Regulation of cyclooxygenase activity in cultured endometrial stromal cells by granulocyte-macrophage colony-stimulating factor.
OBJECTIVE
To assess the ability of granulocyte-macrophage colony-stimulating factor (GM-CSF) to regulate cyclooxygenase (COX) enzyme activity and prostaglandins (PGs) synthesis, specifically PGE2 production in stromal cells, neither of which have been addressed in the literature.


METHODS
Prospective study.


METHODS
Department of obstetrics and gynecology at a university hospital.


METHODS
Human luteal phase endometrium was obtained from surgical specimens (n = 6) for clinical indications.


METHODS
Confluent stromal cells were stimulated with GM-CSF.


METHODS
Expression of COX mRNA, COX enzyme activity, and PGE2 level in cultured stromal cells.


RESULTS
Confluent stromal cell cultures treated with P and E2 for 9 days were stimulated with GM-CSF. After treatment of 12 hours, low-dose GM-CSF (0.001-0.1 ng/mL) increased COX-2 mRNA levels in stromal cell, whereas high dose GM-CSF (1-100 ng/mL) decreased COX-1 and COX-2 mRNA levels. After treatment of 48 hours, low concentrations of GM-CSF (0.001-0.1 ng/mL) increased total COX and COX-2 enzyme activity, whereas high concentrations of GM-CSF (1-100 ng/mL) inhibited COX and COX-2 activity; The PGE2 levels decreased by 31% to 393.3 pg/mL (P < .05) with concentrations of GM-CSF increasing from 1 ng/mL to 100 ng/mL.


CONCLUSIONS
There appeared to be a biphasic pattern of COX-2 enzyme response to GM-CSF with low concentrations increasing activity and high concentrations inhibiting activity. It is possible that GM-CSF may provide critical regulation of PG production in the preimplantation period.
Wang
Hongbo
H
Huntington Reproductive Center, Westlake Village, California 91361, USA. whbdf@yahoo.com
Wen
Yan
Y
Polan
Mary Lake
ML
Boostanfar
Robert
R
Feinman
Michael
M
Behr
Barry
B
D002478:Cells, Cultured; D051545:Cyclooxygenase 1 / Q000378:metabolism*; D051546:Cyclooxygenase 2 / Q000378:metabolism*; D015232:Dinoprostone / Q000378:metabolism*; D004305:Dose-Response Relationship, Drug; D004717:Endometrium / Q000187:drug effects / Q000378:metabolism*; D004789:Enzyme Activation / Q000187:drug effects; D005260:Female; D016178:Granulocyte-Macrophage Colony-Stimulating Factor / Q000008:administration & dosage*; D006801:Humans; D017154:Stromal Cells / Q000187:drug effects / Q000201:enzymology*
D016178:Granulocyte-Macrophage Colony-Stimulating Factor; D051545:Cyclooxygenase 1; D051546:Cyclooxygenase 2; D015232:Dinoprostone