GO:0010881 regulation of cardiac muscle contraction by regulation of the release of sequestered calcium ion: Calcium Release Pathway, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0010881 describes how cardiac muscle contraction is modulated by controlling the release of calcium ions stored in the sarcoplasmic reticulum.
• The ryanodine receptor (RYR2) is the principal calcium-release channel in cardiac sarcoplasmic reticulum and is a direct target of regulatory inputs such as nitric oxide.
• The conduction pathway of the cardiac sarcoplasmic reticulum calcium-release channel can be probed with permeant and impermeant organic cations, revealing structural determinants of ion flow.
• Dysregulation of sarcoplasmic reticulum calcium release is linked to contractile dysfunction in heart disease, making this process a therapeutic target.
• Comparative studies of contraction-relaxation cycles in vascular smooth muscle highlight the specialized nature of cardiac calcium handling.
• CRISPR-based models (knockout, point mutation, knock-in, overexpression) enable causal testing of genes that regulate sarcoplasmic reticulum calcium release in cardiac muscle.
Description
GO:0010881, regulation of cardiac muscle contraction by regulation of the release of sequestered calcium ion, is a biological process that defines how the frequency, rate, or extent of cardiac muscle contraction is modulated through controlled release of calcium ions from the sarcoplasmic reticulum into the cytosol. In cardiac muscle, the sarcoplasmic reticulum is a specialized endoplasmic reticulum that sequesters calcium and releases it upon receipt of a signal relayed by T tubules from the neuromuscular junction. This process is central to excitation-contraction coupling and determines the strength and timing of each heartbeat. Researchers study GO:0010881 to understand how molecular regulators, such as nitric oxide and the ryanodine receptor, tune calcium release and thereby cardiac contractility. The conduction pathway of the cardiac sarcoplasmic reticulum calcium-release channel has been structurally probed with organic cations, providing insight into how ions permeate this channel. Because contraction-relaxation cycles in cardiac muscle are distinct from those in vascular smooth muscle, comparative studies help define cardiac-specific regulatory mechanisms. Understanding GO:0010881 is therefore essential for linking molecular calcium handling to cardiac physiology and disease.
regulation of cardiac muscle contraction by regulation of the release of sequestered calcium ion At A Glance
| GO ID | GO:0010881 |
|---|---|
| GO term | regulation of cardiac muscle contraction by regulation of the release of sequestered calcium ion |
| Ontology | biological_process |
| Synonym | none |
| Major function | Modulation of cardiac muscle contraction by controlling sarcoplasmic reticulum calcium release into the cytosol |
| Key molecular player | Ryanodine receptor (RYR2) calcium-release channel of cardiac sarcoplasmic reticulum |
| Regulatory input | Nitric oxide interacts with ryanodine receptors to modulate calcium release |
| Structural feature | Conduction pathway of the cardiac sarcoplasmic reticulum calcium-release channel probed with organic cations |
| Comparative context | Contraction-relaxation cycles in vascular smooth muscle differ from cardiac muscle |
What Is GO:0010881?
GO:0010881 is defined as any process that modulates the frequency, rate, or extent of cardiac muscle contraction via the regulation of the release of sequestered calcium ion by the sarcoplasmic reticulum into the cytosol. The sarcoplasmic reticulum is the endoplasmic reticulum of striated muscle, specialized for sequestration of calcium ions that are released upon receipt of a signal relayed by T tubules from the neuromuscular junction. In practice, this term captures the regulatory steps that control how much calcium is released from intracellular stores and how that release translates into changes in cardiac muscle contraction.
Why Is regulation of cardiac muscle contraction by regulation of the release of sequestered calcium ion Important in Cell Biology?
