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Activation of purinergic P2X receptors associated with the parasympathetic nerves that supply the human bladder smooth muscle (detrusor) is implicated in control of detrusor contractility. The relative abundance of all seven subtypes colocalized with synaptic vesicles on parasympathetic nerves was examined in specimens from normal adult bladder, infants, and in adults with overactive detrusor contractility and a diagnosis of idiopathic detrusor instability (IDI) to determine whether receptor distribution varied with age or in patients with incontinence. Alteration in control of detrusor innervation was examined with P2X subtype-specific antibodies and an antibody against synaptic vesicles, using immunofluorescence and confocal microscopy. Detrusor samples were taken from: controls, at cystectomy for cancer or cystoscopic biopsy for hematuria (n = 22; age 33-88), child bladder, at surgical correction of vesico-ureteric reflux (n = 21; age 4 months to 2 years), and adults with detrusor instability at cystoscopy-cystodistension (n = 18; age 30-81). Adult specimens contained muscle with large varicosities (1.2 microm) along parasympathetic nerves with colocalized patches of all P2X(1-7) subtypes. Infant bladder revealed little evidence of P2X at age <9 months but approached adult levels at 2 years. Detrusor from IDI patients revealed selective absence of P2X(3) and P2X(5) beneath all the varicosities. This specific lack of P2X(3) and P2X(5) may impair control of detrusor contractility and contribute to the pathophysiology of urge incontinence.

Loss of Purinergic P2X3and P2X5Receptor Innervation in Human Detrusor from Adults with Urge Incontinence

Loss of Purinergic P2X₃and P2X₅Receptor Innervation in Human Detrusor from Adults with Urge Incontinence