Three photoinitiators induce breast tumor growth in mouse xenografts with MCF-7 breast cancer cells.

Abstract

Photoinitiators are utilized in the production of a wide range of commonly used products. However, some photoinitiators exert toxic effects. We previously demonstrated the endocrine-disrupting effects of photoinitiators in vitro. The present study investigated the estrogenic activities of three photoinitiators: 1-hydroxycyclohexyl phenyl ketone (1-HCHPK), methyl 2-benzoylbenzoate (MBB), and 2-methyl-4'-(methylthio)-2-morpholinopropiophenone (MTMP), which were subcutaneously injected into mouse xenografts with MCF-7 breast cancer cells. The results obtained showed that 1-HCHPK, MBB, and MTMP promoted breast tumor growth in these xenografts. A pretreatment with the estrogen receptor antagonist tamoxifen blocked the tumor growth-promoting effects of each photoinitiator. Collectively, the present results suggest that the three photoinitiators exhibit estrogenic agonist activities in vivo. Furthermore, as a factor for breast tumor growth, these photoinitiators potentially have estrogenic properties in vivo.

• Authors: Yoichi Kawasaki, Toshiaki Sendo
• Journal: Current research in toxicology (Curr Res Toxicol) Vol. 2 Pg. 322-328 ( 2021) ISSN: 2666-027X [Electronic] Netherlands
• PMID: 34522900 (Publication Type: Journal Article)
• Copyright: © 2021 The Author(s).