Baicalein induces programmed cell death in Candida albicans.
Recent evidence has revealed the occurrence of an apoptotic phenotype in Candida albicans that is inducible with environmental stresses such as acetic acid, hydrogen peroxide, and amphotericin B. In the present study, we found that the Chinese herbal medicine Baicalein (BE), which was one of the skullcapflavones, can induce apoptosis in C. albicans. The apoptotic effects of BE were detected by flow cytometry using Annexin V-FITC and DAPI, and it was confirmed by transmission electron microscopy analysis. After exposure to 4 microg/ml BE for 12 h, about 10% of C. albicans cells were apoptotic. Both the increasing intracellular levels of reactive oxygen species (ROS) and upregulation of some redox-related genes (CAP1, SOD2, TRR1) were observed. Furthermore, we compared the survivals of CAP1 deleted, wild-type, and overexpressed strains and found that Cap1p attenuated BE-initiated cell death, which was coherent with a higher mRNA level of the CAP1 gene. In addition, the mitochondrial membrane potential of C. albicans cells changed significantly ( p<0.001) upon BE treatment compared with control. Taken together, our results indicate that BE treatment induces apoptosis in C.albicans cells, and the apoptosis was associated with the breakdown of mitochondrial membrane potential.
Dai
Bao-Di
BD
School of Pharmarcy, Second Military Medical University, 325 Guohe Road, Shanghai 200433, P.R. China.
Cao
Ying-Ying
YY
Huang
Shan
S
Xu
Yong-Gang
YG
Gao
Ping-Hui
PH
Wang
Yan
Y
Jiang
Yuan-Ying
YY
D000975:Antioxidants / Q000008:administration & dosage*; D017209:Apoptosis / Q000187:drug effects*; D050976:Basic-Leucine Zipper Transcription Factors; D002176:Candida albicans / Q000187:drug effects* / Q000502:physiology / Q000648:ultrastructure; D002177:Candidiasis / Q000188:drug therapy / Q000378:metabolism; D018797:Cell Cycle Proteins / Q000235:genetics / Q000378:metabolism; D044950:Flavanones / Q000008:administration & dosage*; D005656:Fungal Proteins / Q000235:genetics / Q000378:metabolism; D015966:Gene Expression Regulation, Fungal; D005800:Genes, Fungal; D006801:Humans; D053078:Membrane Potential, Mitochondrial / Q000187:drug effects; D046529:Microscopy, Electron, Transmission; D012331:RNA, Fungal / Q000096:biosynthesis / Q000235:genetics; D017382:Reactive Oxygen Species / Q000378:metabolism; D015854:Up-Regulation
D000975:Antioxidants; D050976:Basic-Leucine Zipper Transcription Factors; C426523:CAP1 protein, Candida albicans; D018797:Cell Cycle Proteins; D044950:Flavanones; D005656:Fungal Proteins; D012331:RNA, Fungal; D017382:Reactive Oxygen Species; C006680:baicalein