Sertraline is a clinically effective Selective Serotonin Reuptake Inhibitor known to increase and stabilize serotonin levels. This neurotransmitter plays an important role in adolescent brain development in both rodents and humans, and its dysregulation has been correlated with deficits in behaviour and emotional regulation. Since prenatal stress may disturb serotoninergic homeostasis, the aim of this study was to examine the long-lasting effects of exposure to sertraline throughout adolescence on behavioural and physiological developmental parameters in prenatally stressed Wistar rats. Sertraline was administered (5mg/kg/day p.o.) from the age of 1-3 months to half of the progeny, of both sexes, of gestating dams stressed by use of a restraint (PS) or not stressed. Our data reveal that long-term sertraline treatment slightly reduced weight gain in both sexes, but reversed the developmental disturbed ‘catch-up’ growth found in PS females. Neither prenatal stress nor Sertraline treatment induced remarkable alterations in behaviour and had no effects on mean startle reflex values. However, a sex-dependent effects of PS was found: in males the PS paradigm slightly increased anxiety-like behaviour in the open field, while in females, it impaired startle habituation. In both cases, sertraline treatment reversed the phenomena. Additionally, the PS animals exhibited a disturbed leukocyte profile in both sexes, which was reversed by sertraline. The present findings are evidence that continuous sertraline administration from adolescence through adulthood is safe in rodents and lessens the impact of prenatal stress in rats.

The stress response is a natural physiological reaction of the organism, elicited to maintain the internal environment and evoke adaptive behaviors, ultimately leading to survival. However, at the turn of the century, stress-related disorders gained increasing significance. The aim of entry is to explore the fundamental question of when the stress system changes from a beneficial to a detrimental system, contributing to a higher risk of the development of disorders and/or diseases. To develop context, here, we explore the different concepts of stress and reveal the complexities, perspectives, and multiple relationships between the neurochemistry, cerebral functional network, and associated pathologies. According to the literature, the stress response affects nearly every biological system through the close interactions between the physiological, nervous, endocrine, and immune systems when faced with a real or perceived threat. Considering today’s challenging times, where people are facing multiple unavoidable adversities in their lives and a level of uncertainty never before seen, this review emphasizes the importance of understanding the potential consequences of being unable to cope with stressful events. Susceptibility and resilience to stress have gained recognition as important areas of study. The literature presented here enhances our understanding and identifies the causes of various psychopathologies, mental health conditions, disabilities, and even mortality that are closely linked to vulnerability to stress. Experimental studies from recent decades have demonstrated the many factors affecting our ability to cope with stress, including differences between individuals due to their genetic background, epigenetic regulation, gender, and early-life experiences. Finally, there is an urgent need to change the paradigm of modern lifestyles as a potential strategy to prevent the spread of the “health epidemic of the 21st century”, which is stress. Therefore, we acknowledge different approaches to enhance resilience, focusing on perception, tolerance, and positive lifestyle behaviors.

Early life stress is a major factor underlying the vulnerability to respond to stressful events later in life. The present study attempted to evaluate the role of prenatal stress affecting the development of stress-related disorders and their reversion by postnatal exposure to Sertraline, a front-line medication for PTSD in humans. To achieve this, adult male and female prenatally stressed (PS) or unstressed (Controls) offspring rats, following oral chronic treatment with Sertraline (5 mg/kg/day) (from 1 month to 4 months old), or not, were studied prior to and after a traumatic event. First, anxiety-like behavior during the prepulse inhibition (PPI) test, a modulation of the startle reflex, was examined in all animals. Subsequently, the animals were subjected to a session of mild inescapable footshocks (IS) (0.35 mA, 5s) in a shuttle box that was followed by four days of situational reminders in the aversive context. Prior to the footshocks no effects of PS or Sertraline were shown, and no changes in PPI and the habituation to the shuttle box were found. After them, PS led animals to exhibit behavioral alterations. When compared to the Controls, PS animals of both sexes displayed less rearing activity in the aversive environment. PS males responded less to footshock delivery and, in most of the animals, fear extinction was impaired. Moreover, the early postnatal exposure to Sertraline lessened the behavioral impact of PS in females, while in males it had no effect. Current results extend previous data from our laboratory, showing that PS heightened vulnerability to stress later on, and that Sertraline acts differently in males and females.

Horses are often still exposed to stressful or inadequate conditions and difficult relationships with humans, despite growing concerns about animal welfare. In the present study, we investigated the impact of different approaches of short-term handling sessions on young Lusitanian horses raised on a high-breed farm, specifically on their later adaptability to humans and stressful environments. Thirty-one foals (3 months old ± 15 days), from both sexes, were separated into three groups, one submitted to 3 consecutive days of handling sessions (Int-H), another to one handling session each month for 3 months (Month-H), and one left undisturbed (control). At 8 months old ± 15 days, all foals were evaluated during behavioral tests (restraint in a stock and forced-person test). Evaluations were based on behavioral observations and physiological assessments. The handled foals (Int-H and Month-H) reacted less to being isolated and restrained and better tolerated human contact and veterinary procedures than the control ones. The handled foals displayed less evasive and negative behaviors toward human approach, but also sought less human contact and did not interact, regardless of the handling timeframe. All animals displayed signs of stress when restrained in the stock, with increased neutrophil counts and CHCM levels in the blood, and no differences in metabolic (CK and LDH) and other hematological parameters. The neutrophil–lymphocyte ratio was significantly higher (p < 0.05) in handled foals than in control ones, suggesting low standards of welfare. Our data suggest that early forced handling decreases fearfulness in new environments; however, it does not improve the horses’ relationship with humans, and it decreases welfare.

The love for horses is deeply rooted in human history and culture, captivating us with their magnificent nature. For millennia, horses have been crucial to human survival and development, providing transportation, labor, and even status. Currently, interest in human relationships with other animals has grown significantly, in the context of promoting the well-being and essential health of both species. This entry aims to explore the possibilities of human–horse relationships, from early interactions to strong bonds. The literature collected here highlights the complexity of this relationship, with special attention to the various biological and social factors involved. The text compares historical practices with current perspectives, examining how these changes affect the relationship between humans and horses. It examines how connecting with horses potentially benefits both humans and horses, underlining the importance of recognizing horse behavior and noting that our assumptions may not reflect their true needs. This literature enriches our understanding of the multifaceted nature of human–horse relationships, offering a new perspective on horse care, which focuses on positive relationship and well-being, and therefore on the importance of harmonious provision of all domains of well-being, highlighting the importance of healthy behavioral interactions and emotional stability of both species.