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Growth inhibition and apoptosis by an active component of OK-432, a streptococcal agent, via Toll-like receptor 4 in human head and neck cancer cell lines.

Abstract：

:Toll-like receptor 4 (TLR4) plays a significant role in cancer therapy as receptors of bacteria-derived immunotherapeutic agents such as OK-432, a streptococcal immunotherapeutic agent. In addition, recent reports demonstrated that TLRs, including TLR4, are also expressed in cancer cells as well as in immunocompetent cells. It is a problem in cancer therapy that the immunoadjuvant may activate survival signals such as nuclear factor (NF)-κB or mitogen-activated protein kinases (MAPKs) in cancer cells via TLRs. In the current study, we investigated responsiveness of human head and neck cancer cell lines against TLR4 ligands, OK-PSA, an active component of OK-432, and a lipopolysaccharide (LPS). Stimulation with LPS or OK-PSA resulted in the activation of NF-κB in these cell lines expressing TLR4 and MD-2 that is a significant coreceptor for TLR4 signaling. Interestingly, OK-PSA induced cell-growth inhibition, while LPS enhanced the proliferation of the cancer cells. OK-PSA induced NF-κB activation more slowly than that induced by LPS. In addition, phosphorylation of p38 MAPK by OK-PSA was only slight compared with that by LPS. OK-PSA also induced apoptosis of the cancer cells mediated by the activation of caspase 1, 3 and 8 in a p53-independent manner. These findings strongly suggest that active components of OK-432 may elicit anti-cancer effects via enhancing host immunity as well as via directly inducing the growth inhibition and apoptosis of head and neck cancer cells through TLR4 signal.

journal_name

Oral Oncol

journal_title

Oral oncology

authors

Tano T,Okamoto M,Kan S,Nakashiro K,Shimodaira S,Yamashita N,Kawakami Y,Hamakawa H

doi

10.1016/j.oraloncology.2012.02.005

subject

Has Abstract

pub_date

2012-08-01 00:00:00

pages

678-85

issue

8

eissn

1368-8375

issn

1879-0593

pii

S1368-8375(12)00052-8

journal_volume

48

pub_type

杂志文章

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