Ionotropic Glutamate Receptors in Lungs and Airways: Molecular Basis for Glutamate Toxicity

Kathleen G. Dickman, J. Georges Youssef, Suni M. Mathew, Sami I. Said

Research output: Contribution to journalArticlepeer-review

62 Scopus citations


We earlier showed that the ionotropic glutamate receptor agonist N-methyl D-aspartate (NMDA) induces excitotoxic pulmonary edema, and that endogenous activation of NMDA receptors (NMDAR) could mediate lung injury caused by oxidative stress. In this study, we searched for evidence of NMDAR expression in the rat lung and in the alveolar macrophage (AM) cell line NR8383, and for possible regulation of receptor expression by NMDA. The presence of mRNA for NMDAR 1 and the four known NMDAR 2 subtypes (A, B, C, and D) was examined by reverse transcriptase-polymerase chain reaction using isoform-specific primers. NMDAR 1 was expressed in all lung regions examined (peripheral, midlung, and mainstem), as well as in trachea and the AMs. Expression of NMDAR 2A and 2B subtypes was not detected, whereas NMDAR 2C was present only in peripheral and mid-lung samples. NMDAR 2D was the dominant subtype expressed in the peripheral, gas-exchange zone of lung and in alveolar macrophages, and this expression was upregulated in lungs treated with NMDA. Western blot confirmed the presence of NMDAR 1 protein in all lung regions and in AMs. These findings provide a molecular-biological basis for the excitotoxic actions of glutamate in rat lungs and airways, and raise the question of a possible physiologic role for NMDAR in lung and airway function.

Original languageEnglish (US)
Pages (from-to)139-144
Number of pages6
JournalAmerican Journal of Respiratory Cell and Molecular Biology
Issue number2
StatePublished - Feb 2004

ASJC Scopus subject areas

  • Molecular Biology
  • Pulmonary and Respiratory Medicine
  • Clinical Biochemistry
  • Cell Biology


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