Abstract
Golgi apparatus of livers of rats receiving 60 mg/100 g body weight all- trans retinol (vitamin A) in olive oil responded by a reproducible and significant increase both in the number of cisternae per Golgi apparatus stack and in the number of transition vesicles of the cis Golgi apparatus face compared to rats receiving olive oil alone as determined by quantitation from electron micrographs. These vesicles were identified by a simple, non-clathrin coat, a uniform diameter of about 60 nm and a location primarily in association with cis Golgi apparatus elements. They were distinct from clathrin-coated vesicles of the trans Golgi apparatus face which was unaffected by vitamin A treatment. Transition vesicles may be involved in the transfer of membrane materials to the Golgi apparatus from endoplasmic reticulum.
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