Long-term behavioral and biochemical effects of an ultra-low dose of Δ9-tetrahydrocannabinol (THC): Neuroprotection and ERK signaling

Miriam Fishbein, Sahar Gov, Fadi Assaf, Mikhal Gafni, Ora Keren, Yosef Sarne

Research output: Contribution to journalArticlepeer-review

Abstract

We have previously reported that a single injection of an ultra-low dose of delta-9-tetrahydrocannabinol (THC; the psychoactive ingredient of marijuana) protected the brain from pentylenentetrazole (PTZ)- induced cognitive deficits when applied 1-7 days before or 1-3 days after the insult. In the present study we expanded the protective profile of THC by showing that it protected mice from cognitive deficits that were induced by a variety of other neuronal insults, including pentobarbital-induced deep anesthesia, repeated treatment with 3,4 methylenedioxymethamphetamine (MDMA; ''ecstasy'') and exposure to carbon monoxide. The protective effect of THC lasted for at least 7 weeks. The same ultra-low dose of THC (0.002 mg/kg, a dose that is 3-4 orders of magnitude lower than the doses that produce the known acute effects of the drug in mice) induced long-lasting (7 weeks) modifications of extracellular signal-regulated kinase (ERK) activity in the hippocampus, frontal cortex and cerebellum of the mice. The alterations in ERK activity paralleled changes in its activating enzyme MEK and its inactivating enzyme MKP-1. Furthermore, a single treatment with the low dose of THC elevated the level of pCREB (phosphorylated cAMP response element-binding protein) in the hippocampus and the level of BDNF (brain-derived neurotrophic factor) in the frontal cortex. These long-lasting effects indicate that a single treatment with an ultra-low dose of THC can modify brain plasticity and induce longterm behavioral and developmental effects in the brain.

Original languageEnglish
Pages (from-to)437-448
Number of pages12
JournalExperimental Brain Research
Volume221
Issue number4
DOIs
StatePublished - Sep 2012

Keywords

  • Cannabinoid
  • Cognitive deficit
  • Extracellular signal-regulated kinase (ERK)
  • Neuroprotection
  • Preconditioning

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