GO:0014827 intestine smooth muscle contraction: Mechanism, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0014827 intestine smooth muscle contraction describes the force-generating process in intestinal smooth muscle that changes muscle geometry through actin/myosin ATP-dependent cycling.
• The process is modulated by enteric neurotransmitters and gaseous mediators, including nitric oxide, which can both relax and, under certain conditions, promote contraction in enteric smooth muscle.
• Heterotrimeric G stimulatory protein alpha subunit (Gnas) is required for normal intestinal smooth muscle contraction in mice, linking G-protein signaling to contractile function.
• Mechanosensitivity of intestinal smooth muscle contributes to generating and maintaining pressure gradients across the intestine.
• Bioengineered functional smooth muscle can exhibit spontaneous rhythmic contraction in vitro, providing a tractable model for studying GO:0014827.
• Altered intestinal smooth muscle contraction is relevant to motility disorders, inflammation-driven dysmotility, and antigen-induced hypercontractility in sensitized models.
Description
Intestine smooth muscle contraction (GO:0014827) is the biological process in which force is generated within intestinal smooth muscle tissue, producing a change in muscle geometry. This process depends on chemo-mechanical energy conversion carried out by the actin/myosin complex, which generates force through ATP hydrolysis. The intestine, extending from the stomach to the anal canal and including both the small and large intestine, relies on coordinated smooth muscle contraction for mixing and propelling luminal contents. Researchers study GO:0014827 because it is central to gastrointestinal motility, and its dysregulation is associated with motility disorders, inflammation, and altered responses to neurotransmitters and antigens. Experimental models ranging from isolated smooth muscle preparations to bioengineered tissues have been used to dissect the cellular and molecular control of intestinal contractility. Understanding the mechanisms, genes, and regulatory inputs of GO:0014827 is therefore essential for both basic physiology and translational gastroenterology.
intestine smooth muscle contraction At A Glance
| GO ID | GO:0014827 |
|---|---|
| GO term | intestine smooth muscle contraction |
| Ontology | biological_process |
| Synonym | none |
| Major function | Force generation in intestinal smooth muscle via actin/myosin ATP-dependent cycling, producing changes in muscle geometry |
| Tissue context | Intestine, including small intestine and large intestine |
| Key mediators | Nitric oxide, neurotensin, G stimulatory protein alpha subunit, antigen sensitization |
| Experimental models | Isolated intestinal smooth muscle preparations, bioengineered smooth muscle, sensitized animal models |
What Is GO:0014827?
GO:0014827 intestine smooth muscle contraction is defined as a process in which force is generated within smooth muscle tissue, resulting in a change in muscle geometry, specifically occurring in the intestine. Force generation involves a chemo-mechanical energy conversion step carried out by the actin/myosin complex activity, which generates force through ATP hydrolysis. The intestine is the section of the alimentary canal from the stomach to the anal canal, including the large intestine and small intestine. In practice, this term captures the contractile events of intestinal smooth muscle, including spontaneous rhythmic contractions, agonist-induced contractions, and neurally mediated responses.
Why Is intestine smooth muscle contraction Important in Cell Biology?
GO:0014827 is important because intestinal smooth muscle contraction underlies essential gastrointestinal functions such as mixing and propulsion of contents, and its disruption contributes to motility disorders and inflammation-associated dysmotility. The process is modulated by a complex interplay of neurotransmitters, gaseous mediators, and G-protein signaling, making it a rich area for physiological and pharmacological research. Moreover, antigen-induced contraction in sensitized models links this process to immune-mediated intestinal dysfunction. Studying GO:0014827 therefore informs both normal gut physiology and disease mechanisms, and supports development of targeted interventions.
• Controls mixing and propulsion of intestinal contents, which is fundamental to digestion and absorption.
• Dysregulation is associated with motility disorders and inflammation-driven dysmotility.
• Nitric oxide-mediated effects on enteric smooth muscle highlight complex mediator control of contraction.
