A constitutively active form of neurokinin 1 receptor and neurokinin 1 receptor-mediated apoptosis in glioblastomas.
A constitutively active form of neurokinin 1 receptor and neurokinin 1 receptor-mediated apoptosis in glioblastomas.
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DOI:
10.1111/j.1471-4159.2009.06032.x
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发表时间:
2009-05
影响因子:
4.7
通讯作者:
Kwatra MM
中科院分区:
文献类型:
--
作者:
Akazawa T;Kwatra SG;Goldsmith LE;Richardson MD;Cox EA;Sampson JH;Kwatra MM
Previous studies have shown that neurokinin 1 receptor (NK1R) occurs naturally in human glioblastomas and its stimulation causes cell proliferation. In the present study we show that stimulation of NK1R in human U373 glioblastoma cells by substance P (SP) increases Akt phosphorylation by 2.5-fold, with an EC50 of 57 nM. Blockade of NK1R lowers basal phosphorylation of Akt, indicating the presence of a constitutively active form of NK1R; similar results are seen in U251 MG and DBTRG-05 glioblastoma cells. Linkage of NK1R to Akt implicates NK1R in apoptosis of glioblastoma cells. Indeed, treatment of serum-starved U373 cells with SP reduces apoptosis by 53 ± 1% (P < 0.05), and treatment with NK1R antagonist L-733,060 increases apoptosis by 64 ± 16 % (P < 0.01). Further, the blockade of NK1R in human glioblastoma cells with L-733,060 causes cleavage of Caspase-3 and proteolysis of poly (ADP-ribose) polymerase (PARP). Experiments designed to elucidate the mechanism of NK1R-mediated Akt phosphorylation revealed total involvement of non-receptor tyrosine kinase Src and PI-3-kinase, a partial involvement of epidermal growth factor receptor (EGFR), and no involvement of MEK. Taken together, the results of the present study indicate a key role for NK1R in glioblastoma apoptosis.
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影响因子:
7.6
作者:
Kramer, MS;Winokur, A;Lee, Y
通讯作者:
Lee, Y
影响因子:
45.3
作者:
Chakravarti, A;Zhai, G;Loeffler, JS
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10.3
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Haas-Kogan, DA;Prados, MD;Stokoe, D
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Stokoe, D
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4.1
作者:
Nagai, S;Washiyama, K;Kunanishi, T
通讯作者:
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4.7
作者:
Amadoro, G.;Pieri, M.;Severini, C.
通讯作者:
Severini, C.