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The epithelium has an apico-basal axis polarity that plays an important role in absorption, excretion and other physiological functions. In epithelial cells, a substantial number of non-centrosomal microtubules (MTs) are scattered in the cytoplasm with an apico-basal polarity and reorientate as epithelial cells perform different functions. Several previous studies have found that non-centrosomal MTs are nucleated at the centrosome, and then released and translocated elsewhere. However, the detailed process and molecular mechanism remain largely unknown. In this study, we found that Nezha, also called calmodulin-regulated spectrin-associated protein 3 (CAMSAP3), a non-centrosomal MT minus-end protein, accumulates in the pericentrosomal area and accompanies the release of MTs from the centrosome; whereas depletion of CAMSAP3 prevented MT release and instead caused focusing of MTs at centrosomes. Further studies demonstrated that CAMSAP3 precisely coordinates with dynein and katanin to regulate the MT detachment process. In conclusion, our results indicate that CAMSAP3 is a key molecule for generation of non-centrosomal MTs.

CAMSAP3 accumulates in the pericentrosomal area and accompanies microtubules release from the centrosome via katanin