PapersFlow Research Brief
Muscle Physiology and Disorders
Research Guide
What is Muscle Physiology and Disorders?
Muscle Physiology and Disorders is the study of molecular mechanisms governing skeletal muscle function, regeneration, atrophy, and related pathologies, including satellite cell activity, myostatin regulation, ubiquitin ligase pathways, IGF-1/PI3K/Akt signaling, inflammatory responses to injury, and dystrophin roles in muscle maintenance and disease.
This field encompasses 87,926 works exploring muscle regeneration, skeletal muscle atrophy, satellite cells, myostatin, ubiquitin ligases, stem cells, FoxO transcription factors, dystrophin, and the IGF-1/PI3K/Akt pathway. Research identifies molecular mediators of atrophy through transcript profiling across models, revealing universal gene changes. Studies highlight mesenchymal stem cells from marrow and adipose tissue as multipotent sources capable of differentiating into muscle lineages.
Topic Hierarchy
Research Sub-Topics
Skeletal Muscle Atrophy
This sub-topic examines the molecular pathways and ubiquitin ligases driving muscle wasting in conditions like disuse, aging, and cachexia. Researchers investigate interventions targeting FoxO transcription factors and IGF-1/PI3K/Akt signaling to mitigate atrophy.
Satellite Cell Function
This area explores the activation, proliferation, and differentiation of satellite cells in muscle regeneration and repair. Studies focus on their role in stem cell therapy and response to injury or exercise.
Myostatin Regulation
Researchers study myostatin as a negative regulator of muscle growth, including its signaling via TGF-β superfamily and inhibition strategies for hypertrophy. This includes genetic models and pharmacological antagonists.
Muscle Regeneration
This sub-topic covers the cellular and molecular processes of muscle repair post-injury, involving stem cells, inflammation, and extracellular matrix remodeling. Investigations include niche interactions and regenerative therapeutics.
Dystrophin in Muscle Function
Focuses on dystrophin's role in sarcolemma stability, its deficiency in Duchenne muscular dystrophy, and gene therapy approaches. Research spans protein interactions and disease modeling.
Why It Matters
Muscle Physiology and Disorders research identifies therapeutic targets for conditions like Duchenne muscular dystrophy and atrophy from disuse or injury. Pittenger et al. (1999) demonstrated that adult human mesenchymal stem cells from marrow differentiate into muscle, supporting cell-based therapies with 20,890 citations reflecting clinical potential. Zuk et al. (2001, 2002) showed adipose-derived multipotent stem cells as accessible sources for mesodermal repair, enabling autologous treatments. Bodine et al. (2001) pinpointed ubiquitin ligases like MAFbx/atrogin-1 and MuRF1 as atrophy mediators, offering targets to block muscle loss in 3428-cited work. McPherron et al. (1997) identified myostatin as a negative regulator of muscle mass, informing genetic interventions tested in mouse models.
Reading Guide
Where to Start
"Dystrophin: The protein product of the duchenne muscular dystrophy locus" by Hoffman et al. (1987) – foundational for grasping core muscle disease mechanisms, with 4631 citations and direct link to clinical disorder.
Key Papers Explained
Pittenger et al. (1999) "Multilineage Potential of Adult Human Mesenchymal Stem Cells" establishes marrow-derived stem cells' muscle differentiation, cited 20,890 times; Zuk et al. (2001, 2002) extend this to adipose sources with 7904 and 6593 citations, broadening therapy options. Bodine et al. (2001) "Identification of Ubiquitin Ligases Required for Skeletal Muscle Atrophy" identifies atrophy mediators building on stem cell repair contexts (3428 citations), while McPherron et al. (1997) "Regulation of skeletal muscle mass in mice by a new TGF-p superfamily member" defines myostatin regulation (3921 citations) intersecting atrophy pathways.
Paper Timeline
Most-cited paper highlighted in red. Papers ordered chronologically.
Advanced Directions
Focus on intersections of IGF-1/PI3K/Akt with ubiquitin ligases and FoxO factors for atrophy prevention, as core to the 87,926 works. Explore satellite cell mechanotransduction via calcium signaling from Benavides Damm and Egli (2014). Investigate dystrophin restoration strategies informed by Hoffman et al. (1987).
