A novel interaction between aging and ER overload in a protein conformational dementia
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A novel interaction between aging and ER overload in a protein conformational dementia. / Schipanski, Angela; Lange, Sascha; Segref, Alexandra; Gutschmidt, Aljona; Lomas, David A; Miranda, Elena; Schweizer, Michaela; Hoppe, Thorsten; Glatzel, Markus.
in: GENETICS, Jahrgang 193, Nr. 3, 01.03.2013, S. 865-76.Publikationen: SCORING: Beitrag in Fachzeitschrift/Zeitung › SCORING: Zeitschriftenaufsatz › Forschung › Begutachtung
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T1 - A novel interaction between aging and ER overload in a protein conformational dementia
AU - Schipanski, Angela
AU - Lange, Sascha
AU - Segref, Alexandra
AU - Gutschmidt, Aljona
AU - Lomas, David A
AU - Miranda, Elena
AU - Schweizer, Michaela
AU - Hoppe, Thorsten
AU - Glatzel, Markus
PY - 2013/3/1
Y1 - 2013/3/1
N2 - Intraneuronal deposition of aggregated proteins in tauopathies, Parkinson disease, or familial encephalopathy with neuroserpin inclusion bodies (FENIB) leads to impaired protein homeostasis (proteostasis). FENIB represents a conformational dementia, caused by intraneuronal polymerization of mutant variants of the serine protease inhibitor neuroserpin. In contrast to the aggregation process, the kinetic relationship between neuronal proteostasis and aggregation are poorly understood. To address aggregate formation dynamics, we studied FENIB in Caenorhabditis elegans and mice. Point mutations causing FENIB also result in aggregation of the neuroserpin homolog SRP-2 most likely within the ER lumen in worms, recapitulating morphological and biochemical features of the human disease. Intriguingly, we identified conserved protein quality control pathways to modulate protein aggregation both in worms and mice. Specifically, downregulation of the unfolded protein response (UPR) pathways in the worm favors mutant SRP-2 accumulation, while mice overexpressing a polymerizing mutant of neuroserpin undergo transient induction of the UPR in young but not in aged mice. Thus, we find that perturbations of proteostasis through impairment of the heat shock response or altered UPR signaling enhance neuroserpin accumulation in vivo. Moreover, accumulation of neuroserpin polymers in mice is associated with an age-related induction of the UPR suggesting a novel interaction between aging and ER overload. These data suggest that targets aimed at increasing UPR capacity in neurons are valuable tools for therapeutic intervention.
AB - Intraneuronal deposition of aggregated proteins in tauopathies, Parkinson disease, or familial encephalopathy with neuroserpin inclusion bodies (FENIB) leads to impaired protein homeostasis (proteostasis). FENIB represents a conformational dementia, caused by intraneuronal polymerization of mutant variants of the serine protease inhibitor neuroserpin. In contrast to the aggregation process, the kinetic relationship between neuronal proteostasis and aggregation are poorly understood. To address aggregate formation dynamics, we studied FENIB in Caenorhabditis elegans and mice. Point mutations causing FENIB also result in aggregation of the neuroserpin homolog SRP-2 most likely within the ER lumen in worms, recapitulating morphological and biochemical features of the human disease. Intriguingly, we identified conserved protein quality control pathways to modulate protein aggregation both in worms and mice. Specifically, downregulation of the unfolded protein response (UPR) pathways in the worm favors mutant SRP-2 accumulation, while mice overexpressing a polymerizing mutant of neuroserpin undergo transient induction of the UPR in young but not in aged mice. Thus, we find that perturbations of proteostasis through impairment of the heat shock response or altered UPR signaling enhance neuroserpin accumulation in vivo. Moreover, accumulation of neuroserpin polymers in mice is associated with an age-related induction of the UPR suggesting a novel interaction between aging and ER overload. These data suggest that targets aimed at increasing UPR capacity in neurons are valuable tools for therapeutic intervention.
KW - Age Factors
KW - Amino Acid Sequence
KW - Animals
KW - Caenorhabditis elegans
KW - Caenorhabditis elegans Proteins
KW - Endoplasmic Reticulum
KW - Endoplasmic Reticulum Stress
KW - Heat-Shock Response
KW - Hippocampus
KW - Humans
KW - Inclusion Bodies
KW - Mice
KW - Mice, Mutant Strains
KW - Molecular Sequence Data
KW - Neurons
KW - Neuropeptides
KW - Point Mutation
KW - Polymerization
KW - Protein Conformation
KW - Protein Folding
KW - Serpins
KW - Signal Transduction
KW - Unfolded Protein Response
U2 - 10.1534/genetics.112.149088
DO - 10.1534/genetics.112.149088
M3 - SCORING: Journal article
C2 - 23335331
VL - 193
SP - 865
EP - 876
JO - GENETICS
JF - GENETICS
SN - 0016-6731
IS - 3
ER -