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Related Concept Videos

Interactions Between Signaling Pathways01:19

Interactions Between Signaling Pathways

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Signaling cascades usually lack linearity. Multiple pathways interact and regulate one another, allowing cells to integrate and respond to diverse environmental stimuli.
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Cell size is a significant factor impacting cellular design, function, and fitness. There exists some internal coordination by which cells double their masses before division, thus, achieving homeostasis. Coordination between cell growth and proliferation depends on the checkpoints in between cell cycle phases. Loss of coordination or failure in the checkpoint mechanism can drive the cell to uncontrolled growth and loss of cellular function. Like dividing cells that coordinate cellular growth,...
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When a ligand binds to a cell-surface receptor, the receptor's intracellular domain changes shape, which may either activate its enzyme function or allow its binding to other molecules. The initial signal is amplified by most signal transduction pathways. This means that a single ligand molecule can activate multiple molecules of a downstream target. Proteins that relay a signal are most commonly phosphorylated at one or more sites, activating or inactivating the protein. Kinases catalyze...
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Diversity in Cell Signaling Responses01:22

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The physiological function of a cell and cellular communication are outcomes of a range of extrinsic signals, intracellular signaling pathways, and cellular responses. No two cell types express the same repertoire of signaling components. Receptors are highly selective for their cognate ligands, but once activated, they can alter multiple cellular processes such as DNA transcription, protein synthesis, and metabolic activity. 
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Master Transcription Regulators02:23

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Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a  complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...
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The TGF-β signaling pathway regulates cell growth, differentiation, adhesion, motility, and development. TGF-β ligands that induce TGF-β signaling are synthesized in their latent form. Several proteases or cell surface receptors such as integrins act upon the latent form, releasing the active ligand. There are three types of mammalian TGF-βs: (TGF-β1, TGF-β2, and TGF-β3) that bind as homodimers or heterodimers to TGF-β receptors. The TGF-β receptors...
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Related Experiment Video

Updated: Dec 15, 2025

Real Time and Repeated Measurement of Skeletal Muscle Growth in Individual Live Zebrafish Subjected to Altered Electrical Activity
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Signaling Pathways That Control Muscle Mass.

Anna Vainshtein1, Marco Sandri2,3,4,5

  • 1Craft Science Inc. Toronto, ON L4J 7S2, Canada.

International Journal of Molecular Sciences
|July 9, 2020
PubMed
Summary
This summary is machine-generated.

Skeletal muscle loss impacts health and survival. Understanding the molecular control of muscle mass is crucial for developing treatments for muscle-wasting diseases.

Keywords:
atrophyhypertrophysarcopeniaskeletal muscle

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Area of Science:

  • Biochemistry
  • Physiology
  • Molecular Biology

Background:

  • Skeletal muscle mass loss is linked to poor prognosis and increased mortality in various diseases.
  • Muscle's adaptive capacity, while beneficial, can become detrimental during atrophy.
  • Muscle atrophy is triggered by distress and influenced by nutrients and signaling molecules.

Purpose of the Study:

  • To review progress in understanding the molecular mechanisms regulating skeletal muscle mass.
  • To highlight the challenges in translating research findings to human treatments.

Main Methods:

  • Literature review of molecular mechanisms controlling muscle mass.
  • Analysis of signaling pathways involved in muscle atrophy and hypertrophy.

Main Results:

  • Muscle mass regulation involves complex transcription-dependent programs affecting protein networks and organelles.
  • Despite decades of research, a full understanding of molecular mechanisms remains elusive.
  • Challenges include poor transferability of findings from animal models to humans.

Conclusions:

  • Further research into molecular mechanisms is essential for developing effective treatments for muscle-wasting conditions.
  • Targeting muscle-specific pathways holds potential for therapeutic interventions.