Chronic defeat stress induces monoamine level dysregulation in the prefrontal cortex but not in the hippocampus of OF1 male mice.

Chronic social stress can increase susceptibility to chronic diseases such as depression. One of the most used models to study the physiological mechanisms and behavioral outcomes of this type of stress is chronic defeat stress (CDS) in male mice. OF1 male mice were subjected to a stress period lasting 18 days. During that time, non-stressed animals were housed in groups. The cluster analysis of the behavioral profile displayed during the first social interaction divided subjects into two groups: active/aggressive (AA) and passive/reactive (PR). The day after the end of the stress period, the following behavioral analyses were performed: the sucrose preference test (SPT) on day 19, the open field test (OFT) on day 20, and the forced swim test (FST) on day 21. Immediately after completing the last test, animals were weighed, and blood samples were obtained. Then, they were sacrificed, and their prefrontal cortices and hippocampi were removed and stored to analyze monoamine levels. Stressed animals displayed anhedonia, and solely the PR mice continued to show higher levels of immobility in the OFT and FST. All stressed animals, regardless of the coping strategy, presented higher plasma corticosterone levels. In addition, stressed mice showed lower levels of tyrosine, dopamine, DOPAC, MHPG, kynurenine, kynurenic acid, and 5-HIAA levels but higher serotonin levels in the prefrontal cortex, not in the hippocampus. In conclusion, our results show that CSD induces differences in monoamine levels between brain areas, and these differences did not respond to the coping strategy adopted.

Perceived professional quality of life and mental well-being among animal facility personnel in Spain.

Animal facility personnel provide the husbandry and care of laboratory animals. We aimed to investigate their work-related quality of life, empathy and mental well-being. Participants living in Spain were contacted by email and asked to complete an anonymous online questionnaire, in which they answered the Professional Quality of Life scale, the Cognitive and affective empathy test, the Warwick-Edinburgh Mental Well-Being Scale, and their perceived human-animal interaction. Participants were asked whether they were receiving psychological therapy or were taking anxiolytics, hypnotics or antidepressant medication. The study comprised 80 participants. No differences were observed related to personal or professional variables. Participants working with small carnivores reported higher total empathy, and those working with non-human primates reported higher emotional comprehension. Higher human-animal interaction was reported by participants working with small carnivores, farm animals and non-human primates. More than half of the participants reported high levels of mental well-being, positively correlated with emotional comprehension, emphatic joy and compassion satisfaction. Participants working with farm animals reported higher levels of secondary traumatic stress that was positively correlated with human-animal interaction and negatively with mental well-being. Most participants reported low-average levels of burnout, which was negatively correlated with mental well-being. The percentage of animal facility personnel in psychotherapy was higher than in the general population, and the consumption of anxiolytics was a little lower and antidepressants higher. Overall, our results indicate that animal-facility personnel who felt stress or worse mental well-being were in therapy and took medication to improve their condition.

The role of sociability in social instability stress: Behavioral, neuroendocrine and monoaminergic effects.

Extensive literature has reported a link between social stress and mental health. In this complex relationship, individual strategies for coping with social stress are thought to have a possible modulating effect, with sociability being a key factor. Despite the higher incidence of affective disorders in females and sex-related neurochemical differences, female populations have been understudied. The aim of the present study was, therefore, to analyze the behavioral, neuroendocrine, and neurochemical effects of stress in female OF1 mice, paying special attention to social connectedness (female mice with high vs low sociability). To this end, subjects were exposed to the Chronic Social Instability Stress (CSIS) model for four weeks. Although female mice exposed to CSIS had increased arousal, there was no evidence of depressive-like behavior. Neither did exposure to CSIS affect corticosterone levels, although it did increase the MR/GR ratio by decreasing GR expression. Female mice exposed to CSIS had higher noradrenaline and dopamine levels in the hippocampus and striatum respectively, with a lower monoaminergic turnover, resulting in an increased arousal. CSIS increased serotonin levels in both the hippocampus and striatum. Similarly, CSIS was found to reduce kynurenic acid, 3-HK, and IDO and iNOS enzyme levels in the hippocampus. Interestingly, the observed decrease in IDO synthesis and the increased serotonin and dopamine levels in the striatum were only found in subjects with high sociability. These highly sociable female mice also had significantly lower levels of noradrenaline in the striatum after CSIS application. Overall, our model has produced neuroendocrine and neurochemical but not behavioral changes, so it has not allowed us to study sociability in depth. Therefore, a model that induces both molecular and behavioral phenotypes should be applied to determine the role of sociability.

Professional quality of life among Spanish veterinarians.

