Abstract Introduction The evolving COVID-19 pandemic became a hallmark in human history, not only by changing lifestyles, but also by enriching scientific knowledge on viral infection and its consequences. Objective Although the management of cardiorespiratory changes is pivotal to a favorable prognosis during severe clinical findings, dysregulation of other systems caused by SARS-CoV-2 infection may imbalance erythrocyte dynamics, such as a bidirectional positive feedback loop pathophysiology. Method and Results Recent evidence shows that SARS-CoV-2 is capable of affecting the genetics and dynamics of erythrocytes and this coexists with a non-homeostatic function of cardiovascular, respiratory and renal systems during COVID-19. In hypothesis, SARS-CoV-2-induced systematical alterations of erythrocytes dynamics would constitute a setpoint for COVID-19-related multiple organ failure syndrome and death. Conclusion The present review covers the most frequent erythrocyte-related non-homeostatic findings during COVID-19 capable of providing mechanistic clues of SARS-CoV-2-induced infection and inspiring therapeutic-oriented scientific evidence.

RESUMO Memora nodosa, popularmente conhecida como "caroba", é amplamente encontrada em regiões de Cerrado no Brasil. Na Medicina Tradicional, as folhas e as raízes são utilizadas para o tratamento de úlceras externas e as raízes para dores abdominais. O presente trabalho objetivou avaliar o efeito do extrato etanólico das raízes da Memora nodosa (EMN) na mucosa gástrica de camundongos. No modelo de úlcera gástrica induzida por indometacina, o tratamento dos animais com EMN nas doses de 100, 300 e 1000 mg/kg, v.o., foi capaz de reduzir o índice de lesão. Nos modelos de úlcera gástrica induzida por etanol e por estresse o tratamento com EMN na dose de 300 mg/kg foi capaz de proteger a mucosa gástrica em 69 e 43%, respectivamente. Após sete dias de restrição alimentar, os animais tratados com EMN (300 mg/kg v.o.) mostrou uma redução no índice de lesão de 65% quando comparado ao grupo controle. A administração intraduodenal de EMN (300 mg/kg) não alterou os parâmetros de secreção ácida gástrica. O tratamento com EMN (300 mg/kg v.o.) não alterou os níveis de glutationa (GSH), mas foi capaz de aumentar o muco gástrico aderido, quando comparado ao grupo controle lesado. Esses resultados mostram que o EMN possui atividade gastroprotetora provavelmente devido ao aumento de muco gástrico aderido à mucosa gástrica.

ABSTRACT Memora nodosa is popularly known as "caroba" and widely found in the Cerrado regions of Brazil. In traditional medicine, the leaves and stems are used for the healing of external ulcer and the roots for abdominal pain. This study investigated the effect of ethanolic roots extract of Memora nodosa (EMN) on the gastric mucosa of mice. In the indomethacin induced gastric ulcer model, the treatments of the animals with EMN at doses of 100, 300 and 1000 mg/kg, p.o., markedly reduced the index of lesions. In the gastric ulcer models induced by ethanol and cold restraint-stress the previous treatment with EMN at dose of 300 mg/kg showed 69% and 43% of protection, respectively. Seven days after food-restriction, the animals treated with EMN (300 mg/kg p.o.) showed reduction in the index of lesion by 65% as compared to control group. The intraduodenal administration of EMN (300 mg/kg) did not alter the gastric acid secretion parameters. The treatment with EMN (300 mg/kg p.o.) did not alter glutathione levels (GSH), but showed an increase of adhered gastric mucus as compared to the control group with lesion. These results showed that EMN has gastroprotective activity probably due with an increase of adhered gastric mucus.