Protein Aggregation and Autophagy

Centre de génétique et de Physiologie Moélculaires et cellulaires
16 Rue Dubois
Campus de la Doua
69622 Villeurbanne Cedex - Villeurbanne
Site web - -

Principal investigator

Pr Carole Kretz-Remy

From left to right : Mathieu Baritaud, Carole Kretz-Remy, Pascale Muller, Marion Wattin.

Research themes

Whether a protein folds correctly or whether it aggregates is dependent on mutations or modifications but can also be promoted by pH modulation, UV irradiation or heat stresses. Since aggregates can trap transcription factors and/or cytosolic signaling components, they are often toxic for the cell. Cells have therefore adapted various quality control mechanisms to minimize misfolding and to eliminate misfolded and/or aggregated proteins. The three major mechanisms of protein quality control are: molecular chaperones, the ubiquitin-proteasome system and autophagy/lysosome process.

Our group is interested in studying cell response to protein aggregation stresses. We demonstrated that protein aggregation activates NFκB transcription factor that, in turn, activates autophagy. This latter mechanism helps the cells to get rid off protein aggregates. We are studying two aspects of this response.

Our work is supported by the « Université Claude Bernard Lyon I », the « CNRS », the « Comité départemental du Rhône de la Ligue contre le Cancer » and the « Fondation pour la Recherche Médicale ».

Descriptive figure


• Nivon M., Abou-Samra M., Richet E., Arrigo A.-P. and C Kretz-Remy (2012) NF-κB regulates protein quality control after heat stress though modulation of Bag3/HspB8 complex. J Cell Sci, 125, 1141-51.
• Nivon, M., Richet, E., Codogno, P. and C. Kretz-Remy (2009) Autophagy activation by NF-κB is essential for cell survival after heat shock. Autophagy, 5, 766-83.
• Firdaus, W.J.J., Wyttenbach A., Giuliano, P., Kretz-Remy, C., Currie, R.W. and A.-P. Arrigo (2006) Huntingtin inclusion bodies are iron-dependent centers of oxidative events. FEBS J, 273, 5428-41.
• Kretz-Remy C., Munsch B., and A.-P. Arrigo (2001) κB-dependent transcriptional activation during heat shock recovery : thermolability of the NF-κB/IκB complex. J. Biol. Chem., 276,43723-33.

Composition de l'équipe

Pascale Muller, adjointe technique UCB Lyon I
Mathieu Baritaud, post-doctorant (FRM)
Marion Wattin, étudiante M2R (UCB Lyon I)