GO:0072105 ureteric peristalsis: Mechanism, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0072105 ureteric peristalsis describes the wavelike involuntary muscular contractions that propel urine from the kidney pelvis to the urinary bladder.
• Ureteric peristalsis depends on coordinated excitation-contraction coupling in ureteric smooth muscle, involving pacemaker activity, ion channels, and gap junctions.
• Loss or impairment of peristalsis leads to ureteral dilation, megaureter, and urinary stasis, which can predispose to infection and stone formation.
• Ureteral stents and percutaneous nephrostomy tubes can alter or bypass normal peristaltic flow, with clinical consequences for drainage.
• Key molecular players include L-type Ca2+ channels, RhoA/Rho-kinase, and interstitial cells of Cajal-like cells that generate pacemaker potentials.
• Research models for ureteric peristalsis include knockout mice, ex vivo ureter preparations, and CRISPR-engineered cell models for studying contractile machinery.
Description
Ureteric peristalsis (GO:0072105) is the biological process by which the ureter, a paired thick-walled tube, transports urine from the kidney pelvis to the urinary bladder through wavelike involuntary muscular contractions and relaxations. This process is essential for normal urinary tract function and is conserved across mammals. Disruption of ureteric peristalsis can result in ureteral dilation, megaureter, and urinary stasis, which may lead to infection, stone formation, and renal damage. Understanding the molecular and cellular mechanisms of ureteric peristalsis is therefore critical for developing treatments for congenital and acquired urinary tract disorders. Recent research has focused on the ionic and signaling pathways that drive spontaneous electrical activity and contraction in ureteric smooth muscle. This article synthesizes current knowledge on the definition, mechanisms, genes, and research methods related to GO:0072105, providing a resource for researchers studying urinary tract physiology and disease.
ureteric peristalsis At A Glance
| GO ID | GO:0072105 |
|---|---|
| GO term | ureteric peristalsis |
| Ontology | biological_process |
| Synonym | None |
| Major function | Propels urine from the kidney pelvis to the urinary bladder via wavelike muscular contractions |
| Related anatomy | Ureter (paired thick-walled tubes) |
| Key cell types | Ureteric smooth muscle cells, interstitial cells of Cajal-like pacemaker cells |
| Physiological trigger | Spontaneous electrical pacemaker potentials and stretch-induced depolarization |
| Clinical relevance | Ureteral dilation, megaureter, urinary stasis, and stent dysfunction |
What Is GO:0072105?
Ureteric peristalsis is the coordinated, wavelike sequence of involuntary muscular contraction and relaxation that travels along the ureter, impelling urine onward from the kidney to the bladder. It is a biological process that relies on the intrinsic pacemaker activity of specialized cells and the contractile machinery of smooth muscle cells.
Why Is ureteric peristalsis Important in Cell Biology?
Ureteric peristalsis is vital for maintaining unidirectional urine flow and preventing urinary stasis, which can lead to infection, stone formation, and kidney damage. Defects in peristalsis are associated with congenital anomalies such as megaureter and acquired conditions like ureteral obstruction. Understanding the mechanisms of peristalsis also informs the design of ureteral stents and drainage devices, as stents can disrupt normal peristaltic activity. Moreover, research on ureteric peristalsis provides insights into smooth muscle physiology and excitation-contraction coupling that are relevant to other muscular organs.
• Maintains unidirectional urine flow from kidney to bladder.
• Prevents urinary stasis, reducing risk of infection and stone formation.
• Dysfunction leads to ureteral dilation and megaureter.
• Impairment can cause hydronephrosis and renal damage.
• Ureteral stents alter peristaltic patterns, affecting drainage.
• Percutaneous nephrostomy bypasses peristalsis for urgent drainage.
• Provides a model for studying smooth muscle excitation-contraction coupling.
• Relevant to congenital urinary tract malformations.
• Informs development of pharmacological agents targeting ureteral motility.
• Key to understanding pacemaker activity in visceral smooth muscle.
What Happens During ureteric peristalsis?
Initiation of pacemaker activity
In simple terms: Specialized cells in the ureter generate spontaneous electrical signals that start the contraction wave.
Ureteric peristalsis begins with spontaneous electrical activity in pacemaker cells, often identified as interstitial cells of Cajal-like cells, located near the renal pelvis. These cells produce rhythmic depolarizations that spread to adjacent smooth muscle cells through gap junctions, initiating a contraction wave. The frequency and amplitude of these pacemaker potentials determine the peristaltic rate.
