Ed widespread interest for drug delivery systems. Herein, folic acid (FA) and 5-carboxylic acid fluorescein (5-FAM) were made use of to modify Fe-MIL-101 to construct a functionalized nano-platform (5-FAM/FA/[email protected]) for the targeted delivery of the anti-tumor drug triptolide and understand in vivo fluorescence imaging. Compared with Fe-MIL-101, functionalized nanoparticles not only showed better targeted therapy efficiency, but in addition lowered the systemic toxicity of triptolide. Additionally, the modification of 5-FAM facilitated fluorescence imaging in the tumor web-site and realized the construction of an integrated nanoplatform for fluorescence imaging and therapy. Both in vitro and in vivo research of functionalized nanoparticles have demonstrated Alkannin Ras excellent fluorescence imaging and synergistic targeting anticancer activity with negligible systemic toxicity. The development of functional nano-platform provides new concepts for the design and style of MOF-based multifunctional nano-drug delivery system, which can be utilised for precise treatment of tumor. Keywords and phrases: MOFs; targeting drug delivery; cancer; controlled releaseReceived: eight October 2021 Accepted: 15 November 2021 Published: 17 NovemberPublisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations.1. Introduction At present, most chemotherapeutic drugs happen to be established to have good anti-tumor effects, but their uneven distribution within the physique and negative effects on normal tissues and organs generally impact their clinical applications . For the duration of treatment, an increase in dose is applied to resolve the issue of biodistribution, however it can cause dose-related unwanted side effects . Consequently, there’s an urgent need for any targeted drug delivery system with biocompatibility to overcome the above-mentioned troubles . The rapid improvement of nanotechnology provides an opportunity to overcome challenges faced by the biomedical field. As a multifunctional porous nanomaterial, metal rganic frameworks (MOFs) have received in depth attention in a variety of fields because they have been proposed . They have been extensively applied in gas storage, adsorption, catalysis, sensing, biological imaging, energy storage, and drug delivery . The adjustable structure of MOFs can obtain targeted drug delivery, that is currently a study hotspot inside the field of biomedicine . Zhang et al. utilized a folate-modified MOF as a carrier of photosensitizers to achieve precise tumor treatment . Vandana et al. synthesized MIL-101-Fe with a solvothermalCopyright: 2021 by the authors. Licensee MDPI, Basel, Switzerland. This short article is an open access report distributed under the terms and conditions of your Creative Commons Attribution (CC BY) license (https:// creativecommons.org/licenses/by/ 4.0/).Pharmaceutics 2021, 13, 1945. https://doi.org/10.3390/pharmaceuticshttps://www.mdpi.com/journal/pharmaceuticsPharmaceutics 2021, 13,2 ofmethod and accomplished drug coupling via amino groups. The nanoparticles were proven to possess an excellent drug release profile . Gao et al. modified ZIF-8 with folic acid and 5-FAM to target the delivery of 5-FU. This nano-platform exhibited targeted drug delivery, affecting tracking and regional slow-release 9-PAHSA-d9 Technical Information functions . Among MOFs, iron-based MOFs have already been studied extensively as a consequence of their fantastic properties and chemical versatility . Folic acid (FA) receptors are highly expressed in tumor tissues; therefore, metal rganic frameworks modified by f.