Glucosamine Enhancement of BDNF Expression and Animal Cognitive Function

Molecules. 2020 Aug 12;25(16):3667. doi: 10.3390/molecules25163667.


Brain-derived neurotrophic factor (BDNF) is an important factor for memory consolidation and cognitive function. Protein kinase A (PKA) signaling interacts significantly with BDNF-provoked downstream signaling. Glucosamine (GLN), a common dietary supplement, has been demonstrated to perform a variety of beneficial physiological functions. In the current study, an in vivo model of 7-week-old C57BL/6 mice receiving daily intraperitoneal injection of GLN (0, 3, 10 and 30 mg/animal) was subjected to the novel object recognition test in order to determine cognitive performance. GLN significantly increased cognitive function. In the hippocampus GLN elevated tissue cAMP concentrations and CREB phosphorylation, and upregulated the expression of BDNF, CREB5 and the BDNF receptor TrkB, but it reduced PDE4B expression. With the in vitro model in the HT22 hippocampal cell line, GLN exposure significantly increased protein and mRNA levels of BDNF and CREB5 and induced cAMP responsive element (CRE) reporter activity; the GLN-mediated BDNF expression and CRE reporter induction were suppressed by PKA inhibitor H89. Our current findings suggest that GLN can exert a cognition-enhancing function and this may act at least in part by upregulating the BDNF levels via a cAMP/PKA/CREB-dependent pathway.

Keywords: BDNF; PKA; cognition; glucosamine.

MeSH terms

  • Animals
  • Brain-Derived Neurotrophic Factor / biosynthesis*
  • Cognition / drug effects*
  • Cyclic AMP / metabolism
  • Cyclic AMP Response Element-Binding Protein / metabolism
  • Cyclic AMP-Dependent Protein Kinases / metabolism
  • Glucosamine / pharmacology*
  • Male
  • Membrane Glycoproteins / metabolism
  • Mice
  • Phosphorylation / drug effects
  • Protein-Tyrosine Kinases / metabolism
  • Up-Regulation / drug effects*


  • Bdnf protein, mouse
  • Brain-Derived Neurotrophic Factor
  • Creb1 protein, mouse
  • Cyclic AMP Response Element-Binding Protein
  • Membrane Glycoproteins
  • Cyclic AMP
  • Ntrk2 protein, mouse
  • Protein-Tyrosine Kinases
  • Cyclic AMP-Dependent Protein Kinases
  • Glucosamine