RESUMO
The aim of this study was to determine the association of dietary folate and cobalamin with plasma levels of Angiopoietins (ANG), vascular endothelial growth factor-C (VEGF-C) and tyrosine kinase receptor-2 (Tie-2) of primary breast cancer patients. Women (n = 177), aged 30 to 75 years diagnosed with breast cancer were recruited from an ongoing case series study. Dietary intake of nutrients was estimated by using a validated food frequency questionnaire. Enzyme-linked immunosorbent assay was applied to measure biomarkers. MCF-7 cell cultures were supplemented with folic acid (0-40 µM) for 24 h to measure cell viability and fold change of expression by the real-time reverse transcriptase-polymerase chain reaction. Structural equation modeling was applied to analyze the structural relationships between the measured variables of nutrients and Angiopoietins. Dietary intake of folate and cobalamin showed a significant inverse correlation with plasma ANG-1 and ANG-2 (P < 0.05), particularly in subjects with estrogen-receptor positive tumors or low plasma VEGF-C. Plasma folate was positively associated with the ratio of ANG-1/ANG-2 (P < 0.05). Residual intake levels of total cobalamin were inversely associated with plasma ANG-1 when plasma stratum of VEGF-C was high (P < 0.05). Structural equation modeling identified a significant inverse contribution of folate profiles on the latent variable of Angiopoietins (coefficient ß = -0.99, P < 0.05). Folic acid treatment resulted in dose-dependent down-regulations on ANGPT1 and ANGPT1/ANGPT2 ratio but VEGF and ANGPT2/VEGF were upregulated at folic acid >20 µM. Studying the contributing role of dietary folate to pro-angiogenic biomarkers in breast cancer patients can infer the preventive role of folate in the ANGs/VEGF-C-dependent cascade of tumor metastasis. By contrast, high concentrations of folic acid in vitro supported VEGF-C-dependent ANGPT2 overexpression might potentiate micro-lymphatic vessel development to support malignant cell dissemination.
Assuntos
Angiopoietina-1/sangue , Angiopoietina-2/sangue , Neoplasias da Mama/metabolismo , Carcinoma Ductal/metabolismo , Ácido Fólico , Receptor TIE-2/sangue , Fator C de Crescimento do Endotélio Vascular/sangue , Vitamina B 12 , Adulto , Idoso , Biomarcadores Tumorais/sangue , Dieta , Feminino , Ácido Fólico/sangue , Ácido Fólico/farmacologia , Humanos , Células MCF-7 , Pessoa de Meia-Idade , Vitamina B 12/sangue , Vitamina B 12/farmacologiaRESUMO
The antiangiogenic effect of Lygodium flexuosum extract was evaluated in Wistar rats intoxicated with N-nitrosodiethylamine (NDEA) in preventive and curative models. In preventive groups, NDEA was administered for 20 weeks. Daily doses of L. flexuosumn-hexane extract (200mg/kg) started 1 week before the onset of NDEA intoxication and continued for 20 weeks. In curative animals, NDEA was administered for 20 weeks followed by treatment with the n-hexane extract of L. flexuosum for 28 days. Rats intoxicated with NDEA had elevated levels of serum gamma-GT, AST, ALT, LDH levels and hepatic MDA and decreased levels of hepatic GSH. When treated with L. flexuosum extract had normal levels of gamma-GT, AST, ALT, LDH levels, hepatic MDA and GSH. NDEA administered rat liver showed an overexpressed levels of angiopoietins 1 (Ang-1) and 2 (Ang-2) and its receptor Tie-2 mRNA. L. flexuosum extract treatment significantly (pAssuntos
Inibidores da Angiogênese/farmacologia
, Gleiquênias/química
, Neoplasias Hepáticas Experimentais/induzido quimicamente
, Microssomos Hepáticos/efeitos dos fármacos
, Extratos Vegetais/farmacologia
, 3,4-Metilenodioxianfetamina/metabolismo
, Alanina Transaminase/sangue
, Angiopoietina-1/sangue
, Angiopoietina-2/sangue
, Animais
, Aspartato Aminotransferases/sangue
, Dietilnitrosamina
, Glutationa/sangue
, L-Lactato Desidrogenase/sangue
, Microssomos Hepáticos/metabolismo
, Microssomos Hepáticos/patologia
, RNA Mensageiro/sangue
, Ratos
, Ratos Wistar
, Receptor TIE-2/sangue
, Fatores de Tempo
, gama-Glutamiltransferase/sangue