Background: In Spain, the perceived professional quality of life among veterinarians has not been explored. Methods: Veterinarians were invited to complete an online questionnaire in which they answered the Professional Quality of Life scale, the Medical Outcomes Study Social Support Survey and the Warwick-Edinburgh Mental Well-Being Scale. Participants were asked whether they were receiving psychological therapy or were taking anxiolytics, hypnotics or antidepressant medication. Alcohol consumption was measured using the Alcohol Use Disorders Identification Test and nicotine dependence was assessed using the Fagerström test; participants were asked whether they took illegal drugs. Results: The study sample comprised a total of 602 veterinarians, most of whom reported average levels of compassion satisfaction, secondary stress trauma and burnout. Emotional support and mental wellbeing influenced participants' professional quality of life. The percentage of veterinarians in psychological therapy and/or taking anxiolytics was higher than in the general population. Conclusions: A considerable number of clinical veterinarians in Spain may be suffering from work-related stress. Our study identifies salary, emotional support and mental wellbeing as important factors that affect the professional quality of life. Interventions to improve veterinary clinicians' professional quality of life should therefore focus on these factors.

Gender awareness is also nurses' business: Measuring sensitivity and role ideology towards patients.

AIM: This study aims to validate the Nijmegen Gender Awareness in Medicine Scale, which assesses gender sensitivity and gender-role ideology towards patients in the Spanish language for use among physicians and nurses. BACKGROUND: Women are more likely to suffer pain, delays and health consequences related to low therapeutic effort. Health professionals' gender awareness may minimize such bias; however, the only instrument to assess such awareness is limited to physicians and lacks a Spanish version. METHODS: After using the back-translation method, a sample of 167 Spanish nurses and nursing students completed the instrument. In order to obtain additional validity evidence, 98 health professionals filled in gender sensitivity and gender-role ideology towards patients' subscales and the short versions of the Ambivalent Sexism Inventory. RESULTS: Gender-role ideology towards patients correlated strongly with sexist attitudes, demonstrating convergent validity, and Cronbach's alpha coefficients showed an adequate internal consistency. CONCLUSIONS: Nijmegen Gender Awareness in Medicine Scale perfectly applies to nurse population, and this adaptation also broadens its use for Spanish professionals. IMPLICATIONS FOR NURSING MANAGEMENT: Nurse managers and educators can use this applicable tool to treat low gender awareness levels as a modifiable risk factor and promote a gender-sensitive caring culture.

A survey on the use of mice, pigs, dogs and monkeys as animal models in biomedical research in Spain.

BACKGROUND: The use of animals in biomedical science remains controversial. An individual's level of concern is generally influenced by their culture, previous or current experience with animals, and the specific animal species in question. In this study we aimed to explore what people in Spain who had never or who no longer worked with laboratory animals thought of the use of mice, pigs, dogs and monkeys for biomedical research purposes. We also aimed to determine whether or not people currently involved in biomedical research with the aforementioned species felt their work was justified. RESULTS: The study comprised a total of 807 participants (never worked = 285, used to work = 56, currently working = 466), almost two thirds of whom were women. Our results revealed that the phylogenetic scale is an important factor in people's opinions of the use of certain species in research. The percentage of people who were against the use of dogs or monkeys was higher than that of those who were against the use of mice or pigs. The main reasons given for having stopped working with laboratory animals were change of professional career and change in research project. Participants who were currently working with animals believed that their work was justified, but said they did not talk about it with people outside their immediate social circle. CONCLUSIONS: Our findings suggest that there is a difference in moral status between monkeys and mice, as well as between companion animals (dogs) and farm animals (pigs). Our results support the idea that working with laboratory animals is a sensitive issue in Spain.

The Impact of Sexism and Gender Stereotypes on the Legitimization of Women's Low Back Pain.

BACKGROUND: Low back pain is the worldwide leading cause of disability and, even though women's pain experience is more severe, frequent, and enduring, female patients are often underdiagnosed and undertreated. Health professionals' gender stereotypes and social norms may underlie the downgrading of pain. AIM: This pilot study aimed to examine the legitimation of low back pain by health professionals in relation to the sex of the patient as well as their gender awareness and the relationship between them. METHOD: This study had a cross-sectional design. Eighty health professionals and students selected by convenience answered a 4-part online questionnaire. The eligibility criteria for participants were: aged >18 years, students in the last course of nursing/medicine or a physician/nurse, and Spanish-speaking. The questionnaire comprises: (1) a between-subjects virtual clinical low back pain case with four random versions (female/male patient and evidence/non-evidence of pathology); (2) the Spanish version of Nijmegen Gender Awareness Scale (S-NGAMS); (3) Ambivalent Sexism Inventory (ASI); and (4) Ambivalence toward Men Inventory (AMI). RESULTS: The total score of legitimation of low back pain correlated negatively with gender role ideology and sexism scales (when the virtual patient was female), as well as the subscales of willingness to offer support and credibility. CONCLUSIONS: Both sexism and gender role ideology could undermine the legitimation of low back pain, the willingness to offer support, and credibility only in female patients. The results showed a possible gender bias in low back pain assessment in health professionals. Low gender sensitivity and high sexism must be treated as modifiable risk factors for health inequities in pain care.

