Hives pathophysiology
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Mast Cell and Basophil Activation in Hives Pathophysiology
Hives, or urticaria, are primarily caused by the activation of mast cells and basophils in the skin. When these cells are triggered, they release histamine and other proinflammatory mediators, leading to the characteristic itchy, raised, and red wheals seen in hives. This process is central to both acute and chronic forms of urticaria, regardless of the underlying cause Bracken2019Rauber2017Guo2019+2 MORE.
Immune and Autoimmune Mechanisms in Chronic Urticaria
In chronic spontaneous urticaria (CSU), which lasts more than six weeks, immune system dysfunction plays a significant role. Up to 50% of CSU cases are thought to have an autoimmune basis, where the body produces autoantibodies against components of mast cells or basophils, such as the high-affinity IgE receptor (FcεRI) or IgE itself. These autoantibodies can directly activate these cells, causing the release of histamine and other mediators. There is also a notable association between chronic urticaria and autoimmune thyroid disease, with many patients showing antithyroid antibodies Bracken2019Rauber2017Guo2019+2 MORE.
Non-Immune Triggers and Idiopathic Cases
Acute urticaria, which lasts less than six weeks, is often triggered by infections, medications, or foods, but in more than half of cases, no clear cause is found. Similarly, most cases of chronic urticaria are considered idiopathic, meaning no specific trigger or underlying disease is identified. Non-immune mechanisms, such as direct activation of mast cells by drugs or physical stimuli, can also contribute to hive formation Muñoz-Estrada2024Guo2019Schocket2006+1 MORE.
Subtypes and Special Forms: Cholinergic Urticaria
Cholinergic urticaria is a special form triggered by increased body temperature, such as during exercise or bathing. In this condition, acetylcholine plays a key role, and patients may show hypersensitivity to their own sweat or have positive autologous serum skin tests. Two subtypes have been described: one with sweat hypersensitivity and another with follicular involvement, each with distinct mechanisms of hive formation .
Gut-Skin Axis and Microbiome Influence
Emerging research suggests that the gut microbiome may influence the development of chronic urticaria. Patients with chronic urticaria often have reduced levels of beneficial gut bacteria and increased levels of Proteobacteria, which may disrupt the gut barrier and promote inflammation. This gut-skin connection is a new area of interest for understanding and potentially treating hives .
Neuro-Immuno-Psychological Factors
Psychological stress is recognized as both a trigger and a modulator of chronic urticaria. Stress can influence immune responses and mast cell activation through neuroimmune pathways, involving neuropeptides and neurotransmitters. Addressing psychological factors is increasingly seen as important in managing chronic urticaria alongside traditional medical treatments .
Conclusion
The pathophysiology of hives involves complex interactions between immune, autoimmune, non-immune, microbial, and psychological factors. Central to all forms is the activation of mast cells and basophils, leading to the release of histamine and other mediators that cause the typical symptoms. While many cases remain idiopathic, advances in understanding autoimmune mechanisms, the gut-skin axis, and neuroimmune interactions are opening new avenues for diagnosis and treatment.
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HIV enteropathy (HIVE) and Slim disease (SD): historical and current perspectives.
HIV enteropathy (HIVE) and slim disease (SD) are related, with HIVE affecting the gut mucosa and SD affecting the intestinal epithelial proliferation, and antiretroviral therapy playing a role in both conditions.
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