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Abstract
Aims: The present study was aimed to assess the cytotoxic effects of not-yet identified compounds present in organ extracts of Sarpa salpa, collected in autumn, the period with a peak in health problems.
Methods: The toxicity was assessed by mouse bioassay of extract of the fish’s organs. Wistar rats received daily extracts of different organs of S. salpa by gastric gavage for 7 d (0.3 ml of extract/100 g body weight, BW). The dose of tissue extracts of viscera, liver, brain and flesh of S. salpa administered to rats were as follows: 17.2, 31.3, 205, 266 mg/100g BW, respectively. No deaths occurred during the period of treatment.
Results: The lethal dose (LD50%) determined for the crude ciguatoxin (neurotoxins) extracts of viscera, liver, brain and flesh of S. salpa were as follows: 1.2, 2.2, 14.4, 18.6 g/kg mouse, respectively. Changes in locomotor activity during the first 2 h and failure breathing and no evident signs of gastrointestinal problems were recorded. We observed: (1) Induction of oxidative stress, indicated by an increase in lipid peroxidation (TBARS) in groups that received extracts of liver (+490%) or viscera (+592%). Accompanied by a significant decrease in antioxidant enzyme activities (SOD, CAT, GPx) in liver tissue by 15%, 17%, 18% (LT: animals receiving liver extracts) and by 19%, 22%, 22% (VT: animals receiving viscera extracts), respectively. In contrast the administration of extracts of flesh and brain induced an increase in antioxidant enzyme activities (SOD, CAT, GPx) in liver tissue by 15%, 19%, 15% (FT: flesh extract) and 18%, 55%, 55% (BT: brain extract), respectively; (2) A significant increase in total metallothionein levels in liver tissue was recorded in (FT), (BT), (LT) and (VT) by 55%, 88%, 255% and 277%, respectively, (3) The histological findings confirmed the biochemical results.
Conclusions: Liver and especially visceral part of S. salpa presented toxicity, which clearly indicates the danger of using this fish as food.