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2015 ; 156
(10
): 2021-2031
Nephropedia Template TP
gab.com Text
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English Wikipedia
Neonatal vaginal irritation results in long-term visceral and somatic
hypersensitivity and increased hypothalamic-pituitary-adrenal axis output in
female mice
#MMPMID26098441
Pierce AN
; Zhang Z
; Fuentes IM
; Wang R
; Ryals JM
; Christianson JA
Pain
2015[Oct]; 156
(10
): 2021-2031
PMID26098441
show ga
Experiencing early life stress or injury increases a woman's likelihood of
developing vulvodynia and concomitant dysregulation of the
hypothalamic-pituitary-adrenal (HPA) axis. To investigate the outcome of neonatal
vaginal irritation (NVI), female mouse pups were administered intravaginal
zymosan on postnatal days 8 and 10 and were assessed as adults for vaginal
hypersensitivity by measuring the visceromotor response to vaginal balloon
distension (VBD). Western blotting and calcium imaging were performed to measure
transient receptor potential ankyrin 1 (TRPA1) and vanilloid 1 (TRPV1) in the
vagina and innervating primary sensory neurons. Serum corticosterone (CORT), mast
cell degranulation, and corticotropin-releasing factor receptor 1 (CRF1)
expression were measured as indicators of peripheral HPA axis activation.
Colorectal and hind paw sensitivity were measured to determine
cross-sensitization resulting from NVI. Adult NVI mice had significantly larger
visceromotor response during VBD than naive mice. TRPA1 protein expression was
significantly elevated in the vagina, and calcium transients evoked by mustard
oil (TRPA1 ligand) or capsaicin (TRPV1 ligand) were significantly decreased in
dorsal root ganglion from NVI mice, despite displaying increased
depolarization-evoked calcium transients. Serum CORT, vaginal mast cell
degranulation, and CRF1 protein expression were all significantly increased in
NVI mice, as were colorectal and hind paw mechanical and thermal sensitivity.
Neonatal treatment with a CRF1 antagonist, NBI 35965, immediately before zymosan
administration largely attenuated many of the effects of NVI. These results
suggest that NVI produces chronic hypersensitivity of the vagina, as well as of
adjacent visceral and distant somatic structures, driven in part by increased HPA
axis activation.