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2016 ; 7
(43
): 69961-69975
Nephropedia Template TP
gab.com Text
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English Wikipedia
Preclinical investigation of ibrutinib, a Bruton s kinase tyrosine (Btk)
inhibitor, in suppressing glioma tumorigenesis and stem cell phenotypes
#MMPMID27564106
Wei L
; Su YK
; Lin CM
; Chao TY
; Huang SP
; Huynh TT
; Jan HJ
; Whang-Peng J
; Chiou JF
; Wu AT
; Hsiao M
Oncotarget
2016[Oct]; 7
(43
): 69961-69975
PMID27564106
show ga
Standard interventions for glioma include surgery, radiation and chemotherapies
but the prognosis for malignant cases such as glioblastoma multiforme remain
grim. Even with targeted therapeutic agent, bevacitumab, malignant glioma often
develops resistance and recurrence. Thus, developing alternative interventions
(therapeutic targets, biomarkers) is urgently required. Bruton's tyrosine kinase
(Btk) has been long implicated in B cell malignancies but surprisingly it has
recently been shown to also play a tumorigenic role in solid tumors such as
ovarian and prostate cancer. Bioinformatics data indicates that Btk is
significantly higher in clinical glioma samples as compared to normal brain cells
and Btk expression level is associated with stage progression. This prompts us to
investigate the potential role of Btk as a therapeutic target for glioma. Here,
we demonstrate Btk expression is associated with GBM tumorigenesis.
Down-regulation of Btk in GBM cell lines showed a significantly reduced abilities
in colony formation, migration and GBM sphere-forming potential. Mechanistically,
Btk-silenced cells showed a concomitant reduction in the expression of CD133 and
Akt/mTOR signaling. In parallel, Ibrutinib (a Btk inhibitor) treatment led to a
similar anti-tumorigenic response. Using xenograft mouse model, tumorigenesis was
significantly reduced in Btk-silenced or ibrutinib-treated mice as compared to
control counterparts. Finally, our glioma tissue microarray analysis indicated a
higher Btk staining in the malignant tumors than less malignant and normal brain
tissues. Collectively, Btk may represent a novel therapeutic target for glioma
and ibrunitib may be used as an adjuvant treatment for malignant GBM.