Excitation-contraction coupling
In simple terms: The electrical signal triggers calcium entry, which activates the muscle's contractile proteins.
Excitation-contraction coupling in ureteric smooth muscle involves depolarization-induced Ca2+ influx through L-type voltage-gated calcium channels. The resulting increase in intracellular Ca2+ activates calmodulin and myosin light chain kinase, leading to phosphorylation of the myosin regulatory light chain and cross-bridge cycling. RhoA/Rho-kinase signaling also contributes to Ca2+ sensitization, enhancing contractile force.
Propagation of the contraction wave
In simple terms: The contraction travels down the ureter like a wave, pushing urine ahead of it.
The contraction wave propagates along the ureter via electrical coupling through gap junctions composed of connexins. This cell-to-cell communication ensures coordinated contraction of the smooth muscle layers, creating a peristaltic wave that moves urine toward the bladder. The wave is modulated by neural inputs and local factors such as prostaglandins and nitric oxide.
Relaxation and refilling
In simple terms: After the contraction passes, the muscle relaxes, allowing the next bolus of urine to enter.
Following contraction, ureteric smooth muscle relaxes through mechanisms including Ca2+ reuptake into the sarcoplasmic reticulum and extrusion across the plasma membrane, as well as dephosphorylation of myosin light chain. This relaxation phase allows the ureter to refill with urine from the renal pelvis, preparing for the next peristaltic wave. Impaired relaxation can lead to functional obstruction and dilation.
Modulation by stretch and flow
In simple terms: The ureter senses how much urine is present and adjusts the strength of contractions.
Ureteric peristalsis is modulated by mechanical stretch and urine flow rate. Increased intraluminal pressure and stretch can enhance the frequency and force of contractions, ensuring efficient transport. This stretch-induced response involves mechanosensitive channels and may contribute to the adaptation of ureteral motility to varying urine output.
Key Genes Involved in GO:0072105 ureteric peristalsis
The following genes and proteins are critically involved in the initiation, regulation, and execution of ureteric peristalsis.
| Gene | Major Role | Research Relevance |
|---|---|---|
| CACNA1C | L-type voltage-gated calcium channel subunit mediating Ca2+ influx for contraction | Target for modulating ureteric smooth muscle contractility |
| MYLK | Myosin light chain kinase phosphorylates myosin regulatory light chain | Central to excitation-contraction coupling |
| RHOA | Small GTPase activating Rho-kinase for Ca2+ sensitization | Regulates contractile force in ureteric smooth muscle |
| ROCK1 | Rho-associated kinase enhancing myosin light chain phosphorylation | Modulates ureteric smooth muscle tone |
| GJA1 | Connexin 43 forming gap junctions for electrical coupling | Essential for propagation of peristaltic wave |
| KCNMA1 | Large-conductance Ca2+-activated K+ channel regulating membrane potential | Influences pacemaker activity and relaxation |
| ANO1 | Ca2+-activated Cl- channel in interstitial cells of Cajal | Potential pacemaker current contributor |
| P2RX1 | ATP-gated purinergic receptor mediating neural modulation | Regulates ureteric motility via purinergic signaling |
| NOS1 | Neuronal nitric oxide synthase producing NO for relaxation | Modulates ureteric smooth muscle relaxation |
| PTGS2 | Cyclooxygenase-2 synthesizing prostaglandins | Prostaglandins affect ureteric contractility |
| EDNRA | Endothelin receptor type A mediating contractile responses | Endothelin-1 modulates ureteric motility |
| ADRA1A | Alpha-1A adrenergic receptor mediating sympathetic contraction | Regulates ureteric smooth muscle tone |
| CHRM3 | Muscarinic acetylcholine receptor M3 mediating parasympathetic contraction | Influences ureteric peristalsis |
| ATP2A2 | SERCA2 calcium pump for Ca2+ reuptake into sarcoplasmic reticulum | Controls relaxation phase |
| CALM1 | Calmodulin activating myosin light chain kinase upon Ca2+ binding | Essential for Ca2+-dependent contraction |
| ACTG2 | Smooth muscle gamma-actin forming contractile filaments | Structural component of contractile apparatus |
| MYH11 | Smooth muscle myosin heavy chain generating contractile force | Core motor protein for peristalsis |
How Is ureteric peristalsis Regulated?
