Oxygen governs Galβ1-3GalNAc epitope in human placenta.
It is becoming increasingly apparent that the dynamics of glycans reflect the physiological state of cells involved in several cell functions including growth, response to signal molecules, migration, as well as adhesion to, interaction with, and recognition of other cells. The presence of glycoconjugates in human placenta suggests their major role in maternal-fetal exchanges, intercellular adhesion, cellular metabolism, and villous vessel branching. Although several studies have described glycoconjugate distribution in the human placenta descriptions of their physiological function and control mechanisms during placental development are lacking. In this study we investigated the developmental distribution and regulation of placental core 1 O- and N-glycans focusing on early and late first trimester human pregnancy. To define the control mechanisms of the oligosaccharide chains during early placentation process, chorionic villous explants and human trophoblast cell lines were exposed to various oxygen levels. We found that oxygen tension regulates changes in core-1 O-glycan (the disaccharide Galβ1-3GalNAc) epitope expression levels. Moreover, by double affinity chromatography and subsequent analysis with mass spectrometry, we identified in the heat shock protein 90-α (HSP90α) a good candidate as carrier of the Galβ1-3GalNAc epitope at low oxygen tension. Our results support a fundamental role of oxygen tension in modulating glycosylation of proteins during placental development.
Department of Life Sciences, University of Siena, Siena, Italy; and.
Leonardo
L
Ermini
Jayonta
J
Bhattacharjee
Antonella
A
Spagnoletti
Nicoletta
N
Bechi
Silvia
S
Aldi
Cristina
C
Ferretti
Laura
L
Bianchi
Luca
L
Bini
Floriana
F
Rosati
Luana
L
Paulesu
Francesca
F
Ietta
D002461:Cell Line, Transformed; D000939:Epitopes / Q000378:metabolism*; D005260:Female; D018841:HSP90 Heat-Shock Proteins / Q000378:metabolism*; D006801:Humans; D009924:Organ Culture Techniques; D010100:Oxygen / Q000494:pharmacology / Q000502:physiology*; D010920:Placenta / Q000187:drug effects / Q000378:metabolism*; D011247:Pregnancy; D012799:Sialyltransferases / Q000378:metabolism*; D000094663:beta-Galactoside alpha-2,3-Sialyltransferase
D000939:Epitopes; D018841:HSP90 Heat-Shock Proteins; C533585:HSP90AA2P protein, human; D012799:Sialyltransferases; D010100:Oxygen; D000094663:beta-Galactoside alpha-2,3-Sialyltransferase; C000722087:ST3GAL1 protein, human
O-glycan; heat shock proteins; oxygen; placenta development