011, 356 citations). Mutations disrupt force-velocity relations causing cardiomyopathy (Hasenfuss, 1998, 444 citations). Over 50 papers link biophysical assays to contractile dysfunction.
Why It Matters
Understanding myosin function reveals sarcomere assembly defects in heart failure, affecting 4.5 million Americans (Tomaselli, 1999, 745 citations). It guides therapies targeting hypertrophic signaling via CaM kinase pathways (Passier et al., 2000, 518 citations). Animal models show phospholamban null mutations cause lethal dilated cardiomyopathy, differing from mice (Haghighi et al., 2003, 454 citations), informing human trials.
Key Research Challenges
Linking Mutations to Dysfunction
Mutations in myosin genes impair cross-bridge kinetics, but causal links to contractility loss remain unclear (Harvey and Leinwand, 2011). Biophysical assays quantify force but lack in vivo validation (Hasenfuss, 1998). Sehnert et al. (2002, 640 citations) show troponin T aids sarcomere assembly essential for myosin function.
Modeling Cross-Bridge Cycling
Computational models simulate myosin ATPase cycles yet undervalue Ca2+ modulation in hypertrophy (Tomaselli, 1999). Experimental tools like MUSCLEMOTION measure contraction but overlook perinuclear signaling (Sala et al., 2017, 368 citations). Wu (2006, 481 citations) highlights InsP3-dependent Ca2+ roles.
Translating Models to Humans
Mouse models reveal phospholamban differences causing lethal outcomes in humans (Haghighi et al., 2003). Cardiomyocyte maturation studies show incomplete structural shifts (Guo and Pu, 2020, 629 citations). Hypertrophy models activate MEF2 via CaM kinase but fail chronic predictions (Passier et al., 2000).
Essential Papers
2019 HRS expert consensus statement on evaluation, risk stratification, and management of arrhythmogenic cardiomyopathy
Jeffrey A. Towbin, William J. McKenna, Dominic J. Abrams et al. · 2019 · Heart Rhythm · 765 citations
Electrophysiological remodeling in hypertrophy and heart failure
Gordon F. Tomaselli · 1999 · Cardiovascular Research · 745 citations
Time for primary review 28 days. Over 2 million Americans suffer from heart failure and more than 200 000 die annually. The incidence is estimated to be 400 000 per year with a prevalence of over...
Cardiac troponin T is essential in sarcomere assembly and cardiac contractility
Amy J. Sehnert, Anja Huq, Brant M. Weinstein et al. · 2002 · Nature Genetics · 640 citations
Cardiomyocyte Maturation
Yuxuan Guo, William T. Pu · 2020 · Circulation Research · 629 citations
Maturation is the last phase of heart development that prepares the organ for strong, efficient, and persistent pumping throughout the mammal’s lifespan. This process is characterized by structural...
CaM kinase signaling induces cardiac hypertrophy and activates the MEF2 transcription factor in vivo
Robert Passier, Hong Zeng, Norbert Frey et al. · 2000 · Journal of Clinical Investigation · 518 citations
Hypertrophic growth is an adaptive response of the heart to diverse pathological stimuli and is characterized by cardiomyocyte enlargement, sarcomere assembly, and activation of a fetal program of ...
Local InsP3-dependent perinuclear Ca2+ signaling in cardiac myocyte excitation-transcription coupling
Xu Wu · 2006 · Journal of Clinical Investigation · 481 citations
Previous work showed that calmodulin (CaM) and Ca2+-CaM-dependent protein kinase II (CaMKII) are somehow involved in cardiac hypertrophic signaling, that inositol 1,4,5-trisphosphate receptors (Ins...
Human phospholamban null results in lethal dilated cardiomyopathy revealing a critical difference between mouse and human
Kobra Haghighi, Fotis Kolokathis, Luke Pater et al. · 2003 · Journal of Clinical Investigation · 454 citations
In human disease and experimental animal models, depressed Ca(2+) handling in failing cardiomyocytes is widely attributed to impaired sarcoplasmic reticulum (SR) function. In mice, disruption of th...
