Leptin and connective tissue growth factor in advanced glycation end-product-induced effects in NRK-49F cells.

Abstract:

:Previously, we showed that Janus kinase 2 (JAK2) is important in advanced glycation end-product (AGE)-induced effects in renal interstitial (NRK-49F) fibroblasts. Leptin is a JAK2-activating cytokine via the long form leptin receptor (Ob-Rb). Leptin and connective tissue growth factor (CTGF) may be involved in renal fibrosis. However, the relationship between leptin and CTGF in terms of AGE-induced effects remains unknown. Thus, the effects of AGE (150 microg/ml) and leptin on mitogenesis, CTGF and collagen expression in NRK-49F cells were determined. We found that leptin and AGE increased mitogenesis and type I collagen protein expression at 3 and 7 days, respectively. AGE increased leptin mRNA and protein expression at 2-3 days. AGE increased CTGF mRNA and protein expression at 3-5 days. AG-490 (JAK2 inhibitor) abrogated AGE-induced leptin mRNA and protein expression at 2-3 days. AG-490 and Ob-Rb anti-sense oligodeoxynucleotides (ODN) abrogated AGE-induced CTGF mRNA and protein expression at 3-5 days. AG-490 and CTGF anti-sense ODN abrogated AGE-induced mitogenesis and collagen protein expression at 7 days. Additionally, leptin dose (0.2-1 microg/ml) and time (1-2 days)-dependently increased CTGF protein expression. AG-490 abrogated leptin (1 microg/ml)-induced CTGF protein expression at 2 days. AG-490 and CTGF anti-sense ODN abrogated leptin-induced mitogenesis and collagen protein expression at 3 days. We concluded that AGE induced JAK2 to increase leptin while leptin induced JAK2 to increase CTGF-induced mitogenesis and type I collagen protein expression in NRK-49F cells. Additionally, AGE-induced mitogenesis and type I collagen protein expression were dependent on leptin-induced CTGF.

journal_name

J Cell Biochem

authors

Lee CI,Guh JY,Chen HC,Lin KH,Yang YL,Hung WC,Lai YH,Chuang LY

doi

10.1002/jcb.20222

subject

Has Abstract

pub_date

2004-11-15 00:00:00

pages

940-50

issue

5

eissn

0730-2312

issn

1097-4644

journal_volume

93

pub_type

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