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Deprecated: Implicit conversion from float 209.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Endocr+Res 2020 ; 45 (3): 210-215 Nephropedia Template TP
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Coronaviruses and Integrin alphavbeta3: Does Thyroid Hormone Modify the Relationship? #MMPMID32628899
Davis PJ; Lin HY; Hercbergs A; Keating KA; Mousa SA
Endocr Res 2020[Aug]; 45 (3): 210-215 PMID32628899show ga
BACKGROUND: Uptake of coronaviruses by target cells involves binding of the virus by cell ectoenzymes. For the etiologic agent of COVID-19 (SARS-CoV-2), a receptor has been identified as angiotensin-converting enzyme-2 (ACE2). Recently it has been suggested that plasma membrane integrins may be involved in the internalization and replication of clinically important coronaviruses. For example, integrin alphavbeta3 is involved in the cell uptake of a model porcine enteric alpha-coronavirus that causes human epidemics. ACE2 modulates the intracellular signaling generated by integrins. OBJECTIVE: We propose that the cellular internalization of alphavbeta3 applies to uptake of coronaviruses bound to the integrin, and we evaluate the possibility that clinical host T4 may contribute to target cell uptake of coronavirus and to the consequence of cell uptake of the virus. DISCUSSION AND CONCLUSIONS: The viral binding domain of the integrin is near the Arg-Gly-Asp (RGD) peptide-binding site and RGD molecules can affect virus binding. In this same locale on integrin alphavbeta3 is the receptor for thyroid hormone analogues, particularly, L-thyroxine (T4). By binding to the integrin, T4 has been shown to modulate the affinity of the integrin for other proteins, to control internalization of alphavbeta3 and to regulate the expression of a panel of cytokine genes, some of which are components of the 'cytokine storm' of viral infections. If T4 does influence coronavirus uptake by target cells, other thyroid hormone analogues, such as deaminated T4 and deaminated 3,5,3'-triiodo-L-thyronine (T3), are candidate agents to block the virus-relevant actions of T4 at integrin alphavbeta3 and possibly restrict virus uptake.
Endocr+Res 2020 ; 45 (3): 210-215
