Antigen-presenting cells in human endometrium during the menstrual cycle compared to early pregnancy.
OBJECTIVE
Human endometrium and early pregnancy decidua harbor a considerable and diverse population of antigen-presenting cells (APC). Changes in the number and distribution of macrophages and dendritic cells (DC) could point to a possible role of these immunocompetent cells in implantation and success of early pregnancy.


METHODS
Uterine tissue was obtained from 22 women undergoing hysterectomy for bleeding disorders or dysmenorrhea and from 11 women undergoing legal abortion. Tissue was investigated with antibodies against CD14, CD68, CD83, DC-SIGN, Ki-67, and human leukocyte antigen (HLA)-DR using single and double immunohistochemical staining techniques.


RESULTS
The number of CD14(+) cells was stable during all phases of the menstrual cycle and early pregnancy. In comparison to nonpregnant endometrium, DC-SIGN(+) cells showed a higher proliferation rate and were found associated in clusters with CD56(+) natural killer (NK) cells in early pregnancy. In the late secretory phase of the menstrual cycle, numbers of CD83(+) (P <.01) cells were significantly higher than in other endometrial phases and early pregnancy. HLA-DR(+) expression was significantly increased in early pregnancy but remained unchanged throughout the menstrual cycle.


CONCLUSIONS
The presence of DC-SIGN(+) cells during the menstrual cycle and their proliferation in early pregnancy suggests an important role of these cells with regard to the balance between defense against pathogens and tolerance of the fetal allograft. Whether the increase of CD83(+) mature DC and CD68(+) macrophages in the late secretory phase is caused by hormonal stimuli and/or is due to changes of the cytokine/chemokine micromilieu remains to be investigated.
Rieger
L
L
Department of Obstetrics and Gynecology, University of Würzburg, Würzburg, Germany.
Honig
A
A
Sütterlin
M
M
Kapp
M
M
Dietl
J
J
Ruck
P
P
Kämmerer
U
U
D000028:Abortion, Induced; D000938:Antigen-Presenting Cells / Q000166:cytology* / Q000276:immunology; D015703:Antigens, CD / Q000032:analysis; D015214:Antigens, Differentiation, Myelomonocytic / Q000032:analysis; D015815:Cell Adhesion Molecules / Q000032:analysis; D002452:Cell Count; D002455:Cell Division; D004717:Endometrium / Q000166:cytology*; D005260:Female; D006684:HLA-DR Antigens / Q000032:analysis; D006801:Humans; D007044:Hysterectomy; D007136:Immunoglobulins / Q000032:analysis; D007150:Immunohistochemistry; D016130:Immunophenotyping; D019394:Ki-67 Antigen / Q000032:analysis; D037181:Lectins, C-Type / Q000032:analysis; D018950:Lipopolysaccharide Receptors / Q000032:analysis; D008562:Membrane Glycoproteins / Q000032:analysis; D008597:Menstrual Cycle; D011247:Pregnancy; D011956:Receptors, Cell Surface / Q000032:analysis; D000097802:CD83 Antigen; D000099215:DC-Specific ICAM-3 Grabbing Nonintegrin; D000097382:CD68 Molecule
D015703:Antigens, CD; D015214:Antigens, Differentiation, Myelomonocytic; D015815:Cell Adhesion Molecules; D006684:HLA-DR Antigens; D007136:Immunoglobulins; D019394:Ki-67 Antigen; D037181:Lectins, C-Type; D018950:Lipopolysaccharide Receptors; D008562:Membrane Glycoproteins; D011956:Receptors, Cell Surface; D000097802:CD83 Antigen; D000099215:DC-Specific ICAM-3 Grabbing Nonintegrin; C067980:CD68 antigen, human; D000097382:CD68 Molecule