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We aimed to develop a mechanistic model of the enzymatic restoration effects of a novel therapy based on the administration of different formulations of recombinant human\u2010PBGD (rhPBGD) linked to the ApoAI lipoprotein. This fusion protein circulates in blood, incorporating into HDL and penetrating hepatocytes.<\/jats:p><\/jats:sec><jats:sec><jats:title>Experimental Approach<\/jats:title><jats:p>Single i.v. dose of different formulations of rhPBGD linked to ApoAI were administered to AIP mice in which a porphyric attack was triggered by i.p. phenobarbital. Data consist on 24 h urine excreted amounts of heme precursors, 5\u2010aminolevulinic acid (ALA), PBG and total porphyrins that were analysed using non\u2010linear mixed\u2010effects analysis.<\/jats:p><\/jats:sec><jats:sec><jats:title>Key Results<\/jats:title><jats:p>The mechanistic model successfully characterized over time the amounts excreted in urine of the three heme precursors for different formulations of rhPBGD and unravelled several mechanisms in the heme pathway, such as the regulation in ALA synthesis by heme. Treatment with rhPBGD formulations restored PBGD activity, increasing up to 51 times the value of the rate of tPOR formation estimated from baseline. Model\u2010based simulations showed that several formulation prototypes provided efficient protective effects when administered up to 1\u2009week prior to the occurrence of the AIP attack.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion and Implications<\/jats:title><jats:p>The model developed had excellent performance over a range of doses and formulation type. This mechanistic model warrants use beyond ApoAI\u2010conjugates and represents a useful tool towards more efficient drug treatments of other enzymopenias as well as for acute intermittent porphyria.<\/jats:p><\/jats:sec>","DOI":"10.1111\/bph.15821","type":"journal-article","created":{"date-parts":[[2022,2,16]],"date-time":"2022-02-16T01:33:15Z","timestamp":1644975195000},"page":"3815-3830","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Mechanistic modelling of enzyme\u2010restoration effects of new recombinant liver\u2010targeted proteins in acute intermittent porphyria"],"prefix":"10.1111","volume":"179","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0821-9456","authenticated-orcid":false,"given":"Diego","family":"Vera\u2010Yunca","sequence":"first","affiliation":[{"name":"Pharmacometrics &amp; Systems Pharmacology, Department of Pharmaceutical Technology and Chemistry, School of Pharmacy and Nutrition University of Navarra  Pamplona Spain"},{"name":"IdiSNA, Navarra Institute for Health Research  Pamplona Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Karol M.","family":"C\u00f3rdoba","sequence":"additional","affiliation":[{"name":"IdiSNA, Navarra Institute for Health Research  Pamplona Spain"},{"name":"Hepatology Program, Center for Applied Medical Research (CIMA) University of Navarra  Pamplona Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1503-2710","authenticated-orcid":false,"given":"Zinnia P.","family":"Parra\u2010Guillen","sequence":"additional","affiliation":[{"name":"Pharmacometrics &amp; Systems Pharmacology, Department of Pharmaceutical Technology and Chemistry, School of Pharmacy and Nutrition University of Navarra  Pamplona Spain"},{"name":"IdiSNA, Navarra Institute for Health Research  Pamplona Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Daniel","family":"Jeric\u00f3","sequence":"additional","affiliation":[{"name":"IdiSNA, Navarra Institute for Health Research  Pamplona Spain"},{"name":"Hepatology Program, Center for Applied Medical Research (CIMA) University of Navarra  Pamplona Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Antonio","family":"Fontanellas","sequence":"additional","affiliation":[{"name":"IdiSNA, Navarra Institute for Health Research  Pamplona Spain"},{"name":"Hepatology Program, Center for Applied Medical Research (CIMA) University of Navarra  Pamplona Spain"},{"name":"Centro de Investigaci\u00f3n Biom\u00e9dica en Red de Enfermedades Hep\u00e1ticas y Digestivas (CIBERehd), Instituto de Salud Carlos III  Madrid Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3700-8658","authenticated-orcid":false,"given":"I\u00f1aki F.","family":"Troc\u00f3niz","sequence":"additional","affiliation":[{"name":"Pharmacometrics &amp; Systems Pharmacology, Department of Pharmaceutical Technology and Chemistry, School of Pharmacy and Nutrition University of Navarra  Pamplona Spain"},{"name":"IdiSNA, Navarra Institute for Health Research  Pamplona Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2022,3,21]]},"reference":[{"key":"e_1_2_12_2_1","doi-asserted-by":"publisher","DOI":"10.1111\/bph.15538"},{"key":"e_1_2_12_3_1","doi-asserted-by":"publisher","DOI":"10.1111\/bph.15543"},{"key":"e_1_2_12_4_1","unstructured":"Beal S. 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