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2016 ; 38
(1
): 17
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Age-related changes in murine bladder structure and sensory innervation: a
multiphoton microscopy quantitative analysis
#MMPMID26825637
Schueth A
; Spronck B
; van Zandvoort MA
; van Koeveringe GA
Age (Dordr)
2016[Feb]; 38
(1
): 17
PMID26825637
show ga
Our study aimed to examine and quantify age-related structural alterations in the
healthy mouse bladder using ex vivo two-photon laser scanning microscopy (TPLSM).
Freshly dissected bladders from 25-, 52-, and 85-week-old C57bl/6J mice were
examined, and morphological analyses and quantification of cell layers and nerves
were performed. The numbers of stretched, curled, branched, and total number of
nerves in volume units of the stained muscle layer were quantified. We observed
differences in the bladder wall architecture and innervation with age. Especially
in 85-week-old mice, age-related changes were found, including detachment of
urothelial cells and an increase in connective tissue, intermingled with the
smooth muscle fibers in the muscle layer (collagen-smooth muscle ratio of
1.15 ± 0.29). In 25- and 52-week-old mice, the collagen-smooth muscle ratios were
0.20 ± 0.04 and 0.31 ± 0.11, respectively, and a clear separation of collagen and
muscle was observed. The overall number of nerves and the number of curled nerves
were significantly higher in the 85-week-old mice (74.0 ± 13.0 and 25.9 ± 4.8,
respectively), when comparing to 25-week-old mice (26.0 ± 2.7 and 6.7 ± 1.2,
respectively) and 52-week-old mice (43.8 ± 4.3 and 22.1 ± 3.3, respectively).
Significant age-related alterations in bladder morphology and innervation were
found, when comparing freshly dissected bladder tissue from 25-, 52-, and
85-week-old mice. The higher number of curled nerves might be an indication of an
increased neurotransmitter release, resulting in a higher nerve activity, with a
part of the nerves being possibly mechanically impaired. This study shows that
two-photon laser scanning microscopy of healthy aging male mice is a useful
method to investigate and quantify the age-related changes in the bladder wall.