Ureteric peristalsis is regulated by intrinsic pacemaker activity, neural inputs, and local chemical mediators. The autonomic nervous system modulates peristalsis via sympathetic (alpha-1 adrenergic) and parasympathetic (muscarinic) pathways, while non-adrenergic non-cholinergic neurotransmitters such as nitric oxide and ATP provide additional control. Hormones and local factors including prostaglandins and endothelin-1 also influence ureteric smooth muscle contractility. At the cellular level, the frequency and amplitude of peristaltic waves are governed by the interplay of ion channels, calcium handling proteins, and RhoA/Rho-kinase signaling. Stretch and urine flow rate further modulate peristaltic activity to match urine production.
ureteric peristalsis and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| CACNA1C | Impaired ureteric contractility | Knockout or point-mutation in smooth muscle cells |
| MYLK | Defective excitation-contraction coupling | Knock-in of kinase-dead mutant |
| GJA1 | Loss of electrical coupling and peristaltic wave | Conditional knockout in ureteric smooth muscle |
| RHOA | Altered contractile force and Ca2+ sensitization | Overexpression of constitutively active mutant |
| NOS1 | Impaired relaxation and stasis | Knockout mouse model |
Megaureter and congenital ureteral dilation
Megaureter is a congenital or acquired condition characterized by ureteral dilation, often resulting from impaired ureteric peristalsis or obstruction. Defects in the pacemaker machinery or contractile apparatus can lead to ineffective peristaltic waves, causing urine stasis and dilation. Research using animal models has shown that loss of peristalsis directly leads to ureteral dilation, highlighting the importance of coordinated contractions for maintaining ureteral caliber.
Ureteral stent dysfunction and urinary stasis
Ureteral stents are commonly used to relieve obstruction, but they can disrupt normal peristaltic activity and cause urinary stasis, infection, and stone formation. Studies using color Doppler ultrasound have shown that stents alter ureteric peristalsis, which may contribute to stent-related morbidity. Understanding these effects is crucial for optimizing stent design and management.
Urinary tract obstruction and nephrostomy
Percutaneous nephrostomy is a procedure that diverts urine directly from the kidney, bypassing ureteric peristalsis. This is often necessary in cases of obstruction or when peristalsis is impaired, such as in severe megaureter or malignancy. While effective for drainage, nephrostomy does not restore normal peristaltic function, and patients may remain at risk for complications.
From ureteric peristalsis-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does gene X regulate pacemaker activity? | Knockout of gene X in interstitial cells of Cajal-like cells |
| Does point mutation in ion channel alter peristalsis? | CRISPR knock-in of point mutation in CACNA1C |
| Does overexpression of RhoA enhance contractility? | Overexpression of constitutively active RHOA in ureteric smooth muscle |
| Does loss of gap junctions disrupt peristaltic wave? | Conditional knockout of GJA1 |
| Does gene X affect ureteral dilation? | Knockout mouse model with ureteral diameter measurement |
| Does stent placement alter peristalsis? | Ex vivo ureter preparation with stent insertion |
How to Study the ureteric peristalsis Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Ex vivo ureter assay | Contraction frequency, amplitude, propagation | Drug screening and genetic studies |
| Calcium imaging | Intracellular Ca2+ transients | Pacemaker activity and excitation-contraction coupling |
| Patch-clamp | Ionic currents and membrane potential | Ion channel characterization |
| Color Doppler ultrasound | Urine flow jets and peristaltic frequency | Clinical assessment of stent effects |
| Immunohistochemistry | Protein localization in ureteric tissue | Identifying pacemaker cells and gap junctions |
| Western blot | Protein expression levels | Quantifying contractile proteins |
| RNA-seq | Transcriptomic profiling | Identifying genes involved in peristalsis |
| CRISPR screening | Gene function in contractility | High-throughput discovery of regulators |
Ex vivo ureter peristalsis assays
Ex vivo preparations of ureter can be used to measure spontaneous contractions and peristaltic waves using tension transducers or video microscopy. These assays allow direct assessment of contractile frequency, amplitude, and propagation velocity in response to pharmacological agents or genetic manipulations.
Calcium imaging
Calcium imaging with fluorescent indicators (e.g., Fura-2, Fluo-4) in isolated ureteric smooth muscle cells or whole-mount preparations reveals spatiotemporal Ca2+ dynamics underlying peristalsis. This method helps identify pacemaker sites and the role of specific Ca2+ channels.
Electrophysiology
Patch-clamp recordings from ureteric smooth muscle cells and interstitial cells of Cajal-like cells measure ionic currents that contribute to pacemaker potentials and action potentials. This technique is essential for characterizing the ion channels involved in peristalsis.
Color Doppler ultrasound
Color Doppler ultrasound can non-invasively assess ureteric peristalsis by detecting urine flow jets in the ureter. This method has been used to study the effects of stents on peristaltic activity in patients.
