IGF expression patterns and regulation in growth plate chondrocytes.
IGF-I and IGF-II are key regulators of growth and metabolism. Still, data about their expression and distribution within the growth plate in different animal models remain contradictory. Inferences drawn from rodent animal models can only be applied to human conditions to a limited extent as the rodent's growth plate never fuses. In this study, we compared the expression of IGF-I and IGF-II in native growth plates of prepubertal piglets and under different cell culture conditions. We detected IGF-I mRNA expression and abundantly expressed IGF-II within the growth plate. IGF-I expression increased during monolayer cell culture while IGF-II expression dramatically decreased. Our studies revealed that these expression patterns remained unaffected by growth hormone stimulation in vitro. The abundant expression of IGF-II in porcine growth plate tissue, both on the mRNA and on the protein level, suggests that IGF-II also has a role in growth regulation at the early postnatal stage.
Schlegel
Werner
W
Medical University of Vienna, Department of Paediatrics and Adolescent Medicine, Vienna, Austria.
Halbauer
Daniel
D
Raimann
Adalbert
A
Albrecht
Christian
C
Scharmer
Daniela
D
Sagmeister
Susanne
S
Helmreich
Magda
M
Häusler
Gabriele
G
Egerbacher
Monika
M
D000818:Animals; D002478:Cells, Cultured; D019902:Chondrocytes / Q000187:drug effects / Q000378:metabolism*; D024121:Collagen Type X / Q000235:genetics / Q000378:metabolism; D005786:Gene Expression Regulation / Q000187:drug effects; D013006:Growth Hormone / Q000494:pharmacology; D006132:Growth Plate / Q000166:cytology*; D006801:Humans; D007150:Immunohistochemistry; D007334:Insulin-Like Growth Factor I / Q000235:genetics* / Q000378:metabolism; D007335:Insulin-Like Growth Factor II / Q000235:genetics* / Q000378:metabolism; D008099:Liver / Q000187:drug effects / Q000378:metabolism; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D034421:Sus scrofa
D024121:Collagen Type X; D012333:RNA, Messenger; D007334:Insulin-Like Growth Factor I; D007335:Insulin-Like Growth Factor II; D013006:Growth Hormone