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Updated: Mar 21, 2026

Quantitative Immunofluorescence Assay to Measure the Variation in Protein Levels at Centrosomes
Published on: December 20, 2014
HSP70 regulates the function of mitotic centrosomes.
Chieh-Ting Fang1,2, Hsiao-Hui Kuo2, Tiffany S Pan2
1Department of Life Science, National Taiwan University, Taipei, Taiwan.
Heat shock protein (HSP) 70 is crucial for building a functional mitotic spindle. HSP70 ensures proper microtubule assembly and centrosome integrity during cell division.
Area of Science:
- Cell Biology
- Molecular Biology
- Genetics
Background:
- Centrosome maturation is essential for bipolar mitotic spindle formation.
- Mechanisms regulating centrosome maturation and microtubule assembly are not fully understood.
Purpose of the Study:
- To investigate the role of heat shock protein (HSP) 70 in centrosome function during mitosis.
- To determine HSP70's involvement in microtubule nucleation and spindle assembly.
Main Methods:
- Studied HSP70 accumulation at the mitotic centrosome.
- Inhibited or depleted HSP70 to assess its effects on centrosome function.
- Examined interactions between HSP70, NEDD1, and gamma-tubulin (γ-tubulin).
Main Results:
- HSP70 accumulates at the mitotic centrosome during prometaphase and metaphase.
- HSP70 depletion disrupts microtubule nucleation and polymerization, leading to abnormal spindle formation.
- HSP70 associates with NEDD1 and γ-tubulin, and its loss impairs their interaction and centrosomal accumulation.
Conclusions:
- HSP70 is essential for maintaining centrosome integrity during mitosis.
- HSP70 is required for the assembly of a functional bipolar mitotic spindle by regulating microtubule dynamics and centrosome maturation.
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