How CRISPR Can Be Used to Study GO:0072105 ureteric peristalsis
Knockout
CRISPR knockout of candidate genes in ureteric smooth muscle cell lines or animal models can determine their necessity for peristalsis. For example, knockout of CACNA1C or MYLK would abolish contractility, while knockout of GJA1 would disrupt wave propagation. These models help establish causal roles in ureteric peristalsis.
Point Mutation
CRISPR point mutation can introduce specific amino acid changes to mimic human variants or to dissect domain functions. For instance, mutating the phosphorylation site in MYLK or the Ca2+ binding site in calmodulin can reveal their regulatory roles in peristalsis.
Knock-in
Knock-in of reporter genes (e.g., fluorescent tags) or conditional alleles allows precise tracking of gene expression and function in ureteric tissue. Tagged knock-in of ANO1 or KCNMA1 can help visualize pacemaker cells and study their role in peristalsis.
Overexpression
Overexpression of constitutively active or dominant-negative mutants can enhance or suppress peristaltic activity. For example, overexpressing constitutively active RHOA increases Ca2+ sensitization and contractile force, while overexpressing a dominant-negative ROCK1 reduces it.
How EDITGENE Supports ureteric peristalsis Research
Researchers studying ureteric peristalsis-related genes often need to determine whether a candidate gene is causally involved in the initiation, propagation, or modulation of peristaltic contractions. EDITGENE provides a comprehensive suite of CRISPR-based services to accelerate this research, from gene knockout to precise point mutations and overexpression models.
Contact EDITGENE today to design your custom CRISPR model for ureteric peristalsis research.
Frequently Asked Questions About ureteric peristalsis
What is ureteric peristalsis?
Ureteric peristalsis is the wavelike involuntary muscular contraction and relaxation that propels urine from the kidney to the bladder through the ureter.
What genes are involved in ureteric peristalsis?
Key genes include CACNA1C, MYLK, RHOA, ROCK1, GJA1, KCNMA1, and ANO1, which regulate pacemaker activity, calcium signaling, and contraction.
How is ureteric peristalsis regulated?
It is regulated by intrinsic pacemaker cells, autonomic nerves, local mediators like nitric oxide and prostaglandins, and mechanical stretch.
What happens when ureteric peristalsis is impaired?
Impaired peristalsis can lead to ureteral dilation, megaureter, urinary stasis, infection, and stone formation.
Can ureteric peristalsis be studied in vitro?
Yes, ex vivo ureter preparations and isolated smooth muscle cells are used to study peristaltic contractions and calcium signaling.
What is the role of interstitial cells of Cajal in ureteric peristalsis?
Interstitial cells of Cajal-like cells act as pacemakers, generating spontaneous electrical activity that initiates peristaltic waves.
How do ureteral stents affect peristalsis?
Stents can disrupt normal peristaltic activity, leading to altered urine flow and potential stasis.
What is the clinical significance of ureteric peristalsis?
It is essential for normal urine transport; its dysfunction is associated with congenital and acquired urinary tract disorders.
What research methods are used to study ureteric peristalsis?
Methods include ex vivo contraction assays, calcium imaging, patch-clamp electrophysiology, and color Doppler ultrasound.
How can CRISPR help study ureteric peristalsis?
CRISPR allows knockout, point mutation, knock-in, and overexpression of candidate genes to dissect their roles in peristalsis.
Conclusion
Ureteric peristalsis (GO:0072105) is a fundamental biological process that ensures the transport of urine from the kidney to the bladder. Its molecular mechanisms involve coordinated ion channel activity, calcium signaling, and smooth muscle contraction, with key roles for genes such as CACNA1C, MYLK, and GJA1. Dysregulation of peristalsis contributes to conditions like megaureter and urinary stasis, highlighting its clinical importance. Advances in CRISPR-based models and imaging techniques continue to unravel the complexities of this process, offering potential therapeutic targets for urinary tract disorders.
References
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- 2. Kalayeh K et al.. 2024. Peristalsis prevents ureteral dilation.. Neurourol Urodyn 43(1):258-266 PMID: 37961019
- 3. Osman F et al.. 2009. Ureteral motility.. Acta Physiol Hung 96(4):407-26 PMID: 19942548
- 4. Manzoni C. 2002. Megaureter.. Rays 27(2):83-5 PMID: 12696257
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- 6. Patel U et al.. 1996. Ureteric drainage and peristalsis after stenting studied using colour Doppler ultrasound.. Br J Urol 77(4):530-5 PMID: 8777612
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