Cited by 27Ubiquitin and proteasome pathwaysParkinson's Disease Mechanisms and TreatmentsAutophagy in Disease and Therapy

Tyrosine Hydroxylase Is Short-Term Regulated by the Ubiquitin-Proteasome System in PC12 Cells and Hypothalamic and Brainstem Neurons from Spontaneously Hypertensive Rats: Possible Implications in Hypertension

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Carbajosa, Nadia A. Longo, Corradi, Gerardo, Verrilli, María A. Lopez, Guil, María J., Vatta, Marcelo S., Gironacci, Mariela M.·2015·PLOS ONE

Abstract

Aberrations in the ubiquitin-proteasome system (UPS) are implicated in the pathogenesis of various diseases. Tyrosine hydroxylase (TH), the rate-limiting enzyme in catecholamines biosynthesis, is involved in hypertension development. In this study we investigated whether UPS regulated TH turnover in PC12 cells and hypothalamic and brainstem neurons from spontaneously hypertensive rats (SHR) and whether this system was impaired in hypertension. PC12 cells were exposed to proteasome or lysosome inhibitors and TH protein level evaluated by Western blot. Lactacystin, a proteasome inhibitor, induced an increase of 86 ± 15% in TH levels after 30 min of incubation, then it started to decrease up to 6 h to reach control levels and finally it rose up to 35.2 ± 8.5% after 24 h. Bafilomycin, a lysosome inhibitor, did not alter TH protein levels during short times, but it increased TH by 92 ± 22% above basal after 6 h treatment. Before degradation proteasome substrates are labeled by conjugation with ubiquitin. Efficacy of proteasome inhibition on TH turnover was evidenced by accumulation of ubiquitinylated TH after 30 min. Further, the inhibition of proteasome increased the quantity of TH phosphorylated at Ser40, which is essential for TH activity, by 2.7 ± 0.3 fold above basal. TH protein level was upregulated in neurons from hypothalami and brainstem of SHR when the proteasome was inhibited during 30 min, supporting that neuronal TH is also short-term regulated by the proteasome. Since the increased TH levels reported in hypertension may result from proteasome dysfunction, we evaluate proteasome activity. Proteasome activity was significantly reduced by 67 ± 4% in hypothalamic and brainstem neurons from SHR while its protein levels did not change. Present findings show that TH is regulated by the UPS. The impairment in proteasome activity observed in SHR neurons may be one of the causes of the increased TH protein levels reported in hypertension.

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Authors
Carbajosa, N. A. L., Corradi, G., Verrilli, M. A. L., Guil, M. J., Vatta, M. S., & Gironacci, M. M.
Affiliations
Consejo Nacional de Investigaciones Científicas y Técnicas (AR)
Corresponding author
Gironacci, Mariela M.
Venue
PLOS ONE
Published
2015-02-24
Volume
10
Issue
2
Pages
e0116597
ISSN
1932-6203 (ISSN-L)
OpenAlex
W2008259882
Cited by
27
References
44
Citations by year
2025: 1 · 2024: 2 · 2022: 3 · 2021: 3 · 2020: 3 · 2019: 6 · 2018: 1 · 2017: 2 · 2016: 4 · 2015: 2
FWCI
1.30
Type
journal article
Language
en
Open access
Locations
  • PLoS ONE (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • Americanae (AECID Library) (submittedVersion, cc-by-nc-sa)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • LA Referencia (Red Federada de Repositorios Institucionales de Publicaciones Científicas) (submittedVersion, cc-by-nc-sa)
  • Greater South Information System
Funders
  • Consejo Nacional de Investigaciones Científicas y Técnicas
  • Universidad de Buenos Aires (CONICET, 20020120100194)
  • Agencia Nacional de Promoción Científica y Tecnológica (PICT-2010-1998, CONICET, PICT 2010)
  • Secretaría de Ciencia y Técnica, Universidad de Buenos Aires
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ubiquitin and proteasome pathways
  • Health Sciences › Medicine › Neurology › Parkinson's Disease Mechanisms and Treatments
  • Health Sciences › Medicine › Epidemiology › Autophagy in Disease and Therapy
Keywords
tyrosine hydroxylase, ubiquitin-proteasome system, proteasome activity, spontaneously hypertensive rats, hypertension, catecholamine synthesis, hypothalamic neurons, brainstem neurons, PC12 cells, lactacystin, bafilomycin, protein turnover
MeSH terms
Acetylcysteine, Animals, Brain Stem, Hypertension, Hypothalamus, Male, Neurons, Rats, Inbred SHR, Tyrosine 3-Monooxygenase, PC12 Cells, Rats, Wistar, Ubiquitin, Proteasome Endopeptidase Complex, Rats, Proteasome Inhibitors

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