title: Different intracellular signalling properties induced by human and porcine growth hormone.
abstract: Growth hormone (GH) is reportedly species-specific. Primate growth hormone can trigger non-primate growth hormone receptor (GHR), but primates GHR cannot be activated by non-primate GH. However, it is also unclear that why primate GH and non-primate GH have different biological activities. Thus, we analysed primate growth hormone (human growth hormone (hGH)) or non-primate GH (porcine growth hormone (pGH))-induced intracellular signalling in 3T3-F442A cells and rat hepatocytes in a dose- and time-dependent manner to explore the different biological activities between them. The results revealed that both hGH and pGH can activate Janus kinase 2 (JAK2), Signal transducers and activators of transcription 1, 3 and 5 (STATs 1, 3 and 5) and extracellular signal-regulated kinase 1/2 (ERK1/2). There were no significant differences in JAK2 or ERK1/2 tyrosine phosphorylation after hGH and pGH treatment, but there were different between hGH and pGH in STAT/1/3/5 tyrosine phosphorylation, and JAK2, STAT/1/3/5 tyrosine phosphorylation was time-dependent and dose-dependent, whereas ERK1/2 was not. Both hGH and pGH demonstrated similar kinetics for STATs 1, 3 and 5 phosphorylation, but the pGH-mediated tyrosine phosphorylation was weaker than that mediated by hGH. Our observations indicated that the levels of main signalling proteins phosphorylation triggered by hGH or pGH were not exactly the same, which may explain the different biological activities showed by primate GH and non-primate GH.
authors.affiliation: College of Animal Science and Technology, Jilin Agricultural University, Xincheng Street 2888, Changchun 130118, China.
authors.forename: Pan
authors.initials: P
authors.lastname: Hong
authors.affiliation: College of Animal Science and Technology, Jilin Agricultural University, Xincheng Street 2888, Changchun 130118, China.
authors.forename: Hainan
authors.initials: H
authors.lastname: Lan
authors.affiliation: College of Animal Science and Technology, Jilin Agricultural University, Xincheng Street 2888, Changchun 130118, China.
authors.forename: Yumeng
authors.initials: Y
authors.lastname: Li
authors.affiliation: College of Animal Science and Technology, Jilin Agricultural University, Xincheng Street 2888, Changchun 130118, China.
authors.forename: Zhiling
authors.initials: Z
authors.lastname: Fu
authors.affiliation: College of Animal Science and Technology, Jilin Agricultural University, Xincheng Street 2888, Changchun 130118, China. Electronic address: jilinzhengxin@126.com.
authors.forename: Xin
authors.initials: X
authors.lastname: Zheng
mesh_terms: D000818:Animals; D013006:Growth Hormone / Q000378:metabolism*; D006801:Humans; D051379:Mice; D011817:Rabbits; D051381:Rats; D015398:Signal Transduction; D013552:Swine
chemical_list: D013006:Growth Hormone
keywords: Biological activity; Human growth hormone; Intracellular signalling; Non-primates; Porcine growth hormone; Primates