Morphine and cocaine mediated changes in expression of various tight junction proteins leads to altered blood-brain barrier permeability, thereby facilitating virus entry into the brain [16], [17].
The function of clathrin in facilitating virus entry into host cells has been well documented and, by disrupting clathrin, viral entry was interrupted [ 36, 49, 56– 58].
The genes encode proteins that facilitate virus entry into human cells, and one that mediates cell aggregation, which allows the virus to spread between cells.
The HIV-1 envelope (Env) trimer is a target for vaccine design as well as a conformational machine that facilitates virus entry by transitioning between prefusion-closed, CD4-bound, and coreceptor-bound conformations by transitioning into a postfusion state.
The substitution of W400G and W394G/W400G blocked the ability of the mutant SU to facilitate virus entry into Gfox cells, while mutant W400Y could enter the cells.
Introduction of alanine at S392 had no effect, but the same substitution at S393 or W394 (or the triplet S392/S393/W394) partially abrogated the ability of the mutant SU to facilitate virus entry into Gfox cells (entry ratios between 35% 60%, compared with wild type, Figure 6).
However, a recent study found that although a VZV mutant with a deletion in the IDE binding domain of gE showed reduced cell-to-cell spread of virus in melanoma cells and impaired infectivity of skin xenografts in vivo, it was not defective in infecting T cells [8], suggesting that IDE may facilitate virus entry in a cell-type dependent manner, similar to gp42 of Epstein-Barr virus [25].
In addition, the PK15Sn-CD163 cells also express Sn, which is important to facilitate virus entry.
In functioning as an ion channel, p7 modulates membrane permeability to facilitate virus entry by promoting virus uncoating and to enhance assembly or release.
Whether the cholesterol transport function of NPC1 receptors is required for infectivity is unclear, but these results suggest that the NPC1 receptors can facilitate virus entry in a cholesterol-dependent and -independent fashion.
Two other upregulated miRNAs, pol-miR-221-5p and pol-miR-221-3p pol-miR-221-3p pol-miR-221-3p pol-miR-221-3ppase C. In humans, phospholipase C is a key enzyme that hydrolyzes phosphatidylinositol 4,5-bisphosphate to trigger calcium release from intracellular stores, wereh facilitates virus entry into host cells [ 61, 62].
