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A commercially available diet was enriched with varying amount of SF: 0, 50 and 100\u2009mg\u2009kg<jats:sup>\u22121<\/jats:sup> (representing the control, SF50 and SF100 diets\u00a0respectively). The animals were fed for 30 days and half of them were sampled. Similar experimental wounds were then performed on the rest of fish, and they continued to be fed the same diet. At 7 days post\u2010wounding, samples were taken from the wounded fish. Cellular immunity was studied on head kidney leucocytes (phagocytosis, respiratory and peroxidase content) and liver status (histological study and gene expression) were studied. Our results showed that experimental wounds affect both cellular immunity (by decreasing leucocyte respiratory burst and peroxidase activity) and altered liver histology (by inducing vascularisation and congestion of blood vessels). In addition, it influences the expression of genes that serve as markers of oxidative stress, endoplasmic reticulum stress and apoptosis. The highest dose of SF (SF100) increased the phagocytic capacity of leucocytes the most, as well as the expression of genes related to blood vessel formation in the liver. Furthermore, increased expression of antioxidant genes (<jats:italic>cat<\/jats:italic> and <jats:italic>gsr<\/jats:italic>) and decreased expression of genes related to reticulum endoplasmic stress (<jats:italic>grp94<\/jats:italic> and <jats:italic>grp170<\/jats:italic>) and apoptosis (<jats:italic>nos<\/jats:italic> and <jats:italic>jnk<\/jats:italic>) were detected in these fish fed with SF100 and wounded. In conclusion, fed fish with SF100 had many beneficial effects as cellular immunostimulant and hepatoprotection in wounded fish. Its use could be of great interest for stress management in farmed fish conditions.<\/jats:p>","DOI":"10.1111\/jpn.13950","type":"journal-article","created":{"date-parts":[[2024,3,14]],"date-time":"2024-03-14T12:59:56Z","timestamp":1710421196000},"page":"1046-1058","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Effect of silk fibroin microparticles on cellular immunity and liver of gilthead seabream (<i>Sparus aurata<\/i> L.) with and without experimental skin injuries"],"prefix":"10.1111","volume":"108","author":[{"given":"N.","family":"Albaladejo\u2010Riad","sequence":"first","affiliation":[{"name":"Immunobiology for Aquaculture Group, Department of Cell Biology and Histology, Faculty of Biology, Campus of International Excellence, Campus Mare Nostrum University of Murcia Murcia 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