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Molecular Medicine

, Volume 20, Issue 1, pp 417–426 | Cite as

Regulation of Autophagy by α1-Antitrypsin: “A Foe of a Foe Is a Friend”

  • Michal G. Shapira
  • Boris Khalfin
  • Eli C. Lewis
  • Abraham H. Parola
  • Ilana Nathan
Research Article

Abstract

Autophagy is involved in both the cell protective and the cell death process but its mechanism is largely unknown. The present work unravels a novel intracellular mechanism by which the serpin α1-antitrypsin (AAT) acts as a novel negative regulator of autophagic cell death. For the first time, the role of intracellularly synthesized AAT, other than in liver cells, is demonstrated. Autophagic cell death was induced by N-α-tosyl-L-phenylalanine chloromethyl ketone (TPCK) and tamoxifen. By utilizing a fluorescently tagged TPCK analog, AAT was “fished out” (pulled out) as a TPCK intracellular protein target. The interaction was further verified by competition binding experiments. Both inducers caused downregulation of AAT expression associated with activation of trypsin-like proteases. Furthermore, silencing AAT by siRNA induced autophagic cell death. Moreover, AAT administration to cultured cells prevented autophagic cell death. This new mechanism could have implications in the treatment of diseases by the regulation of AAT levels in which autophagy has a detrimental function. Furthermore, the results imply that the high synthesis of endogenous AAT by cancer cells could provide a novel resistance mechanism of cancer against autophagic cell death.

Notes

Acknowledgments

We are grateful to Zbigniew Darzynkiewicz from the Brander Cancer Research Institute at the New York Medical College for providing us with FSFCK and TRFCK and for his giving advice. The financial support of the James-Frank Center for Laser-Matter Interaction, the Edmund Safra Foundation for Functional Biopolymers and the NYUSH research grant to AH Parola are gratefully acknowledged.

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Authors and Affiliations

  1. 1.Department of Chemistry, Faculty of Natural SciencesBen-Gurion University of the NegevBeer-ShevaIsrael
  2. 2.Department of Clinical Biochemistry and Pharmacology, Faculty of Health SciencesBen-Gurion University of the NegevBeer-ShevaIsrael
  3. 3.New York University ShanghaiShanghaiPeople’s Republic of China
  4. 4.Soroka University Medical CenterBeer-ShevaIsrael

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