Air pollution is a real public health problem, it being one of the five most common causes of mortality in developing countries. However, pollution studies have focused on the cardiovascular and pulmonary systems in recent decades. Recently, researchers have moved towards a new direction, tracing a direct link between pollution and stroke. Stroke has many known risk factors such as smoking, a sedentary lifestyle, and hypertension. Pollution is universally widespread, already a matter of public interest, so that, although intuitive, it is difficult to connect the two. The particles found in the air that we breathe, regardless of their origin, can attack the body in different ways, causing inflammation, and triggering a true cascade of phenomena that end up attacking the central nervous system and other organs. This article tries to explain the series of phenomena that determine the harmful effect of particles present in the air, with an increased focus on the central nervous system and especially on strokes. A deeper understanding of these phenomena helps in guiding future studies and finding viable solutions to protect people at risk.

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Background and aims. Multiple sclerosis is a disease of the central nervous system, whose treatment often involves the use of monoclonal antibodies. This can lead to a series of complications that the clinician should pay attention to and accordingly adjust the therapy. We aim to emphasize real-life experiences with adverse cutaneous reactions to monoclonal antibodies by presenting a series of two cases from our clinic. Methods. In the first case, a female patient was treated with natalizumab for eight years and developed relapsing-remitting cutaneous lesions following the monthly administration of the treatment. The second case is of a male patient treated with ocrelizumab, who developed plaque-like lesions following the fifth administration. We analyzed the biological parameters and performed investigations, dermatological evaluation and skin biopsies. Results. The result of the skin biopsy for the natalizumab patient showed a chronic spongiotic dermatitis, with the anti-natalizumab antibodies being negative. The patient who received ocrelizumab developed nummular eczema, disseminated on his trunk and limbs. Conclusions. Given the fact that these therapies are frequently used in multiple sclerosis patients, and their skin adverse reactions are known, we described some particularities and a brief review of the literature with practical implications. Further studies need to be conducted to establish a firm association between monoclonal antibodies therapy and adverse cutaneous reactions, but the clinician should be aware of their existence.

Cannabinoids' usefulness in the treatment of neurological disorders (epilepsy, and various neurodegenerative diseases, such as Multiple Sclerosis and Alzheimer's Disease) has been demonstrated in a growing number of studies. Of the 11 known general types of natural cannabinoids, the focus has been mainly directed at cannabidiol (CBD) due to its specificity in stimulating cannabinoid receptors and the low rate of side effects, as well as on Δ (9)-tetrahydrocannabinol (Δ9-THC). The natural and synthetic analogs of CBD have been described as a potential treatment in neurological diseases, as they showed their therapeutic benefits in reducing the seizures from epilepsy and their neuroprotectivity in neurodegenerative diseases. First and foremost, CBD's neuroprotective properties are due to its capacity to act as an endogenous cannabinoid receptor agonist. Second, CBD enhances neuroprotection by interacting with many signal transduction pathways mediated indirectly through cannabinoid receptors. CBD also reduces the hyperphosphorylation of glycogen synthetase kinase 3 (GSK-3) induced by the buildup of Amyloid β in the physiopathology of Alzheimer's disease.