title: Age-related alterations in regeneration of the urinary bladder after subtotal cystectomy.
abstract: Prior work documented that surgical removal of approximately 70% of the bladder (subtotal cystectomy) in 12-week-old female rats induced complete functional regeneration of the bladder within 8 weeks. To determine whether animal age affects bladder regeneration, female F344 rats aged 12 weeks (young) and 12 months (old) underwent subtotal cystectomy, and then were evaluated from 1 to 26 weeks after subtotal cystectomy. At 26 weeks after subtotal cystectomy, bladder capacity in young animals was indistinguishable from that in age-matched controls, but bladder capacity in old animals was only approximately 56% of that in age-matched controls. There was no detectable difference in residual volume among treatment groups, but the diminished regeneration in old animals was associated with a corresponding increase in the ratio of residual volume to micturition volume. The majority of old animals exhibited evidence of chronic kidney damage after subtotal cystectomy. Maximal contraction of bladder strips to electrical field stimulation, as well as activation with carbachol, phenylephrine, and KCl, were lower in old than in young animals at 26 weeks after subtotal cystectomy. Immunostaining with proliferating cell nuclear antigen and Von Willebrand factor revealed delayed and/or diminished proliferative and angiogenic responses, respectively, in old animals. These results confirm prior work and suggest that multiple mechanisms may contribute to an age-related decline in the regenerative capacity of the bladder.
authors.affiliation: United States Army Institute of Surgical Research, Fort Sam Houston, Texas.
authors.forename: David M
authors.initials: DM
authors.lastname: Burmeister
authors.affiliation: Wake Forest Institute for Regenerative Medicine, Wake Forest School of Medicine, Winston-Salem, North Carolina.
authors.forename: Tamer
authors.initials: T
authors.lastname: AbouShwareb
authors.affiliation: Wake Forest Institute for Regenerative Medicine, Wake Forest School of Medicine, Winston-Salem, North Carolina.
authors.forename: Christopher R
authors.initials: CR
authors.lastname: Bergman
authors.affiliation: Wake Forest Institute for Regenerative Medicine, Wake Forest School of Medicine, Winston-Salem, North Carolina.
authors.forename: Karl-Erik
authors.initials: KE
authors.lastname: Andersson
authors.affiliation: United States Army Institute of Surgical Research, Fort Sam Houston, Texas. Electronic address: gchrist@wakehealth.edu.
authors.forename: George J
authors.initials: GJ
authors.lastname: Christ
mesh_terms: D000375:Aging / Q000473:pathology*; D000818:Animals; D001808:Blood Vessels / Q000187:drug effects / Q000473:pathology / Q000503:physiopathology; D002217:Carbachol / Q000494:pharmacology; D049109:Cell Proliferation / Q000187:drug effects; D003094:Collagen / Q000378:metabolism; D015653:Cystectomy; D005260:Female; D066298:In Vitro Techniques; D007668:Kidney / Q000473:pathology / Q000503:physiopathology; D016014:Linear Models; D009119:Muscle Contraction / Q000187:drug effects; D009132:Muscles / Q000187:drug effects / Q000473:pathology / Q000503:physiopathology; D018919:Neovascularization, Physiologic / Q000187:drug effects; D051381:Rats; D011916:Rats, Inbred F344; D012038:Regeneration / Q000187:drug effects; D001743:Urinary Bladder / Q000098:blood supply / Q000473:pathology / Q000503:physiopathology* / Q000601:surgery*; D014554:Urination / Q000187:drug effects; D014563:Urodynamics / Q000187:drug effects
chemical_list: D002217:Carbachol; D003094:Collagen