Glucose transporter expression is developmentally regulated in in vitro derived bovine preimplantation embryos.
Glucose is readily been taken up and utilized by preimplantation embryos from different species. However, a comprehensive analysis of the glucose transporter expression throughout preimplantation development is still missing. Here, we have investigated the expression of facilitative glucose transporters (Glut1-5 and 8) and sodium-dependent-glucose transporter (SGLT-I) in bovine oocytes and preimplantation embryos up to d16 of development, using RT-PCR and immunohistochemistry. The embryos were produced in vitro by IVM-IVF. Glut1, Glut3, Glut8, and SGLT-I were expressed in all stages studied. Glut4 transcripts were first detected at the blastocyst stage. Glut2 expression was restricted to the period of blastocyst elongation at d14 and d16. Transcription of the fructose transporter Glut5 started at the 8-/16-cell stage. Our results show a distinct expression pattern for glucose transporters during bovine embryo development in vitro indicating specialized functions for these isoforms at different developmental stages in bovine embryos. Mol. Reprod. Dev. 60:370-376,
Augustin
R
R
Department of Anatomy and Cell Biology, Martin Luther University Faculty of Medicine, Grosse Steinstrasse 52, D-06097 Halle (Saale), Germany. robert.augustin@student.uni-halle.de
Pocar
P
P
Navarrete-Santos
A
A
Wrenzycki
C
C
Gandolfi
F
F
Niemann
H
H
Fischer
B
B
D000818:Animals; D001755:Blastocyst / Q000378:metabolism*; D002417:Cattle; D002970:Cleavage Stage, Ovum / Q000378:metabolism; D005314:Embryonic and Fetal Development; D005260:Female; D018507:Gene Expression Regulation, Developmental; D007150:Immunohistochemistry; D066298:In Vitro Techniques; D008562:Membrane Glycoproteins / Q000235:genetics; D009004:Monosaccharide Transport Proteins / Q000235:genetics* / Q000378:metabolism*; D009028:Morula / Q000378:metabolism; D009865:Oocytes / Q000378:metabolism; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D051269:Sodium-Glucose Transporter 1
D008562:Membrane Glycoproteins; D009004:Monosaccharide Transport Proteins; D012333:RNA, Messenger; D051269:Sodium-Glucose Transporter 1