GO:0010881 is important because the release of sequestered calcium from the sarcoplasmic reticulum is a decisive step in cardiac muscle contraction, and its dysregulation can alter contractile performance. The ryanodine receptor channel is a direct target of regulatory molecules such as nitric oxide, linking cellular signaling to calcium release and contraction. Structural studies of the conduction pathway of the cardiac sarcoplasmic reticulum calcium-release channel reveal how ions move through the channel, which is critical for understanding both normal physiology and pathological leakage. Because cardiac muscle contraction-relaxation cycles are distinct from those in vascular smooth muscle, defining cardiac-specific regulatory mechanisms is essential for targeted therapeutic development.
• Controls the amount of calcium released from the sarcoplasmic reticulum, directly influencing cardiac contraction strength.
• Ryanodine receptor (RYR2) is the main calcium-release channel and a hub for regulatory inputs.
• Nitric oxide modulates ryanodine receptor function, linking redox signaling to cardiac calcium handling.
• The conduction pathway of the calcium-release channel determines ion permeation and can be probed with organic cations.
• Dysregulation of sarcoplasmic reticulum calcium release contributes to contractile dysfunction in heart disease.
• Cardiac calcium handling differs from vascular smooth muscle, requiring cardiac-specific investigation.
• Provides a mechanistic basis for understanding excitation-contraction coupling in the heart.
• Offers targets for pharmacological or genetic modulation of cardiac contractility.
• Enables comparative physiology studies between cardiac and smooth muscle contraction-relaxation cycles.
• Supports research into inherited or acquired cardiac conditions linked to calcium release defects.
What Happens During regulation of cardiac muscle contraction by regulation of the release of sequestered calcium ion?
Calcium sequestration in the sarcoplasmic reticulum
In simple terms: The sarcoplasmic reticulum stores calcium ions so they can be released later to trigger contraction.
The sarcoplasmic reticulum is the endoplasmic reticulum of striated muscle, specialized for the sequestration of calcium ions. This stored calcium is released upon receipt of a signal relayed by T tubules from the neuromuscular junction. The regulation of cardiac muscle contraction by regulation of the release of sequestered calcium ion depends on maintaining a ready pool of calcium within the sarcoplasmic reticulum.
Signal relay and channel opening
In simple terms: A signal from the cell surface tells the calcium store to open its channels.
Upon receipt of a signal relayed by T tubules from the neuromuscular junction, the sarcoplasmic reticulum releases sequestered calcium into the cytosol. The ryanodine receptor of cardiac sarcoplasmic reticulum is the channel responsible for this release, and its molecular interaction with nitric oxide modulates channel activity. The conduction pathway of the sheep cardiac sarcoplasmic reticulum calcium-release channel has been probed with permeant and impermeant organic cations, revealing structural features that govern ion flow.
Calcium release into the cytosol
In simple terms: Calcium floods into the cytosol, where it drives contraction.
The release of sequestered calcium ion by the sarcoplasmic reticulum into the cytosol is the central event that modulates cardiac muscle contraction. This release is regulated by molecular interactions at the ryanodine receptor, including modulation by nitric oxide. The efficiency of ion conduction through the calcium-release channel is influenced by the channel's conduction pathway, as shown by experiments with organic cations.
Modulation of contraction frequency, rate, and extent
In simple terms: How much and how often calcium is released determines how strongly and how fast the heart muscle contracts.
GO:0010881 encompasses any process that modulates the frequency, rate, or extent of cardiac muscle contraction via regulation of the release of sequestered calcium ion. Because cardiac muscle contraction-relaxation cycles are distinct from those in vascular smooth muscle, the regulatory mechanisms are tissue-specific. Factors that modify contraction-relaxation cycles in vascular smooth muscle provide a comparative framework for understanding cardiac-specific calcium release regulation.
Integration with cellular signaling
In simple terms: Signals like nitric oxide fine-tune the calcium release channel.
Nitric oxide interacts with ryanodine receptors of cardiac sarcoplasmic reticulum, providing a direct molecular mechanism for regulating calcium release. This interaction links cellular signaling pathways to the control of cardiac muscle contraction. The structural basis of ion permeation through the cardiac sarcoplasmic reticulum calcium-release channel further informs how signaling and structural changes can alter calcium flux.
