Abstract
Background
The incidence of obesity-related asthma has shown a remarkable increase.
Objectives
We aimed to explore the role of heat shock protein 72 (Hsp72) and receptor for advanced glycation end products (RAGE) axis with its downstream signaling in the pathogenesis of obesity-related asthma.
Methods
We enrolled a total of 55 subjects and divided them into three groups. Groups I and II included healthy, normal weight (n = 15) and obese (n = 15) subjects, respectively. Twenty-five obese asthmatics (group III) were subdivided into group IIIa (10 patients with mild to moderate asthma) and group IIIb (15 patients with severe asthma). High mobility group box 1 (HMGB1), interleukin 8 (IL-8), monocyte chemoattractant protein 1 (MCP-1), extracellular signal-regulated protein kinases 1 and 2 (ERK1/2), and urinary Hsp72 were immunoassayed. Hydrogen peroxide (H2O2) and free fatty acids (FFAs) levels were photometrically measured. RAGE mRNA expression was relatively quantified by real-time PCR.
Results
We found significant elevations of serum HMGB1, IL-8, MCP1, ERK1/2, FFAs, and H2O2 levels as well as urinary Hsp72 levels in obese subjects compared to healthy control. These were more evident in patients with severe asthma (group IIIb). Multivariate regression analysis identified Hsp72 and ERK1/2 as independent predictors of bronchial asthma severity. Receiver operating characteristic (ROC) curve analysis revealed that areas under the curve (AUC) for Hsp72 and ERK1/2 were 0.991 and 0.981, respectively, which denotes a strong predictive value for identifying the severity of bronchial asthma in obese patients.
Conclusion
The current study highlights the role of Hsp72 and HMGB1/RAGE/ERK1/2 signaling cascade in the pathogenesis of bronchial asthma and its link to obesity, which could be reflected on monitoring, severity grading, and management of this disease.
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The authors would like to express their gratitude toward all patients who participated in the study.
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NAS searched the literature and conducted the work. MTAG, MMA and NAS performed the laboratory and molecular investigations. RME and YMH were involved in patient recruitment. REA and MMA carried out data analysis. NAS wrote the manuscript. All authors reviewed, edited, and approved the final version of the manuscript.
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This study was conducted in accordance with the Helsinki II declaration of good clinical practice. The study obtained approval from the Ethics Committee of the Faculty of Medicine, Tanta University, Tanta, Egypt (approval code: 33460/1/19).
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Each subject signed an informed consent before participating in this study.
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Soliman, N.A., Abdel Ghafar, M.T., El Kolaley, R.M. et al. Cross talk between Hsp72, HMGB1 and RAGE/ERK1/2 signaling in the pathogenesis of bronchial asthma in obese patients. Mol Biol Rep 47, 4109–4116 (2020). https://doi.org/10.1007/s11033-020-05531-2
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DOI: https://doi.org/10.1007/s11033-020-05531-2