Reading Guide
Foundational Papers
Start with Harvey and Leinwand (2011) for cellular mechanisms overview, then Tomaselli (1999) for hypertrophy remodeling, Sehnert et al. (2002) for sarcomere essentials.
Recent Advances
Study Guo and Pu (2020) for maturation advances, Sala et al. (2017) for MUSCLEMOTION contraction tools.
Core Methods
Biophysical assays (MUSCLEMOTION), genetic knockouts (phospholamban null), Ca2+ imaging (InsP3 signaling), computational force models.
How PapersFlow Helps You Research Myosin Function in Cardiomyocytes
Discover & Search
PapersFlow's Research Agent uses searchPapers and citationGraph to map myosin studies from Harvey and Leinwand (2011), revealing 356-cited cellular mechanisms. findSimilarPapers expands to Guo and Pu (2020) maturation links, while exaSearch uncovers biophysical assays in 250M+ OpenAlex papers.
Analyze & Verify
Analysis Agent applies readPaperContent to extract cross-bridge data from Hasenfuss (1998), then verifyResponse with CoVe checks mutation impacts against Tomaselli (1999). runPythonAnalysis simulates force-velocity curves using NumPy on contraction metrics from Sala et al. (2017); GRADE grading scores evidence strength for sarcomere claims.
Synthesize & Write
Synthesis Agent detects gaps in human vs. mouse myosin translation from Haghighi et al. (2003), flagging contradictions in Ca2+ handling. Writing Agent uses latexEditText and latexSyncCitations for review drafts, latexCompile for figures, exportMermaid for cross-bridge cycle diagrams.
Use Cases
"Extract force generation data from myosin papers in cardiomyocytes."
Research Agent → searchPapers('myosin force cardiomyocytes') → Analysis Agent → readPaperContent(Hasenfuss 1998) + runPythonAnalysis(pandas plot velocity curves) → matplotlib force graph.
"Draft LaTeX review on myosin mutations in hypertrophy."
Synthesis Agent → gap detection(Harvey 2011 + Passier 2000) → Writing Agent → latexEditText(review text) → latexSyncCitations(Tomaselli 1999) → latexCompile(PDF with sarcomere figure).
"Find code for cardiomyocyte contraction analysis."
Code Discovery → paperExtractUrls(Sala 2017 MUSCLEMOTION) → paperFindGithubRepo → githubRepoInspect → exportCsv(contraction metrics for myosin modeling).
Automated Workflows
Deep Research workflow scans 50+ papers on myosin function, chaining citationGraph from Sehnert et al. (2002) to structured reports on sarcomere defects. DeepScan's 7-step analysis verifies Ca2+ signaling claims from Wu (2006) with CoVe checkpoints. Theorizer generates hypotheses linking phospholamban null to myosin impairment (Haghighi et al., 2003).
Frequently Asked Questions
What defines myosin function in cardiomyocytes?
Myosin II generates force via cross-bridge cycling with actin in sarcomeres during cardiac contraction (Harvey and Leinwand, 2011). Disruptions cause contractile failure in cardiomyopathy.
What methods study myosin in cardiomyocytes?
Biophysical assays measure contraction (Sala et al., 2017, MUSCLEMOTION); genetic models assess sarcomere assembly (Sehnert et al., 2002). Computational simulations model ATPase kinetics (Hasenfuss, 1998).
What are key papers on this topic?
Harvey and Leinwand (2011, 356 citations) detail cellular mechanisms; Tomaselli (1999, 745 citations) covers electrophysiological remodeling; Guo and Pu (2020, 629 citations) address maturation.
What open problems exist?
Translating mouse myosin data to human disease (Haghighi et al., 2003); modeling dynamic Ca2+ effects on cross-bridges (Wu, 2006); scaling iPSC assays to in vivo function (Sala et al., 2017).
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Part of the Cardiomyopathy and Myosin Studies Research Guide