Cara C Hardy1,2,3, Spencer R Keilich1,4, Andrew G Harrison1,4, Brittany E Knight2, Dylan S Baker1, Phillip P Smith1,2,3,5. 1. Center on Aging, UConn Health, University of Connecticut SOM, Farmington, Connecticut. 2. Department of Neuroscience, UConn Health, University of Connecticut SOM, Farmington, Connecticut. 3. Institute for Brain and Cognitive Sciences, University of Connecticut, Storrs, Connecticut. 4. Department of Immunology, UConn Health, University of Connecticut SOM, Farmington, Connecticut. 5. Department of Surgery, UConn Health, University of Connecticut SOM, Farmington, Connecticut.
Abstract
AIMS: The prevalence of urinary dysfunction increases with age, yet therapies are often suboptimal. Incomplete understanding of the linkages between system, organ, and tissue domains across lifespan remains a knowledge gap. If tissue-level changes drive the aging bladder phenotype, parallel changes should be observed across these domains. In contrast, a lack of inter-domain correlation across age groups would support the hypothesis that urinary performance is a measure of the physiologic reserve, dependent on centrally-mediated adaptive mechanisms in the aging system. METHODS: Male and female mice across four age groups underwent sequential voiding spot assays, pressure/flow cystometry, bladder strip tension studies, histology, and quantitative PCR analyses. The primary objective of this study was to test the impact of age on the cortical, autonomic, tissue functional and structural, and molecular domains, and identify inter-domain correlations among variables showing significant changes with age within these domains. RESULTS: Behavior revealed diminished peripheral voiding and spot size in aged females. Cystometry demonstrated increased postvoid residual and loss of volume sensitivity, but the preservation of voiding contraction power, with almost half of oldest-old mice failing under cystometric stress. Strip studies revealed no significant differences in adrenergic, cholinergic, or EFS sensitivity. Histology showed increased detrusor and lamina propria thickness, without a change in collagen/muscle ratio. Adrb2 gene expression decreased with age. No consistent inter-domain correlations were found across age groups. CONCLUSIONS: Our findings are consistent with a model in which centrally-mediated adaptive failures to aging stressors are more influential over the aging bladder phenotype than local tissue changes.
AIMS: The prevalence of urinary dysfunction increases with age, yet therapies are often suboptimal. Incomplete understanding of the linkages between system, organ, and tissue domains across lifespan remains a knowledge gap. If tissue-level changes drive the aging bladder phenotype, parallel changes should be observed across these domains. In contrast, a lack of inter-domain correlation across age groups would support the hypothesis that urinary performance is a measure of the physiologic reserve, dependent on centrally-mediated adaptive mechanisms in the aging system. METHODS: Male and female mice across four age groups underwent sequential voiding spot assays, pressure/flow cystometry, bladder strip tension studies, histology, and quantitative PCR analyses. The primary objective of this study was to test the impact of age on the cortical, autonomic, tissue functional and structural, and molecular domains, and identify inter-domain correlations among variables showing significant changes with age within these domains. RESULTS: Behavior revealed diminished peripheral voiding and spot size in aged females. Cystometry demonstrated increased postvoid residual and loss of volume sensitivity, but the preservation of voiding contraction power, with almost half of oldest-old mice failing under cystometric stress. Strip studies revealed no significant differences in adrenergic, cholinergic, or EFS sensitivity. Histology showed increased detrusor and lamina propria thickness, without a change in collagen/muscle ratio. Adrb2 gene expression decreased with age. No consistent inter-domain correlations were found across age groups. CONCLUSIONS: Our findings are consistent with a model in which centrally-mediated adaptive failures to aging stressors are more influential over the aging bladder phenotype than local tissue changes.
Authors: Fouad Lemtiri-Chlieh; Dylan S Baker; Iman M Al-Naggar; Ramalakshmi Ramasamy; George A Kuchel; Eric S Levine; Paul Robson; Phillip P Smith Journal: Am J Physiol Regul Integr Comp Physiol Date: 2022-05-03 Impact factor: 3.210
Authors: Cara C Hardy; Iman M Al-Naggar; Chia-Ling Kuo; George A Kuchel; Phillip P Smith Journal: J Gerontol A Biol Sci Med Sci Date: 2021-06-14 Impact factor: 6.053
Authors: Siyu Lan; Jie Duan; Nan Zeng; Bin Yu; Xuping Yang; Hong Ning; Yilan Huang; Youyi Rao Journal: Medicine (Baltimore) Date: 2021-04-30 Impact factor: 1.817