Post-doc - Topical Formulations for The

IRSN is the public expert in nuclear and radiological risk research and assessment. IRSN is a public industrial and commercial establishment (EPIC) whose missions are defined by law n°2015-992 of August 17, 2015 relating to the energy transition for green growth and whose organization and governance are specified in decree n°2016-283 of March 10, 2016. IRSN is placed under the joint supervision of the ministers in charge of ecology, research, energy, health and defense. The post-doctoral position will be led by the Institut Galien Paris-Saclay (IGPS) wich is a major international player in nanomedicine research. Its objective is to develop nanotechnologies to deliver drugs to target cell populations and modulate their effects or for in vitro and in vivo diagnosis. And by the Laboratory of Radiochemistry and Imaging (LRSI) wich is part of the Research Department on the Health and Biological Effects of Ionizing Radiation (SESANE) of the Health Department of IRSN, which develops analytical methods in radiochemistry and conducts research on the speciation and biodistribution of radionuclides from the cellular to the organism level, and then develops medical countermeasures in case of skin or internal contaminations due to radionuclides. The position holder will be hired by IRSN and the research will be performed partly at IGPS in Orsay (91) and at IRSN in Fontenay-aux-Roses (92). Occasional trips in France and abroad are expected. The position is eligible for remote work. **Site web**: **Poste et missions**: **Research project “Topical formulations for the decontamination of injured skin and wounds exposed to radionuclides”** In response to the call for proposals launched by the European Defence Fund, the RESILIENCE Framework Partnership was set up, aiming at building a European collaborative ecosystem against current or future CBRN threats (Chemical, Biological, Radiological, Nuclear). RESILIENCE brings together military medical institutes, research institutes, universities, research and technology organisations (RTOs), hospitals, industries, mid-caps and SMEs. One hundred European partners and their experts in NR (Nuclear, Radiological) threats, will serve different R&D projects, in dosimetry, diagnosis and medical countermeasure. Within this framework, IGPS and IRSN will contribute to the project INDECRAD by developping new decorporating and decontaminating agents to improve care of soldiers exposed to NR threats. Among the complementary approaches to improve radionuclide decontamination, we chose to evaluate the efficacy of topical formulations (i.e., hydrogels and texturing gels) containing chelating drugs such calixarene or hydroxypyridinone (HOPO) to treat injured skin or wounds contaminated with radionuclide such as U, transuranics, Cs or Co. Such pharmaceutical strategy proved to be effective in previous developments to decontaminate skin exposed _ex vivo_ to uranium (Belhomme-Henry et al., 2014; Phan et al., 2013), transuranic elements (Tazrart et al., 2018) or nanomaterials (Tarantini et al., 2024) This project is led by the University of Latvia and has six partners on board: IRSN, CNRS, CEA, the French Ministry of Defense, Bundeswehr Institute of Radiobiology (Germany) and University of Brno (Czech Republic). **Mission** The position holder will contribute to the formulation and physicochemical characterisation of emulsions and hydrogels made of hydrophilic or amphiphilic chelating agents at IGPS, and to the assessment of their effectiveness in decontaminating damaged skin or wounds exposed _ex vivo_ to actinides, cesium, or cobalt isotopes using automated Franz diffusion cells systems, at IRSN. This includes, but is not limited to: - Characterizing the granulometry (in case of dispersed systems), the rheological properties and the stability of the pharmaceutical forms; - Performing _ex vivo_ skin diffusion studies of the radioisotopes (U, Pu, Am, Cs, Co) through murine, porcine or human skins using Franz cells with or without decontamination treatments; - Analyzing the radionuclides in the different compartments and samples using analytical techniques (ICPMS); - Analyzing the results of experiments and writing articles for publication in peerreviewed journals, as well as research reports for internal or external purpose; - Preparing and presenting talks and poster presentations at internal and external seminars and meetings when requested and approved; **References** Beladjine M., Albert C., Sintès M., Mekhloufi G., Gueutin C., Nicolas V., Canette A., Trichet M., Tsapis N., Michel L., Agnely F., Huang N (2023), “Pickering emulsions stabilized with biodegradable nanoparticles for the co-encapsulation of two active pharmaceutical ingredients”, International Journal of Pharmaceutics, 637, 122870. DOI: 10.1016/j.ijpharm.2023.122870 Belhomme-Henry, C., G. Phan, N. Huang, C. Bouvier, F. Rebière, M. Agarande and E. Fattal (2014). "Texturing formulations for uranium skin decontamin