Abstract
Severe acute pancreatitis (SAP) associated acute lung injury (ALI) accounts for about 70% mortality of SAP patients. However, there are no precise biomarkers for the disease currently. Herein, we evaluated the potential of gamma-enolase (ENO2), against its universal isoform alpha-enolase (ENO1), as a marker of SAP–ALI in a rat model. Firstly, 16 male Sprague–Dawley rats were randomly divided into two groups, Sham (n = 8) and SAP–ALI (n = 8), for pancreatitis induction. Ultra-structure examination by electron microscopy and HE staining were used for lung injury assessment. Lung tissue expressions of alpha-enolase and gamma-enolase were evaluated by qRT-PCR and immunohistochemistry. In a prospective validation experiment, 28 rats were used: sham (n = 8), SAP–ALI at 3 h (3 h, n = 10), and SAP–ALI at 24 h (24 h, n = 10). Lung tissue damage, tissue expression and circulating alpha-enolase and gamma-enolase levels were evaluated. Elevated serum levels of α-amylase and TNF-α were observed in SAP rats but not in sham-operated rats. Histological examination of pancreatic and lung tissues indicated marked damage in SAP rats. While alpha-enolase was universally expressed, gamma-enolase was expressed only in damaged lung tissues. Gamma-enolase was detected in lung tissues, BALF, and serum as early as 3 h post-surgery when physical pathological damage was not apparent. Unlike alpha-enolase, secreted and/or circulating gamma-enolase level progressively increased, especially in serum, as lung damage progressed. Thus, gamma-enolase may signal and correlate lung tissue damage well before obvious physical pathological tissue damage and might be a candidate diagnostic and/or prognostic marker.
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Acknowledgements
Support for this study was by a grant from the National Natural Science Foundation of China (No. 81573751) to HC. However, the funding body had no influence on the study design, data interpretation, or manuscript preparation.
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LO and HC conceived and designed the experiment; CX, GL, JZ, ZT, ZS and LO carried out the animal model and sample collections; LO, CX, ZT, JZ and ZS carried out validation experiments; HC secured funding for the study, and with LO drafted the manuscript; All authors critically reviewed and approved the final manuscript.
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Owusu, L., Xu, C., Chen, H. et al. Gamma-enolase predicts lung damage in severe acute pancreatitis-induced acute lung injury. J Mol Hist 49, 347–356 (2018). https://doi.org/10.1007/s10735-018-9774-3
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DOI: https://doi.org/10.1007/s10735-018-9774-3