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Cytotoxic profile of natural and some modified bufadienolides from toadRhinella schneideriparotoid gland secretion

Authors
Journal
Toxicon
0041-0101
Publisher
Elsevier
Publication Date
Volume
56
Issue
3
Identifiers
DOI: 10.1016/j.toxicon.2010.03.021
Keywords
  • Rhinella Schneideri
  • Cytotoxic Profile
  • Bufadienolides
  • 20S
  • 21R-Epoxymarinobufagin
Disciplines
  • Biology
  • Chemistry
  • Pharmacology

Abstract

Abstract Cutaneous secretions of toad species are an important source of bufadienolides, compounds that exhibit interesting structural features and biopharmacological properties. Here we describe the isolation of bufadienolides from the Brazilian toad Rhinella schneideri parotoid glands secretion, including: marinobufagin ( 1), bufalin ( 2), telocinobufagin ( 3), hellebrigenin ( 4), and the atypical 20 S,21 R-epoxymarinobufagin ( 5) besides the widespread β-sitosterol ( 6). Starting from natural bufadienolides four derivatives were prepared: 3 β-acetoxy-marinobufagin ( 7), 3 β-acetoxy-bufalin ( 8), 3 β-acetoxy-telocinobufagin ( 9), and 3 β-acetoxy-20 S,21 R-epoxymarinobufagin ( 10). The cytotoxic evaluation showed that all natural bufadienolides and their derivatives exhibited moderate to strong activity against human HL-60, SF-295, MDA-MB-435, and HCT-8 cancer cell strains without hemolysis of mouse erythrocytes. The acetylated bufadienolides ( 7–9) and the epoxide 10 showed lesser peripheral blood lymphocytes (PBLs) inhibitory activity than their precursors, suggesting that chemical modifications on such compounds can play an important role on the modulation of their cytotoxic profile.

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