Papers at a Glance
| # | Paper | Year | Venue | Citations | Open Access |
|---|---|---|---|---|---|
| 1 | Multilineage Potential of Adult Human Mesenchymal Stem Cells | 1999 | Science | 20.9K | ✕ |
| 2 | Calcium's Role in Mechanotransduction during Muscle Development | 2014 | Cellular Physiology an... | 14.5K | ✓ |
| 3 | Multilineage Cells from Human Adipose Tissue: Implications for... | 2001 | Tissue Engineering | 7.9K | ✕ |
| 4 | Human Adipose Tissue Is a Source of Multipotent Stem Cells | 2002 | Molecular Biology of t... | 6.6K | ✓ |
| 5 | Dystrophin: The protein product of the duchenne muscular dystr... | 1987 | Cell | 4.6K | ✕ |
| 6 | The Regulation of Rabbit Skeletal Muscle Contraction | 1971 | Journal of Biological ... | 4.5K | ✓ |
| 7 | Cell Shape, Cytoskeletal Tension, and RhoA Regulate Stem Cell ... | 2004 | Developmental Cell | 4.1K | ✓ |
| 8 | Regulation of skeletal muscle mass in mice by a new TGF-p supe... | 1997 | Nature | 3.9K | ✕ |
| 9 | Identification of Ubiquitin Ligases Required for Skeletal Musc... | 2001 | Science | 3.4K | ✓ |
| 10 | Expression of a single transfected cDNA converts fibroblasts t... | 1987 | Cell | 3.4K | ✕ |
Frequently Asked Questions
What role does dystrophin play in muscle function?
Dystrophin is the protein product of the Duchenne muscular dystrophy locus. Hoffman et al. (1987) identified it as essential for muscle integrity, with its absence causing dystrophy. The 4631-cited paper links dystrophin defects to muscle fiber fragility.
How do ubiquitin ligases contribute to skeletal muscle atrophy?
Bodine et al. (2001) identified ubiquitin ligases MAFbx/atrogin-1 and MuRF1 as required for atrophy via transcript profiling in multiple models. These ligases are universally upregulated during muscle wasting. The Science paper with 3428 citations establishes them as key therapeutic targets.
What is the function of myostatin in skeletal muscle mass regulation?
McPherron et al. (1997) showed myostatin, a TGF-β superfamily member, negatively regulates muscle mass in mice. Its inhibition increases muscle growth. The 3921-cited Nature study highlights myostatin as a control point for hypertrophy and atrophy.
What are satellite cells' role in muscle regeneration?
Satellite cells act as stem cells in adult muscle for regeneration. Pittenger et al. (1999) linked mesenchymal stem cells to muscle differentiation potential. The highly cited work supports their multilineage capacity including muscle.
How does calcium signaling affect muscle development?
Benavides Damm and Egli (2014) detailed calcium's role in mechanotransduction, converting mechanical forces to biochemical signals in muscle development. Calcium controls processes like contraction and growth. The 14,540-cited review emphasizes its fundamental position.
What signaling prevents skeletal muscle atrophy?
The IGF-1/PI3K/Akt pathway inhibits atrophy by countering FoxO transcription factors. Research in this cluster shows its protective effects against ubiquitin ligase upregulation. This pathway integrates nutrient and growth signals for muscle maintenance.
Open Research Questions
- ? How can ubiquitin ligases like MAFbx and MuRF1 be selectively inhibited to prevent atrophy without side effects?
- ? What precise mechanisms link IGF-1/PI3K/Akt signaling to FoxO suppression in satellite cell activation?
- ? How does dystrophin-glycoprotein complex interact with inflammatory processes during muscle injury repair?
- ? Can myostatin inhibition combined with stem cell therapies restore muscle mass in dystrophic models?
- ? What mechanotransduction pathways via calcium regulate adult muscle stem cell lineage commitment?
Recent Trends
The field maintains 87,926 works with sustained focus on molecular atrophy mechanisms, ubiquitin ligases, myostatin, and dystrophin, as no growth rate or recent preprints/news available.
High citation classics like Pittenger et al. (1999, 20,890 citations) and Benavides Damm and Egli (2014, 14,540 citations) continue dominating, indicating stable research priorities on stem cell multipotency and calcium mechanotransduction.
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