Lactiplantibacillus (Lactobacillus) plantarum as a Complementary Treatment to Improve Symptomatology in Neurodegenerative Disease: A Systematic Review of Open Access Literature.

This systematic review addresses the use of Lactiplantibacillus (Lactobacillus) plantarum in the symptomatological intervention of neurodegenerative disease. The existence of gut microbiota dysbiosis has been associated with systemic inflammatory processes present in neurodegenerative disease, creating the opportunity for new treatment strategies. This involves modifying the strains that constitute the gut microbiota to enhance synaptic function through the gut-brain axis. Recent studies have evaluated the beneficial effects of the use of Lactiplantibacillus plantarum on motor and cognitive symptomatology, alone or in combination. This systematic review includes 20 research articles (n = 3 in human and n = 17 in animal models). The main result of this research was that the use of Lactiplantibacillus plantarum alone or in combination produced improvements in symptomatology related to neurodegenerative disease. However, one of the studies included reported negative effects after the administration of Lactiplantibacillus plantarum. This systematic review provides current and relevant information about the use of this probiotic in pathologies that present neurodegenerative processes such as Alzheimer's disease, Parkinson's disease and Multiple Sclerosis.

Gut Microbial Metabolome and Dysbiosis in Neurodegenerative Diseases: Psychobiotics and Fecal Microbiota Transplantation as a Therapeutic Approach-A Comprehensive Narrative Review.

The comprehensive narrative review conducted in this study delves into the mechanisms of communication and action at the molecular level in the human organism. The review addresses the complex mechanism involved in the microbiota-gut-brain axis as well as the implications of alterations in the microbial composition of patients with neurodegenerative diseases. The pathophysiology of neurodegenerative diseases with neuronal loss or death is analyzed, as well as the mechanisms of action of the main metabolites involved in the bidirectional communication through the microbiota-gut-brain axis. In addition, interventions targeting gut microbiota restructuring through fecal microbiota transplantation and the use of psychobiotics-pre- and pro-biotics-are evaluated as an opportunity to reduce the symptomatology associated with neurodegeneration in these pathologies. This review provides valuable information and facilitates a better understanding of the neurobiological mechanisms to be addressed in the treatment of neurodegenerative diseases.

Pre-Exposure Prophylaxis, Anxiety, Depression and Sexual SatisfactionAmong Men Who Have Sex With Men

BACKGROUND: Pre-exposure prophylaxis (PrEP) has been implemented as a prevention against HIV; however, its impact on mental health, sexual and life satisfaction has not been addressed. METHOD: We assessed 114 HIV-negative participants from Spain with ages ranging from 19 to 58 years; 60.5% were PrEP users ( n = 69) and 39.5% were non-users ( n = 45). They completed five questionnaires about life and sexual satisfaction, depression and anxiety. We performed correlations and multiple regression analyses. RESULTS: The PrEP group showed a statistically significant relationship between better sexual satisfaction, and greater life satisfaction. The PrEP group also showed a statistically significant negative relationship with depression and anxiety which was not found in PrEP non-users. Moreover, we found that younger PrEP users had higher scores in anxiety and lower scores in depression than older users. The hierarchical regression analyses also showed that number of sexual partners was a major predictor in the PrEP group for NSSS. CONCLUSIONS: The indirect correlation between sexual satisfaction, depression, and anxiety in the PrEP group could underly the benefits of PrEP for patients' sex lives such as increased sexual liberties due to lower anxiety and mental comfort when experiencing chemsex.

Pre-Exposure Prophylaxis, Anxiety, Depression and Sexual Satisfaction Among Men Who Have Sex With Men / Profilaxis Pre-Exposición, Ansiedad, Depresión y Satisfacción Sexual en Hombres que Tienen Sexo con Otros Hombres

