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- Title
MICB Genomic Variant Is Associated with NKG2D-mediated Acute Lung Injury and Death.
- Authors
Aguilar, Oscar A.; Qualls, Anita E.; Gonzalez-Hinojosa, Maria D. R.; Obeidalla, Sarah; Kerchberger, V. Eric; Tsao, Tasha; Singer, Jonathan P.; Looney, Mark R.; Raymond, Wilfred; Hays, Steven R.; Golden, Jeffrey A.; Kukreja, Jasleen; Shaver, Ciara M.; Ware, Lorraine B.; Christie, Jason; Diamond, Joshua M.; Lanier, Lewis L.; Greenland, John R.; Calabrese, Daniel R.
- Abstract
Rationale: Acute lung injury (ALI) carries a high risk of mortality but has no established pharmacologic therapy. We previously found that experimental ALI occurs through natural killer (NK) cell NKG2D receptor activation and that the cognate human ligand, MICB, was associated with ALI after transplantation. Objectives: To investigate the association of a common missense variant, MICBG406A, with ALI. Methods: We assessed MICBG406A genotypes within two multicenter observational study cohorts at risk for ALI: primary graft dysfunction (N= 619) and acute respiratory distress syndrome (N= 1,376). Variant protein functional effects were determined in cultured and ex vivo human samples. Measurements and Main Results: Recipients of MICBG406Ahomozygous allografts had an 11.1% absolute risk reduction (95% confidence interval [CI], 3.2-19.4%) for severe primary graft dysfunction after lung transplantation and reduced risk for allograft failure (hazard ratio, 0.36; 95% CI, 0.13-0.98). In participants with sepsis, we observed 39% reduced odds of moderately or severely impaired oxygenation among MICBG406A-homozygous individuals (95% CI, 0.43-0.86). BAL NK cells were less frequent and lessmature in participants with MICBG406A. Expression of missense variant proteinMICBD136N in cultured cells resulted in reduced surface MICB and reduced NKG2D ligation relative to wild-type MICB. Coculture of variantMICBD136N cells with NK cells resulted in less NKG2D activation and less susceptibility to NK cell killing relative to the wild-type cells. Conclusions: These data support a role for MICB signaling through the NKG2D receptor in mediating ALI, suggesting a novel therapeutic approach.
- Subjects
ADULT respiratory distress syndrome; LUNG injuries; KILLER cells; MISSENSE mutation; LUNG transplantation
- Publication
American Journal of Respiratory & Critical Care Medicine, 2024, Vol 209, Issue 1, p70
- ISSN
1073-449X
- Publication type
Article
- DOI
10.1164/rccm.202303-0472OC