Toxic activities of Brazilian centipede venoms
2008
Abstract
Centipedeshave a
venomgland connected to a pair of
forceps, which are used to arrest preys. Human victims bitten by
centipedesusually manifest burning pain, paresthesia and edema, which may develop into superficial necrosis. The aim of this work was to characterize and compare toxic activities found in
venomsof three species of Brazilian
centipedes— Otostigmus pradoi , Cryptops iheringi and
Scolopendra viridicornis. By SDS–PAGE (4–20%), important differences were noticed among
venoms(between 7 and 205 kDa). Few bands showed feeble caseinolytic, fibrinogenolytic and gelatinolytic activities by
zymography, but strong
hyaluronidaseactivity was observed in S. viridicornis and O. pradoi
venoms. In addition, such activities could be inhibited by o -phenanthroline, indicating that these enzymes are metalloproteinases. All
venomsinduced nociception, edema and myotoxicity in mice, but only S. viridicornis induced mild hemorrhagic activity. No coagulant activity was detected in
centipede
venoms. Low phospholipase A 2 activity was observed exclusively in S. viridicornis and O. pradoi
venoms, but these
venomshad intense direct hemolytic activity on human erythrocytes. Cross-reactivity among
venomswas observed using species-specific sera raised in rabbits. Differences were noticed among
centipede
venoms, but S. viridicornis is indeed the most toxic
venomand thereby it could induce a more severe
envenomation.
Keywords:
-
Correction
-
Source
-
Cite
-
Save
40
References
59
Citations
NaN
KQI