Immunobiological features of the galactoside lectin L-Lc isolated from the Argentine mistletoe Ligaria cuneifolia
| Autor: | E Caldas Lopes, P Cerdá Zolezzi, P Aulicino, Marcelo L. Wagner, S. E. Hajos, Elida Alvarez, T Fernández, Rafael A. Ricco, Alberto A. Gurni |
|---|---|
| Rok vydání: | 2003 |
| Předmět: |
Male
Cell Survival Argentina Apoptosis Loranthaceae In Vitro Techniques Nitric Oxide Mice chemistry.chemical_compound Adjuvants Immunologic Drug Discovery Tumor Cells Cultured Splenocyte Viscum album Animals Cytotoxic T cell RNA Messenger Pharmacology Mice Inbred BALB C biology Plant Extracts Acridine orange Lectin Galactosides Neoplasms Experimental biology.organism_classification Molecular biology Galactoside chemistry Biochemistry Macrophages Peritoneal biology.protein Cytokines Electrophoresis Polyacrylamide Gel Female Plant Lectins Cell Division Neoplasm Transplantation Spleen |
| Zdroj: | Journal of Ethnopharmacology. 85:81-92 |
| ISSN: | 0378-8741 |
| Popis: | Ligaria cuneifolia has been used in Argentine folk medicine and is currently employed as substitute for the European mistletoe (Viscum album) as hypotensor agent. Extracts from V. album are widely used in cancer therapy and the antineoplasic effect is attributed to their cytostatic/cytotoxic and immunomodulatory actions. When studying immunomodulatory effects of L. cuneifolia extracts (Lc extracts), they inhibited proliferation of murine mitogen-activated lymphocytes, leukaemic lymphocytes (LB) and breast tumour cells (MMT). The aim of this work was to isolate and identify lectins from Lc extracts and investigate their immunobiological actions. A galactoside lectin (L-Lc) of 57 kDa was isolated. A polyclonal antiserum obtained against Lc extract recognised both L-Lc and MLI (V. album lectin), suggesting the possibility of shared epitopes. Treatment of LB tumour cells with L-Lc (0.01 and 0.1g/ml) produced up to 40.0 ± 6.9% inhibition of cell growth, which seems partly mediated by apoptosis (apoptosis of L-Lc treated cells 58.4 ± 10.3% versus non-treated cells 38.1 ± 8.8%; P< 0.05), analysed by acridine orange and ethidium bromide staining. Inhibitory effect on ConA stimulated splenocyte growth was non-significant, while a mitogenic effect was observed on normal murine splenocytes and MMT cells. L-Lc in non-cytotoxic concentrations (250 ng/ml) modified mRNA expression of IL-10 but neither that of TGF- nor of IL-2 produced by LB cells. In addition, 43.9 ± 0.5% reduction in NO production by LPS-stimulated murine macrophages was found. Finally, survival rates of LB tumour-bearing mice treated or not with Lc extract or L-Lc failed to show significant differences. © 2002 Elsevier Science Ireland Ltd. All rights reserved. |
| Databáze: | OpenAIRE |
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