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AJP - Lung Cellular and Molecular Physiology, Vol 266, Issue 3 278-L286, Copyright © 1994 by American Physiological Society
ARTICLES |
S. Becker, J. Quay, H. S. Koren and J. S. Haskill
TCR Environmental Corporation, Chapel Hill 27514.
Constitutive expression of mRNAs for GRO alpha, GRO beta, GRO gamma, and MCP-1, belonging to the chemokine family of 8- to 10-kDa cytokines with chemotactic properties for granulocytes and monocytes, has been identified in freshly isolated human nasal and bronchial epithelium, and in bronchoalveolar macrophages (AM). Expression of GRO alpha, GRO gamma, and MCP-1, but not GRO beta, was found in airway epithelial cells. AM expressed all three GRO genes in addition to MCP-1. On reverse transcription, chemokine mRNAs yielded 0.5-30 cDNA molecules/cell, depending on the chemokine and cell type, as determined by a semiquantitative reverse transcriptase-polymerase chain reaction technique. When chemokine mRNA expression in AM and bronchial epithelium from healthy nonatopic individuals was compared, AM expressed more GRO alpha, but similar levels of GRO gamma, MCP-1, and interleukin-8 (IL-8), as in the bronchial epithelial cells. Modulation of chemokine expression by tumor necrosis factor-alpha (TNF-alpha; 10 ng/ml) or endotoxin [lipopolysaccharide (LPS), 100 ng/ml] exposure was studied in primary nasal epithelial cell and alveolar macrophage cultures. In epithelial cells, LPS did not induce chemokine expression but GRO alpha, IL-8, and MCP-1 were upregulated approximately 100-fold by TNF alpha; GRO gamma expression was elevated only 1.5- to 4-fold. In AM cultures, all three GROs were strongly induced by LPS with peak mRNA expression 24 h after stimulation (approximately 50- to 100-fold increase compared with control cultures). MCP-1 mRNA expression, on the other hand, was not increased by LPS in AM. GRO protein was present in supernatants of stimulated epithelial cells and AM.(ABSTRACT TRUNCATED AT 250 WORDS)
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