PMID- 34990742 OWN - NLM STAT- MEDLINE DCOM- 20220208 LR - 20220208 IS - 1873-3476 (Electronic) IS - 0378-5173 (Linking) VI - 614 DP - 2022 Feb 25 TI - Skin interaction, permeation, and toxicity of silica nanoparticles: Challenges and recent therapeutic and cosmetic advances. PG - 121439 LID - S0378-5173(21)01245-X [pii] LID - 10.1016/j.ijpharm.2021.121439 [doi] AB - Silica nanoparticles (SNPs) received more attention with the emergence of nanotechnology with the aim and promise of becoming innovative drug delivery systems. They have been fulfilling this objective with excellence and nowadays they play a central role in biomedical applications. New SNPs application routes are being explored such as the epidermal, dermal, and transdermal routes. With that, novel models of synthesis, functionalization, and applications constantly appear. However, it is essential that such innovations are accompanied by in-depth studies on permeation, biodistribution, metabolization, and elimination of the generated by-products. Such studies are still incipient, if not rare. This article reviews significant findings on SNPs and their skin interactions. An extensive literature review on SNPs synthesis and functionalization methodologies was performed, as well as on the skin characteristics, skin permeation mechanisms, and in vivo toxicity assessments. Furthermore, studies of the past 5 years on the main therapeutic and cosmetic products employing SNPs, with greater emphasis on in vivo and ex vivo studies were included. CI - Copyright (c) 2021 Elsevier B.V. All rights reserved. FAU - Morais, Renata Pinho AU - Morais RP AD - Department of Mechanical Engineering, Universidade Federal do Parana, Curitiba, Brazil. Electronic address: renata.morais@ufpr.br. FAU - Hochheim, Sabrina AU - Hochheim S AD - Department of Chemistry, Universidade Federal do Parana, Curitiba, Brazil. Electronic address: sabrina.hochheim@ufpr.br. FAU - de Oliveira, Carolina C AU - de Oliveira CC AD - Department of Cell Biology, Universidade Federal do Parana, Curitiba, Brazil. Electronic address: krokoli@ufpr.br. FAU - Riegel-Vidotti, Izabel C AU - Riegel-Vidotti IC AD - Department of Chemistry, Universidade Federal do Parana, Curitiba, Brazil. Electronic address: izabel.riegel@ufpr.br. FAU - Marino, Claudia E B AU - Marino CEB AD - Department of Mechanical Engineering, Universidade Federal do Parana, Curitiba, Brazil. Electronic address: claudiamarino@ufpr.br. LA - eng PT - Journal Article PT - Review DEP - 20220103 PL - Netherlands TA - Int J Pharm JT - International journal of pharmaceutics JID - 7804127 RN - 7631-86-9 (Silicon Dioxide) SB - IM MH - Administration, Cutaneous MH - Drug Delivery Systems MH - *Nanoparticles/toxicity MH - *Silicon Dioxide/metabolism/toxicity MH - Skin/metabolism MH - Tissue Distribution OTO - NOTNLM OT - Silica nanoparticles OT - Skin permeation OT - Skin toxicity OT - Topical drug delivery OT - Topical formulations EDAT- 2022/01/07 06:00 MHDA- 2022/02/09 06:00 CRDT- 2022/01/06 20:14 PHST- 2021/09/23 00:00 [received] PHST- 2021/12/16 00:00 [revised] PHST- 2021/12/28 00:00 [accepted] PHST- 2022/01/07 06:00 [pubmed] PHST- 2022/02/09 06:00 [medline] PHST- 2022/01/06 20:14 [entrez] AID - S0378-5173(21)01245-X [pii] AID - 10.1016/j.ijpharm.2021.121439 [doi] PST - ppublish SO - Int J Pharm. 2022 Feb 25;614:121439. doi: 10.1016/j.ijpharm.2021.121439. Epub 2022 Jan 3.