Abstract
A mechanical injury in bovine corneal endothelial (BCE) cells in culture induces: (1) a fast calcium wave (FCW); (2) slow increases in cytosolic sodium and calcium, critical for the healing process, and (3) a rise in the apoptotic rate with respect to quiescent cells. In order to investigate the nature of the stimuli that determine the ionic changes and apoptotic response, we performed here studies on a non-injury model of tissue restitution in BCE monolayers. For this, we employed cell cultures grown to confluence in the presence of a Parafilm strip. We observed that, previously to strip removal, most of the border cells had already developed the slow ionic modifications, while in the scratch wounds these changes gradually occur after several hours of healing. This finding suggests that, in BCE cells, the presence of a free edge is sufficient to trigger ionic modifications necessary for wound healing and to elicit an augmented apoptotic response. The apoptotic index of the migrating cells in the Parafilm model (PF) was determined to be approximately two-fold the one of scratch wounds, a result that, in agreement with our previous observations, we attributed to the absence of the FCW in the PF experiments. The findings of this work further contribute to the understanding of epithelial wound healing, a crucial adaptive, and homeostatic response.
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Data that support the findings of this study are available from the authors upon reasonable request.
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Acknowledgements
We thank Drs. Lucía Canclini and Hugo Marcel Rodriguez for expert advice on statistical analysis. We also thank Frigorífico Las Piedras and Frigorífico Lorsinal S.A., for supplying us with fresh bovine eyes.
Funding
This study was supported by grants from the Comisión Sectorial de Investigación Científica (CSIC), Universidad de la República, Uruguay (Proyecto Grupos I + D 2014 to S. Chifflet and Magister and Doctoral Fellowships to C. Justet); and Programa de Desarrollo de las Ciencias Básicas (PEDECIBA), Uruguay (to S. Chifflet and J. A. Hernandez).
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CJ and SC designed research; CJ performed research; CJ, SC and JAH analyzed data; CJ took responsibility for statistical analysis. CJ, SC and JAH wrote the paper.
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Justet, C., Hernández, J.A. & Chifflet, S. Roles of early events in the modifications undergone by bovine corneal endothelial cells during wound healing. Mol Cell Biochem 478, 89–102 (2023). https://doi.org/10.1007/s11010-022-04495-0
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DOI: https://doi.org/10.1007/s11010-022-04495-0