Posttraumatic stress disorder among the Lebanese population and Syrian refugees: A systematic review.

INTRODUCTION: Posttraumatic stress disorder (PTSD) is a severe and disabling condition that can lead to functional impairment and decreased productivity. The purpose of this systematic review was to compile and evaluate existing research on PTSD in Lebanon and among Syrian refugees. METHOD: We searched the databases OVID Medline, EMBASE, and PsycINFO for articles that used validated tools to report the screening or diagnosis of PTSD among our population of interest. RESULTS: We included 102 articles out of a total of 10,367 screened manuscripts. We identified 24 studies discussing PTSD in the Lebanese population and 78 among Syrian refugees. A total of 90 studies described the epidemiological characteristics of PTSD while 12 assessed different treatment options. There was no significant difference in PTSD rates between males and females. We also identified several risks and protective factors for developing PTSD. The former included female gender, marriage, older age, and exposure to war. CONCLUSION: PTSD among Lebanese individuals and Syrian refugees is multifactorial in nature, but commonly involves war-related events. There is a significant evidence gap regarding intervention strategies in this population group. Targeted, multidisciplinary, and holistic interventions are required. (PsycInfo Database Record (c) 2023 APA, all rights reserved).

Western and ketogenic diets in neurological disorders: can you tell the difference?

The prevalence of obesity tripled worldwide between 1975 and 2016, and it is projected that half of the US population will be overweight by 2030. The obesity pandemic is attributed, in part, to the increasing consumption of the high-fat, high-carbohydrate Western diet, which predisposes to the development of the metabolic syndrome and correlates with decreased cognitive performance. In contrast, the high-fat, low-carbohydrate ketogenic diet has potential therapeutic roles and has been used to manage intractable seizures since the early 1920s. The brain accounts for 25% of total body glucose metabolism and, as a result, is especially susceptible to changes in the types of nutrients consumed. Here, we discuss the principles of brain metabolism with a focus on the distinct effects of the Western and ketogenic diets on the progression of neurological diseases such as epilepsy, Parkinson's disease, Alzheimer's disease, and traumatic brain injury, highlighting the need to further explore the potential therapeutic effects of the ketogenic diet and the importance of standardizing dietary formulations to assure the reproducibility of clinical trials.

Modulation of Neuro-Inflammatory Signals in Microglia by Plasma Prekallikrein and Neuronal Cell Debris.

Microglia, the resident phagocytes of the central nervous system and one of the key modulators of the innate immune system, have been shown to play a major role in brain insults. Upon activation in response to neuroinflammation, microglia promote the release of inflammatory mediators as well as promote phagocytosis. Plasma prekallikrein (PKall) has been recently implicated as a mediator of neuroinflammation; nevertheless, its role in mediating microglial activation has not been investigated yet. In the current study, we evaluate the mechanisms through which PKall contributes to microglial activation and release of inflammatory cytokines assessing PKall-related receptors and their dynamics. Murine N9-microglial cells were exposed to PKall (2.5 ng/ml), lipopolysaccharide (100 ng/ml), bradykinin (BK, 0.1 µM), and neuronal cell debris (16.5 µg protein/ml). Gene expression of bradykinin 2 receptor (B2KR), protease-activated receptor 2 (PAR-2), along with cytokines and fibrotic mediators were studied. Bioinformatic analysis was conducted to correlate altered protein changes with microglial activation. To assess receptor dynamics, HOE-140 (1 µM) and GB-83 (2 µM) were used to antagonize the B2KR and PAR-2 receptors, respectively. Also, the role of autophagy in modulating microglial response was evaluated. Data from our work indicate that PKall, LPS, BK, and neuronal cell debris resulted in the activation of microglia and enhanced expression/secretion of inflammatory mediators. Elevated increase in inflammatory mediators was attenuated in the presence of HOE-140 and GB-83, implicating the engagement of these receptors in the activation process coupled with an increase in the expression of B2KR and PAR-2. Finally, the inhibition of autophagy significantly enhanced the release of the cytokine IL-6 which were validated via bioinformatics analysis demonstrating the role of PKall in systematic and brain inflammatory processes. Taken together, we demonstrated that PKall can modulate microglial activation via the engagement of PAR-2 and B2KR where PKall acts as a neuromodulator of inflammatory processes.

Affective temperaments in Lebanese people with substance use disorder.

PURPOSE: To examine these temperaments among patients with substance use disorder (SUD) in the Lebanese population. DESIGN: Case-control. METHODS: Fifty-seven controls and 57 patients with SUD were enrolled between April and September 2017. RESULTS: A significantly higher mean of depressive, irritable, and anxious temperaments was found in addicted patients as compared with the nonaddicts. However, the results of the multivariate analysis showed that anxious, hyperthymic, irritable temperaments would significantly increase the odds of addiction in participants (ORa = 25.20, 1.057, 1.168, 1.241, and 1.275). Cyclothymic temperament would significantly decrease the odds of addiction in participants (ORa = 0.817). Furthermore, suicidality was associated with depressive, anxious, and irritable temperaments. PRACTICE IMPLICATIONS: Hyperthymic, irritable, and anxious temperaments were the main temperaments found in patients with SUD in Lebanon.