Am. J. Respir. Crit. Care Med., Volume 162, Number 6, December 2000, 2117-2124

Polymorphism of the ₂-Adrenergic Receptor Gene and Desensitization in Human Airway Smooth Muscle

PAUL E. MOORE, JOHANNE D. LAPORTE, JOSEPH H. ABRAHAM, IGOR N. SCHWARTZMAN, CHANDRI N. YANDAVA, ERIC S. SILVERMAN, JEFFREY M. DRAZEN, MATTHEW P. WAND, REYNOLD A. PANETTIERI Jr., and STEPHANIE A. SHORE

Departments of Environmental Physiology and Biostatistics, Harvard School of Public Health, and Department of Pulmonary and Critical Care Medicine, Brigham and Women's Hospital, Boston, Massachusetts; and Department of Pulmonary and Critical Care Medicine, University of Pennsylvania, Philadelphia, Pennsylvania

We examined the influence of two common polymorphic forms of the ₂-adrenergic receptor (₂AR): the Gly16 and Glu27 alleles, on acute and long-term ₂AR desensitization in human airway smooth muscle (HASM) cells. In cells from 15 individuals, considered without respect to genotype, pretreatment with Isoproterenol (ISO) at 10⁷ M for 1 h or 24 h caused approximately 25% and 64% decreases in the ability of subsequent ISO (10⁶ M) stimulation to reduce HASM cell stiffness as measured by magnetic twisting cytometry. Similar results were obtained with ISO-induced cyclic adenosine monophosphate (cAMP) as the outcome indicator. Data were then stratified post hoc by genotype. Cells containing at least one Glu27 allele (equivalent to presence of the Gly16Glu27 haplotype) showed significantly greater acute desensitization than did cells with no Glu27 allele, whether ISO-induced cell stiffness (34% versus 19%, p < 0.03) or cAMP formation (58% versus 11%, p < 0.02) was measured. Likewise, cells with any Glu27 allele showed greater long-term desensitization of cell stiffness and cAMP formation responses than did cells without the Glu27 allele. The distribution of genotypes limited direct conclusions about the influence of the Gly16 allele. However, presence of the Gly16Gln27 haplotype was associated with less acute and long-term desensitization of ISO-induced cAMP formation than was seen in cells without the Gly16Gln27 haplotype (14% versus 47%, p < 0.09 for short-term desensitization; 32% versus 84%, p < 0.01 for long-term desensitization), suggesting that the influence of Glu27 is not through its association with Gly16. The Glu27 allele was in strong linkage disequilibrium with the Arg19 allele, a polymorphic form of the ₂AR upstream peptide of the 5'-leader cistron of the ₂AR, and this polymorphism in the ₂AR 5'-flanking region may explain the effects of the Glu27 allele. Cells with any Arg19 allele showed significantly greater acute and long-term desensitization of ISO-induced cAMP formation than did cells without the Arg19 allele (54% versus 2%, p < 0.01 for short-term desensitization; 73% versus 35%, p < 0.05 for long-term desensitization). Similar results were obtained for ISO-induced changes in cell stiffness. Thus, the presence of the Glu27 allele is associated with increased acute and long-term desensitization in HASM.

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