19:10 - 21:00
Room: Ishikawa Ongakudō Interchange Hall
Poster Session
Pasakbumin A controls the growth of Mycobacterium tuberculosis by enhancing autophagy signaling pathway and increasing nitric oxide (NO) production in mouse macrophages
Hyo-Ji Lee1, Hyun-Jeong Ko2, Yu-Jin Jung1
1Department of Biological Sciences, Kangwon National University, Chuncheon, Korea, Republic of (South), 2College of Pharmacy, Kangwon National University, Chuncheon, Korea, Republic of (South)

Tuberculosis (TB) is a chronic infectious disease caused by Mycobacterium tuberculosis (Mtb) and still remains a major health problem worldwide. Recently, the need to develop new and more effective drugs to treat emerging multidrug-resistant TB (MDR-TB) and to reduce side effects of anti-TB drugs has been recognized, such as toxicity in liver and many other detrimental changes. In this study, to develop a novel candidate drug for the effective TB treatment with fewer side effects in host, the mycobactericidal activity of pasakbumin A (5F) was examined in H37Rv-infected macrophages. 5F is an extracted natural compound from Tongkat ali and it is known as healthy tonic, aphrodisiac property, anti-cancer and anti-malaria treatment. 5F had not direct toxicity to Mtb and macrophage cells, however, it significantly suppressed intracellular bacterial growth in Mtb-infected cells. 5F caused a significant increase in TNF- α production and a decrease in IL-10 production in Mtb-infected cells. The secretion of NO was also markedly enhanced in 5F -treated cells during Mtb infection. In addition, 5F treatment strongly induced the phosphorylation level of ERK1/2 and IκBα after 15 min of infection. Compared with Mtb-infected cells treated with 5F alone, combined treatment of 5F and anti-TB drug, rifampicin (RMP), was more effective in the inhibiting intracellular bacterial growth and IL-10 production and increasing TNF- α production. Furthermore, the ratio of conversion from LC3-I to LC3-II and endogenously expressing LC3, known as indicator of autophagy, rose in Mtb-infected cells treated with 5F and RMP. Treatment of 5F and RMP also potently induced the phosphorylated levels of ERK1/2, compared with Mtb-infected cells treated with 5F alone. These findings revealed that 5F could be developed as a novel TB drugs or adjuvants to improve mycobactericidal activity through the enhancing autophagy pathway and the increase of NO and inflammatory cytokine production.


Reference:
Mo-P1-40
Session:
Poster Session 1 ‟Innate immunity and infection”
Presenter/s:
Hyo-Ji Lee
Presentation type:
Poster Presentation
Room:
Ishikawa Ongakudō Interchange Hall
Date:
Monday, 30 October 2017
Time:
19:10 - 21:00
Session times:
19:10 - 21:00