Altered Subcellular Distribution of the 75-kDa DISC1 Isoform, cAMP Accumulation, and Decreased Neuronal Migration in Schizophrenia and Bipolar Disorder: Implications for Neurodevelopment

Autor:	Isaura Meza, Gloria Benítez-King, Jesús Muñoz-Estrada, Carlos Berlanga
Rok vydání:	2015
Předmět:	Gene isoform Bipolar Disorder Nerve Tissue Proteins Biology Microtubules DISC1 Isomerism Neural Stem Cells Cell Movement Microtubule Physiology (medical) Cyclic AMP Humans Pharmacology (medical) RNA Messenger Cells Cultured Neurons Pharmacology Cell migration Original Articles Neural stem cell Cell biology Nasal Mucosa Psychiatry and Mental health Cytoplasm Schizophrenia biology.protein Cell fractionation Homeostasis Subcellular Fractions
Zdroj:	CNS Neuroscience & Therapeutics. 21:446-453
ISSN:	1755-5930
DOI:	10.1111/cns.12377
Popis:	Summary Background DISC1 (Disrupted-In-Schizophrenia-1) is considered a genetic risk factor for schizophrenia (SZ) and bipolar disorder (BD). DISC1 regulates microtubule stability, migration, and cAMP signaling in mammalian cell lines and mouse brain tissue. cAMP is a regulator of microtubule organization and migration in neurons. Aberrant microtubule organization has been observed in olfactory neuronal precursors (ONP) derived from patients with SZ and BD, which suggests involvement of DISC1 and cAMP. However, the biology of DISC1 in the physiopathology of psychiatric conditions remains elusive. Aims Herein, utilizing ONP obtained from SZ, BD patients and healthy subjects, we have studied DISC1 expression, protein levels, and subcellular distribution by qRT-PCR, immunoblotting, subcellular fractionation, and confocal microscopy. Cell migration and cAMP accumulation were assessed by Transwell and PKA competition assays. Results We found increased levels of the 75-kDa DISC1 isoform in total cell extracts of ONP from patients with SZ and BD compared with controls. Subcellular distribution showed a significant decrease of cytoplasmic DISC1 concomitant with its augmented levels in transcription sites. Moreover, significant cAMP accumulation and diminished migration were also observed in patients' cells. Conclusion Alterations of DISC1 levels and its cellular distribution, which negatively modify cAMP homeostasis, microtubule organization, and cell migration, in ONP from patients with SZ and BD, suggest that their presence in early stages of brain development may impact brain maturation and function.
Databáze:	OpenAIRE
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