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. 1993 Jun 15;292(Pt 3):773–779. doi: 10.1042/bj2920773

Periportal- and perivenous-enriched hepatocyte couplets: differences in canalicular activity and in response to oxidative stress.

J C Wilton 1, J K Chipman 1, C J Lawson 1, A J Strain 1, R Coleman 1
PMCID: PMC1134180  PMID: 8100415

Abstract

Unlike isolated single hepatocytes, hepatocyte couplets retain their apical polarity, and, during short-term culture form an enclosed canalicular space or vacuole between the two adjacent cells into which biliary secretion is initiated. Hepatocyte couplets were prepared after partial collagenase perfusion of rat liver. Centrifugal elutriation was used to fractionate the preparation into six couplet-containing suspensions. Image analysis was used to determine the size of cultured couplets. The size of the couplets ranged from 34.1 +/- 0.76 microns and 684 +/- 24.1 microns 2 (mean length and area respectively +/- S.E.M.) in Fraction 2, to 43.7 +/- 0.57 microns and 1033 +/- 33.8 microns 2 length and area respectively in Fraction 7. Glutamine synthetase activity was assessed in each freshly eluted fraction and was shown to be predominant in Fractions 6 and 7. Pretreatment of rats with CCl4, which selectively destroys perivenous hepatocytes, decreased the proportion of couplets in these fractions by over 67%, and their glutamine synthetase activity by over 97%. It was concluded that Fractions 2 and 3 contained predominantly couplets of Zone 1 (periportal) origin, Fractions 4 and 5 those from Zone 2, and Fractions 6 and 7 predominantly couplets of Zone 3 (perivenous) origin. The development of canalicular secretory activity was assessed in the couplets after a 15 min incubation with a fluorescent bile acid, cholyl-lysyl-fluorescein (CLF). This was sigmoidal in all fractions, but slower in the periportal couplets, taking 5.1 h for 50% to show secretory activity in Fraction 2, compared with 2.7 h for Fraction 7. Incubation of hepatocyte couplets with 1 or 10 microM taurodehydrocholate, a non-toxic bile acid analogue, did not influence the rate of development of accumulation of CLF by the couplets or the area of the canalicular vacuole in any fraction. However, it did decrease the CLF content of couplets incubated with CLF for 15 min to a greater extent in those of perivenous origin. After subjecting the couplets to oxidative stress by incubation with 20 microM menadione (2-methyl-1,4-naphthoquinone), it was evident that periportal couplets were less able to maintain canalicular secretory activity than perivenous couplets.

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Selected References

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