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  • Suppressed anti-inflammatory heat shock response in high-risk COVID-19 patients: lessons from basic research (inclusive bats), light on conceivable therapies #MMPMID32749472
  • Heck TG; Ludwig MS; Frizzo MN; Rasia-Filho AA; Homem de Bittencourt PI
  • Clin Sci (Lond) 2020[Aug]; 134 (15): 1991-2017 PMID32749472show ga
  • The major risk factors to fatal outcome in COVID-19 patients, i.e., elderliness and pre-existing metabolic and cardiovascular diseases (CVD), share in common the characteristic of being chronic degenerative diseases of inflammatory nature associated with defective heat shock response (HSR). The molecular components of the HSR, the principal metabolic pathway leading to the physiological resolution of inflammation, is an anti-inflammatory biochemical pathway that involves molecular chaperones of the heat shock protein (HSP) family during homeostasis-threatening stressful situations (e.g., thermal, oxidative and metabolic stresses). The entry of SARS coronaviruses in target cells, on the other hand, aggravates the already-jeopardized HSR of this specific group of patients. In addition, cellular counterattack against virus involves interferon (IFN)-mediated inflammatory responses. Therefore, individuals with impaired HSR cannot resolve virus-induced inflammatory burst physiologically, being susceptible to exacerbated forms of inflammation, which leads to a fatal "cytokine storm". Interestingly, some species of bats that are natural reservoirs of zoonotic viruses, including SARS-CoV-2, possess an IFN-based antiviral inflammatory response perpetually activated but do not show any sign of disease or cytokine storm. This is possible because bats present a constitutive HSR that is by far (hundreds of times) more intense and rapid than that of human, being associated with a high core temperature. Similarly in humans, fever is a physiological inducer of HSR while antipyretics, which block the initial phase of inflammation, impair the resolution phase of inflammation through the HSR. These findings offer a rationale for the reevaluation of patient care and fever reduction in SARS, including COVID-19.
  • |*Heat-Shock Response[MESH]
  • |Animals[MESH]
  • |Betacoronavirus/genetics/*physiology[MESH]
  • |Chiroptera/*immunology/virology[MESH]
  • |Coronavirus Infections/drug therapy/genetics/*immunology/physiopathology[MESH]
  • |Heat-Shock Proteins/genetics/immunology[MESH]
  • |Humans[MESH]
  • |Interferons/immunology[MESH]
  • |Pandemics[MESH]
  • |Pneumonia, Viral/drug therapy/genetics/*immunology/physiopathology[MESH]

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  • suck abstract from ncbi

    1991 15.134 2020