Hippocampal cell fate regulation by chronic cocaine during periods of adolescent vulnerability: Consequences of cocaine exposure during adolescence on behavioral despair in adulthood
Given that adolescence represents a critical moment for shaping adult behavior and may predispose to disease vulnerability later in life, the aim of this study was to find a vulnerable period during adolescence in which hippocampal cell fate regulation was altered by cocaine exposure, and to evaluat...
| Authors: | , , |
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| Format: | article |
| Publication Date: | 2015 |
| Country: | España |
| Institution: | Conselleria de Salut i Consum del Govern de les Illes Balears |
| Repository: | Docusalut |
| Language: | English |
| OAI Identifier: | oai:docusalut.com:20.500.13003/21624 |
| Online Access: | https://hdl.handle.net/20.500.13003/21624 |
| Access Level: | Open access |
| Keyword: | Cocaine-Related Disorders Hippocampus Depression Cell Proliferation Disease Models, Animal Male Cocaine Neuronal Plasticity Poly (ADP-Ribose) Polymerase-1 Animals Poly(ADP-ribose) Polymerases Fas-Associated Death Domain Protein Rats, Sprague-Dawley Dopamine Uptake Inhibitors Inhibidores de Captación de Dopamina Animales Ratas Sprague-Dawley Proliferación Celular Cocaína Modelos Animales de Enfermedad Masculino Plasticidad Neuronal Hipocampo Depresión Poli(ADP-Ribosa) Polimerasa-1 Poli(ADP-Ribosa) Polimerasas Trastornos Relacionados con Cocaína Proteína de Dominio de Muerte Asociada a Fas |
| Summary: | Given that adolescence represents a critical moment for shaping adult behavior and may predispose to disease vulnerability later in life, the aim of this study was to find a vulnerable period during adolescence in which hippocampal cell fate regulation was altered by cocaine exposure, and to evaluate the long-term consequences of a cocaine experience during adolescence in affecting hippocampal plasticity and behavioral despair in adulthood. Study I: Male rats were treated with cocaine (15mg/kg, i.p.) or saline for 7 consecutive days during adolescence (early post-natal day (PND) 33-39, mid PND 40-46, late PND 47-53). Hippocampal plasticity (i.e., cell fate regulation, cell genesis) was evaluated 24h after the last treatment dose during the course of adolescence (PND 40, PND 47, PND 54). Study II: The consequences of cocaine exposure during adolescence (PND 33-39 or PND 33-46; 7 or 14days) were measured in adulthood at the behavioral (i.e., forced swim test, PND 62-63) and molecular (hippocampal cell markers, PND 64) levels. Chronic cocaine during early adolescence dysregulated FADD forms only in the hippocampus (HC), as compared to other brain regions, and during mid adolescence, impaired cell proliferation (Ki-67) and increased PARP-1 cleavage (a cell death maker) in the HC. Interestingly, chronic cocaine exposure during adolescence did not alter the time adult rats spent immobile in the forced swim test. These results suggest that this paradigm of chronic cocaine administration during adolescence did not contribute to the later manifestation of behavioral despair (i.e., one pro-depressive symptom) as measured by the forced swim test in adulthood. |
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