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Gastroenterology ; 142(4): 897-906, 2012 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-22178588

RESUMO

BACKGROUND & AIMS: Hepatocyte growth factor/scatter factor (HGF/SF) stimulates hepatocyte DNA synthesis and protects against apoptosis; in vivo it promotes liver regeneration and reduces fibrosis. However, its therapeutic value is limited by its complex domain structure, high cost of production, instability, and poor tissue penetration due to sequestration by heparin sulfate proteoglycans (HSPGs). METHODS: Using protein engineering techniques, we created a full-length form of HGF/SF (called HP21) and a form of the small, naturally occurring HGF/SF fragment, NK1 (called 1K1), which have reduced affinity for HSPG. We characterized the stability and proliferative and anti-apoptotic effects of these variants in primary human hepatocytes and in rodents. RESULTS: Analytical ultracentrifugation showed that 1K1 and NK1 were more stable than the native, full-length protein. All 4 forms of HGF/SF induced similar levels of DNA synthesis in human hepatocytes; 1K1 and NK1 required heparin, an HSPG analogue, for full agonistic activity. All the proteins reduced levels of Fas ligand-mediated apoptosis, reducing the activity of caspase-3/7 and cleavage of poly(adenosine diphosphate-ribose) polymerase. 1K1 was more active than NK1 in rodents; in healthy mice, 1K1 significantly increased hepatocyte DNA synthesis, and in mice receiving carbon tetrachloride, it reduced fibrosis. In rats, after 70% partial hepatectomy, daily administration of 1K1 for 5 days significantly increased liver mass and the bromodeoxyuridine labeling index compared with mice given NK1. CONCLUSIONS: 1K1, an engineered form of the small, naturally occurring HGF/SF fragment NK1, has reduced affinity for HSPG and exerts proliferative and antiapoptotic effects in cultured hepatocytes. In rodents, 1K1 has antifibrotic effects and promotes liver regeneration. The protein has better stability and is easier to produce than HGF/SF and might be developed as a therapeutic for acute and chronic liver disease.


Assuntos
Proliferação de Células/efeitos dos fármacos , Fator de Crescimento de Hepatócito/farmacologia , Hepatócitos/efeitos dos fármacos , Cirrose Hepática/prevenção & controle , Regeneração Hepática/efeitos dos fármacos , Fígado/efeitos dos fármacos , Fragmentos de Peptídeos/farmacologia , Engenharia de Proteínas , Animais , Apoptose , Sítios de Ligação , Tetracloreto de Carbono , Caspase 3/metabolismo , Caspase 7/metabolismo , Células Cultivadas , Replicação do DNA , Modelos Animais de Doenças , Relação Dose-Resposta a Droga , Proteína Ligante Fas/metabolismo , Proteoglicanas de Heparan Sulfato/metabolismo , Hepatectomia , Fator de Crescimento de Hepatócito/química , Fator de Crescimento de Hepatócito/genética , Fator de Crescimento de Hepatócito/metabolismo , Hepatócitos/metabolismo , Hepatócitos/patologia , Humanos , Fígado/metabolismo , Fígado/patologia , Fígado/cirurgia , Cirrose Hepática/induzido quimicamente , Cirrose Hepática/metabolismo , Cirrose Hepática/patologia , Masculino , Camundongos , Camundongos Endogâmicos BALB C , Modelos Moleculares , Fragmentos de Peptídeos/química , Fragmentos de Peptídeos/genética , Fragmentos de Peptídeos/metabolismo , Poli(ADP-Ribose) Polimerases/metabolismo , Conformação Proteica , Estabilidade Proteica , Ratos , Ratos Sprague-Dawley , Proteínas Recombinantes/metabolismo , Fatores de Tempo , Ultracentrifugação
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