{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"institution":[{"name":"bioRxiv"}],"indexed":{"date-parts":[[2026,1,15]],"date-time":"2026-01-15T19:48:58Z","timestamp":1768506538732,"version":"3.49.0"},"posted":{"date-parts":[[2023,6,15]]},"group-title":"Molecular Biology","reference-count":45,"publisher":"openRxiv","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"accepted":{"date-parts":[[2023,6,15]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                <jats:sec>\n                  <jats:title>Background and aims<\/jats:title>\n                  <jats:p>\n                    Progressive familiar intrahepatic cholestasis type 3 (PFIC3) is a severe rare liver disease which affects between 1\/50,000 to 1\/100,000 children. In physiological conditions, bile is produced by the liver and stored in the gallbladder, then it flows to the small intestine to play its role in fat digestion. To prevent tissue damage, bile acids are kept into phospholipid micelles. Mutations in phosphatidyl choline transporter ABCB4 (\n                    <jats:italic>MDR3<\/jats:italic>\n                    ) lead to intrahepatic accumulation of free bile acids that results in liver damage. PFIC3 onset occurs usually at early ages, progress rapidly and the prognosis is poor. Currently, besides the palliative use of ursodeoxycholate, the only available treatment for this disease is liver transplantation, which is really challenging for short-aged patients.\n                  <\/jats:p>\n                <\/jats:sec>\n                <jats:sec>\n                  <jats:title>Methods<\/jats:title>\n                  <jats:p>To gain insight into the pathogenesis of PFIC3 we have performed an integrated proteomics and phosphoproteomics study in human liver samples to then validate the emerging functional hypotheses in a PFIC3 murine model.<\/jats:p>\n                <\/jats:sec>\n                <jats:sec>\n                  <jats:title>Results<\/jats:title>\n                  <jats:p>We identified 6,246 protein groups, 324 proteins among them showing differential expression between control and PFIC3. The phosphoproteomic analysis allowed the identification of 5,090 phosphopeptides, from which 215 corresponding to 157 protein groups, were differentially phosphorylated in PFIC3, including MDR3. Regulation of essential cellular processes and structures, such as inflammation, metabolic reprograming, cytoskeleton and extracellular matrix remodeling and cell proliferation were identified as main drivers of the disease.<\/jats:p>\n                <\/jats:sec>\n                <jats:sec>\n                  <jats:title>Conclusion<\/jats:title>\n                  <jats:p>Our results provide a strong molecular background that significantly contributes to a better understanding of PFIC3 and provides new concepts that might prove useful in the clinical management of patients.<\/jats:p>\n                <\/jats:sec>\n                <jats:sec>\n                  <jats:title>Lay Summary\/Key Points<\/jats:title>\n                  <jats:p>PFIC3 is a rare disease that affect 1\/50,000 to 1\/100,000 children that present severe symptoms in the first years of life and have scarce therapeutic options. We identified a panel of proteins that recapitulate some of the main cellular processes associated to the progression of liver injury in PFIC3 patients and suggest alternative treatment options.<\/jats:p>\n                <\/jats:sec>","DOI":"10.1101\/2023.06.15.545058","type":"posted-content","created":{"date-parts":[[2023,6,15]],"date-time":"2023-06-15T12:45:24Z","timestamp":1686833124000},"source":"Crossref","is-referenced-by-count":0,"title":["Molecular basis of Progressive Familial Intrahepatic Cholestasis 3. 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