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Am J Physiol Cell Physiol 279: C369-C374, 2000;
0363-6143/00 $5.00
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Vol. 279, Issue 2, C369-C374, August 2000

Clathrin in mitotic spindles

Curtis T. Okamoto, Jeana McKinney, and Young Y. Jeng

Department of Pharmaceutical Sciences, School of Pharmacy, University of Southern California, Los Angeles, California 90089-9121

Subconfluent cultures of Madin-Darby canine kidney (MDCK) and CV-1 cells were immunostained with two monoclonal antibodies (MAbs), MAb X-22 and MAb 23, against clathrin heavy chain and with polyclonal antiserum against a conserved region of all mammalian clathrin light chains. In interphase MDCK and CV-1 cells, staining by all three antibodies resulted in the characteristic intracellular punctate vesicular and perinuclear staining pattern. In mitotic cells, all three anti-clathrin antibodies strongly stained the mitotic spindle. Staining of clathrin in the mitotic spindle was colocalized with anti-tubulin staining of microtubular arrays in the spindle. Staining of the mitotic spindle was evident in mitotic cells from prometaphase to telophase and in spindles in mitotic cells released from a thymidine-nocodazole block. In CV-1 cells, staining of clathrin in the mitotic spindle was not affected by brefeldin A. On Western blots, clathrin was detected, but not enriched, in isolated spindles. The immunodetection of clathrin in the mitotic spindle may suggest a novel role for clathrin in mitosis. Alternatively, the recruitment of clathrin to the spindle may suggest a novel regulatory mechanism for localization of clathrin in mitotic cells.

Madin-Darby canine kidney cells; CV-1 cells; brefeldin A


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