Apoptosis

, Volume 15, Issue 10, pp 1197–1210 | Cite as

Coordinated and sequential activation of neutral and acidic DNases during interdigital cell death in the embryonic limb

  • J. A. Montero
  • C. I. Lorda-Diez
  • A. C. Certal
  • N. Moreno
  • J. Rodriguez-Leon
  • A. Torriglia
  • J. M. Hurle
Original Paper

Abstract

Interdigital tissue regression during embryonic development is one of the most representative model systems of morphogenetic cell death, but the degenerative cascade accounting for this process awaits clarification. Although the canonical apoptotic caspase pathway appears to be activated in the interdigital mesenchyme committed to die, neither genetic nor chemical blockage of caspases or their downstream effectors, is sufficient to prevent cell death. Hence, alternative and/or complementary dying pathways must also be responsible for this degenerative process. In this work we have chosen to study the endonucleases during the regression of the interdigital tissue of avian embryos to gain insights into the molecular mechanisms accounting for programmed cell death in this system. We show that caspase activated DNase, which is a neutral DNase associated with the caspase apoptotic pathway, appears to be the main endonuclease only at an initial phase of interdigit regression. However at peak stages of the degenerative process, the acidic DNases L-DNase II and lysosomal DNase IIB become predominant in the system and markers for cell autophagy become moderately up-regulated. Consistent with the activation of acidic endonucleases we observed that microenvironmental pH value in the interdigits decreased to levels only appropriate for acidic enzymes. Furthermore, we found that overexpression of lysosomal DNase IIB in embryonic limb mesoderm promoted cell death, which was also accompanied by up-regulation and activation of L-DNase II. Up-regulation of acidic DNases was maintained in interdigits explanted to culture dishes, where the participation of exogenous professional phagocytes of hematopoietic origin is avoided. Finally, and consistent with all our findings, up-regulation of acidic DNases was much reduced in the webbed interdigits of duck embryos, characterized by a rudimentary interdigital degenerative process. We conclude that the regression of the interdigital tissue involves a coordinated and sequential activation of the caspase and lysosomal degenerative molecular cascades.

Keywords

Apoptosis Autophagy LC3B Caspases Sequestosome Lysosomes Serpin B1 Programmed cell death 

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Copyright information

© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  • J. A. Montero
    • 1
  • C. I. Lorda-Diez
    • 1
  • A. C. Certal
    • 2
  • N. Moreno
    • 2
  • J. Rodriguez-Leon
    • 3
  • A. Torriglia
    • 4
  • J. M. Hurle
    • 1
  1. 1.Departamento de Anatomía y Biología Celular, Facultad de MedicinaUniversidad de Cantabria/IFIMAVSantanderSpain
  2. 2.Instituto Gulbenkian de CiênciaOeirasPortugal
  3. 3.Departamento de Anatomía, Biología Celular y ZoologíaUniversidad de ExtremaduraBadajozSpain
  4. 4.INSERM UMRS 872 eq 17ParisFrance

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