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Assaying Protein Kinase Activity with Radiolabeled ATP
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Protein kinase C activator bryostatin-1 modulates proteasome function.

Tapan K Khan1, Thomas J Nelson1

  • 1Center for Neurodegenerative Diseases, Blanchette Rockefeller Neurosciences Institute, West Virginia University, Morgantown, West Virginia.

Journal of Cellular Biochemistry
|April 26, 2018
PubMed
Summary
This summary is machine-generated.

Bryostatin-1 enhances proteasome activity at low concentrations by modulating protein kinase C (PKC) in live cells, but not in cell lysates. This suggests a potential therapeutic strategy for age-related diseases linked to impaired proteasome function.

Keywords:
Bryostatin-1anti-agingdermal fibroblastsproteasomeprotein kinase C

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cellular Biology

Background:

  • The ubiquitin-proteasome pathway maintains protein homeostasis by clearing damaged proteins.
  • Declining proteasome activity is linked to cellular senescence, aging, and age-related diseases.
  • Enhancing proteasome function is a key research area for therapeutic interventions.

Purpose of the Study:

  • To investigate the effect of Bryostatin-1 on proteasome activity.
  • To determine the concentration-dependent effects of Bryostatin-1 on proteasome function.
  • To elucidate the mechanism underlying Bryostatin-1's modulation of proteasome activity.

Main Methods:

  • Assessed chymotrypsin-like proteasome activity in cultured skin fibroblasts and neuron-like differentiated SH-SY5Y cells.
  • Tested Bryostatin-1 across a range of concentrations (sub-nanomolar to micromolar).
  • Investigated Bryostatin-1's effect on cell lysates versus live cell cultures and utilized PKC inhibitors.

Main Results:

  • Bryostatin-1 (0.3–30 nM) significantly increased proteasome activity in live cells.
  • Higher micromolar concentrations of Bryostatin-1 decreased proteasome activity.
  • Bryostatin-1 modulated proteasome activity only in live cells, not in cell lysates, and this effect was blocked by PKC inhibitors.

Conclusions:

  • Bryostatin-1 enhances proteasome activity at specific low concentrations through a PKC-dependent mechanism in live cells.
  • The findings suggest Bryostatin-1's potential for modulating proteostasis in conditions associated with impaired proteasome function.
  • Cellular context is crucial for Bryostatin-1's effect on proteasome activity.