What does manganese do for the body
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The Role of Manganese in the Human Body
Essential Functions of Manganese
Enzymatic Activity and Metabolism
Manganese (Mn) is a crucial micronutrient that serves as a cofactor for a variety of enzymes involved in essential biological processes. These include macronutrient metabolism, bone formation, and the defense against free radicals 57. Mn is integral to the function of enzymes such as arginase, glutamine synthetase, pyruvate carboxylase, and Mn superoxide dismutase (Mn-SOD), which play roles in development, digestion, reproduction, antioxidant defense, energy production, and immune response 27.
Brain Health and Neurotransmitter Synthesis
Mn is vital for brain health, contributing to the synthesis of neurotransmitters and the clearance of ammonia in the brain . It is transported into the brain via the blood-brain and blood-cerebrospinal fluid barriers, where it binds to metalloproteins like glutamine synthetase in astrocytes. Mn also exists in synaptic vesicles in glutamatergic neurons, influencing synaptic neurotransmission and neural activity . Proper Mn levels are essential for maintaining neuronal physiology and cognitive functions .
Immune System Function
Mn plays a significant role in the immune system by participating in oxidative phosphorylation, glycosylation, and signal transduction. It enhances the immune response in various vertebrates, including humans, by modulating signaling pathways involved in immune processes . Mn is also involved in the host's defense mechanism against pathogens through a process known as nutritional immunity, where the host sequesters Mn to limit its availability to invading pathogens .
Manganese Homeostasis and Toxicity
Homeostatic Mechanisms
Maintaining appropriate Mn levels is critical, as both deficiency and excess can lead to health issues. The body regulates Mn through absorption, transport, and excretion mechanisms. Mn is absorbed in the gut, transported across the blood-brain barrier, and excreted via the biliary system 23. Cellular uptake and efflux mechanisms, including specific Mn transporters, help buffer cellular Mn levels to prevent toxicity .
Neurotoxicity and Manganism
Excessive Mn exposure, often from environmental sources like industrial occupation or contaminated water, can lead to neurotoxicity. This condition, known as manganism, presents with symptoms similar to Parkinson's disease, including motor and cognitive deficits 36. Chronic Mn exposure can result in the accumulation of Mn in the brain, particularly in the basal ganglia, leading to dopaminergic neuronal death and neurochemical dysfunction 810. The neurotoxic effects of Mn are associated with oxidative stress, mitochondrial dysfunction, protein misfolding, and disruption of other metal homeostasis .
Conclusion
Manganese is an essential micronutrient with diverse roles in enzymatic activity, brain health, and immune function. However, maintaining a balance is crucial, as both deficiency and excess can lead to significant health issues, particularly neurotoxicity. Understanding the mechanisms of Mn homeostasis and its impact on human health is vital for developing strategies to mitigate the risks associated with Mn exposure.
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