Key Genes Involved in GO:0010881 regulation of cardiac muscle contraction by regulation of the release of sequestered calcium ion
The following genes and proteins are central to the regulation of cardiac muscle contraction by regulation of the release of sequestered calcium ion, based on the verified literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| RYR2 | Ryanodine receptor calcium-release channel of cardiac sarcoplasmic reticulum | Target of nitric oxide modulation; central to calcium release and contraction |
| NOS1 | Nitric oxide synthase that produces nitric oxide interacting with ryanodine receptors | Regulates ryanodine receptor activity and calcium release |
| NOS3 | Endothelial nitric oxide synthase that can modulate cardiac calcium handling | Potential regulator of ryanodine receptor function via nitric oxide |
| CALM1 | Calmodulin, a calcium-binding protein that can regulate ryanodine receptor channels | Modulates calcium-release channel activity |
| CALM2 | Calmodulin isoform involved in calcium signaling | Potential regulator of cardiac calcium release |
| CALM3 | Calmodulin isoform involved in calcium signaling | Potential regulator of cardiac calcium release |
| FKBP1A | FK506-binding protein that associates with ryanodine receptors | Modulates ryanodine receptor channel stability and calcium release |
| PRKACA | Protein kinase A catalytic subunit that can phosphorylate calcium-handling proteins | Regulates ryanodine receptor activity and calcium release |
| PRKACB | Protein kinase A catalytic subunit beta | Potential regulator of cardiac calcium release |
| PPP1CA | Protein phosphatase 1 catalytic subunit, opposes kinase action | Regulates phosphorylation state of calcium-release channel |
| ATP2A2 | SERCA2 calcium pump that refills sarcoplasmic reticulum | Determines calcium store content available for release |
| PLN | Phospholamban, regulator of SERCA2 calcium pump | Modulates sarcoplasmic reticulum calcium load and release |
| CACNA1C | Voltage-gated calcium channel that triggers calcium release | Provides trigger calcium for sarcoplasmic reticulum release |
| CACNA1D | Voltage-gated calcium channel isoform | Potential contributor to trigger calcium in cardiac cells |
| SCN5A | Sodium channel that influences membrane potential and calcium handling | Indirect regulator of calcium release via excitation-contraction coupling |
| TNNT2 | Troponin T, component of the contractile apparatus | Readout of calcium-dependent contraction |
| MYH7 | Myosin heavy chain, contractile protein | Effector of calcium-triggered contraction |
How Is regulation of cardiac muscle contraction by regulation of the release of sequestered calcium ion Regulated?
The regulation of cardiac muscle contraction by regulation of the release of sequestered calcium ion is itself modulated by molecular interactions at the ryanodine receptor, notably through nitric oxide signaling. Nitric oxide interacts with ryanodine receptors of cardiac sarcoplasmic reticulum, providing a direct regulatory input. The conduction pathway of the cardiac sarcoplasmic reticulum calcium-release channel can be probed with permeant and impermeant organic cations, indicating that structural features of the channel influence ion flow and thus regulation. Comparative studies of contraction-relaxation cycles in vascular smooth muscle highlight that regulatory mechanisms are tissue-specific and that cardiac calcium release is subject to distinct control.
regulation of cardiac muscle contraction by regulation of the release of sequestered calcium ion and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| RYR2 | Cardiac contractile dysfunction and arrhythmia linked to calcium release | Knockout or point-mutation cardiomyocyte model |
| NOS1 | Nitric oxide-mediated modulation of ryanodine receptor in heart disease | Knockout or overexpression model |
| ATP2A2 | Sarcoplasmic reticulum calcium load and contractile dysfunction | Knock-in or overexpression model |
| PLN | Regulation of SERCA2 and calcium store content | Point-mutation or knockout model |
| CACNA1C | Trigger calcium for sarcoplasmic reticulum release in cardiac disease | Knock-in or knockout model |
Cardiac contractile dysfunction
Dysregulation of sarcoplasmic reticulum calcium release can alter cardiac muscle contraction, contributing to contractile dysfunction. The interaction between nitric oxide and ryanodine receptors is a potential mechanism linking signaling abnormalities to impaired calcium release.
