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FEBS Lett ; 532(1-2): 216-20, 2002 Dec 04.
Artigo em Inglês | MEDLINE | ID: mdl-12459493

RESUMO

Neovascularization, an essential step for tumor progression and metastasis development, can be modulated by the presence of macrophages (Mps) in the tumor microenvironment. The ability of Mps to regulate the angiogenicity of the LMM3 tumor cell line was studied. Peritoneal Mps from LMM3 tumor-bearing mice (TMps) potentiate in vivo LMM3 angiogenicity. These results were confirmed by CD31 immunoblotting assays. The activity of TMps depended on nitric oxide synthase (NOS) and arginase (A) activity. By immunoblotting we evidenced that AI and AII isoforms were up-regulated in TMps while the inducible and neuronal NOS isoforms were highly expressed in normal Mps. TMps might positively modulate tumor growth by stimulating angiogenic cascade mainly through polyamine synthesis.


Assuntos
Arginina/metabolismo , Macrófagos Peritoneais/metabolismo , Neoplasias Experimentais/irrigação sanguínea , Neoplasias Experimentais/metabolismo , Neovascularização Patológica , Animais , Arginase/fisiologia , Feminino , Isoenzimas/metabolismo , Macrófagos Peritoneais/enzimologia , Camundongos , Camundongos Endogâmicos BALB C , Neoplasias Experimentais/enzimologia , Óxido Nítrico Sintase/fisiologia , Células Tumorais Cultivadas
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