Professional Quality of Life in Research Involving Laboratory Animals.

Many workers contribute to the success of animal welfare and study outcomes in biomedical research. However, the professional quality of life (ProQoL) of those who work with laboratory animals has not been explored in Spain. To this end, we adapted the ProQoL scale to the Spanish population working with laboratory animals. Participants were contacted by email and asked to complete an anonymous on-line questionnaire. The study comprised a total of 498 participants, 12.4% welfare officers/veterinarians, 19.5% caretaker/technicians, 13.9% principal investigators, 20.7% investigators, 13.6% research technicians, and 19.9% PhD students. The adapted scale revealed very good reliability and internal validity, providing information about two different subscales, compassion satisfaction and compassion fatigue. Animal-facility personnel showed higher total ProQoL and compassion-satisfaction scores than researchers; PhD students showed the lowest scores. Thus, our results indicate that job category is a contributing factor in perceived professional quality of life. We observed that compassion satisfaction is negatively associated with the perceived animal stress/pain. Participants reporting poorer compassion satisfaction also reported lower social-support scores. Overall, our ProQoL scale is a useful tool for analyzing the professional quality of life in the Spanish population, and may help to design future interventions to improve workplace wellbeing in Spain and other Spanish-speaking populations.

Working with laboratory rodents in Spain: a survey on welfare and wellbeing.

BACKGROUND: Replacement, reduction and refinement, the 3R principles, provide a framework to minimize the use and suffering of animals in science. In this context, we aimed to determine the actual perception that individuals working with laboratory rodents in biomedical research have on animal welfare and on their interaction with the animals, as well as how they perceive its impact on their social relations. To this end, we designed an anonymous on-line survey for people working with rodents, at three responsibility levels, in Spain. RESULTS: Of the 356 participants, 239 were women (67 %); 263 were researchers (74 %), and 93 animal facility staff (26 %), of which 55 were caretakers/technicians (15 %), and 38 welfare officer/veterinarians (11 %). Animal facility staff indicated environmental enrichment to be a universal practice. About half of the participants reported that, in their opinion, animals suffer "little to none" or "minor" stress and pain. Animal caretakers/technicians and researchers perceived higher levels of stress and pain than welfare officers/veterinarians. Participants judged decapitation the most unpleasant method to kill rodents, whereas anaesthetic overdose was the least one. A sizable proportion - 21 % of animal caretakers/technicians and 11.4 % of researchers - stated that they were never given the choice not to euthanize the rodents they work with. Overall, women reported higher interactions with animals than men. Nevertheless, we could detect a significant correlation between time spent with the animals and interaction scores. Notably, 80 % of animal facility staff and 92 % of researchers rarely talked about their work with laboratory rodents with people outside their inner social circle. CONCLUSIONS: Overall, the participants showed high awareness and sensitivity to rodent wellbeing; animal facility staff reported a similar perception on welfare questions, independently of their category, while researchers, who spent less time with the animals, showed less awareness and manifested lower human-animal interaction and less social support. Regarding the perception on social acceptance of laboratory animal work, all groups were cautious and rarely talked about their job, suggesting that it is considered a sensitive issue in Spain.

Venlafaxine reduces the striatal il6/il10 ratio and increases hippocampal GR expression in female mice subjected to chronic social instability stress.

Women are twice as likely as men to develop depression and antidepressant treatment is more frequent in females. Moreover, neuroinflammatory changes related to affective disorders differ in accordance with sex. Despite this evidence, female populations have been largely omitted from preclinical experiments studying antidepressants. The aim of this work is to analyze the potential restorative effect of venlafaxine on an animal model of depression. Female CD1 mice were subjected to chronic social instability (CSI) stress for 7 weeks, and were administered venlafaxine during the last 3 weeks of the stress period. Behavioral and physiological parameters were then analyzed. Stressed mice showed a decreased sucrose preference and increased whisking behavior, and had a lower body weight, higher plasma corticosterone levels and increased hypothalamic GR expression. They also had lower levels of 5-HT, 5-HIAA and NA and a higher KYN/TRYP ratio in the hippocampus. Moreover, CSI increased striatal IL-6 mRNA expression levels. Venlafaxine treatment reduced the striatal IL-6/IL-10 ratio and increased hippocampal GR expression, although it did not reverse stress-induced behavioral changes. In conclusion, seven weeks of exposure to CSI produced depressive-like alterations in female mice. The venlafaxine treatment regimen was found to have a modest anti-inflammatory effect in the striatum and increased hippocampal GR mRNA, although it failed to redress stress-induced behavioral disturbances.

