
This work aimed to analyze ACE2 expression in the human brain, focusing on the choroid plexuses. Twenty brain samples were obtained at autopsy from ten human fetuses and ten adult subjects. All samples were selected to contain the choroid plexus. Specimens were fixed in 10% formalin, routinely processed, and paraffin-embedded. The study shows a strong ACE expression in the fetal and adult brain choroid plexuses. This new histopathological finding may clarify the susceptibility of the human brain to SARS-COV-2 infection. The data indicate the choroid plexus as the entry gate of the virus in the human brain; therefore, the entrance of SARS-CoV-2 into the cerebrospinal fluid through the choroid plexuses might represent the mechanism utilized by this coronavirus to cause direct injury to brain cells.
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