Please use this identifier to cite or link to this item: https://scholarbank.nus.edu.sg/handle/10635/113547
Title: Microcystic cyanobacteria causes mitochondrial membrane potential alteration and reactive oxygen species formation in primary cultured rat hepatocytes
Authors: Ding, W.-X.
Shen, H.-M. 
Shen, Y.
Zhu, H.-G.
Ong, C.-N. 
Keywords: Cyanobacteria
Hepatocytes
Hepatotoxicity
Microcystin
Mitochondrial membrane potential
Reactive oxygen species
Issue Date: 1998
Citation: Ding, W.-X.,Shen, H.-M.,Shen, Y.,Zhu, H.-G.,Ong, C.-N. (1998). Microcystic cyanobacteria causes mitochondrial membrane potential alteration and reactive oxygen species formation in primary cultured rat hepatocytes. Environmental Health Perspectives 106 (7) : 409-413. ScholarBank@NUS Repository.
Abstract: Cyanobacteria contamination of water has become a growing public health problem worldwide. Microcystis aeruginosa is one of the most common toxic cyanobacteria. It is capable of producing microcystins, a group of cyclic heptapeptide compounds with potent hepatotoxicity and tumor promotion activity. The present study investigated the effect of microcystic cyanobacteria on primary cultured rat hepatocytes by examining mitochondrial membrane potential (MMP) changes and intracellular reactive oxygen species (ROS) formation in cells created with lyophilized freshwater microcystic cyanobacteria extract (MCE). Rhodamine 123 (Rh-123) was used as a fluorescent probe for changes in mitochondrial fluorescence intensity. The mitochondrial Rh-123 fluorescence intensity in MCE-treated hepatocytes, examined using a laser confocal microscope, responded in a dose- and time-dependent manner. The results thus indicate that the alteration of MMP might be an important event in the hepatotoxicity caused by cyanobacteria. Moreover, the parallel increase of ROS formation detected using another fluorescent probe, 2',7'-dichlorofluorescin diacetate also suggests the involvement of oxidative stress in the hepatotoxicity caused by cyanobacteria. The fact that MMP changes precede other cytotoxic parameters such as nuclear staining by propidium iodide and cell morphological changes suggests that mitochondrial damage is closely associated with MCE-induced cell injury in cultured rat hepatocytes.
Source Title: Environmental Health Perspectives
URI: http://scholarbank.nus.edu.sg/handle/10635/113547
ISSN: 00916765
Appears in Collections:Staff Publications

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