The Influence of Heavy Metals and Trace Elements on Comatose Patients with Severe Traumatic Brain Injury in the First Week of Admission

Atox1 protects hippocampal neurons after traumatic brain injury via DJ-1 mediated anti-oxidative stress and mitophagy

Regulation of the oxidative stress response is crucial for the management and prognosis of traumatic brain injury (TBI). The copper chaperone Antioxidant 1 (Atox1) plays a crucial role in regulating intracellular copper ion balance and impacting the antioxidant capacity of mitochondria, as well as the oxidative stress state of cells. However, it remains unknown whether Atox1 is involved in modulating oxidative stress following TBI. Here, we investigated the regulatory role of Atox1 in oxidative stress on neurons both in vivo and in vitro, and elucidated the underlying mechanism through culturing hippocampal HT-22 cells with Atox1 mutation. The expression of Atox1 was significantly diminished following TBI, while mice with overexpressed Atox1 exhibited a more preserved hippocampal structure and reduced levels of oxidative stress post-TBI. Furthermore, the mice displayed notable impairments in learning and memory functions after TBI, which were ameliorated by the overexpression of Atox1. In the stretch injury model of HT-22 cells, overexpression of Atox1 mitigated oxidative stress by preserving the normal morphology and network connectivity of mitochondria, as well as facilitating the elimination of damaged mitochondria. Mechanistically, co-immunoprecipitation and mass spectrometry revealed the binding of Atox1 to DJ-1. Knockdown of DJ-1 in HT-22 cells significantly impaired the antioxidant capacity of Atox1. Mutations in the copper-binding motif or sequestration of free copper led to a substantial decrease in the interaction between Atox1 and DJ-1, with overexpression of DJ-1 failing to restore the antioxidant capacity of Atox1 mutants. The findings suggest that DJ-1 mediates the ability of Atox1 to withstand oxidative stress. And targeting Atox1 could be a potential therapeutic approach for addressing post-traumatic neurological dysfunction.

Characterizing the progress in traumatic brain injuries research in North Africa: a systematic review

Traumatic brain injury (TBI) represents a major health concern worldwide. Currently, systematic TBI studies in North Africa are lacking. Nevertheless, they are highly needed to ameliorate TBI outcomes and increase survival rates among TBI patients. Through this systematic review, we aimed to characterize the progress in TBI research in North Africa and analyse the literature on TBI in the region in the last two decades. A review of North African articles was performed over 22 years (2000-2021) and the required data were collected using keywords: "traumatic brain injury", "traumatic brain damage", "traumatic head injury", and "traumatic head damage". Abstracts were screened, and selected eligible studies were reviewed independently by two reviewers. The review included 22 studies within the 59,204, 63,083, and 45,918 records that were identified between 2000 and 2021 through Scopus, Web of Science, and PubMed, respectively. The proportion of the total global TBI records that relate to North Africa was less than 1%. Overall, the indices show low progress in the number of new records occurring every year in North Africa and all the records in North Africa were produced after the year 2004. The results show that North Africa has witnessed a low production in TBI research, and the progress is far from being equal to other regions. Production of scientific publications, providing the required information and raising awareness about complications resulting from TBI on individuals and society in general, should be considered.

Morphine-element interactions - The influence of selected chemical elements on neural pathways associated with addiction

Addiction is a pressing social problem worldwide and opioid dependence can be considered the strongest and most difficult addiction to treat. Mesolimbic and mesocortical dopaminergic pathways play an important role in modulation of cognitive processes and decision making and, therefore, changes in dopamine metabolism are considered the central basis for the development of dependence. Disturbances caused by excesses or deficiency of certain elements have a significant impact on the functioning of the central nervous system (CNS) both in physiological conditions and in pathology and can affect the cerebral reward system and therefore, may modulate processes associated with the development of addiction. In this paper we review the mechanisms of interactions between morphine and zinc, manganese, chromium, cadmium, lead, fluoride, their impact on neural pathways associated with addiction, and on antinociception and morphine tolerance and dependence.