IJCEP Copyright © 2007-All rights reserved.
Int J Clin Exp Pathol 2013;6(6):1028-1037

Original Article
Trophoblasts-derived chemokine CCL24 promotes the proliferation, growth and
apoptosis of decidual stromal cells in human early pregnancy

Hui Li, Yuan-Hua Huang, Ming-Qing Li, Yu-Han Meng, Xuan Chen, Jun Shao, Chuan-Ling Tang, Mei-Rong Du, Li-Ping Jin, Da-Jin Li
Laboratory for Reproductive Immunology, Hospital & Institute of Obstetrics and Gynecology, IBS, Fudan University Shanghai Medical College,
Shanghai 200011, China. The authors contribute equally to the study.

Received April 13, 2013; Accepted May 5, 2013; Epub May 15, 2013; Published June 1, 2013

Abstract: Chemokine CCL24 is the second member of eotaxins, a group of eosinophils’ selectively chemoattractants. Via binding to its only
receptor CCR3, CCL24 mainly mediates atopic disorders, parasitic infections and systemic diseases. It is well-known that CCR3 is expressed
at the maternal-fetal interface; nevertheless whether CCL24 is located there and which role CCL24/CCR3 axis played is unclear. In this article,
we assessed the expression of CCL24 and CCR3 in decidual stromal cells (DSCs) and trophoblasts, investigated the effects of DSCs-
trophoblasts contact and pregnancy-associated hormones on the expression of CCR3 by DSCs, and last examined the role of trophoblasts-
derived CCL24 on the proliferation, cell numbers and apoptosis of DSCs in vitro. We found that trophoblasts secrete chemokine CCL24,
whereas DSCs express receptor CCR3. DSCs and trophoblasts co-culture had an raised level of CCL24 in culture supernatants, and the
expression of CCR3 on DSCs was also obviously improved. Estrogen, progesterone and hCG up-regulated the expression of CCR3 on DSCs
at appropriate concentration. CCL24 increased the proliferation and apoptosis of DSCs, whereas on the whole it promoted the number of
DSCs. Thus, we conclude that by secreting CCL24 trophoblasts could promote the growth of DSCs; pregnancy associated environments such
as DSCs-trophoblasts contact and hormones increased local CCL24/CCR3, which means a beneficial factor for the process of decidualization
in human early pregnancy. (IJCEP1304018).

Keywords: CCL24, CCR3, DSCs, maternal-fetal interface, trophoblasts

Address correspondence to: Dr. Da-Jin Li, Laboratory for Reproductive Immunology, Hospital & Institute of Obstetrics and Gynecology, IBS,
Fudan University Shanghai Medical College, Shanghai 200011, China. Phone: +86 21 63457331; Fax: +86 21 63457331; E-mail: djli@shmu.
edu.cn