Background: Pre-exposure prophylaxis (PrEP) has been implemented as a prevention against HIV; however, itsimpact on mental health, sexual and life satisfaction has not been addressed. Method: We assessed 114 HIV-negativeparticipants from Spain with ages ranging from 19 to 58 years; 60.5% were PrEP users (n = 69) and 39.5% werenon-users (n = 45). They completed five questionnaires about life and sexual satisfaction, depression and anxiety. Weperformed correlations and multiple regression analyses. Results: The PrEP group showed a statistically significantrelationship between better sexual satisfaction, and greater life satisfaction. The PrEP group also showed a statisticallysignificant negative relationship with depression and anxiety which was not found in PrEP non-users. Moreover, wefound that younger PrEP users had higher scores in anxiety and lower scores in depression than older users. Thehierarchical regression analyses also showed that number of sexual partners was a major predictor in the PrEP group forNSSS. Conclusions: The indirect correlation between sexual satisfaction, depression, and anxiety in the PrEP groupcould underly the benefits of PrEP for patients’ sex lives such as increased sexual liberties due to lower anxiety andmental comfort when experiencing chemsex.

Antecedentes: El impacto de la profilaxis pre-exposición (PrEP) sobre la salud mental, así como en la satisfacción sexualy con la vida son aún desconocidas. Método: Analizamos 114 participantes VIH negativos de España con rango de edad[19-58 años], donde el 60,5% eran usuarios de PrEP (n = 69) y el 39,5% no (n = 45). Completaron cinco tests sobre lasatisfacción sexual y con la vida, la depresión y la ansiedad. Realizamos correlaciones y análisis de regresión múltiple.Resultados: El uso de PrEP correlacionó con un incremento de la satisfacción sexual y con la vida. Mostraron unacorrelación negativa en depresión y ansiedad que no se observó en los no consumidores de PrEP. Los usuarios de PrEPmás jóvenes mostraban puntuaciones más altas en ansiedad y más bajas en depresión que los de mayor edad. Los análisisde regresión jerárquica mostraron que el número de parejas sexuales fue un predictor importante en el grupo de PrEP parala NSSS. Conclusión: La correlación indirecta entre la satisfacción sexual, la depresión y los síntomas de ansiedad en losusuarios de PrEP, podría ser la base de los beneficios que la PrEP puede ofrecer a la vida sexual de los pacientes.(AU)

Targeting DNA Methylation in the Adult Brain through Diet.

Metabolism and nutrition have a significant role in epigenetic modifications such as DNA methylation, which can influence gene expression. Recently, it has been suggested that bioactive nutrients and gut microbiota can alter DNA methylation in the central nervous system (CNS) through the gut-brain axis, playing a crucial role in modulating CNS functions and, finally, behavior. Here, we will focus on the effect of metabolic signals in shaping brain DNA methylation during adulthood. We will provide an overview of potential interactions among diet, gastrointestinal microbiome and epigenetic alterations on brain methylation and behavior. In addition, the impact of different diet challenges on cytosine methylation dynamics in the adult brain will be discussed. Finally, we will explore new ways to modulate DNA hydroxymethylation, which is particularly abundant in neural tissue, through diet.

Dynamics of Goldfish Subregional Hippocampal Pallium Activity throughout Spatial Memory Formation.

The teleost fish hippocampal pallium, like the hippocampus of tetrapods, is essential for relational map-like spatial memories. In mammals, these relational memories involve the dynamic interactions among different hippocampal subregions and between the hippocampus-neocortex network, which performs specialized operations such as memory encoding and retrieval. However, how the teleost hippocampal homologue operates to achieve comparably sophisticated spatial cognition capabilities is largely unknown. In the present study, the progressive changes in the metabolic activity of the pallial regions that have been proposed as possible homologues of the mammalian hippocampus were monitored in goldfish. Quantitative cytochrome oxidase histochemistry was used to measure the level of activation along the rostrocaudal axis of the ventral (Dlv) and dorsal parts of the dorsolateral division (Dld) and in the dorsoposterior division (Dp) of the goldfish telencephalic pallium throughout the time course of the learning process of a spatial memory task. The results revealed a significant increase in spatial memory-related metabolic activity in the Dlv, but not in the Dld, suggesting that the Dlv, but not the Dld, is comparable to the amniote hippocampus. Regarding the Dlv, the level of activation of the precommissural Dlv significantly increased at training onset but progressively declined to finally return to the basal pretraining level when the animals mastered the spatial task. In contrast, the commissural Dlv activation persisted even when the acquisition phase was completed and the animal's performance reached an asymptotic level. These results suggest that, like the dentate gyrus of mammals, the goldfish precommissural Dlv seems to respond nonlinearly to increments of change in sensory input, performing pattern separation under highly dissimilar input patterns. In addition, like the CA3 of mammals, the commissural Dlv likely operates in a continuum between two modes, a pattern separation or storage operation mode at early acquisition when the change in the sensory input is high, probably driven by the precommissural Dlv output, and a pattern completion or recall operation mode when the animals have mastered the task and the change in sensory input is small. Finally, an unexpected result of the present study is the persistent activation of the area Dp throughout the complete spatial task training period, which suggests that the Dp could be an important component of the pallial network involved in spatial memory in goldfish, and supports the hypothesis proposing that the Dp is a specialized part of the hippocampal pallium network.