• G stimulatory protein alpha subunit is required for normal intestinal smooth muscle contraction in mice.
• Mechanosensitivity of smooth muscle helps generate and maintain pressure gradients across the intestine.
• Bioengineered smooth muscle with spontaneous rhythmic contraction offers a platform for contractility research.
• Neurotensin and other neuropeptides modulate mechanical and current responses in intestinal smooth muscle.
• Antigen-induced contraction in sensitized rats provides a model for immune-mediated hypercontractility.
• Pentagastrin can inhibit electrical and mechanical activities of intestinal smooth muscle, indicating hormonal modulation.
What Happens During intestine smooth muscle contraction?
Initiation by excitatory stimuli
In simple terms: The process starts when signals tell the intestinal muscle to contract.
Intestinal smooth muscle contraction can be initiated by excitatory neurotransmitters, hormones, and mechanical stimuli. For example, neurotensin evokes mechanical and current responses in guinea-pig intestinal smooth muscle, while pentagastrin can inhibit electrical and mechanical activities, showing that hormonal inputs can also suppress contraction. Antigen challenge in sensitized rats induces contraction of jejunal smooth muscle, demonstrating immune-mediated initiation.
Actin/myosin cross-bridge cycling and force generation
In simple terms: The muscle uses actin and myosin to pull and generate force, burning ATP for energy.
Force generation in intestinal smooth muscle involves chemo-mechanical energy conversion by the actin/myosin complex, which generates force through ATP hydrolysis. This cross-bridge cycling underlies the change in muscle geometry that defines GO:0014827. Bioengineered functional smooth muscle with spontaneous rhythmic contraction demonstrates that this machinery can operate in vitro.
Modulation by nitric oxide and enteric mediators
In simple terms: Chemical messengers like nitric oxide can change how strongly the muscle contracts.
Nitric oxide-mediated contraction has been described in enteric smooth muscle, indicating that nitric oxide can influence contractile state. Smooth muscle NOS, colocalized with caveolin-1, modulates contraction in mouse small intestine. These findings show that gaseous mediators and their localization within smooth muscle cells are important for regulating GO:0014827.
G-protein signaling and mechanosensitivity
In simple terms: Proteins inside the muscle cell relay signals and sense stretch to keep contraction coordinated.
Heterotrimeric G stimulatory protein alpha subunit is required for intestinal smooth muscle contraction in mice, linking G-protein signaling to this process. Smooth muscle mechanosensitivity generates and maintains pressure gradients across the intestine, integrating mechanical feedback into contractile control. Together, these mechanisms ensure that contraction is appropriately tuned to physiological demands.
Key Genes Involved in GO:0014827 intestine smooth muscle contraction
The following genes and proteins have been experimentally implicated in intestinal smooth muscle contraction (GO:0014827) or its modulation.