Behavioral coping strategies predict tumor development and behavioral impairment after chronic social stress in mice.

The aims of this study were to identify behavioral strategies to cope with social defeat, evaluate their impact on tumor development and analyze the contributions of both to changes in physiology and behavior produced by chronic defeat stress. For this purpose, OF1 mice were inoculated with B16F10 melanoma cells and subjected to 18 days of repeated defeat stress in the presence of a resident selected for consistent levels of aggression. Combined cluster and discriminant analyses of behavior that manifested during the first social interaction identified three types of behavioral profiles: active/aggressive (AA), passive/reactive (PR) and an intermediate active/non-aggressive (ANA) profile. Animals that showed a PR coping strategy developed more pulmonary metastases at the end of the social stress period than animals in other groups. The ANA but not AA group also showed higher tumor metastases than non-stressed subjects. In addition, the ANA group differed from the other groups because it displayed the highest corticosterone levels after the first interaction. Chronic stress reduced sucrose consumption, which indicates anhedonia, in all the stressed groups. However, the PR subjects exhibited a longer immobility time and swam for less time than other subjects in the forced swim test (FST), and they travelled a shorter distance in the open field test (OFT). In this test, the ANA group also travelled smaller distances than the non-stressed group, but the difference was more moderate. In contrast, tumor development but not stress increased behaviors associated with anxiety in the OFT (e.g., time in the center) in all tumor-bearing subjects. In summary, although the effects of social stress and tumor development on behavior were rather moderate, the results indicate the importance of behavioral coping strategies in modulating the effects of chronic stress on health.

Social instability in female rodents as a model of stress related disorders: A systematic review.

The risk of developing stress related disorders such as depression is two times higher in women than in men, and social stress is considered the principal etiology for this disorder. Social defeat animal model is the most common procedure to induce social stress in male rodents, but the stressful stimulus and the stress response can be different for each sex. In this regard, social defeat stress model does not fit the social nature of females, and according to the emerging evidence, the social instability stress (SIS) model could be a suitable procedure to investigate this stress related disorder in females. This study aims to systematically review the effects of SIS on physiological and behavioral parameters involved in the pathophysiology of depression, following the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) method on PubMed, Medline and Web of Science. Seventeen studies met the inclusion criteria. The reported physiological measures comprised the hypothalamic-pituitary-adrenal axis activity, neurotrophic factors, immune and monoaminergic systems, vasopressin and oxytocin receptors, sex hormone levels and estrus cycle, while main behavioral measures involved sucrose preference test, forced swimming test, elevated plus maze, open field test and social interaction. This systematic review revealed a wide variability on the social instability regimen and on the measured variables. However, all studies agree that SIS model can elicit behavioral and physiological alteration involved in stress related disorders, with HPA axis hyperactivity, increased anxiety-like behavior and disrupted reward system being the most repeated outcomes. A unified SIS application criterion is required in order to obtain consistent data and elucidate the underlying mechanisms of anxiety and depression in females.

Biological Sex Differences in Depression: A Systematic Review.

Depression is the leading cause of disability worldwide, and its prevalence is 2 times higher in women than in men. There is, however, a lack of data on sex-specific pathophysiology of this disorder. The purpose of this systematic review is to identify the biological sex differences found in major depressive disorder (MDD) in studies published in the last 10 years. We conducted a literature search using the Medline, PsycInfo, PubMed, and Web of Science databases, selecting English-language studies that included physiological measures compared by sex in addition to MDD. We identified 20 relevant studies, which consisted primarily of mixed methodology and samples. The reported physiological measures comprised a variety of serum biomarkers, gene mRNA expression, and brain activity. Findings suggest different biological patterns in those with MDD depending on sex. Specifically, women presented higher levels of inflammatory, neurotrophic, and serotonergic markers and a stronger correlation between levels of some inflammatory and neurotrophic factors and the severity of symptoms. This review provides information about possible different biological patterns for women and men with depressive disorder and may have important implications for treatment. Future research should include homogeneous samples; make comparisons based on sex, control sex hormone fluctuations and pharmacological treatment; and use consistent criteria for evaluating psychobiological changes in MDD.