c-Fos expression correlates with performance on novel object and novel place recognition tests.

In rodents, many studies have been carried out using novelty-preference paradigms. The results show that the perirhinal cortex and the hippocampus are involved in the recognition of a novel object, "what", and its new position, "where", respectively. We employed these two variants of a novelty-preference paradigm to assess whether the expression of the immediate-early gene c-fos in the dorsal hippocampus and perirhinal cortex correlates with the performance discrimination ratio (d2), on the respective versions of the novelty preference tests. A control group (CO) was added to explore c-fos activation not specific to recognition. The results showed different patterns of c-Fos protein expression in the hippocampus and perirhinal cortex. The Where Group presented more c-Fos positive nuclei than the What and CO groups in the CA1 and CA3 regions, whereas in the perirhinal cortex, the What Group showed more c-Fos positive nuclei than the Where and CO groups. The correlation results indicate that levels of c-Fos in the CA1 area and perirhinal cortex correlate with effective exploration, d2, on the respective versions of the novelty preference tests, novel place and novel object recognition. These data suggest that the hippocampal CA1 and perirhinal cortex are specifically related to the level of recognition of place and objects, respectively.

Testosterone response to competition in males is unrelated to opponent familiarity or threat appraisal.

It has been proposed in the literature that the testosterone (T) response to competition in humans may be modulated by cognitive variables. In a previous experiment with a female sample we have reported that opponent familiarity and threat appraisal moderated the T response to competition in women. With this experiment we aim to investigate if these variables have the same impact on males T response to competition, extending the previous findings in our lab. Forty male participants (20 dyads) were recruited to engage in a same sex, face to face competition using the Number Tracking Test as a competitive task. Levels of T, cortisol (C) and dehydroepiandrosterone (DHEA) were measured before and 20 min after the competition. Results show that losers report higher levels of threat than winners and increased their T levels after the competition, however this T change was not predicted by opponent familiarity or threat appraisal. No variation was detected for C and DHEA levels. These findings suggest that there could be sex differences for the moderators/mediators of the T response to competition in humans.

Threat perception and familiarity moderate the androgen response to competition in women.

Social interactions elicit androgen responses whose function has been posited to be the adjustment of androgen-dependent behaviors to social context. The activation of this androgen response is known to be mediated and moderated by psychological factors. In this study we tested the hypothesis that the testosterone (T) changes after a competition are not simply related to its outcome, but rather to the way the subject evaluates the event. In particular we tested two evaluative dimensions of a social interaction: familiarity with the opponent and the subjective evaluation of the outcome as threat or challenge. Challenge/threat occurs in goal relevant situations and represent different motivational states arising from the individuals' subjective evaluation of the interplay between the task demands and coping resources possessed. For challenge the coping resources exceed the task demands, while threat represents a state where coping resources are insufficient to meet the task demands. In this experiment women competed in pairs, against a same sex opponent using the number tracking test as a competitive task. Losers appraised the competition outcome as more threatening than winners, and displayed higher post-competition T levels than winners. No differences were found either for cortisol (C) or for dehydroepiandrosterone. Threat, familiarity with the opponent and T response were associated only in the loser condition. Moderation analysis suggests that for the women that lost the competition the effect of threat on T is moderated by familiarity with the opponent.