| Gene | Major Role | Research Relevance |
|---|---|---|
| Gnas | Encodes G stimulatory protein alpha subunit; required for intestinal smooth muscle contraction in mice | Loss-of-function studies show impaired contraction, linking G-protein signaling to GO:0014827 |
| NOS1 (nNOS) | Neuronal nitric oxide synthase; contributes to nitric oxide-mediated effects in enteric smooth muscle | Modulates contraction; colocalizes with caveolin-1 in mouse small intestine |
| NOS3 (eNOS) | Endothelial nitric oxide synthase; may contribute to smooth muscle NOS activity | Studied in the context of smooth muscle NOS and contraction modulation |
| CAV1 | Caveolin-1; colocalizes with smooth muscle NOS and modulates contraction | Scaffolding protein affecting NOS localization and contractile regulation |
| MYH11 | Smooth muscle myosin heavy chain; part of actin/myosin complex generating force | Core contractile machinery; target for functional studies of force generation |
| ACTG2 | Smooth muscle actin; component of actin/myosin complex | Participates in ATP-dependent force generation in intestinal smooth muscle |
| MYLK | Myosin light chain kinase; regulates myosin activity | Potential regulator of contractile cycling; studied in smooth muscle models |
| MYL9 | Myosin light chain; regulatory subunit of smooth muscle myosin | Phosphorylation status affects contraction; relevant to GO:0014827 |
| NTSR1 | Neurotensin receptor 1; mediates neurotensin responses in intestinal smooth muscle | Agonist studies show mechanical and current responses |
| NTSR2 | Neurotensin receptor 2; may mediate neurotensin effects | Potential modulator of neurotensin-induced contraction |
| GAST | Gastrin; pentagastrin inhibits electrical and mechanical activities | Hormonal modulation of intestinal smooth muscle activity |
| CCKBR | Cholecystokinin B receptor; mediates gastrin/pentagastrin effects | Receptor target for hormonal inhibition studies |
| GNB1 | G protein beta subunit; part of heterotrimeric G protein complex | Potential contributor to G-protein signaling in contraction |
| GNG2 | G protein gamma subunit; part of heterotrimeric G protein complex | Potential contributor to G-protein signaling in contraction |
| PRKCA | Protein kinase C alpha; may modulate smooth muscle contractility | Signaling node in contractile regulation; studied in smooth muscle |
| RHOA | RhoA GTPase; regulates calcium sensitization in smooth muscle | Modulates force generation; relevant to contraction studies |
| ROCK1 | Rho-associated kinase; downstream of RhoA in smooth muscle | Influences contractile tone; potential target in GO:0014827 research |
| ATP2B1 | Plasma membrane calcium ATPase; regulates calcium homeostasis | Affects calcium availability for contraction; studied in smooth muscle |
How Is intestine smooth muscle contraction Regulated?
Intestinal smooth muscle contraction (GO:0014827) is regulated by multiple inputs. Nitric oxide can mediate contraction in enteric smooth muscle, and smooth muscle NOS colocalized with caveolin-1 modulates contraction in mouse small intestine. Heterotrimeric G stimulatory protein alpha subunit is required for intestinal smooth muscle contraction in mice, indicating that G-protein signaling is a key regulatory node. Neurotensin evokes mechanical and current responses in guinea-pig intestinal smooth muscle, showing neuropeptide regulation. Pentagastrin inhibits electrical and mechanical activities, demonstrating hormonal suppression. Antigen-induced contraction in sensitized rats highlights immune-mediated regulation. Mechanosensitivity also contributes by generating and maintaining pressure gradients across the intestine.
intestine smooth muscle contraction and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| Gnas | Impaired intestinal smooth muscle contraction in mice | Knockout or conditional KO mice to assess contractility |
| NOS1 | Nitric oxide-mediated modulation of enteric smooth muscle | NOS1 KO or overexpression in intestinal smooth muscle cells |
| CAV1 | Colocalization with smooth muscle NOS and contraction modulation | CAV1 KO mice to study NOS localization and contraction |
| NTSR1 | Neurotensin-induced mechanical responses | NTSR1 KO or knock-in models for agonist studies |
| CCKBR | Pentagastrin-mediated inhibition of intestinal activity | CCKBR KO or point-mutation models for hormonal studies |
Motility disorders and dysmotility
Altered intestinal smooth muscle contraction is linked to motility disorders. Nitric oxide-mediated effects and smooth muscle NOS modulation can influence contractile state, and disruptions may contribute to dysmotility. G stimulatory protein alpha subunit is required for normal contraction in mice, suggesting that defects in this pathway could impair motility.
Inflammation and immune-mediated hypercontractility
Antigen-induced contraction of jejunal smooth muscle in sensitized rats provides evidence that immune activation can drive hypercontractility, relevant to inflammatory bowel conditions. This model links GO:0014827 to immune-mediated intestinal dysfunction.
Hormonal and neuropeptide dysregulation
Pentagastrin inhibits electrical and mechanical activities of intestinal smooth muscle, while neurotensin evokes mechanical and current responses. Dysregulation of such hormonal and neuropeptide inputs could contribute to abnormal contractility in disease.
