Abstract
The uptake, transport, and secretion processes of hepatocytes probably depends on a contractile system of fibrous proteins similar to those found in other cells. However, the contractile system in in situ liver cells has not been thoroughly investigated. In this report, a network of actin-like filaments was identified in liver cells using the heavy meromyosin binding technique. Actin-like filaments were found in the ectoplasm of the liver cells. These filaments appeared more numerous and thickened when they bound heavy meromyosin. Although they were found over the entire cell periphery they were conspicuous where the plasma membrane faced the space of Disse or the bile canaliculus. Gaps in the filament network were encountered. The filaments appeared to have attachment points to the plasma membrane and the organelles. It is postulated that the actin-like filament network attached to the plasma membrane could provide the motive force for endocytosis, transport of vesicles, and flow of bile.
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