RESUMO
As a result of strong experimental data supporting effectiveness and safety, herb-based immunomodulators are paving way as alternative sources of potent adjuvants for vaccines. In this study, the immunostimulatory and adjuvant properties of AcF1, a flavonoids-rich fraction of Alchornea cordifolia extract, was evaluated. In vitro, AcF1 was shown to activate total splenocytes, CD4+ T cells, and B cells, inducing remarkable increases in CD69 expression, profound proliferation, and increased IL-4 and IFN-gamma expression by the naïve splenic cells in a concentration-dependent manner. Lympho-activation and proliferation induced by AcF1 was partially inhibited by U0126, a selective mitogen activated protein kinase kinase (MKK) inhibitor. Additionally, AcF1 was shown to induce structural and functional maturation of bone marrow-derived dendritic cells (BM-DCs) and their specific-antigen presentation functions. Used as an adjuvant in a homologous prime-boost OVA immunisation in C57BL/6 mice, AcF1 significantly (P<0.05) increased the level of OVA-specific antibody titres in the sera of immunised mice, compared to the control group immunised with OVA alone. The results of this study show AcF1 as a potent immunostimulant and a potential adjuvant for further study in combination with other vaccine antigens.
Assuntos
Adjuvantes Imunológicos , Euphorbiaceae , Ativação Linfocitária/efeitos dos fármacos , Extratos Vegetais , Adjuvantes Imunológicos/isolamento & purificação , Adjuvantes Imunológicos/farmacologia , Animais , Apresentação de Antígeno/efeitos dos fármacos , Antígenos CD/biossíntese , Antígenos CD/imunologia , Antígenos de Diferenciação de Linfócitos T/biossíntese , Antígenos de Diferenciação de Linfócitos T/imunologia , Linfócitos B/imunologia , Linfócitos T CD4-Positivos/imunologia , Linhagem Celular , Células Dendríticas/imunologia , Células Dendríticas/metabolismo , Euphorbiaceae/química , Euphorbiaceae/imunologia , Feminino , Flavonoides/imunologia , Flavonoides/farmacologia , Interferon gama/biossíntese , Interleucina-4/biossíntese , Lectinas Tipo C/biossíntese , Lectinas Tipo C/imunologia , Ativação Linfocitária/imunologia , Camundongos , Camundongos Endogâmicos C57BL , Camundongos Transgênicos , Quinases de Proteína Quinase Ativadas por Mitógeno/metabolismo , Ovalbumina/imunologia , Extratos Vegetais/imunologia , Extratos Vegetais/farmacologia , Baço/imunologia , Baço/metabolismoRESUMO
The population of epithelial cells in the small intestine includes precursor cells of hemopoiesis possessing the ability to form splenic colonies on day 8. Intestinal epithelial cells stimulates proliferative and colony-forming activity of hemopoietic stem cells by producing granulocyte-macrophage colony-stimulating factor.