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The authors wish to make the following corrections to their paper [...].
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Based on prior observations that deoxynivalenol (DON) toxicity is sex-dependent, we compared metabolism and clearance of this toxin in male and female mice. Following intraperitoneal challenge with 1 mg/kg bw DON, the dose used in the aforementioned toxicity study, ELISA and LC-MS/MS analyses revealed that by 24 h, most DON and DON metabolites were excreted via urine (49-86%) as compared to feces (1.2-8.3%). Females excreted DON and its principal metabolites (DON-3-, DON-8,15 hemiketal-8-, and iso-DON-8-glucuronides) in urine more rapidly than males. Metabolite concentrations were typically 2 to 4 times higher in the livers and kidneys of males than females from 1 to 4 h after dosing. Trace levels of DON-3-sulfate and DON-15-sulfate were found in urine, liver and kidneys from females but not males. Fecal excretion of DON and DON sulfonates was approximately 2-fold greater in males than females. Finally, decreased DON clearance rates in males could not be explained by glucuronidation activities in liver and kidney microsomes. To summarize, increased sensitivity of male mice to DON's toxic effects as compared to females corresponds to decreased ability to clear the toxin via urine but did not appear to result from differences in toxin metabolism.
Asunto(s)
Tricotecenos/farmacocinética , Animales , Heces/química , Femenino , Humanos , Riñón/metabolismo , Hígado/metabolismo , Masculino , Ratones Endogámicos C57BL , Microsomas Hepáticos/metabolismo , Caracteres Sexuales , Ácidos Sulfónicos/metabolismo , Tricotecenos/orinaRESUMEN
Deoxynivalenol (DON), a trichothecene mycotoxin that commonly contaminates cereal grains, is a public health concern because of its adverse effects on the gastrointestinal and immune systems. The objective of this study was to compare effects of DON on anorectic responses in aged (22 mos) and adult (3 mos) mice. Aged mice showed increased feed refusal with both acute i.p. (1 mg/kg and 5 mg/kg) and dietary (1, 2.5, 10 ppm) DON exposure in comparison to adult mice. In addition to greater suppression of food intake from dietary DON exposure, aged mice also exhibited greater but transient body weight suppression. When aged mice were acutely exposed to 1 mg/kg bw DON i.p., aged mice displayed elevated DON and DON3GlcA tissue levels and delayed clearance in comparison with adult mice. Acute DON exposure also elicited higher proinflammatory cytokine and satiety hormone responses in the plasma of the aged group compared with the adult group. Increased susceptibility to DON-induced anorexia in aged mice relative to adult mice suggests that advanced life stage could be a critical component in accurate human risk assessments for DON and other trichothecenes.
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Envejecimiento/inmunología , Anorexia/inducido químicamente , Colecistoquinina/sangre , Citocinas/sangre , Péptido YY/sangre , Respuesta de Saciedad/efectos de los fármacos , Tricotecenos/toxicidad , Envejecimiento/sangre , Animales , Anorexia/sangre , Anorexia/inmunología , Peso Corporal , Citocinas/inmunología , Ingestión de Alimentos/efectos de los fármacos , Masculino , Ratones Endogámicos C57BL , Distribución Tisular , Tricotecenos/farmacocinéticaRESUMEN
Deoxynivalenol (DON, vomitoxin), a common trichothecene mycotoxin found in cereal foods, dysregulates immune function and maintenance of energy balance. The purpose of this study was to determine if sex differences are similarly evident in DON's anorectic responses in mice. A bioassay for feed refusal, previously developed by our lab, was used to compare acute i.p. exposures of 1 and 5 mg/kg bw DON in C57BL6 mice. Greater anorectic responses were seen in male than female mice. Male mice had higher organ and plasma concentrations of DON upon acute exposure than their female counterparts. A significant increase in IL-6 plasma levels was also observed in males while cholecystokinin response was higher in females. When effects of sex on food intake and body weight changes were compared after subchronic dietary exposure to 1, 2.5, and 10 ppm DON, males were found again to be more sensitive. Demonstration of male predilection to DON-induced changes in food intake and weight gain might an important consideration in future risk assessment of DON and other trichothecenes.
Asunto(s)
Anorexia/inducido químicamente , Depresores del Apetito/toxicidad , Tricotecenos/toxicidad , Animales , Anorexia/metabolismo , Depresores del Apetito/farmacocinética , Encéfalo/metabolismo , Citocinas/sangre , Ingestión de Alimentos/efectos de los fármacos , Femenino , Riñón/metabolismo , Hígado/metabolismo , Masculino , Ratones , Miocardio/metabolismo , Caracteres Sexuales , Bazo/metabolismo , Distribución Tisular , Tricotecenos/farmacocinética , Aumento de Peso/efectos de los fármacosRESUMEN
Consumption of deoxynivalenol (DON), a trichothecene mycotoxin known to commonly contaminate grain-based foods, suppresses growth of experimental animals, thus raising concerns over its potential to adversely affect young children. Although this growth impairment is believed to result from anorexia, the initiating mechanisms for appetite suppression remain unknown. Here, we tested the hypothesis that DON induces the release of satiety hormones and that this response corresponds to the toxin's anorectic action. Acute ip exposure to DON had no effect on plasma glucagon-like peptide-1, leptin, amylin, pancreatic polypeptide, gastric inhibitory peptide, or ghrelin; however, the toxin was found to robustly elevate peptide YY (PYY) and cholecystokinin (CCK). Specifically, ip exposure to DON at 1 and 5mg/kg bw induced PYY by up to 2.5-fold and CCK by up to 4.1-fold. These responses peaked within 15-120 min and lasted up to 120 min (CCK) and 240 min (PPY), corresponding with depressed rates of food intake. Direct administration of exogenous PYY or CCK similarly caused reduced food intake. Food intake experiments using the NPY2 receptor antagonist BIIE0246 and the CCK1A receptor antagonist devazepide, individually, suggested that PYY mediated DON-induced anorexia but CCK did not. Orolingual exposure to DON induced plasma PYY and CCK elevation and anorexia comparable with that observed for ip exposure. Taken together, these findings suggest that PYY might be one critical mediator of DON-induced anorexia and, ultimately, growth suppression.