Antidepressant Effect of Crocus sativus Aqueous Extract and its Effect on CREB, BDNF, and VGF Transcript and Protein Levels in Rat Hippocampus

Drug Res (Stuttg). 2015 Jul;65(7):337-43. doi: 10.1055/s-0034-1371876. Epub 2014 Apr 2.

Abstract

Crocus sativus L., commonly known as saffron, is a perennial stemless herb in Iridaceae family. It has been used in traditional medicine as well as in modern pharmacological studies for variety of conditions including depression. Recent studies have suggested brain-derived neurotrophic factor (BDNF), VGF Neuropeptide, Cyclic-AMP Response Element Binding Protein (CREB) and phospho-CREB (p-CREB) may play roles in depression. In this research the molecular mechanism of antidepressant effect of aqueous extract of saffron and its effect on the levels of BDNF, VGF, CREB and p-CREB in rat hippocampus, were investigated. The aqueous extract of saffron (40, 80 and 160 mg/kg/day) and imipramine 10 mg/kg/day were injected intraperitoneally (i.p.) for 21 days to rats. The FST (forced swimming test) was performed on the days 1(st) and 21(st). The protein expression and transcript levels of BDNF, VGF CREB and phospho-CREB in rat hippocampus, were evaluated using western blot and quantitative reverse transcription-polymerase chain reaction (qRT-PCR). The results of FST showed that saffron reduced the immobility time. The protein levels of BDNF, CREB and p-CREB were significantly increased in saffron treated rats. VGF protein expression was also increased, but not significantly. The transcript levels of BDNF significantly increased. No significant changes in CREB and VGF transcript levels were observed. It was concluded that aqueous extract of saffron has antidepressant effects and the mechanism of its antidepressant effect may be due to increasing the levels of BDNF, VGF, CREB and P-CREB in rat hippocampus.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Antidepressive Agents / pharmacology*
  • Brain-Derived Neurotrophic Factor / biosynthesis*
  • Brain-Derived Neurotrophic Factor / genetics
  • Crocus / chemistry*
  • Cyclic AMP Response Element-Binding Protein / biosynthesis*
  • Cyclic AMP Response Element-Binding Protein / genetics
  • Dose-Response Relationship, Drug
  • Gene Expression / drug effects
  • Hippocampus / drug effects*
  • Hippocampus / metabolism
  • Imipramine / pharmacology
  • Male
  • Neuropeptides / biosynthesis*
  • Neuropeptides / genetics
  • Phosphorylation / drug effects
  • Plant Extracts / pharmacology*
  • RNA, Messenger / metabolism
  • Rats

Substances

  • Antidepressive Agents
  • Brain-Derived Neurotrophic Factor
  • Cyclic AMP Response Element-Binding Protein
  • Neuropeptides
  • Plant Extracts
  • RNA, Messenger
  • Vgf protein, rat
  • BDNF protein, human
  • Imipramine