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Titolo:
Leptin stimulates proliferation and TGF-beta expression in renal glomerular endothelial cells: Potential role in glomerulosclerosis
Autore:
Wolf, G; Hamann, A; Han, DC; Helmchen, U; Thaiss, F; Ziyadeh, FN; Stahl, RAK;
Indirizzi:
Univ Hamburg, Dept Med, Div Nephrol & Osteol, Diabet Res Grp, Hamburg, Germany Univ Hamburg Hamburg Germany & Osteol, Diabet Res Grp, Hamburg, Germany Univ Hamburg, Dept Pathol, Hamburg, Germany Univ Hamburg Hamburg Germany niv Hamburg, Dept Pathol, Hamburg, Germany Univ Penn, Med Ctr, Renal Electrolyte & Hypertens Div, Philadelphia, PA 19104 USA Univ Penn Philadelphia PA USA 19104 rtens Div, Philadelphia, PA 19104 USA
Titolo Testata:
KIDNEY INTERNATIONAL
fascicolo: 3, volume: 56, anno: 1999,
pagine: 860 - 872
SICI:
0085-2538(199909)56:3<860:LSPATE>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
MASSIVE OBESITY; OB-R; SIGNAL-TRANSDUCTION; ANGIOTENSIN-II; PLASMA LEPTIN; RECEPTOR; RAT; GENE; KIDNEY; DISEASE;
Keywords:
cell proliferation; transforming growth factor beta; sclerosis; fibrogenesis; recombinant leptin;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Life Sciences
Citazioni:
47
Recensione:
Indirizzi per estratti:
Indirizzo: Wolf, G Univ Hamburg, Hosp Eppendorf, Dept Med, Div Nephrol & Osteol, Martinistr 52,Pavil 61, D-20246 Hamburg, Germany Univ Hamburg Martinistr 52,Pavil 61 Hamburg Germany D-20246 rmany
Citazione:
G. Wolf et al., "Leptin stimulates proliferation and TGF-beta expression in renal glomerular endothelial cells: Potential role in glomerulosclerosis", KIDNEY INT, 56(3), 1999, pp. 860-872

Abstract

Background. Leptin inhibits food intake and increases energy expenditure. Although the kidney expresses abundant transcripts of the short form of theleptin receptor (Ob-Ra), a role for this hormone in renal function remainsunclear. Because individuals with massive obesity who may exhibit increased leptin serum concentrations develop renal glomerulosclerosis, we studied whether leptin can influence renal growth and profibrogenic processes. Methods. The effects of recombinant leptin on proliferation and synthesis of transforming growth factor-beta 1 (TGF-beta 1) was investigated in cultured glomerular endothelial cells of the rat (GERs) and syngeneic mesangial cells. Furthermore, leptin receptor expression and potential signal transduction pathways were evaluated in GERs. In addition, leptin was also infusedfor different time periods (72 hr and 3 weeks) into naive rats. Results. Recombinant mouse leptin induced proliferation of GERs, but not of syngeneic mesangial cells. Coincubation with angiotensin II and leptin exerts additive proliferative effects in GERs. An antileptin-receptor antibody totally abolished this proliferation but did not influence serum-induced proliferation. GER expressed high affinity receptors of the Ob-Ra type (K-d, 4 nM; B-max, 9700 receptors/cell). Leptin also stimulated phosphorylationof STAT1 alpha, and kinase inhibitors attenuated proliferation, suggestinga pivotal role of phosphorylation in this process. Incubation of GERs withleptin also induced mRNA expression of TGF-beta 1 and enhanced secretion of this profibrogenic cytokine. Short-term leptin infusion (72 hr) into naive rats induced a significant proliferation, mainly restricted to glomerularendothelial cells, and enhanced glomerular TGF-beta 1 mRNA levels. In ratscontinuously infused for three weeks with leptin, glomerular TGF-beta 1 expression was still enhanced, and an additional increase in glomerular collagen type IV mRNA and protein expression was detected. These animals revealed an increase in proteinuria compared with control-infused rats. Conclusion. Our findings are the first in vitro and in vivo demonstration that leptin is a renal growth and profibrogenic factor. These results may be an important contribution to our understanding of how leptin can contribute to renal damage, characterized by endocapillary proliferation and subsequent development of glomerulosclerosis, in pathophysiological situations with high circulating levels such as in diabetics or obese individuals. Although the effects of leptin itself are moderate, growth-promoting and profibrogenic effects may be enhanced in concert with other factors such as angiotensin II.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/07/20 alle ore 22:21:35