Abstract
Background
Asthma is a common respiratory disease caused by genetic and environmental factors, but the contribution of insulin use to the risk of asthma remains unclear. This study aimed to investigate the association between insulin use and asthma in a large population-based cohort, and further explore their causal relationship by Mendelian randomization (MR) analysis.
Methods
An epidemiological study including 85,887 participants from the National Health and Nutrition Examination Survey (NHANES) 2001–2018 was performed to evaluate the association between insulin use and asthma. Based on the inverse-variance weighted approach, MR analysis were conducted to estimate the causal effect of insulin use on asthma from the UKB and FinnGen datasets, respectively.
Results
In the NHANES cohort, we found that insulin use was associated with an increased risk of asthma [odd ratio (OR) 1.38; 95% CI 1.16–1.64; p < 0.001]. For the MR analysis, we found a causal relationship between insulin use and a higher risk of asthma in both Finn (OR 1.10; p < 0.001) and UK Biobank cohorts (OR 1.18; p < 0.001). Meanwhile, there was no causal association between diabetes and asthma. After multivariable adjustment for diabetes in UKB cohort, the insulin use remained significantly associated with an increased risk of asthma (OR 1.17, p < 0.001).
Conclusions
An association between insulin use and an increased risk of asthma was found via the real-world data from the NHANES. In addition, the current study identified a causal effect and provided a genetic evidence of insulin use and asthma. More studies are needed to elucidate the mechanisms underlying the association between insulin use and asthma.
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Data Availability
GWAS data are available through the MRC IEU Open GWAS database (https://gwas.mrcieu.ac.uk/). NHANES data are publicly available through the Center for Disease Control (https://wwwn.cdc.gov/nchs/nhanes/).
Abbreviations
- MR:
-
Mendelian randomization
- NHANES:
-
National Health and Nutrition Examination Survey
- OR:
-
Odd ratio
- SNPs:
-
Single nucleotide polymorphisms
- PSU:
-
Primary sampling units
- SE:
-
Standard errors
- CDC:
-
Centers for Disease Control and Prevention
- GWAS:
-
Genome-wide association studies
- IEU:
-
Integrative Epidemiology Unit
- UKB:
-
UK Biobank
- LD:
-
Linkage disequilibrium
- IVW:
-
Inverse variance weighting
- MVMR:
-
Multivariable Mendelian randomization
- CI:
-
Confidence intervals
- Th2:
-
T helper type 2
- T1DM:
-
Type 1 diabetes
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This work was supported by the Incubation Program for Distinguished Young Scholars by Guangzhou Medical University (GMU2020-207).
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Study design: RC, SL, ZL, JH, SX; Data collection: JH, SX, ZZ; Data analyses: ZL, SX, TK; Results visualization: ZL, JH, Results interpretations: All authors; Manuscript writing: ZL, JH, SX; Manuscript revising: RC, SL. All authors approved the final version of the manuscript.
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Lin, Z., Huang, J., Xie, S. et al. The Association Between Insulin Use and Asthma: An Epidemiological Observational Analysis and Mendelian Randomization Study. Lung 201, 189–199 (2023). https://doi.org/10.1007/s00408-023-00611-z
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DOI: https://doi.org/10.1007/s00408-023-00611-z