The 67-kDa laminin receptor (67LR) is a laminin-binding protein overexpressed in various types of cancer, including bile duct carcinoma, colorectal carcinoma, cervical cancer, and breast carcinoma. 67LR plays a vital role in growth and metastasis of tumor cells and resistance to chemotherapy. Here, we show that 67LR functions as a cancer-specific death receptor. In this cell death receptor pathway, cGMP initiated cancer-specific cell death by activating the PKCδ/acid sphingomyelinase (PKCδ/ASM) pathway. Furthermore, upregulation of cGMP was a rate-determining process of 67LR-dependent cell death induced by the green tea polyphenol (–)-epigallocatechin-3-
Motofumi Kumazoe, Kaori Sugihara, Shuntaro Tsukamoto, Yuhui Huang, Yukari Tsurudome, Takashi Suzuki, Yumi Suemasu, Naoki Ueda, Shuya Yamashita, Yoonhee Kim, Koji Yamada, Hirofumi Tachibana
Inhibition of PDE5 potentiates 67LR-dependent cell death by enhancing the 67LR-dependent signaling pathway in MM cells.