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Small ; 15(15): e1900147, 2019 04.
Artigo em Inglês | MEDLINE | ID: mdl-30891923

RESUMO

The use of graphene nanomaterials (GNMs) for biomedical applications targeted to the central nervous system is exponentially increasing, although precise information on their effects on brain cells is lacking. In this work, the molecular changes induced in cortical astrocytes by few-layer graphene (FLG) and graphene oxide (GO) flakes are addressed. The results show that exposure to FLG/GO does not affect cell viability or proliferation. However, proteomic and lipidomic analyses unveil alterations in several cellular processes, including intracellular Ca2+ ([Ca2+ ]i ) homeostasis and cholesterol metabolism, which are particularly intense in cells exposed to GO. Indeed, GO exposure impairs spontaneous and evoked astrocyte [Ca2+ ]i signals and induces a marked increase in membrane cholesterol levels. Importantly, cholesterol depletion fully rescues [Ca2+ ]i dynamics in GO-treated cells, indicating a causal relationship between these GO-mediated effects. The results indicate that exposure to GNMs alters intracellular signaling in astrocytes and may impact astrocyte-neuron interactions.


Assuntos
Astrócitos/metabolismo , Cálcio/metabolismo , Membrana Celular/metabolismo , Colesterol/metabolismo , Grafite/farmacologia , Homeostase , Animais , Astrócitos/citologia , Astrócitos/efeitos dos fármacos , Sinalização do Cálcio/efeitos dos fármacos , Ciclo Celular/efeitos dos fármacos , Membrana Celular/efeitos dos fármacos , Proliferação de Células/efeitos dos fármacos , Sobrevivência Celular/efeitos dos fármacos , Células Cultivadas , Homeostase/efeitos dos fármacos , Espaço Intracelular/metabolismo , Lipidômica , Proteoma/metabolismo , Ratos Sprague-Dawley
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