期刊
PARASITOLOGY
卷 148, 期 9, 页码 1074-1082出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S0031182021000718
关键词
Acanthamoeba triangularis; autophagy; Cassia angustifolia; encystation
类别
资金
- Royal Patronage of Her Royal Highness Princess Maha Chakri Sirindhorn - Botanical Garden of Walailak University [WUBG020-2564]
- Walailak University [WU-IRG-63-073]
- Research Institute of Health Science (RIHS) staff for the laboratory facilities and Benjaporn Somjit at the Center for Scientific and Technological Equipment for SEM imaging, Walailak University
- project CICECO-Aveiro Institute of Materials [UIDB/50011/2020, UIDP/50011/2020]
- FCT/MCTES
The study demonstrated the amoebicidal activity of Cassia angustifolia Vahl. extract against Acanthamoeba triangularis trophozoite and observed the autophagic response in surviving trophozoites. Further research is needed for the isolation and purification of active compounds, as well as for the investigation of cytotoxicity against human cells and autophagic response at the protein level.
Cassia angustifolia Vahl. plant is used for many therapeutic purposes, for example, in people with constipation, skin diseases, including helminthic and parasitic infections. In our study, we demonstrated an amoebicidal activity of C. angustifolia extract against Acanthamoeba triangularis trophozoite at a micromolar level. Scanning electron microscopy (SEM) images displayed morphological changes in the Acanthamoeba trophozoite, which included the formation of pores in cell membrane and the membrane rupture. In addition to the amoebicidal activity, effects of the extract on surviving trophozoites were observed, which included cyst formation and vacuolization by a microscope and transcriptional expression of Acanthamoeba autophagy in response to the stress by quantitative polymerase chain reaction. Our data showed that the surviving trophozoites were not transformed into cysts and the trophozoite number with enlarged vacuole was not significantly different from that of untreated control. Molecular analysis data demonstrated that the mRNA expression of AcATG genes was slightly changed. Interestingly, AcATG16 decreased significantly at 12 h post treatment, which may indicate a transcriptional regulation by the extract or a balance of intracellular signalling pathways in response to the stress, whereas AcATG3 and AcATG8b remained unchanged. Altogether, these data reveal the anti-Acanthamoeba activity of C. angustifolia extract and the autophagic response in the surviving trophozoites under the plant extract pressure, along with data on the formation of cysts. These represent a promising plant for future drug development. However, further isolation and purification of an active compound and cytotoxicity against human cells are needed, including a study on the autophagic response at the protein level.
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