Abstract
Development of incisional hernia (IH) is multifactorial but inflammation and abdominal wall ECM (extracellular matrix) disorganization are key pathological events. We investigated if the differential expression of fibroblast biomarkers reflects the cellular milieu and the dysregulated ECM in IH tissues. Expression of fibroblast biomarkers, including connective tissue growth factor, alpha-smooth muscle actin (α-SMA), CD34 (cluster of differentiation 34), cadherin-11 and fibroblast specific protein 1 (FSP1), was examined by histology and immunofluorescence in the hernial-fascial ring/neck tissue (HRT) and hernia sack tissue (HST) harvested from the patients undergoing hernia surgery and compared with normal fascia (FT) and peritoneum (PT) harvested from brain-dead healthy subjects undergoing organ procurement for transplantation. The H&E staining revealed alterations in tissue architecture, fibroblast morphology, and ECM organization in the IH tissues compared to control. The biomarker for undifferentiated fibroblasts, CD34, was significantly higher in HST and decreased in HRT than the respective FT and PT controls. Also, the findings revealed an increased level of CTGF (connective tissue growth factor) with decrease in α-SMA in both HRT and HST compared to the controls. In addition, an increased level of FSP1 (fibroblast specific protein 1) and cadherin-11 in HRT with decreased level in HST were observed relative to the respective controls (FT and PT). Hence, these findings support the heterogeneity of fibroblast population at the laparotomy site that could contribute to the development of IH. Understanding the mechanisms causing the phenotype switch of these fibroblasts would open novel strategies to prevent the development of IH following laparotomy.
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There is no restrictions on sharing a de-identified data set (without any identifying or sensitive patient information) on the experiments performed on the human tissues collected and processed in an un-identifiable manner. Such data are now included as Supporting Information Excel file. This file contains: (i) the values behind the means, standard deviations and other measures reported, and (ii) the values used to build graphs.
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Acknowledgements
The authors would like to sincerely acknowledge the staffs of Live on Nebraska (Formerly called NORS (Nebraska Organ Recovery System) for procuring control specimen in this study.
Funding
This research work was supported by NIH-NHLBI grants R01HL147662 and R01HL144125 of DK Agrawal and CU Surgery research funds to Dr. Fitzgibbons. The content of this original article is solely the responsibility of the authors and does not necessarily represent the official views of the NIH.
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Conception and design: FGT, NKL, RJF, DKA; Contributed reagents/ materials/analysis tool: RJF, DKA; Conducting surgeries, analysis, and interpretation of the data: RJF, NKL, FGT, AV, T-NB, MR, DKA; Drafting of the article: FGT, NKL, DKA; Critical revision and editing of the article for important intellectual content: FGT, NKL, RJF, DKA; Final approval of the submitted article: FGT, NKL, AV, T-NB, MR, RJF, DKA.
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The authors report no proprietary or commercial interest in any product mentioned or concept discussed in this article. The authors declare no conflict of interest.
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Institutional Review Board (IRB) of Creighton University approved the study under the IRB protocol (2nd May 2018 to 2nd April 2019) of Robert J. Fitzgibbons, MD, a co-author of this article.
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Patients ≥ 19 years of age, of either sex, who were undergoing repair of their incisional hernia were recruited in the study and informed consents and HIPPA forms were obtained and saved in the office of Robert J. Fitzgibbons, MD. The de-identified tissues were sent to the laboratory for further experiments.
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There is no identifiable images or other personal or clinical details of study participants in the data presented. As the corresponding authors, I verify that all authors significantly contributed to various aspect of the study, have read the manuscript and consented to submit for publication in the Molecular and cellular biochemistry.
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Thankam, F.G., Larsen, N.K., Varghese, A. et al. Biomarkers and heterogeneous fibroblast phenotype associated with incisional hernia. Mol Cell Biochem 476, 3353–3363 (2021). https://doi.org/10.1007/s11010-021-04166-6
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DOI: https://doi.org/10.1007/s11010-021-04166-6