Estradiol inhibits chondrogenic differentiation of mesenchymal stem cells via nonclassic signaling.
OBJECTIVE
We undertook this study to examine the effects of estradiol on chondrogenesis of human bone marrow-derived mesenchymal stem cells (MSCs), with consideration of sex-dependent differences in cartilage repair.


METHODS
Bone marrow was obtained from the iliac crest of young men. Density-gradient centrifugation-separated human MSCs proliferated as a monolayer in serum-containing medium. After confluence was achieved, aggregates were created and cultured in a serum-free differentiation medium. We added different concentrations of 17beta-estradiol (E2) with or without the specific estrogen receptor inhibitor ICI 182.780, membrane-impermeable E2-bovine serum albumin (E2-BSA), ICI 182.780 alone, G-1 (an agonist of G protein-coupled receptor 30 [GPR-30]), and G15 (a GPR-30 antagonist). After 21 days, the aggregates were analyzed histologically and immunohistochemically; we quantified synthesized type II collagen, DNA content, sulfated glycosaminoglycan (sGAG) concentrations, and type X collagen and matrix metalloproteinase 13 (MMP-13) expression.


RESULTS
The existence of intracellular and membrane-associated E2 receptors was shown at various stages of chondrogenesis. Smaller aggregates and significantly lower type II collagen and sGAG content were detected after treatment with E2 and E2-BSA in a dose-dependent manner. Furthermore, E2 enhanced type X collagen and MMP-13 expression. Compared with estradiol alone, the coincubation of ICI 182.780 with estradiol enhanced suppression of chondrogenesis. Treatment with specific GPR-30 agonists alone (G-1 and ICI 182.780) resulted in a considerable inhibition of chondrogenesis. In addition, we found an enhancement of hypertrophy by G-1. Furthermore, the specific GPR-30 antagonist G15 reversed the GPR-30-mediated inhibition of chondrogenesis and up-regulation of hypertrophic gene expression.


CONCLUSIONS
The experiments revealed a suppression of chondrogenesis by estradiol via membrane receptors (GPR-30). The study opens new perspectives for influencing chondrogenesis on the basis of classic and nonclassic estradiol signaling.
Jenei-Lanzl
Zsuzsa
Z
University Medical Center Regensburg, 93042 Regensburg, Germany.
Straub
Rainer H
RH
Dienstknecht
Thomas
T
Huber
Marion
M
Hager
Markus
M
Grässel
Susanne
S
Kujat
Richard
R
Angele
Martin K
MK
Nerlich
Michael
M
Angele
Peter
P
D001854:Bone Marrow Cells / Q000166:cytology / Q000187:drug effects; D002356:Cartilage / Q000166:cytology* / Q000187:drug effects; D002454:Cell Differentiation / Q000187:drug effects*; D004958:Estradiol / Q000031:analogs & derivatives / Q000494:pharmacology*; D004965:Estrogen Antagonists / Q000494:pharmacology; D047628:Estrogen Receptor alpha / Q000502:physiology; D047629:Estrogen Receptor beta / Q000502:physiology; D000077267:Fulvestrant; D006801:Humans; D008297:Male; D059630:Mesenchymal Stem Cells / Q000166:cytology* / Q000187:drug effects; D015398:Signal Transduction / Q000187:drug effects / Q000502:physiology*; D055815:Young Adult
D004965:Estrogen Antagonists; D047628:Estrogen Receptor alpha; D047629:Estrogen Receptor beta; D000077267:Fulvestrant; D004958:Estradiol