Exposure of dams to fluoxetine during lactation disturbs maternal behavior but had no effect on the offspring behavior.

Fluoxetine is one of the most commonly prescribed drugs for treatment of depression during pregnancy as well as postpartum. Nevertheless, fluoxetine can cross the placental barrier and/or be secreted through breastmilk and questions remain unanswered regarding safety of the unborn and/or nursing infant. Passive administration of antidepressants to infants can cause neurological developmental delay and/or dysfunction. To date, there are limited studies on neurobehavioral effects due to passive administration of fluoxetine in nursing animals. Thus, the aim of the present study was to evaluate the effects of fluoxetine exposure on the behavior of lactating dams and their offspring. Dams received either 1, 10 or 20 mg/kg fluoxetine via oral gavage (controls received water alone) from lactating day (LD) 1 to 21. Maternal behavioral studies were conducted from LD5 to LD7 and offspring studies were conducted from LD2 to LD60. Results showed dysfunction in maternal behavior, both in direct and indirect behavior, but there were no differences and/or deficiencies observed in offspring behavior. These data suggest that the impairment of dams maternal behavior combined with the amount of fluoxetine that the offspring received through breast milk during lactation did not alter their social behavior in infancy and/or adulthood, suggesting no neurodevelopmental damage associated with maternal use of fluoxetine. This study contributes to the field of human psychiatric diseases by further elucidating the effects of antidepressant medications on the health of mothers as well as children who were passively exposed to drug treatment.

Prolonged exposure of rats to varenicline increases anxiety and alters serotonergic system, but has no effect on memory.

Varenicline is a drug used for smoking addiction cessation treatment and acts as a partial agonist of nicotinic cholinergic receptors. Recent clinical trial data support use of varenicline for treatment of conditions/addictions that are not related to smoking cessation. Considering the importance of this issue and the need for new studies on its effects, especially on behavior, more studies using animal models are necessary. Thus, the aim of this study was to evaluate the effects of prolonged exposure to varenicline in anxiety-like behavior and memory, as well as in cerebral neurochemistry of rats. Male rats received three different doses of varenicline: 0.03 (therapeutic dose for humans), 0.1 and 0.3 mg/kg orally (gavage) for 30 days. Animal behavior was analyzed through open field, elevated plus maze, light/dark box, social interaction, Barnes maze and novel object recognition tests. Neurotransmitter levels and their metabolites in different brain structures (hippocampus, striatum and frontal cortex) were measured. Results showed that prolonged exposure of rats to varenicline: 1) did not interfere in motor activity, but caused an anxiogenic effect on elevated plus maze, light/dark box and social interaction testes; 2) did not alter memory; and 3) promoted alterations on serotoninergic system in the striatum and frontal cortex. In conclusion, compilation of the data indicates that prolonged exposure of rats to varenicline promoted anxiogenic effects and alteration in serotonergic system, which corroborated behavioral findings.

Ivermectin acute administration impaired the spermatogenesis and spermiogenesis of adult rats.

Ivermectin (IVM) is an antiparasitic agent widely used in agricultural, domestic animals and in human clinical practice. In the present study, the temporal effects of therapeutic doses of IVM in the morphometric and histological assessment of testis were studied to verify if IVM acute administration impaired the spermatogenesis and spermiogenesis of adult rats, if these effects are reversible. The testosterone levels and the plasmatic IVM levels were assessed. The results show: 1) IVM acute exposure, mainly in the higher dose, reduced the testicular volume, the tubular diameter and the germinal epithelium height; 2) no interferences on Leydig cells frequency; 3) histological studies show that tubular sections containing several histological changes indicative of spermatogenesis interruption, such as disorganization of germinal epithelium, vacuolar degeneration of the germ cells and sloughing of cells into the tubular lumen; 4) no differences in testosterone levels; 5) The IVM plasmatic levels were significantly reduced at 72h after the 0.2mg/kg. It was concluded that acute IVM impaired the spermatogenesis and spermiogenesis of rats. Probably these effects were not consequence of IVM at the Leydig cells because no effects were observed at this level. Finally, our results suggest that some testicular effects are reversible and correlated with the plasmatic levels of IVM.

Evaluation of Prolonged Exposure to Varenicline in Adult Rats: Haematological, Biochemical and Anatomopathological Studies.

Varenicline is a synthetic chemical substance produced from the alkaloid cytisine, used for smoking treatment, which acts as a partial agonist for α4ß2 and α3ß4 nicotinic cholinergic receptors and as a total agonist for α7 receptor. While there are studies regarding varenicline's non-smoking-related effects, as in treatment for drug dependence, there are no studies in the literature evaluating the long-term toxicity of varenicline through a physiological approach. Thus, the aim of this study was to evaluate possible toxicity through haematological, biochemical and anatomopathological parameters of prolonged exposure (30 days) to varenicline in rats. Three doses of varenicline were used: 0.03 (therapeutic dose for human beings), 0.1 and 0.3 mg/kg orally (gavage). Body-weight, water and food intake were measured weekly during treatment. On the 30th treatment day, blood and various organs were collected for haematological, biochemical and anatomopathological evaluations. The results show a decrease in some biochemical parameters in animals from the 0.1 and 0.3 mg/kg group, although the values are within the normal range of the species. There were no changes in the other evaluations performed. Together, these data indicate that prolonged exposure of rats to different doses of varenicline was not able to alter haematological, biochemical and anatomopathological parameters.

