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Going with the flow
Date:8/28/2011

ward the spindle," says Yi. When he treated the oocytes with jasplakinolide, an actin filament-stabilizing drug, actin flow in the cells' interior almost immediately ceased.

"The actin flow drives cytoplasmic streaming away from the cortical cap region along the cell periphery. When it arrives at the opposite pole of the oocyte, it circulates back in a pattern similar to that of the actin flow toward the spindle," says Li. A theoretical analysis by physicist and co-author Boris Rubinstein, Ph.D., a research advisor at the Stowers Institute, found that the observed cytoplasmic streaming generates pressure on the spindle and pushes it towards the cortex.

In many vertebrate species including mammals, oocytes may arrest in meiosis II for hours or even days awaiting fertilization. "During this time the asymmetric spindle position must be stably maintained," explains Li. "Maintaining spindle position under an active force could prevent slow and random drift of spindle position or orientation if the meiotic arrest is prolonged."

Loss of asymmetric positioning of the meiosis II spindle is a known cause of impaired reproductive potential in aging females and spindle position is used as a clinical index to evaluate the quality of oocytes arrested in meiosis II for in-vitro fertilization.


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Contact: Gina Kirchweger
gxk@stowers.org
816-806-1036
Stowers Institute for Medical Research
Source:Eurekalert  

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