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Background: Parkinson disease (PD) is a prevalent neurodegenerative disorder affecting dopaminergic neurons in the substantia nigra (SN). Neuroinflammation has a vital role in PD pathophysiology. Objectives: This study assesses whether the neuroinflammatory molecular and signaling pathways could be associated with PD’s progression and clinical manifestations. Materials & Methods: PubMed, Web of Science, Embase, and Scopus databases were investigated from 2006 until December 2023 to find relevant studies. All observational studies written in English and reporting qualitative or quantitative information on the relationship between neuroinflammation and PD were included in this review. Results: Finally, 41 papers were involved in the systematic review. According to the involved studies, it is suggested that tumor necrosis factor-α, C-reactive protein, microsomal prostaglandin E synthase1, toll-like receptor-4 (TLR-4), CCL23, CCL25, TNF-receptor superfamily member 9, EV-derived cytokines, transforming growth factor alpha, vascular endothelial growth factor A, SH-SY5Y, TLR 2/4, miR-485-3p, leucine-rich repeat kinase 2, and α-synuclein may be upregulated in the PD patients. Also, the activity of astrocytes and microglial cells was reported to be increased in PD patients through different mechanisms. Conclusion: This study demonstrated that the neurodegeneration in PD could be initiated by α-synuclein protein aggregation and the activation of astrocytes and microglial cells, which leads to neuroinflammation characterized by inflammatory responses in neurons. Finally, chronic neuroinflammation could be the cause of dopaminergic neuronal death in SN. The impact of both single and all factors involved in neuroinflammation was assessed to plan further studies in a particular pathway to intercept the onset of inflammatory pathways in favor of therapeutic purposes.

Background: Alterations in the kynurenine pathway (KP) metabolite can contribute to the pathogenesis and progression of many psychiatric and neurodegenerative illnesses, including Alzheimer disease (AD) and Huntington disease (HD), primarily through neuroinflammatory pathways and generating neurotoxic metabolites. Objectives: This systematic review highlights the evidence obtained by in vivo animal studies on alterations in KP metabolites and enzymes in AD and HD. Materials & Methods: We searched PubMed, Scopus, Web of Science, and EMBASE databases from the beginning of 2000 to January 2024 and included English-language in vivo articles comparing levels of KP metabolites or enzymes in rats or mice AD or HD models with controls. Results: A total of 19 studies, comprising 93 experimental and 95 control animals, were included. In AD models compared to controls, the following changes were reported: higher levels of tryptophan (TRP) in blood; higher kynurenine (KYN) levels in the cortex, hippocampus, hypothalamus, and prefrontal cortex; higher quinolinic acid (QUIN) levels in the hippocampus and cerebrum; higher indoleamine 2,3-dioxygenases levels in the cerebrum, prefrontal cortex, and hippocampus; and a higher KYN/TRP ratio in the hippocampus, cortex, and cerebellum. Reports on HD models compared to controls showed higher 3-hydroxykynurenine levels in the striatum and cortex and lowered TRP levels in the striatum. Conclusion: According to the primary outcomes, KP alterations may lead to the progression of AD and HD. These two diseases can also change the KP pathway factors. Here, we highlighted that changes in the KP metabolites and enzyme levels can help diagnose and treat these diseases.

Background: The purpose of this systematic review was to assess different studies that worked on university students’ health literacy during covid19 pandemic and to make an overview of this issue to recognize possible determinants associated with health literacy. Methods: This review was conducted following the Preferred Reporting Items for Systematic Reviews and Meta-analysis (PRISMA). Four databases (Google Scholar, Web of Science, Pubmed, and Scopus) were used for searching cross-sectional works that assessed the health literacy of university students. We searched papers from December 1st, 2019 up to June 10th, 2022. English language articles were used. Studies were done in countries including; Iran, Pakistan, the USA, Vietnam, China, Colombia, Germany, and Indonesia. Results: The systematic review contains 12 research studies involving 17773 students. There was a relationship between health literacy and some determinants. Positive determinants included age, female gender, Urban background, cognitive maturity, Higher educational qualification, information source (Health workers), number of semesters, and parental education. Some negative determinants were male gender, Rural background, smoking, drinking, being able to pay for medication, lower conspiracy beliefs, and higher fear of COVID-19. Conclusion: University students around the world should have courses about health literacy according to university disciplines. These courses should be available for students of different fields to enhance their effectiveness, and training should be associated with students’ needs and their subgroup traits.