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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Sci+Rep
2016 ; 6
(ä): 23034
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Sustained PI3K Activation exacerbates BLM-induced Lung Fibrosis via activation of
pro-inflammatory and pro-fibrotic pathways
#MMPMID26971883
Kral JB
; Kuttke M
; Schrottmaier WC
; Birnecker B
; Warszawska J
; Wernig C
; Paar H
; Salzmann M
; Sahin E
; Brunner JS
; Österreicher C
; Knapp S
; Assinger A
; Schabbauer G
Sci Rep
2016[Mar]; 6
(ä): 23034
PMID26971883
show ga
Idiopathic pulmonary fibrosis (IPF) is a life-threatening disease with limited
treatment options. Additionally, the lack of a complete understanding of
underlying immunological mechanisms underscores the importance of discovering
novel options for therapeutic intervention. Since the PI3K/PTEN pathway in
myeloid cells influences their effector functions, we wanted to elucidate how
sustained PI3K activity induced by cell-type specific genetic deficiency of its
antagonist PTEN modulates IPF, in a murine model of bleomycin-induced pulmonary
fibrosis (BIPF). We found that myeloid PTEN deficient mice (PTEN(MyKO)), after
induction of BIPF, exhibit increased TGF-?1 activation, mRNA expression of
pro-collagens and lysyl oxidase as well as augmented collagen deposition compared
to wild-type littermates, leading to enhanced morbidity and decreased survival.
Analysis of alveolar lavage and lung cell composition revealed that PTEN(MyKO)
mice exhibit reduced numbers of macrophages and T-cells in response to bleomycin,
indicating an impaired recruitment function. Interestingly, we found dysregulated
macrophage polarization as well as elevated expression and release of the
pro-fibrotic cytokines IL-6 and TNF-? in PTEN(MyKO) mice during BIPF. This might
point to an uncontrolled wound healing response in which the inflammatory as well
as tissue repair mechanisms proceed in parallel, thereby preventing resolution
and at the same time promoting extensive fibrosis.