Abstract
Polychlorinated biphenyls (PCBs) are persistent organic pollutants present in human blood and milk. Exposure to PCBs during pregnancy and lactation leads to cognitive impairment in children. Perinatal exposure to PCB 153 or PCB 126 impairs the glutamate–nitric oxide–cGMP pathway in cerebellum in vivo and learning ability in adult rats. The aims of this work were: (1) to assess whether long-term exposure of primary cultures of cerebellar neurons to PCB 153 or PCB 126 reproduces the impairment in the function of the glutamate–nitric oxide–cGMP pathway found in rat cerebellum in vivo; (2) to provide some insight on the steps of the pathway affected by these PCBs; (3) to assess whether the mechanisms of interference of the pathway are different for PCB 126 and PCB 153. Both PCB 153 and PCB 126 increase basal levels of cGMP by different mechanisms. PCB 126 increases the amount of soluble guanylate cyclase while PCB 153 does not. PCB 153 reduces the amount of calmodulin while PCB 126 does not. Also both PCBs impair the function of the glutamate–nitric oxide–cGMP pathway by different mechanisms, PCB 153 impairs nitric oxide-induced activation of soluble guanylate cyclase and increase in cGMP while PCB 126 does not. PCB 126 reduces NMDA-induced increase in calcium while PCB 153 does not. When PCB 153 and PCB 126 exhibit the same effect, PCB 126 was more potent than PCB 153, as occurs in vivo.
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Abbreviations
- NO:
-
Nitric oxide
- NOS:
-
Nitric oxide synthase
- PCBs:
-
Polychlorinated biphenyls
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Acknowledgements
This work was supported by grants from the European Commission Program Food Quality and Safety (FOOD-CT-2003-506143) and from Ministerio de Ciencia e Innovacion (SAF2008-00062, SAF2005-06089 and CSD2008-00005) of Spain and by grants from Consellería de Empresa, Universidad y Ciencia (Grupos03/001, GV04B-055, GV04B-012, GVS05/082, ACOMP06/005, ACOMP/2007/002) and AP005/06 and EVES 034-2007 from Conselleria de Sanitat of Generalitat Valenciana.
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Llansola, M., Piedrafita, B., Rodrigo, R. et al. Polychlorinated Biphenyls PCB 153 and PCB 126 Impair the Glutamate–Nitric Oxide–cGMP Pathway in Cerebellar Neurons in Culture by Different Mechanisms. Neurotox Res 16, 97–105 (2009). https://doi.org/10.1007/s12640-009-9055-8
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DOI: https://doi.org/10.1007/s12640-009-9055-8