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¹H. H. Humphrey Center for Experimental Medicine and Cancer Research, Hebrew University-Hadassah Medical School, Jerusalem, Israel.

Pathology, Research and Practice

|June 1, 1992

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Liver cells

Area of Science:

Hepatology and cell biology
Tissue dynamics and aging

Background:

Hepatocytes and littoral cells in the liver acinus move from the portal tract to the hepatic vein.
This directed movement creates a spatial gradient where cell position correlates with age.

Purpose of the Study:

To introduce a novel method for estimating cell age based on spatial position within the liver acinus.
To define 'biological age' as a cell's location on the tissue radius.

Main Methods:

Utilizing image cytometry to measure cell distance from the tissue origin (portal tract).
Correlating cell position with cell age, defining a 'tissue radius' representing displacement trajectory.
Introducing two units for cell age: chronological (based on velocity) and biological (based on location).

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Main Results:

Cell position on the tissue radius can serve as a proxy for cell age, establishing a 'time dimension' for liver tissue.
Biological age is quantifiable by cell location, with the liver acinus radius averaging 22 locations.
Chronological age can be calculated from displacement velocity (e.g., 2 microns/day for hepatocytes).

Conclusions:

Cellular position within the liver acinus provides a direct measure of biological age, simplifying age assessment.
This spatial-temporal mapping offers a new perspective on liver tissue dynamics and cellular aging processes.
The method allows for age determination from a single tissue section, unlike methods requiring time-series tracking.