A comparative analysis of depressive-like behavior: Exploring sex-related differences and insights.

Profiling the variability related to the estrous cycle is essential for assessing depressive-like behavior and screening drugs. This study compares circulating plasma corticosterone levels [CORT] and behavioral alterations in mice exposed to sucrose preference, forced swimming, and tail suspension tests (SPT, FST, and TST, respectively). While SPT exposure did not significantly alter [CORT], FST and TST showed notable changes. Mice in the TST exhibited increased movement and decreased immobility time compared to FST, suggesting a lower likelihood of depressive-like behavior in male mice. Notably, during the proestrus phase, female mice displayed the highest tendency for depressive-like behavior and elevated [CORT], but similar response to antidepressants (imipramine and fluoxetine). The inherent stress of the FST and TST tasks appears to influence [CORT] as well as depressant and antidepressant effects. These comparisons provide valuable insights for further behavioral phenotyping, model sensitivity assessment, and deepen our neurobiological understanding of depression in the context of drug screening.

An internet-based cross-sectional study on infection control practices and drug use for COVID-19 prevention in Nigerian adults.

Introduction: COVID-19 has affected several millions of people globally and various means have been employed to curb the spread. This nationwide survey investigated adherence to infection control protocols and drug uptake among Nigerian adults. Methods: this was a descriptive cross-sectional survey using an internet-based questionnaire to investigate adherence to infection control practices and drug use among adults, who have been resident in Nigeria for at least 6 months. The data was analyzed using Stata software version 16 with levels of significance at p<0.05. Results: a total of 1235 adults participated in the study. The respondents were aged 18-78 years with a mean age of 36.3 ±11.1 years. Over half (53.0%) of the participants were between 31-50 years. The male to female ratio was 1: 1.45. Majority (92.6%) had a minimum of tertiary educational qualification. One hundred (27.1%) reported a positive test result for COVID-19. A total of 1,204 (97.5%) admitted to wearing of face masks, 1,125 (91.1%) washed hands regularly, 1,142 (92.5%) used hand sanitizers while physical distancing was maintained in 985 (79.8%). A total of 854 (69.2%) were on at least a drug or herbal based therapy. Herbal based remedies were used in 112 (9.1%), supplements in 763 (61.8%), antibiotics in 210 (17%), ivermectin in 205 (16.6%), and antimalarials in 128 (10.4%) participants. Conclusion: adherence to behavioural measures was high among the population, with widespread uptake of supplements, antibiotics, and antimalarial drugs. The high uptake of antibiotics emphasizes the need to step up regulatory policies for antibiotic use.

Hormonal and neural responses to restraint stress in an animal model of perimenopause in female rats.

The present study investigated the hormonal and neural responses to stress in a perimenopause animal model induced by 4-vinylcyclohexene diepoxide (VCD), which induces progressive follicular depletion in rodents, allowing studies on the transition to ovarian failure. Female rats, aged 28 days old, were s.c. injected for 15 consecutive days with corn oil or VCD. At 85 ± 5 days after the onset of treatment, the jugular vein was cannulated in the afternoon of metoestrus and in next morning (dioestrus) at 10.00 am, rats were subjected to 30 minutes of restraint stress. Blood samples were withdrawn before (-5 minutes), during (2, 5, 15 and 30 minutes) and after (45, 60 and 90 minutes) stress and plasma prolactin, progesterone and corticosterone levels were measured. Animals were perfused, brains processed for c-Fos/tyrosine hydroxylase (TH) in the locus coeruleus (LC) and c-Fos/corticotrophin-releasing factor (CRF) in the paraventricular nucleus (PVN). In unstressed rats the density of ß-endorphin fibres was assessed in LC and PVN. In VCD-treated rats, stress-induced prolactin peak was higher, basal and peak progesterone levels were lower, and both levels of corticosterone were similar to controls. However, the recovery period was longer for both adrenal hormones. In VCD-treated rats the number of c-Fos/TH and c-Fos/CRF-immunoreactive neurones was higher whereas the density of ß-endorphin fibres was lower in LC and PVN. We surmise that the hyperactivity of the LC and PVN neurones in VCD-treated rats may be a result of the lower progesterone levels that resulted in the decrease of ß-endorphin content in both nuclei, thus impairing the negative-feedback mechanism in the recovery period.