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Smooth Muscle Mechanosensitivity Generates and Maintains Pressure Gradients Across the Intestine.
Neurogastroenterol Motil
December 2024
Laboratoire Matière et Systèmes Complexes UMR 7057, Université Paris Cité/CNRS, Paris, France.
Background: The gut, the ureter, or the Fallopian tube all transport biological fluids by generating trains of propagating smooth muscle constrictions collectively known as peristalsis. These tubes connect body compartments at different pressures. We extend here Poiseuille's experiments on liquid flow in inert tubes to an active, mechanosensitive tube: the intestine.
View Article and Find Full Text PDFRole of Interstitial Cells of Cajal in Congenital Ureteropelvic Junction Obstruction.
Afr J Paediatr Surg
September 2024
Department of Pathology, Bhima Bhoi Medical College and Hospital, Bolangir, Odisha, India.
Background: Although congenital ureteropelvic junction (UPJ) obstruction is the most common cause of neonatal hydronephrosis, aetiopathogenesis is still inconclusive. Recently, the paucity of interstitial cells of Cajal (ICC) at the narrow adynamic part of UPJ has been implicated as a causative factor.
Materials And Methods: This prospective study was conducted between October 2019 and March 2022 to find out the density of ICC by the immunohistochemical method using CD117 (c-kit) antibody, in resected segments of UPJ in obstruction patients and in renal tumour patients as control.
Nephron progenitors rhythmically alternate between renewal and differentiation phases that synchronize with kidney branching morphogenesis.
bioRxiv
January 2024
Department of Bioengineering, University of Pennsylvania, Philadelphia, 19104, PA, USA.
The mammalian kidney achieves massive parallelization of function by exponentially duplicating nephron-forming niches during development. Each niche caps a tip of the ureteric bud epithelium (the future urinary collecting duct tree) as it undergoes branching morphogenesis, while nephron progenitors within niches balance self-renewal and differentiation to early nephron cells. Nephron formation rate approximately matches branching rate over a large fraction of mouse gestation, yet the nature of this apparent pace-maker is unknown.
View Article and Find Full Text PDFVariation in the Expression of Interstitial Cell of Cajal-like Cell (CD117) Across Congenital Pelvic-ureteric Junction Obstruction and its Renal Sonological and Functional Correlation: A Prospective Observational Study.
J Indian Assoc Pediatr Surg
November 2022
Department of Radiodiagnosis, Maulana Azad Medical College, New Delhi, India.
Aims And Objectives: This study aims to study the variation in the expression of CD117-positive interstitial cells of Cajal-like cells (ICC-LC) across the upper urinary tract region in children presenting with pelvic-ureteric junction obstruction (PUJO) and its association with renal functional and sonological parameters of patients.
Materials And Methods: A prospective observational study was done on 20 children with congenital PUJO who underwent dismembered pyeloplasty. All children underwent renal sonography (anteroposterior pelvic diameter [APPD], pelvicalyceal ratio [P/C ratio], Mid polar renal parenchymal diameter [MPPD]) and functional imaging scan (LLEC scan or DTPA scan).
Propagation of Pacemaker Activity and Peristaltic Contractions in the Mouse Renal Pelvis Rely on Ca-activated Cl Channels and T-Type Ca Channels.
Function (Oxf)
January 2023
Department of Physiology and Cell Biology, University of Nevada, Reno School of Medicine, 1664 North Virginia Street, Reno, NV, 89557, USA.
The process of urine removal from the kidney occurs via the renal pelvis (RP). The RP demarcates the beginning of the upper urinary tract and is endowed with smooth muscle cells. Along the RP, organized contraction of smooth muscle cells generates the force required to move urine boluses toward the ureters and bladder.
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