Effect of inhibitors of NADPH oxidase complex and mitochondrial ATP-sensitive potassium channels on generation of dopaminergic neurons from neurospheres of mesencephalic precursors.
Reactive oxygen species signaling has been suggested to regulate stem cell development. In the present study, we treated neurospheres of rat mesencephalic precursors with inhibitors of the NADPH oxidase complex and mitochondrial ATP-sensitive potassium (mitoKATP) channel blockers during the proliferation and/or the differentiation periods to study the effects on generation of dopaminergic neurons. Treatment with low doses (100 or 250 μM) of the NADPH inhibitor apocynin during the proliferation period increased the generation of dopaminergic neurons. However, higher doses (1 mM) were necessary during the differentiation period to induce the same effect. Treatment with general (glibenclamide) or mitochondrial (5-hydroxydecanoate) KATP channel blockers during the proliferation and differentiation periods increased the number of dopaminergic neurons. Furthermore, neither increased proliferation rate nor apoptosis had a major role in the observed increase in generation of dopaminergic neurons, which suggests that the redox state is able to regulate differentiation of precursors into dopaminergic neurons.
Laboratory of Neuroanatomy and Experimental Neurology, Department of Morphological Sciences, University of Santiago de Compostela, Santiago de Compostela, Spain.
J A
JA
Parga
J
J
Rodríguez-Pallares
B
B
Joglar
C
C
Diaz-Ruiz
M J
MJ
Guerra
J L
JL
Labandeira-Garcia
D000818:Animals; D017209:Apoptosis / Q000187:drug effects; D015153:Blotting, Western; D049109:Cell Proliferation / Q000187:drug effects; D002478:Cells, Cultured; D003652:Decanoic Acids / Q000494:pharmacology; D004298:Dopamine / Q000378:metabolism*; D004791:Enzyme Inhibitors / Q000494:pharmacology*; D005905:Glyburide / Q000494:pharmacology; D006880:Hydroxy Acids / Q000494:pharmacology; D008636:Mesencephalon / Q000166:cytology*; D019255:NADPH Oxidases / Q000037:antagonists & inhibitors*; D009474:Neurons / Q000166:cytology* / Q000187:drug effects* / Q000378:metabolism; D015221:Potassium Channels / Q000187:drug effects*; D051381:Rats; D017207:Rats, Sprague-Dawley
D003652:Decanoic Acids; D004791:Enzyme Inhibitors; D006880:Hydroxy Acids; D015221:Potassium Channels; C117780:mitochondrial K(ATP) channel; C052853:5-hydroxydecanoic acid; D019255:NADPH Oxidases; D005905:Glyburide; D004298:Dopamine