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Caulerpa cupressoides var. lycopodium (Chlorophyta) contains three sulfated polysaccharides (SPs) fractions (SP1, SP2 and SP3); but, their pharmacological properties have been limited. We investigated the antinociceptive activity of non-anticoagulant fraction (SP1) and then its acute toxicological study in male Swiss mice was performed. Animals (19-25 g) received i.v. SP1 30 min. prior to injection 0.8% acetic acid (10 mL kg-1, i.p.); 1% formalin (20 µL, i.pl.) or were subjected to thermal stimuli. Open-field test was also performed. Mice were treated i.p. with SP1 or 0.9% saline (0.1 mL 10 g-1) for 72h. On the 4th day, the animals were anesthetized and sacrificed in order to collect blood and organs. SP1 (3, 9 or  27 mg kg-1) reduced (p < 0.05) the number of writhes induced by acetic acid by 44.21, 47.72 and 90.87%, respectively. SP1 inhibited (p < 0.05) the second phase of the formalin test, without antinociceptive effect in the hot-plate test, suggesting that its analgesic action occurs through of peripheral mechanisms. SP1 did not modify the locomotor activity. SP1 (27 mg kg-1) did not cause hepatic or renal dysfunctions, but affected the spleen of animals (p < 0.05). Therefore, SP1 has analgesic action with high tolerance by the animals, presenting its potential applicability in pain conditions.   </p

acta scientiarum. technology/acta scientiarum. technology

&lt;b&gt;Antinociceptive activity and acute toxicological study of a novel sulfated polysaccharide from &lt;em&gt;Caulerpa cupressoides&lt;/em&gt; var. &lt;em&gt;lycopodium &lt;/em&gt;(Chlorophyta) in Swiss mice&lt;/b&gt; - doi: 10.4025/actascitechnol.v35i3.15365