Murine abortion is associated with enhanced interleukin-6 levels at the feto-maternal interface.
CBA/JXDBA/2J murine abortion is known to be associated with increased local and peripheral Th1-cytokines levels. The role of the pro-inflammatory interleukin-6 (IL-6) in murine abortion remains unclear. In humans, IL-6 was reported to be elevated at the onset of spontaneous abortion. The aim of our study was to evaluate the levels of IL-6 during murine pregnancy in (1) the normal murine pregnancy combination CBA/JXBALB/c and in (2) the CBA/JXDBA/2J abortion prone mating combination. We measured IL-6 serum levels by ELISA and local (placental and decidual) IL-6 levels by flow cytometry and immunohistochemistry. The expression of the IL-6 receptor gp80 was further analyzed. We additionally evaluated the number of mast cells and macrophages at the feto-maternal interface as a putative IL-6 source in reproductive tissues. IL-6 and gp80 were expressed in decidual cells as well as in different trophoblast types. Flow cytometry analysis showed increased numbers of IL-6+ cells in abortion placentas and deciduas compared to control pregnant mice. We observed an elevated number of mast cells and macrophages at the feto-maternal interface from abortion mice in comparison to control mice. Interestingly, we found very high numbers of mast cells, macrophages and IL-6+ cells in resorption tissue compared to control tissues. Flow cytometry studies confirmed that macrophages are being an important source of IL-6 at the feto-maternal interface. The mRNA IL-6 levels were also enhanced in placenta and decidua from mice with high abortion rate compared to normal pregnant mice, as analyzed by RT-PCR. Our results suggest that IL-6 produced not only by immunocompetent cells such as macrophages and mast cells, but also by trophoblasts and decidua cells, is directly involved in the pathology of abortion.
IDEHU-Instituto de Estudios de Inmunidad Humoral, CONICET, Universidad de Buenos Aires, Argentina. ana.zenclussen@charite.de
Ana Claudia
AC
Zenclussen
Sandra
S
Blois
Rita
R
Stumpo
Sofía
S
Olmos
Karina
K
Arias
Ileana
I
Malan Borel
María Estela
ME
Roux
Ricardo Aníbal
RA
Margni
D000034:Abortion, Veterinary / Q000235:genetics / Q000378:metabolism* / Q000473:pathology; D000818:Animals; D039481:CD11b Antigen / Q000032:analysis; D002452:Cell Count; D003433:Crosses, Genetic; D003656:Decidua / Q000737:chemistry / Q000378:metabolism* / Q000473:pathology; D005260:Female; D005327:Fetal Resorption / Q000235:genetics / Q000378:metabolism / Q000473:pathology; D005434:Flow Cytometry; D015870:Gene Expression; D007150:Immunohistochemistry; D015850:Interleukin-6 / Q000097:blood / Q000235:genetics / Q000378:metabolism*; D008264:Macrophages / Q000166:cytology; D008297:Male; D008407:Mast Cells / Q000166:cytology; D051379:Mice; D008807:Mice, Inbred BALB C; D008808:Mice, Inbred CBA; D008811:Mice, Inbred DBA; D009000:Monocytes / Q000378:metabolism; D010920:Placenta / Q000737:chemistry / Q000378:metabolism* / Q000473:pathology; D011247:Pregnancy; D019947:Receptors, Interleukin-6 / Q000378:metabolism; D014327:Trophoblasts / Q000737:chemistry
D039481:CD11b Antigen; D015850:Interleukin-6; D019947:Receptors, Interleukin-6