From intestine smooth muscle contraction-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Is Gnas required for intestinal smooth muscle contraction? | Gnas knockout or conditional knockout mouse |
| How does smooth muscle NOS modulate contraction? | NOS1 knockout or overexpression in intestinal smooth muscle |
| Does caveolin-1 affect NOS localization and contraction? | CAV1 knockout mouse |
| How does neurotensin receptor signaling affect contraction? | NTSR1 knockout or knock-in models |
| Can bioengineered smooth muscle show spontaneous rhythmic contraction? | In vitro bioengineered functional smooth muscle |
| Does antigen sensitization induce hypercontractility? | Sensitized rat model with antigen challenge |
How to Study the intestine smooth muscle contraction Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Isolated tissue bath | Mechanical and electrical responses to agonists | Testing neurotensin, pentagastrin effects on contraction |
| Bioengineered smooth muscle | Spontaneous rhythmic contraction in vitro | Studying intrinsic contractile machinery |
| Knockout mouse models | Contraction deficits due to gene loss | Assessing Gnas requirement for contraction |
| NOS inhibition | Effect of nitric oxide on contraction | Modulating enteric smooth muscle contractility |
| Caveolin-1 studies | NOS localization and contraction modulation | Understanding scaffolding protein roles |
| Antigen sensitization | Immune-mediated hypercontractility | Modeling inflammation-associated dysmotility |
| Mechanosensitivity assays | Pressure gradient generation | Studying mechanotransduction in intestine |
Isolated tissue contractility assays
Isolated intestinal smooth muscle preparations are used to measure mechanical and electrical responses to agonists such as neurotensin and pentagastrin. These assays directly quantify force generation and changes in muscle geometry, the defining features of GO:0014827.
Bioengineered smooth muscle models
Bioengineering functional smooth muscle with spontaneous rhythmic contraction in vitro provides a controlled system to study contractile mechanisms and drug responses. This approach allows interrogation of actin/myosin function and rhythmicity.
Genetic and pharmacological manipulation
Knockout mice, such as Gnas mutants, and pharmacological agents like pentagastrin are used to dissect signaling pathways controlling contraction. NOS inhibitors and caveolin-1 studies further reveal modulatory roles.
Immune sensitization models
Antigen-induced contraction in sensitized rats is used to study immune-mediated hypercontractility and its impact on intestinal smooth muscle. This model links immune activation to GO:0014827.
How CRISPR Can Be Used to Study GO:0014827 intestine smooth muscle contraction
Knockout
CRISPR knockout of genes such as Gnas, NOS1, or CAV1 in intestinal smooth muscle cells or animal models can test their requirement for contraction, as demonstrated by Gnas knockout mice showing impaired contraction. Knockout of NOS1 or CAV1 would help dissect nitric oxide-mediated modulation.
Point Mutation
Point mutations can be introduced to mimic disease-associated variants or to disable specific phosphorylation sites in contractile proteins like MYL9 or MYLK. Such models help determine how single amino acid changes affect force generation in GO:0014827.
Knock-in
Knock-in of tagged versions of contractile proteins or signaling molecules (e.g., Gnas, NOS1) allows real-time imaging and biochemical tracking in intestinal smooth muscle. This approach can reveal localization and dynamics during contraction.
Overexpression
Overexpression of modulators such as NOS1 or CAV1 in intestinal smooth muscle cells can test gain-of-function effects on contraction. Overexpression studies complement knockout approaches to establish causality.
How EDITGENE Supports intestine smooth muscle contraction Research
Researchers studying intestine smooth muscle contraction-related genes often need to determine whether a candidate gene is causally involved in force generation, modulation, or disease-associated dysmotility. EDITGENE provides CRISPR-based cell and animal model services to enable such causal experiments.
Contact EDITGENE today to design your custom CRISPR model for intestine smooth muscle contraction research.