Arrhythmia and calcium leak
Abnormal release of sequestered calcium ion from the sarcoplasmic reticulum can disrupt the frequency and rate of cardiac muscle contraction, which may underlie arrhythmic phenotypes. Structural determinants of the calcium-release channel conduction pathway, as probed with organic cations, are relevant to understanding pathological ion flux.
Comparative vascular pathology
Factors modifying contraction-relaxation cycles in vascular smooth muscle differ from those in cardiac muscle, and understanding these differences is important for distinguishing cardiac from vascular disease mechanisms.
From regulation of cardiac muscle contraction by regulation of the release of sequestered calcium ion-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of RYR2 function alter cardiac calcium release? | RYR2 knockout cell model |
| Does a specific point mutation in RYR2 change channel conduction? | RYR2 point-mutation knock-in |
| Does nitric oxide regulation require NOS1 in cardiomyocytes? | NOS1 knockout or overexpression |
| How does ATP2A2 dosage affect sarcoplasmic reticulum calcium load? | ATP2A2 overexpression or knockout |
| Does PLN phosphorylation mimic a disease state? | PLN point-mutation knock-in |
| Can tagged RYR2 be used to track channel localization? | Tagged knock-in of RYR2 |
How to Study the regulation of cardiac muscle contraction by regulation of the release of sequestered calcium ion Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Calcium imaging | Cytosolic calcium transients | Assess sarcoplasmic reticulum calcium release in cardiomyocytes |
| Electrophysiology with organic cations | Ion conduction through calcium-release channel | Probe conduction pathway of cardiac sarcoplasmic reticulum channel |
| Nitric oxide interaction assays | Molecular interaction with ryanodine receptor | Determine regulation of calcium release by nitric oxide |
| Contraction-relaxation assays | Frequency, rate, and extent of contraction | Compare cardiac and vascular smooth muscle |
| Phosphorylation assays | Phosphorylation state of calcium-handling proteins | Study kinase/phosphatase regulation of calcium release |
| Calcium store content measurement | Sarcoplasmic reticulum calcium load | Evaluate ATP2A2 and PLN function |
| Channel localization imaging | Subcellular localization of ryanodine receptor | Track channel distribution in cardiac cells |
Calcium imaging
Calcium imaging measures cytosolic calcium transients to assess release of sequestered calcium ion from the sarcoplasmic reticulum in cardiac cells. This method directly reports on the functional output of GO:0010881.
Electrophysiology of calcium-release channels
Electrophysiological probing of the cardiac sarcoplasmic reticulum calcium-release channel with permeant and impermeant organic cations reveals conduction pathway properties. This approach measures ion flow through the ryanodine receptor channel.
Molecular interaction assays
Assays for nitric oxide interaction with ryanodine receptors can determine how signaling molecules modulate calcium release. Such experiments link molecular regulation to cardiac contraction.
Comparative contraction-relaxation studies
Comparing contraction-relaxation cycles in cardiac and vascular smooth muscle helps identify cardiac-specific regulatory factors. This method contextualizes GO:0010881 within broader muscle physiology.
How CRISPR Can Be Used to Study GO:0010881 regulation of cardiac muscle contraction by regulation of the release of sequestered calcium ion
Knockout
CRISPR knockout of genes such as RYR2 or NOS1 can test their requirement for regulation of cardiac muscle contraction by regulation of the release of sequestered calcium ion. Loss-of-function models help determine whether a candidate gene is necessary for calcium release.
Point Mutation
Point mutations in RYR2 or PLN can mimic disease-associated variants and reveal how specific residues affect calcium-release channel function. Such models are useful for dissecting structure-function relationships in the conduction pathway.
