Oncolytic effect of SARS-CoV2 in a patient with NK lymphoma.

Covid-19 infection was a possible causal factor in the exhaustion and decrease number of NK clonal cells, resulting in a evident improvement of signs, symptoms and clinical features related to NK lymphoma refractory to previous immuno-chemiotherapy. It has been shown that SARS-CoV2 binds to ACE2. Covid-19 may infect NK cells to suppress their functions, as NK cells express angiotensin converting enzyme 2 (ACE2). The excessive production of proinflammatory cytokines in Covid-19 infection may have played a crucial role in lymphodepletion. Although not published in Covid-19, other RNA viruses that cause acute pulmonary infections promote NK cell apoptosis. In NK/T-cell lymphoma plasma EBV-DNA is a sensitive surrogate biomarker of lymphoma load. In this case, we also notice a dramatic transient reduction in plasmatic EBV-DNA viral copies during Covid-19 pneumonia other than NK clonal cells reduction, and after the infection resolution we described a lymphoma relapse as well as EBV-DNA increase and the rising in NK clonal cells count. Although the mechanism leading to spontaneous remission remain uncharacterized, we hypothezised that a favorable adaptive immunity against concurrent viral infection could render an enhanced anti-tumor effect. We suppose COVID-19 infection have induced a transient remission in this patient affected with NK neoplasm.

Bruxismo nocturno / Sleep bruxism

El bruxismo nocturno es una parafunción caracterizada por contracciones musculares repetidas de la mandíbula. Esto se transforma en una condición patológica cuando el paciente presenta daño dentario. La mayor actividad muscular fue encontrada en el estadio dos del sueño y durante el despertar. El bruxismo es un fenómeno controvertido, pero existe consenso sobre su etiología multifactorial