Macrophage Depletion in the Rat After Intraperitoneal Administration of Liposome-encapsulated Clodronate: Depletion Kinetics and Accelerated Repopulation of Peritoneal and Omental Macrophages by Administration of Freund's Adjuvant

Overview

Journal Cell Tissue Res

Specialties Anatomy & Histology
Cell Biology

Date 1995 Apr 1

PMID 7750133

Citations 39

Authors

J Biewenga

M B van der Ende

L F Krist

A Borst

M Ghufron

N van Rooijen

Affiliations

Soon will be listed here.

Abstract

The purpose of this study was to develop a method for the depletion of macrophages from the peritoneal cavity and the omentum of the rat. Rats received two intraperitoneal injections (at days 0 and 3) with liposome-encapsulated clodronate (dichloromethylene bisphosphonate: Cl2MBP-liposomes). This treatment resulted in complete elimination of mature tissue macrophages (ED2-positive macrophages) from the peritoneal cavity and the omentum within 2 days. The elimination included the strongly ED2-positive spindle-shaped cells of the omental membrane. Repopulation of the omental ED2-positive macrophages was not seen within the next 23 days. Whereas ED2-positive macrophages were completely depleted, few ED1-positive cells remained and repopulation of ED1-positive cells was faster. The treatment further depleted macrophages from the spleen, especially from the red pulp, parathymic lymph nodes and liver. Freund's incomplete adjuvant administered one day after the last injection of Cl2MBP-liposomes considerably accelerated repopulation in the omentum. The protocol described might be used to investigate the contribution of mature tissue macrophages to the induction of immune responses, drug metabolism and the elimination of intestinal tumours.

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