Development and validation of carbofuran and 3-hydroxycarbofuran analysis by high-pressure liquid chromatography with diode array detector (HPLC-DAD) for forensic Veterinary Medicine.

Agricultural pesticides used with the criminal intent to intoxicate domestic and wild animals are a serious concern in Veterinary Medicine. In order to identify the pesticide carbofuran and its metabolite 3- hydroxycarbofuran in animals suspected of exogenous intoxication a high pressure liquid chromatography with diode array detector (HPLC-DAD) method was developed and validated in stomach contents, liver, vitreous humor and blood. The method was evaluated using biological samples from seven different animal species. The following parameters of analytical validation were evaluated: linearity, precision, accuracy, selectivity, recovery and matrix effect. The method was linear at the range of 6.25-100µg/mL and the correlation coefficient (r2) values were >0.9811 for all matrices. The precision and accuracy of the method was determined by coefficient of variation (CV) and the relative standard deviation error (RSE), and both were less than 15%. Recovery ranged from 74.29 to 100.1% for carbofuran and from 64.72 to 100.61% for 3-hydroxycarbofuran. There were no significant interfering peaks or matrix effects. This method was suitable for detecting 25 positive cases for carbofuran amongst a total of 64 animal samples suspected of poisoning brought to the Toxicology Diagnostic Laboratory, School of Veterinary Medicine and Animal Sciences, University of Sao Paulo.

Phytochemical study of Solanum lycocarpum (St. Hil) unripe fruit and its effects on rat gestation.

Solanum lycocarpum, St. Hil (Solanaceae) is a common native shrub in the Brazilian cerrado. The fruits are used in folk medicine as a hypoglycaemic agent in the management of diabetes, obesity and to decrease cholesterol levels. In this study the glycoalkaloids, solamargine and solasonine, were isolated from unripe fruits of S. lycocarpum. To evaluate the effects of the fruits on gestation, pregnant rats (n=25) were fed from day 6 to 22 with chow containing 10% of dried and ground unripe fruits. The control group (n=21) received regular chow. During and after the treatment period the dams showed reduced body weight and slower body weight gain, even with no change in food and water intake, evidencing mild maternal toxicity. Gestation was not significantly impaired, although experimental fetuses presented reduced body length at birth. Also, 20% of the treated dams showed one or two dead pups at birth. On day 22 of gestation and on post-natal day 1, the levels of metabolites of the sex hormones oestradiol, progesterone and testosterone were measured in faeces by radioimmunoassay. On post-natal day 1, tissue portions from the dams were collected for histopathological evaluation. No alterations were detected in either study. The results suggest that S. lycocarpum fruit did not impair gestation, however, it did promote mild maternal toxicity and mild fetotoxic effects if ingested as a food source during the gestation period. This study has implications for pregnant women, who employ phytotherapeutic formulations under the impression that they are harmless.

Chemopreventive effects of Paullinia cupana Mart var. sorbilis, the guaraná, on mouse hepatocarcinogenesis.

Guaraná (Paullinia cupana) is originally from Amazon, Brazil. Its effects on mouse hepatocarcinogenesis have been investigated in this study. Mice were treated with N-nitrosodiethylamine (DEN), received three different doses of P. cupana added to commercial food, and euthanized after 25 weeks. Gross lesions were quantified, and preneoplastic lesions (PNL) were histologically measured. Cellular proliferation was evaluated by immunobloting for the proliferating cell nuclear antigen (PCNA). The incidence and multiplicity of macroscopic lesions were reduced. The PNL number and PCNA expression were reduced in the highest P. cupana dose. According to these results, guaraná presented inhibitory effects on DEN hepatocarcinogenesis in mice.

Evaluation of Tiletamine-Zolazepam as an Anesthetic in Quail (Coturnix coturnix japonica).

The objective of the present study was to evaluate the effects of tiletamine-zolazepam (TZ) administered alone or in combination with atropine, xylazine, and levomepromazine to quail (Coturnix coturnix japonica). The induction time, duration of hypnosis and anesthesia, and time to recovery were determined. The presence or absence of tremor, upper respiratory tract secretions, and excitability and the degree of muscular tone were also observed. The results showed that doses from 10 to 100 mg/kg TZ administered alone or in combination with xylazine or levomepromazine failed to produce anesthesia; only hypnosis was obtained in a dose-dependent manner. Immediately after injection of the drug, histopathologic examination of the site of drug injection indicated the presence of discrete acute focal myositis. After 21 days, a discrete fibrosis between muscle fibers was detected in the pectoral muscle as a sign of scarring. We conclude that the administration of TZ to a dose of 100 mg/kg does not produce anesthesia in quail. For noninvasive and minimally painful procedures requiring chemical restraint and recumbency, the recommended dose is 30 mg/kg.