Human placental extracts are known to help wound healing. Rapid migration of neutrophils to the wound site is a prerequisite
to the wound healing process. Gel filtration analysis of heat-treated placental extract gave the initial cue to the small
nature of the migration promoting factor of the extract. HPLC analysis of the extract revealed glutamate to be the predominant
free amino acid. Our studies show that glutamate at an optimum concentration of 8 μM induced phenotypic neutrophil chemotaxis,
as seen in the time lapse and transwell assays. Glutamate was also found to induce chemokinesis of the neutrophil, though
the stimulation of chemotaxis was more pronounced. The glutamate induced chemotaxis was accompanied by polarization of the
actin cytoskeleton, and by polymerization of F-actin. These data indicate that glutamate has a strong chemotactic functionality
in the neutrophil, which could be of interest both therapeutically and in further investigation of the molecular basis of
chemotaxis.
Keywords Chemoattractant - Migration - Polarization - Neurotransmitter
An erratum to this article can be found at
http://dx.doi.org/10.1007/s00726-009-0456-z