[en] OBJECTIVE: This study aimed to investigate the connection between the mutation of the Sip1 transcription factor and impaired Ca(2+)-signaling, which reflects changes in neurotransmission in the cerebral cortex in vitro. METHODS: We used mixed neuroglial cortical cell cultures derived from Sip1 mutant mice. The cells were loaded with a fluorescent ratiometric calcium-sensitive probe Fura-2 AM and epileptiform activity was modeled by excluding magnesium ions from the external media or adding a GABA(A) receptor antagonist, bicuculline. Intracellular calcium dynamics were recorded using fluorescence microscopy. To identify the level of gene expression, the Real-Time PCR method was used. RESULTS: It was found that cortical neurons isolated from homozygous (Sip1(fl/fl)) mice with the Sip1 mutation demonstrate suppressed Ca(2+) signals in models of epileptiform activity in vitro. Wild-type cortical neurons are characterized by synchronous high-frequency and high-amplitude Ca(2+) oscillations occurring in all neurons of the network in response to Mg(2+)-free medium and bicuculline. But cortical Sip1(fl/fl) neurons only single Ca(2+) pulses or attenuated Ca(2+) oscillations are recorded and only in single neurons, while most of the cell network does not respond to these stimuli. This signal deficiency of Sip1(fl/fl) neurons correlates with a suppressed expression level of the genes encoding the subunits of NMDA, AMPA, and KA receptors; protein kinases PKA, JNK, CaMKII; and also the transcription factor Hif1α. These negative effects were partially abolished when Sip1(fl/fl) neurons are grown in media with anti-inflammatory cytokine IL-10. IL-10 increases the expression of the above-mentioned genes but not to the level of expression in wild-type. At the same time, the amplitudes of Ca(2+) signals increase in response to the selective agonists of NMDA, AMPA and KA receptors, and the proportion of neurons responding with Ca(2+) oscillations to a Mg(2+)-free medium and bicuculline increases. CONCLUSION: IL-10 restores neurotransmission in neuronal networks with the Sip1 mutation by regulating the expression of genes encoding signaling proteins.
Turovskaya, Maria V; Laboratory of Intracellular Signaling, Institute of Cell Biophysics of the
Epifanova, Ekaterina ; Université de Liège - ULiège > Département des sciences biomédicales et précliniques ; Laboratory of Genetic Engineering Technologies, Lobachevsky State University of
Tarabykin, Victor S; Laboratory of Genetic Engineering Technologies, Lobachevsky State University of
Babaev, Alexei A; Laboratory of Genetic Engineering Technologies, Lobachevsky State University of
Turovsky, Egor A ; Laboratory of Intracellular Signaling, Institute of Cell Biophysics of the ; Laboratory of Genetic Engineering Technologies, Lobachevsky State University of
Language :
English
Title :
Interleukin-10 restores glutamate receptor-mediated Ca(2+)-signaling in brain circuits under loss of Sip1 transcription factor.
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