Effect of lead-exposed astrocytes on neuronal synaptic formation.
- Author:
Yan CUI
1
;
Tingting LI
;
Haiyang YU
;
Yingjun LIAO
2
;
Yaping JIN
3
Author Information
- Publication Type:Journal Article
- MeSH: Astrocytes; drug effects; physiology; Cell Survival; drug effects; Cells, Cultured; Culture Media, Conditioned; metabolism; Glutamic Acid; metabolism; Lead; toxicity; Neurons; drug effects; Synapses; drug effects; physiology
- From: Chinese Journal of Industrial Hygiene and Occupational Diseases 2014;32(9):641-647
- CountryChina
- Language:Chinese
-
Abstract:
OBJECTIVETo investigate the effect of lead-exposed astrocyte conditioned medium (ACM) on the synaptic formation of neurons and to provide reference for the mechanism of lead neurotoxicity.
METHODSAstrocytes were cultured in the medium containing 50, 100, 200, 400, and 800 µmol/L lead acetate for 72 h. Alamar Blue was used to assess the cell viability of astrocytes, and then ACM was collected. Primarily cultured neurons were divided into six groups: pure culture group, non-glutamic acid (Glu)-induced ACM treatment group, Glu-induced lead-free ACM treatment group, and Glu-induced 50, 100, and 200 µmol/L lead acetate-exposed ACM treatment groups. Neurons were collected after being cultured in ACM for 24, 48, or 72 h. The content of synaptophysin (SYP) in neurons was determined by Western blot. The SYP expression in neurons was measured by immunofluorescence after being cultured in ACMfor 72 h.
RESULTSIn all lead-exposed groups, the cell viability of astrocytes declined with increasing concentration of lead (P < 0.05). The Western blot showed that compared with the pure culture group, the non-Glu-induced ACM treatment group and Glu-induced lead- free ACM treatment group had significantly increased content of SYP in neurons (P < 0.01); compared with the non-Glu-induced ACM treatment group, the Glu-induced ACM treatment groups had significantly reduced SYP expression in neurons (P < 0.05); compared with the Glu-induced lead-free ACM treatment group, all lead-exposed ACM treatment groups had the content of SYP in neurons significantly reduced with increasing concentration of lead after 72-h culture (P < 0.01), the 200 µmol/L lead-exposed ACM treatment group had significantly reduced content of SYP in neurons after 48-h culture (P < 0.01), and all lead-exposed ACM treatment groups showed no significant changes in the content of SYP in neurons after 24-h culture. Double-labeling immunofluorescence of SYP showed that all lead-exposed ACM treatment groups had a significant decrease in the number of SYP-fluorescent particles after 72-h culture (P < 0.05).
CONCLUSIONAstrocytes promote synaptic formation of neurons, which may be inhibited during lead exposure.
