Bibliographic Details
| Title: |
The Functions of Cholera Toxin Subunit B as a Modulator of Silica Nanoparticle Endocytosis. |
| Authors: |
Susnik, Eva1 (AUTHOR) eva.susnik@unifr.ch, Balog, Sandor1 (AUTHOR) sandor.balog@unifr.ch, Taladriz-Blanco, Patricia2 (AUTHOR) patricia.taladriz@inl.int, Petri-Fink, Alke1,3 (AUTHOR) alke.fink@unifr.ch, Rothen-Rutishauser, Barbara1 (AUTHOR) barbara.rothen@unifr.ch |
| Source: |
Toxins. Aug2023, Vol. 15 Issue 8, p482. 16p. |
| Subject Terms: |
*CHOLERA toxin, *NANOPARTICLES, *ENDOCYTOSIS, *CELL physiology, *EPITHELIAL cells |
| Abstract: |
The gastrointestinal tract is the main target of orally ingested nanoparticles (NPs) and at the same time is exposed to noxious substances, such as bacterial components. We investigated the interaction of 59 nm silica (SiO2) NPs with differentiated Caco-2 intestinal epithelial cells in the presence of cholera toxin subunit B (CTxB) and compared the effects to J774A.1 macrophages. CTxB can affect cellular functions and modulate endocytosis via binding to the monosialoganglioside (GM1) receptor, expressed on both cell lines. After stimulating macrophages with CTxB, we observed notable changes in the membrane structure but not in Caco-2 cells, and no secretion of the pro-inflammatory cytokine tumor necrosis factor-α (TNF-α) was detected. Cells were then exposed to 59 nm SiO2 NPs and CtxB sequentially and simultaneously, resulting in a high NP uptake in J774A.1 cells, but no uptake in Caco-2 cells was detected. Flow cytometry analysis revealed that the exposure of J774A.1 cells to CTxB resulted in a significant reduction in the uptake of SiO2 NPs. In contrast, the uptake of NPs by highly selective Caco-2 cells remained unaffected following CTxB exposure. Based on colocalization studies, CTxB and NPs might enter cells via shared endocytic pathways, followed by their sorting into different intracellular compartments. Our findings provide new insights into CTxB's function of modulating SiO2 NP uptake in phagocytic but not in differentiated intestine cells. [ABSTRACT FROM AUTHOR] |
|
Copyright of Toxins is the property of MDPI and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) |
| Database: |
Academic Search Complete |
|
Full text is not displayed to guests. |
Login for full access.
|
