Lysophosphatidic acid‐induced increase in adult hippocampal neurogenesis facilitates the forgetting of cocaine‐contextual memory. (26th February 2018)

• Record Type: Journal Article
• Authors: Ladrón de Guevara‐Miranda, David; Moreno‐Fernández, Román Darío; Gil‐Rodríguez, Sara; Rosell‐Valle, Cristina; Estivill‐Torrús, Guillermo; Serrano, Antonia; Pavón, Francisco J.; Rodríguez de Fonseca, Fernando; Santín, Luis J.; Castilla‐Ortega, Estela
• Is Part Of: Addiction biology. Volume 24:Number 3(2019)
• Page Start: 458
• Page End: 470
• Publication Date: 2018-02-26
• Subjects: antagonist ki16425 -- anxiety -- causal mediation analysis -- cell proliferation -- conditioned place preference (CPP) -- LPA1 receptor; Substance abuse -- Periodicals; Substance abuse -- Physiological aspects -- Periodicals; Substance-Related Disorders -- periodicals; 616.86
• DOI: 10.1111/adb.12612
• Languages: English
• ISSNs: 1355-6215

Abstract

Abstract: Erasing memories of cocaine–stimuli associations might have important clinical implications for addiction therapy. Stimulating hippocampal plasticity by enhancing adult hippocampal neurogenesis (AHN) is a promising strategy because the addition of new neurons may not only facilitate new learning but also modify previous connections and weaken retrograde memories. To investigate whether increasing AHN prompted the forgetting of previous contextual cocaine associations, mice trained in a cocaine‐induced conditioned place preference (CPP) paradigm were administered chronic intracerebroventricular infusions of lysophosphatidic acid (LPA, an endogenous lysophospholipid with pro‐neurogenic actions), ki16425 (an LPA1/3 receptor antagonist) or a vehicle solution, and they were tested 23 days later for CPP retention and extinction. The results of immunohistochemical experiments showed that the LPA‐treated mice exhibited reduced long‐term CPP retention and an approximately twofold increase in the number of adult‐born hippocampal cells that differentiated into mature neurons. Importantly, mediation analyses confirmed a causal role of AHN in reducing CPP maintenance. In contrast, the ki16425‐treated mice displayed aberrant responses, with initially decreased CPP retention that progressively increased across the extinction sessions, leading to no effect on AHN. The pharmacological treatments did not affect locomotion or general exploratory or anxiety‐like responses. In a second experiment, normal and LPA1 ‐receptor‐deficient mice were acutely infused with LPA, which revealed that LPA1 ‐mediated signaling was required for LPA‐induced proliferative actions. These results suggest that the LPA/LPA1 pathway acts as a potent in vivo modulator of AHN and highlight the potential usefulness of pro‐AHN strategies to treat aberrant cognition in those addicted to cocaine. Abstract : Mice trained in a cocaine‐induced conditioned place preference (CPP) paradigm received intracerebroventricular infusions of lysophosphatidic acid (LPA), LPA1/3 receptor antagonist ki16425 or vehicle solution, and they were tested later for CPP retention and extinction. As a main result, the LPA‐induced increase of AHN weakened the long‐term retention of the CPP. Our findings highlight the role of LPA as an in vivo modulator of AHN and suggest the potential usefulness of pro‐AHN strategies to treat the maladaptive cognition in cocaine users.