Abstract
Primary infection of SARS-CoV-2 (novel coronavirus or 2019-nCoV), which leads to Covid-19, targets specific cells, such as nasal, bronchial epithelial and pneumocytes, through the viral structural spike (S) protein that binds to the angiotensin-converting enzyme 2 (ACE2) receptor. Also, type 2 transmembrane serine protease (TMPRSS2) present in the host cell promotes viral uptake by cleaving ACE2 and triggering the SARS-CoV-2 S protein, which facilitates SARS-CoV-2 entry into host cells. One of the TMPRSS2 inhibitors with a greater distribution capacity into the lung tissue is bromhexine hydrochloride which attenuates the entry and proliferation of SARS-CoV-2. Bromhexine is an effective drug in the management and treatment of Covid-19 pneumonia via targeting ACE2/ TMPRSS2 pathway. However, prospective and controlled clinical trials are recommended to confirm this observation.
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