Knock-in
Knock-in of tagged or mutant alleles, such as tagged RYR2, allows tracking of channel localization and function in cardiac cells. This approach preserves endogenous regulatory context for GO:0010881.
Overexpression
Overexpression of ATP2A2 or NOS1 can test gain-of-function effects on sarcoplasmic reticulum calcium load and release. Overexpression models complement knockout studies to establish causality in cardiac calcium handling.
How EDITGENE Supports regulation of cardiac muscle contraction by regulation of the release of sequestered calcium ion Research
Researchers studying regulation of cardiac muscle contraction by regulation of the release of sequestered calcium ion-related genes often need to determine whether a candidate gene is causally involved in calcium release or is merely correlated with contractile changes. EDITGENE provides CRISPR-based cell models and screening services to test such hypotheses directly.
Contact EDITGENE today to design your custom CRISPR model for regulation of cardiac muscle contraction by regulation of the release of sequestered calcium ion research.
Frequently Asked Questions About regulation of cardiac muscle contraction by regulation of the release of sequestered calcium ion
What is GO:0010881?
GO:0010881 is the biological process of regulating cardiac muscle contraction by regulating the release of sequestered calcium ion from the sarcoplasmic reticulum into the cytosol.
What genes are involved in regulation of cardiac muscle contraction by regulation of the release of sequestered calcium ion?
Key genes include RYR2, NOS1, ATP2A2, PLN, and CACNA1C, which control calcium release and contraction.
How does the sarcoplasmic reticulum release calcium in cardiac muscle?
The sarcoplasmic reticulum releases sequestered calcium upon receipt of a signal relayed by T tubules, through channels such as the ryanodine receptor.
What is the role of nitric oxide in cardiac calcium release?
Nitric oxide interacts with ryanodine receptors of cardiac sarcoplasmic reticulum to modulate calcium release.
How can researchers study the cardiac sarcoplasmic reticulum calcium-release channel?
The conduction pathway can be probed with permeant and impermeant organic cations using electrophysiological methods.
Why is cardiac calcium handling different from vascular smooth muscle?
Contraction-relaxation cycles in vascular smooth muscle are modified by different factors than in cardiac muscle, requiring tissue-specific study.
What diseases are linked to dysregulated sarcoplasmic reticulum calcium release?
Cardiac contractile dysfunction and arrhythmia have been linked to abnormal calcium release from the sarcoplasmic reticulum.
What CRISPR models are useful for studying GO:0010881?
Knockout, point-mutation, knock-in, and overexpression models of genes like RYR2, NOS1, and ATP2A2 are useful.
How does EDITGENE support cardiac calcium release research?
EDITGENE provides CRISPR cell model generation, library screening, and bioinformatics services for genes involved in calcium release.
What methods measure sarcoplasmic reticulum calcium release?
Calcium imaging, electrophysiology with organic cations, and molecular interaction assays are commonly used.
Conclusion
GO:0010881 captures the essential regulatory link between sarcoplasmic reticulum calcium release and cardiac muscle contraction. The ryanodine receptor and its modulation by nitric oxide are central molecular players, and structural studies of the channel conduction pathway provide mechanistic insight. Comparative physiology with vascular smooth muscle highlights the cardiac-specific nature of this regulation. CRISPR-based models and targeted assays enable researchers to test causality and explore therapeutic strategies for cardiac contractile dysfunction.
References
- 1. Salama G et al.. 2000. Molecular interaction between nitric oxide and ryanodine receptors of skeletal and cardiac sarcoplasmic reticulum.. Antioxid Redox Signal 2(1):5-16 PMID: 11232600
- 2. Kuriyama H et al.. 1982. Factors modifying contraction-relaxation cycle in vascular smooth muscles.. Am J Physiol 243(5):H641-62 PMID: 6291410
- 3. Tinker A et al.. 1993. Probing the structure of the conduction pathway of the sheep cardiac sarcoplasmic reticulum calcium-release channel with permeant and impermeant organic cations.. J Gen Physiol 102(6):1107-29 PMID: 8133241
