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September 16-18, 2024
ICTM 2019

Yasuhiro Yoshida

Yasuhiro Yoshida, Speaker at Traditional Medicine Conference
University of Occupational and Environmental Health, Japan
Title : Oldenlandia diffusa-derived ursolic acid had anti-tumor effects associated with mitochondrial disorder in adult T cell leukemia cells


We previously reported that extracts from Chinese medicinal herbs, Oldenlandia diffusa (OD) have immunomodulating activity in murine spleen cells (1). Ursolic acid (UA) is included in OD and one of the active components for anti-tumor effects; however, anti-tumor activity of UA on ATL cells is largely unknown. In this communication, the effect of UA on proliferation of ATL cell lines (MT-1, MT-2, MT-4), Jurkat cells, and ATL patient cells were studied. PBMC was prepared from healthy donor and treated with UA for 12 h and 24 h. UA (10 μM) was not toxic for PBMC from healthy donor at 12 h. MT-4 was most sensitive to UA on inhibition of cell proliferation. To elucidate the mechanisms of UA-induced cell death, we investigated the effect of UA on apoptosis and autophagy induction on the ATL cells. Compare to control, Electron microscope demonstrated that UA treatment dramatically induced autophagosome in MT-4 cells. Additionally, mitochondrial potential was changed by UA treatment in MT-4 cells. Autophagy-related protein, mTOR was inactivated by UA treatment. Taken together, these results suggest that UA induced cell death might associate with autophagy and mitochondrial disorder.


Yasuhiro Yoshida, male, molecular immuno-biologist, graduated from department of immunology, school of medicine, Hiroshima University in 1998. He worked for University of occupational and environmental health in 1998-now. Since 2008, he became an associate professor of department of immunology and parasitology, school of medicine. From 1999 to 2002, he worked in Harvard University in USA as a research invastigator with Prof. Philip Auron, who cloned IL-1B. In recent year he focused on the event of transcription factor in immunological phenomena such as cancer and allergy. Additionally, he made an effort in the anticancer drug discovery from a natural plant energetically