Frequently Asked Questions About intestine smooth muscle contraction
What is GO:0014827 intestine smooth muscle contraction?
GO:0014827 is the biological process in which force is generated within intestinal smooth muscle tissue, changing muscle geometry through actin/myosin ATP-dependent cycling.
What genes are involved in intestine smooth muscle contraction?
Genes implicated include Gnas, NOS1, CAV1, MYH11, ACTG2, MYLK, MYL9, NTSR1, and CCKBR, among others.
How is intestinal smooth muscle contraction regulated?
It is regulated by nitric oxide, G-protein signaling, neuropeptides like neurotensin, hormones like pentagastrin, and mechanosensitivity.
What role does nitric oxide play in intestinal smooth muscle contraction?
Nitric oxide can mediate contraction in enteric smooth muscle, and smooth muscle NOS colocalized with caveolin-1 modulates contraction in mouse small intestine.
Why is Gnas important for intestinal smooth muscle contraction?
Heterotrimeric G stimulatory protein alpha subunit (Gnas) is required for intestinal smooth muscle contraction in mice.
What experimental models are used to study intestine smooth muscle contraction?
Models include isolated tissue baths, bioengineered smooth muscle, knockout mice, and antigen-sensitized rats.
How does neurotensin affect intestinal smooth muscle?
Neurotensin evokes mechanical and current responses in guinea-pig intestinal smooth muscle.
Can intestinal smooth muscle contraction be studied in vitro?
Yes, bioengineered functional smooth muscle with spontaneous rhythmic contraction has been developed in vitro.
What is the link between intestinal smooth muscle contraction and disease?
Altered contraction is associated with motility disorders, inflammation-driven dysmotility, and antigen-induced hypercontractility.
How can CRISPR help study intestine smooth muscle contraction?
CRISPR knockout, point mutation, knock-in, and overexpression models can test causal roles of genes like Gnas, NOS1, and CAV1 in contraction.
Conclusion
GO:0014827 intestine smooth muscle contraction is a fundamental biological process driven by actin/myosin ATP-dependent force generation and modulated by nitric oxide, G-protein signaling, neuropeptides, hormones, and mechanosensitivity. Its dysregulation is linked to motility disorders and immune-mediated hypercontractility, making it a key area for gastroenterology research. CRISPR-based models and bioengineering approaches provide powerful tools to dissect the genes and mechanisms controlling this process.
References
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- 2. Kobayashi M et al.. 2018. Bioengineering functional smooth muscle with spontaneous rhythmic contraction in vitro.. Sci Rep 8(1):13544 PMID: 30202095
- 3. El-Yazbi AF et al.. 2008. Smooth muscle NOS, colocalized with caveolin-1, modulates contraction in mouse small intestine.. J Cell Mol Med 12(4):1404-15 PMID: 18400048
- 4. Ohkawa H. 1978. Inhibition of the electrical and mechanical activities of the intestinal smooth muscle by pentagastrin.. Tohoku J Exp Med 125(3):271-9 PMID: 694927
- 5. Amedzrovi Agbesi RJ et al.. 2026. Smooth Muscle Mechanosensitivity Generates and Maintains Pressure Gradients Across the Intestine.. Neurogastroenterol Motil 38(1):e14972 PMID: 39651614
- 6. Qin X et al.. 2017. Heterotrimeric G Stimulatory Protein α Subunit Is Required for Intestinal Smooth Muscle Contraction in Mice.. Gastroenterology 152(5):1114-1125.e5 PMID: 28043906
- 7. Ohashi H et al.. 1994. Mechanical and current responses to neurotensin in the smooth muscle of guinea-pig intestine.. J Auton Pharmacol 14(3):239-51 PMID: 7929476
- 8. Vermillion DL et al.. 1988. Antigen-induced contraction of jejunal smooth muscle in the sensitized rat.. Am J Physiol 255(6 Pt 1):G701-8 PMID: 3202167
