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2018 ; 41
(3
): 224-233
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Increased Primary Cilia in Idiopathic Pulmonary Fibrosis
#MMPMID29477141
Lee J
; Oh DH
; Park KC
; Choi JE
; Kwon JB
; Lee J
; Park K
; Sul HJ
Mol Cells
2018[Mar]; 41
(3
): 224-233
PMID29477141
show ga
Primary cilia are solitary, non-motile, axonemal microtubule-based antenna-like
organelles that project from the plasma membrane of most mammalian cells and are
implicated in transducing hedgehog signals during development. It was recently
proposed that aberrant SHH signaling may be implicated in the progression of
idiopathic pulmonary fibrosis (IPF). However, the distribution and role of
primary cilia in IPF remains unclear. Here, we clearly observed the primary cilia
in alveolar epithelial cells, fibroblasts, and endothelial cells of human normal
lung tissue. Then, we investigated the distribution of primary cilia in human IPF
tissue samples using immunofluorescence. Tissues from six IPF cases showed an
increase in the number of primary cilia in alveolar cells and fibroblasts. In
addition, we observed an increase in ciliogenesis related genes such as IFT20 and
IFT88 in IPF. Since major components of the SHH signaling pathway are known to be
localized in primary cilia, we quantified the mRNA expression of the SHH
signaling components using qRT-PCR in both IPF and control lung. mRNA levels of
SHH, the coreceptor SMO, and the transcription factors GLI1 and GLI2 were
upregulated in IPF compared with control. Furthermore, the nuclear localization
of GLI1 was observed mainly in alveolar epithelia and fibroblasts. In addition,
we showed that defective KIF3A-mediated ciliary loss in human type II alveolar
epithelial cell lines leads to disruption of SHH signaling. These results
indicate that a significant increase in the number of primary cilia in IPF
contributes to the upregulation of SHH signals.