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Sculpturing digit shape by cell death

  • Unusual Model Systems for Cell Death Research
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Abstract

Physiological cell death is a key mechanism that ensures appropriate development and maintenance of tissues and organs in multicellular organisms. Most structures in the vertebrate embryo exhibit defined areas of cell death at precise stages of development. In this regard the areas of interdigital cell death during limb development provide a paradigmatic model of massive cell death with an evident morphogenetic role in digit morphogenesis. Physiological cell death has been proposed to occur by apoptosis, cellular phenomena genetically controlled to orchestrate cell suicide following two main pathways, cytochrome C liberation from the mitochondria or activation of death receptors. Such pathways converge in the activation of cysteine proteases known as caspases, which execute the cell death program, leading to typical morphologic changes within the cell, termed apoptosis. According to these findings it would be expected that caspases loss of function experiments could cause inhibition of interdigital cell death promoting syndactyly phenotypes. A syndactyly phenotype is characterized by absence of digit freeing during development that, when caused by absence of interdigital cell death, is accompanied by the persistence of an interdigital membrane. However this situation has not been reported in any of the KO mice or chicken loss of function experiments ever performed. Moreover histological analysis of dying cells within the interdigit reveals the synchronic occurrence of different types of cell death. All these findings are indicative of caspase alternative and/or complementary mechanisms responsible for physiological interdigital cell death. Characterization of alternative cell death pathways is required to explain vertebrate morphogenesis. Today there is great interest in cell death via autophagy, which could substitute or act synergistically to the apoptotic pathway. Here we discuss what is known about physiological cell death in the developing interdigital tissue of vertebrate embryos, paying special attention to the avian species.

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Acknowledgments

Thanks are due to Montse Fernandez-Calderón and Sonia Pérez-Mantecón for excellent technical support. JAM and JMH work is supported respectively by grants BFU2005-04393 and BFU2008-03930 from the Spanish Sciences and Innovation Ministry.

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Authors and Affiliations

  1. Departamento de Anatomía y Biología Celular, Universidad de Cantabria/IFIMAV, 39011, Santander, Spain

    Juan A. Montero & Juan M. Hurlé

  2. Facultad de Medicina, Universidad de Cantabria/IFIMAV, C/Cardenal Herrera Oria s/n, 39011, Santander, Spain

    Juan M. Hurlé

Authors
  1. Juan A. Montero
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  2. Juan M. Hurlé
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Correspondence to Juan M. Hurlé.

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Montero, J.A., Hurlé, J.M. Sculpturing digit shape by cell death. Apoptosis 15, 365–375 (2010). https://doi.org/10.1007/s10495-009-0444-5

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  • DOI: https://doi.org/10.1007/s10495-009-0444-5

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