Nomilin inhibits metastasis via induction of apoptosis and regulates the activation of transcription factors and the cytokine profile in B16F-10 cells.

Abstract

Nomilin is a triterpenoid present in common edible citrus fruits with putative anticancer properties. In this study, the authors investigated the antimetastatic potential of nomilin and its possible mechanism of action. Metastasis was induced in C57BL/6 mice through the lateral tail vein using highly metastatic B16F-10 melanoma cells. Administration of nomilin inhibited tumor nodule formation in the lungs (68%) and markedly increased the survival rate of the metastatic tumor-bearing animals. These results correlated with the biochemical parameters and histopathological analysis. Nomilin showed an inhibition of tumor cell invasion and activation of matrix metalloproteinases. Treatment with nomilin induced apoptotic response, characterized by an increase in the sub-G1 fraction of cells with chromatin condensation and membrane blebbing, a typical ladder of DNA fragmentation, and detection of apoptotic cells by TUNEL assay. Nomilin treatment also exhibited a downregulated Bcl-2 and cyclin-D1 expression and upregulated p53, Bax, caspase-9, caspase-3, p21, and p27 gene expression in B16F-10 cells. Proinflammatory cytokine production and gene expression were found to be downregulated in nomilin-treated cells. The study also reveals that nomilin could inhibit the activation and nuclear translocation of antiapoptotic transcription factors such as nuclear factor (NF)-κB, CREB, and ATF-2 in B16F-10 cells.

• Authors: Poyil Pratheeshkumar, Tharakan J Raphael, Girija Kuttan
• Journal: Integrative cancer therapies (Integr Cancer Ther) Vol. 11 Issue 1 Pg. 48-60 (Mar 2012) ISSN: 1552-695X [Electronic] United States
• PMID: 21665879 (Publication Type: Journal Article)

Chemical References

• Activating Transcription Factor 2
• Antineoplastic Agents, Phytogenic
• Atf2 protein, mouse
• Benzoxepins
• Creb1 protein, mouse
• Cyclic AMP Response Element-Binding Protein
• Cyclin-Dependent Kinase Inhibitor p21
• Limonins
• Matrix Metalloproteinase Inhibitors
• NF-kappa B
• Plant Extracts
• Proto-Oncogene Proteins c-bcl-2
• Transcription Factors
• Tumor Suppressor Protein p53
• bcl-2-Associated X Protein
• Cyclin D1
• Cyclin-Dependent Kinase Inhibitor p27
• nomilin
• Caspase 3
• Caspase 9
• Matrix Metalloproteinases

Topics

• Activating Transcription Factor 2 (genetics, metabolism)
• Animals
• Antineoplastic Agents, Phytogenic (pharmacology)
• Apoptosis (drug effects, genetics)
• Benzoxepins (pharmacology)
• Caspase 3 (genetics, metabolism)
• Caspase 9 (genetics, metabolism)
• Cell Cycle (drug effects, genetics)
• Cell Line, Tumor
• Cyclic AMP Response Element-Binding Protein (genetics, metabolism)
• Cyclin D1 (genetics, metabolism)
• Cyclin-Dependent Kinase Inhibitor p21 (genetics, metabolism)
• Cyclin-Dependent Kinase Inhibitor p27 (genetics, metabolism)
• DNA Fragmentation (drug effects)
• Down-Regulation (drug effects, genetics)
• Limonins (pharmacology)
• Lung Neoplasms (drug therapy, metabolism, secondary)
• Male
• Matrix Metalloproteinase Inhibitors
• Matrix Metalloproteinases (genetics, metabolism)
• Melanoma, Experimental (drug therapy, genetics, metabolism, pathology)
• Mice
• Mice, Inbred C57BL
• NF-kappa B (genetics, metabolism)
• Neoplasm Invasiveness (genetics, pathology, prevention & control)
• Neoplasm Metastasis
• Plant Extracts (pharmacology)
• Proto-Oncogene Proteins c-bcl-2 (genetics, metabolism)
• Survival Rate
• Transcription Factors (genetics, metabolism)
• Tumor Suppressor Protein p53 (genetics, metabolism)
• Up-Regulation (drug effects, genetics)
• bcl-2-Associated X Protein (genetics, metabolism)