Journal of Toxicologic Pathology
Online ISSN : 1881-915X
Print ISSN : 0914-9198
ISSN-L : 0914-9198
Short Communications
Transient effects of empty liposomes on hepatic macrophage populations in rats
Munmun PervinHossain M. GolbarAlexandra BondocTakeshi IzawaMitsuru KuwamuraJyoji Yamate
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2016 Volume 29 Issue 2 Pages 139-144


Liposomes have been used as a vehicle for encapsulating chemicals or toxins in toxicological studies. We investigated the transient effects of empty liposomes on hepatic macrophages by applying a single intravenous injection at a dose of 10 ml/kg body weight in 6-week-old male F344 rats. One day after injection, the numbers of hepatic macrophages reacting to CD163, CD68, Iba-1, MHC class II, Gal-3 and CD204 were significantly increased in liposome-treated rats. CD163+ Kupffer cells and CD68+ macrophages with increased phagocytic activity in hepatic lobules were most sensitive. The histological architecture of the liver was not changed following liposome injection; however, hepatocytes showed increased proliferating activity, demonstrable with proliferation marker immunostaining and by an increase in gene profiles related to the cell cycle. In the liposome-treated rats, interestingly, AST and ALT values were significantly decreased, and MCP-1, IL-1β and TGF-β1 mRNAs were significantly increased. Collectively, the present study found that hepatic macrophages activated by liposomes can influence liver homeostasis. This information would be useful for background studies on liposomes.

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© 2016 The Japanese Society of Toxicologic Pathology
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