| First Author | Rajput C | Year | 2020 |
| Journal | J Allergy Clin Immunol | Volume | 146 |
| Issue | 3 | Pages | 571-582.e3 |
| PubMed ID | 32344055 | Mgi Jnum | J:337265 |
| Mgi Id | MGI:6819735 | Doi | 10.1016/j.jaci.2020.03.039 |
| Citation | Rajput C, et al. (2020) Early-life heterologous rhinovirus infections induce an exaggerated asthma-like phenotype. J Allergy Clin Immunol 146(3):571-582.e3 |
| abstractText | BACKGROUND: Early-life wheezing-associated respiratory tract infection by rhinovirus (RV) is a risk factor for asthma development. Infants are infected with many different RV strains per year. OBJECTIVE: We previously showed that RV infection of 6-day-old BALB/c mice induces a mucous metaplasia phenotype that is dependent on type 2 innate lymphoid cells (ILC2s). We hypothesized that early-life RV infection alters the response to subsequent heterologous infection, inducing an exaggerated asthma-like phenotype. METHODS: Wild-type BALB/c mice and Rora(fl/fl)Il7r(cre) mice lacking ILC2s were treated as follows: (1) sham on day 6 of life plus sham on day 13 of life, (2) RV-A1B on day 6 plus sham on day 13, (3) sham on day 6 plus RV-A2 on day 13, and (4) RV-A1B on day 6 plus RV-A2 on day 13. RESULTS: Mice infected with RV-A1B at day 6 and sham at day 13 showed an increased number of bronchoalveolar lavage eosinophils and increased expression of IL-13 mRNA but not expression of IFN-gamma mRNA (which is indicative of a type 2 immune response), whereas mice infected with sham on day 6 and RV-A2 on day 13 of life demonstrated increased IFN-gamma expression (which is a mature antiviral response). In contrast, mice infected with RV-A1B on day 6 before RV-A2 infection on day 13 showed increased expression of IL-13, IL-5, Gob5, Muc5b, and Muc5ac mRNA; increased numbers of eosinophils and IL-13-producing ILC2s; and exaggerated mucus metaplasia and airway hyperresponsiveness. Compared with Rora(fl/fl) mice, Rora(fl/fl)Il7r(cre) mice showed complete suppression of bronchoalveolar lavage eosinophils and mucous metaplasia. CONCLUSION: Early-life RV infection alters the response to subsequent heterologous infection, inducing an intensified asthma-like phenotype that is dependent on ILC2s. |
