Análise tecidual e celular das brânquias de Oreochromis niloticus L. tratadas com extrato etanólico bruto e frações das folhas da pitanga (Eugenia uniflora L.) - Myrtaceae
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Data
2011
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Resumo
Eugenia uniflora L. (Myrtaceae) is a plant found in the Cerrado biome and traditionally used in the
treatment of diarrheas, inflammations, hyperglycemia and hypertension. Previous studies have
revealed in vitro antimicrobial activity of E. uniflora. Considering its popular use, this study aimed
to assess possible systemic cellular and tissue activities of the crude extract and the fractions
from the leaves of this plant on Oreochromis niloticus L. (Nile tilapia) gill. Thus, ethanol extract
and fractions from the leaves of this plant were orally administered to the fish in their rations. After
24 hours, the fish were sacrificed and the second gill arch of each fish was dissected, fixed in
neutral formalin, dehydrated, embedded in paraffin and sectioned. Masson’s trichome and
hematoxylin and eosin (HE) were used in the histological analyses. Qualitative analyses using a
light microscope led to the conclusion that the crude ethanol extract and the fractions from E.
uniflora leaves presented systemic effect on Nile tilapias, affecting the gills. Toxic actions such as
respiratory epithelium detachment and lifting, and hyperplasia of interlamellar epithelial cells were
more pronounced in the tilapias that ingested higher concentrations. This study helped to identify
the vasodilator effect of this plant and contributed to the definition of the Nile tilapia as a model
system for testing plant active principles. These tests are expected to make feasible not only the
use of plants as fish medication but also the maintenance of the health of animals in intensive and
extensive cultures through the possible use of alternatives to synthetic medication.
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Piscicultura, Plantas medicinais, Tilápia nilótica, Pisciculture, Medicinal plants, Nile tilapia
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FIUZA, T. S.; SILVA, P. C.; PAULA, J. R.; TRESVENZOL, L. M. F.; SOUTO, M. E. D.; SABÓIA-MORAIS, S. M. T. Análise tecidual e celular das brânquias de Oreochromis niloticus L. tratadas com extrato etanólico bruto e frações das folhas da pitanga (Eugenia uniflora L.) - Myrtaceae. Revista Brasileira de Plantas Medicinais, Botucatu, v. 13, n. 4, p. 389-395, 2011.