Therefore, like mammalian β-arrestin, lamprey β-arrestin may not only terminate parapinopsin signaling but may also promote the clathrin-mediated internalization of light-stimulated parapinopsin.
This animal model showed internalization of the light chains utilizing caveolae followed by trafficking to the mature lysosomal compartment where fibrils were formed.
The internalization of this "field Negro/house Negro" mentality and valorization of light skin tones continues to systematically affect the lives of African Americans and greater society in both overt and covert ways.
Interestingly, although invertebrate-type arrestins do not contain a clathrin-binding domain, they have been implicated in the light-induced clathrin-mediated internalization of visual pigments [22] [24] through the interaction with another adaptor protein, AP-2 [25].
Furthermore, the internalization of PEI/pDNA complexes in hMSCs was enhanced by light irradiation even under conditions that inhibited endocytosis.
Because beta-arrestin, which is a mediator of clathrin-mediated GPCR internalization, also served as a mediator of parapinopsin internalization in cultured cells, these results suggest that the granules were generated light-dependently by beta-arrestin-mediated internalization of parapinopsins from the outer segments.
Like mammalian β-arrestin, which serves as a mediator of clathrin-dependent GPCR internalization [13] [15], lamprey β-arrestin may modulate the internalization of parapinopsin in HEK 293S cells in a clathrin- and light-dependent manner (Figures 3 and S5).
Apoptotic cells can be identified by their characteristic light scattering properties (see Figure 4, below), so that internalization of phospholipid by just those cells can be measured using flow cytometry.
Similarly to optical transfection methods, using laser light alone can perforate a cell membrane and allow internalization of nucleic acids.
An alternative approach used to quantify the internalization of particles that are smaller than the classical optical resolution limit using light microscopy was presented by Torrano et al. [ 59].
Therefore, it can be speculated that the arrestin-mediated internalization of non-bleaching pigments is a general strategy for completely eliminating the light-activated pigment from the signaling cascades to restore photoreceptor cell conditions to the original dark state.
