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Growth and paralytic shellfish poisoning toxin production by a Mexican dinoflagellate strain of Alexandrium tamiyavanichii Balech (1994) under different nutrient conditions.
Mar Pollut Bull
January 2024
Centro de Investigaciones Biológicas del Noroeste, S.C. (CIBNOR), Av. I.P.N. 195, Col. Playa Palo de Santa Rita Sur, La Paz, Baja California Sur 23096, Mexico.
Alexandrium tamiyavanichii is a marine dinoflagellate known to produce Paralytic Shellfish Poisoning (PSP) toxin. Thus, a strain was isolated from La Paz Bay, Baja California Sur, Mexico and used to explore whether stress conditions, such as phosphorus limitation (PL) and nitrogen enrichment (NE) modulate population growth and PSP toxin production in the GSe medium. Growth kinetics showed that the PL treatment produced a 3.
View Article and Find Full Text PDFApoptosis of hemocytes from lions-paw scallop Nodipecten subnodosus induced with paralyzing shellfish poison from Gymnodinium catenatum.
Immunobiology
December 2014
Centro de Investigación y de Estudios Avanzados del IPN (CINVESTAV), Av. Instituto Politécnico Nacional #2508, Mexico City, D.F. 07300, Mexico. Electronic address:
The toxic dinoflagellate Gymnodinium catenatum produces paralyzing shellfish poisons (PSPs) that are consumed and accumulated by bivalves. Previously, we recorded a decrease in hemocytes 24h after injection of PSPs (gonyautoxin 2/3 epimers, GTX2/3) in the adductor muscle in the lions-paw scallop Nodipecten subnodosus. In this work, qualitative and quantitative analyses, in in vivo and in vitro experiments, revealed that the lower count of hemocytes results from cells undergoing typical apoptosis when exposed to GTX 2/3 epimers.
View Article and Find Full Text PDFEffects of Cylindrospermopsis raciborskii strains (Woloszynska, 1912) Senayya & Subba Raju on the mobility of Daphnia laevis (Cladocera, Daphniidae).
Braz J Biol
February 2014
Federal University of Itajubá ? UNIFEI, Institute of Natural Resources, Itajubá, MG, Brazil.
Cylindrospermopsis raciborskii is a cyanobacterium distributed worldwide that is known to produce cyanotoxins. Some of the Brazilian strains can produce saxitoxins (STXs), which are classified as neurotoxins and can paralyze cladocerans .Daphnia laevis is a cladoceran with a wide distribution in the Americas and has been studied as a possible test-organism in toxicity bioassays.
View Article and Find Full Text PDFGenomics study of the exposure effect of Gymnodinium catenatum, a paralyzing toxin producer, on Crassostrea gigas' defense system and detoxification genes.
PLoS One
June 2014
Laboratorio de Genética Molecular, Centro de Investigaciones Biológicas del Noroeste (CIBNOR), La Paz, Baja California Sur, México.
Background: Crassostrea gigas accumulates paralytic shellfish toxins (PST) associated with red tide species as Gymnodinium catenatum. Previous studies demonstrated bivalves show variable feeding responses to toxic algae at physiological level; recently, only one study has reported biochemical changes in the transcript level of the genes involved in C. gigas stress response.
View Article and Find Full Text PDFGonyautoxin: new treatment for healing acute and chronic anal fissures.
Dis Colon Rectum
February 2005
Departamento de Cirugia, Seccion Proctologia, Hospital Clinico Universidad de Chile, Casilla 70005, Corrreo 7, Santiago, Chile.
Purpose: The mayor symptoms of chronic anal fissure are permanent pain, intense pain during defecation that lasts for hours, blood in the stools, and sphincter cramps. It is subsequent to formation of fibrosis infiltrate that leads to an increased anal tone with poor healing tendency. This vicious circle leads to fissure recurrence and chronicity.
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