Cardiomyocyte ryanodine receptor degradation by chaperone-mediated autophagy

Zully Pedrozo, Natalia Torrealba, Carolina Fernández, Damian Gatica, Barbra Toro, Clara Quiroga, Andrea E. Rodriguez, Gina Sanchez, Thomas G. Gillette, Joseph A Hill, Paulina Donoso, Sergio Lavandero

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

Time for primary review: 15 daysAimsChaperone-mediated autophagy (CMA) is a selective mechanism for the degradation of soluble cytosolic proteins bearing the sequence KFERQ. These proteins are targeted by chaperones and delivered to lysosomes where they are translocated into the lysosomal lumen and degraded via the lysosome-associated membrane protein type 2A (LAMP-2A). Mutations in LAMP2 that inhibit autophagy result in Danon disease characterized by hypertrophic cardiomyopathy. The ryanodine receptor type 2 (RyR2) plays a key role in cardiomyocyte excitation-contraction and its dysfunction can lead to cardiac failure. Whether RyR2 is degraded by CMA is unknown.Methods and resultsTo induce CMA, cultured neonatal rat cardiomyocytes were treated with geldanamycin (GA) to promote protein degradation through this pathway. GA increased LAMP-2A levels together with its redistribution and colocalization with Hsc70 in the perinuclear region, changes indicative of CMA activation. The inhibition of lysosomes but not proteasomes prevented the loss of RyR2. The recovery of RyR2 content after incubation with GA by siRNA targeting LAMP-2A suggests that RyR2 is degraded via CMA. In silico analysis also revealed that the RyR2 sequence harbours six KFERQ motifs which are required for the recognition Hsc70 and its degradation via CMA. Our data suggest that presenilins are involved in RyR2 degradation by CMA.ConclusionThese findings are consistent with a model in which oxidative damage of the RyR2 targets it for turnover by presenilins and CMA, which could lead to removal of damaged or leaky RyR2 channels.

Original languageEnglish (US)
Pages (from-to)277-285
Number of pages9
JournalCardiovascular Research
Volume98
Issue number2
DOIs
StatePublished - May 1 2013

Fingerprint

Ryanodine Receptor Calcium Release Channel
Autophagy
Cardiac Myocytes
Lysosome-Associated Membrane Glycoproteins
Presenilins
Lysosomes
Glycogen Storage Disease Type IIb
Hypertrophic Cardiomyopathy
Proteasome Endopeptidase Complex
Computer Simulation
Small Interfering RNA
Proteolysis
Proteins
Heart Failure
Mutation

Keywords

  • Cardiomyocyte
  • Chaperone-mediated autophagy
  • Geldanamycin
  • Protein degradation
  • Ryanodine receptor

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine
  • Physiology (medical)
  • Physiology

Cite this

Pedrozo, Z., Torrealba, N., Fernández, C., Gatica, D., Toro, B., Quiroga, C., ... Lavandero, S. (2013). Cardiomyocyte ryanodine receptor degradation by chaperone-mediated autophagy. Cardiovascular Research, 98(2), 277-285. https://doi.org/10.1093/cvr/cvt029

Cardiomyocyte ryanodine receptor degradation by chaperone-mediated autophagy. / Pedrozo, Zully; Torrealba, Natalia; Fernández, Carolina; Gatica, Damian; Toro, Barbra; Quiroga, Clara; Rodriguez, Andrea E.; Sanchez, Gina; Gillette, Thomas G.; Hill, Joseph A; Donoso, Paulina; Lavandero, Sergio.

In: Cardiovascular Research, Vol. 98, No. 2, 01.05.2013, p. 277-285.

Research output: Contribution to journalArticle

Pedrozo, Z, Torrealba, N, Fernández, C, Gatica, D, Toro, B, Quiroga, C, Rodriguez, AE, Sanchez, G, Gillette, TG, Hill, JA, Donoso, P & Lavandero, S 2013, 'Cardiomyocyte ryanodine receptor degradation by chaperone-mediated autophagy', Cardiovascular Research, vol. 98, no. 2, pp. 277-285. https://doi.org/10.1093/cvr/cvt029
Pedrozo Z, Torrealba N, Fernández C, Gatica D, Toro B, Quiroga C et al. Cardiomyocyte ryanodine receptor degradation by chaperone-mediated autophagy. Cardiovascular Research. 2013 May 1;98(2):277-285. https://doi.org/10.1093/cvr/cvt029
Pedrozo, Zully ; Torrealba, Natalia ; Fernández, Carolina ; Gatica, Damian ; Toro, Barbra ; Quiroga, Clara ; Rodriguez, Andrea E. ; Sanchez, Gina ; Gillette, Thomas G. ; Hill, Joseph A ; Donoso, Paulina ; Lavandero, Sergio. / Cardiomyocyte ryanodine receptor degradation by chaperone-mediated autophagy. In: Cardiovascular Research. 2013 ; Vol. 98, No. 2. pp. 277-285.
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AU - Quiroga, Clara

AU - Rodriguez, Andrea E.

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AB - Time for primary review: 15 daysAimsChaperone-mediated autophagy (CMA) is a selective mechanism for the degradation of soluble cytosolic proteins bearing the sequence KFERQ. These proteins are targeted by chaperones and delivered to lysosomes where they are translocated into the lysosomal lumen and degraded via the lysosome-associated membrane protein type 2A (LAMP-2A). Mutations in LAMP2 that inhibit autophagy result in Danon disease characterized by hypertrophic cardiomyopathy. The ryanodine receptor type 2 (RyR2) plays a key role in cardiomyocyte excitation-contraction and its dysfunction can lead to cardiac failure. Whether RyR2 is degraded by CMA is unknown.Methods and resultsTo induce CMA, cultured neonatal rat cardiomyocytes were treated with geldanamycin (GA) to promote protein degradation through this pathway. GA increased LAMP-2A levels together with its redistribution and colocalization with Hsc70 in the perinuclear region, changes indicative of CMA activation. The inhibition of lysosomes but not proteasomes prevented the loss of RyR2. The recovery of RyR2 content after incubation with GA by siRNA targeting LAMP-2A suggests that RyR2 is degraded via CMA. In silico analysis also revealed that the RyR2 sequence harbours six KFERQ motifs which are required for the recognition Hsc70 and its degradation via CMA. Our data suggest that presenilins are involved in RyR2 degradation by CMA.ConclusionThese findings are consistent with a model in which oxidative damage of the RyR2 targets it for turnover by presenilins and CMA, which could lead to removal of damaged or leaky RyR2 channels.

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