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2014 ; 94
(9
): 1030-41
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TRPA1 is required for TGF-? signaling and its loss blocks inflammatory fibrosis
in mouse corneal stroma
#MMPMID25068659
Okada Y
; Shirai K
; Reinach PS
; Kitano-Izutani A
; Miyajima M
; Flanders KC
; Jester JV
; Tominaga M
; Saika S
Lab Invest
2014[Sep]; 94
(9
): 1030-41
PMID25068659
show ga
We examined whether the loss of transient receptor potential ankyrin 1 (TRPA1),
an irritant-sensing ion channel, or TRPA1 antagonist treatment affects the
severity inflammation and scarring during tissue wound healing in a mouse cornea
injury model. In addition, the effects of the absence of TRPA1 on transforming
growth factor ?1 (TGF-?1)-signaling activation were studied in cell culture. The
lack of TRPA1 in cultured ocular fibroblasts attenuated expression of TGF-?1,
interleukin-6, and ?-smooth muscle actin, a myofibroblast the marker, but
suppressed the activation of Smad3, p38 MAPK, ERK, and JNK. Stroma of the healing
corneas of TRPA1(-/-) knockout (KO) mice appeared more transparent compared with
those of wild-type mice post-alkali burn. Eye globe diameters were measured from
photographs. An examination of the corneal surface and eye globes suggested the
loss of TRPA1 suppressed post-alkali burn inflammation and fibrosis/scarring,
which was confirmed by histology, immunohistochemistry, and gene expression
analysis. Reciprocal bone marrow transplantation between mice showed that KO
corneal tissue resident cells, but not KO bone marrow-derived cells, are
responsible for KO mouse wound healing with reduced inflammation and fibrosis.
Systemic TRPA1 antagonists reproduced the KO phenotype of healing. In conclusion,
a loss or blocking of TRPA1 in mice reduces inflammation and fibrosis/scarring in
the corneal stroma during wound healing following an alkali burn. The responsible
mechanism may include the inhibition of TGF-?1-signaling cascades in fibroblasts
by attenuated TRPA1 signaling. Inflammatory cells are considered to have a
minimum involvement in the exhibition of the KO phenotype after injury.
|Animals
[MESH]
|Corneal Diseases/pathology/*prevention & control
[MESH]