Endogenous mucosal phosphatases characterization in duodenum brush border membrane of laying hens

dc.contributor.authorHanauska, Anna
dc.contributor.authorSommerfeld, Vera
dc.contributor.authorSchollenberger, Margit
dc.contributor.authorHuber, Korinna
dc.contributor.authorRodehutscord, Markus
dc.date.accessioned2025-06-04T13:33:31Z
dc.date.available2025-06-04T13:33:31Z
dc.date.issued2025
dc.date.updated2025-05-13T11:19:08Z
dc.description.abstractChicken mucosal phosphatases can partially degrade phytate contained in the feed. Little is known about the characteristics and degradation products of such mucosal phosphatases and the effects of age and genetic strain of the chicken. The objective of this study was to characterize endogenous mucosal phosphatases of two laying hen strains fed diets with or without mineral phosphorus (P) before and after the onset of egg laying. Hens of the strains Lohmann Brown-classic (LB) and Lohmann LSL-classic (LSL) were sacrificed in weeks 19 and 24 of age after 4 weeks of feeding one of two diets with (P+) or without (P-) mineral P supplement. Mucosa of the duodenum was collected, and the brush border membrane (BBM) of enterocytes was enriched and used for phosphatase activity determination. Additionally, the BBM was used in a modified three-step in vitro assay to study the InsP6 degradation products. The results of both in vitro assays were not significantly affected by hen strain and diet. The activity of mucosal phosphatase in 19-week-old hens was, on average, 0.8 µmol Pi/g BBM protein/min lower than in 24-week-old hens (P < 0.002). Consistently, the InsP6 concentration in the incubation residue was significantly higher in 19-week-old hens than in 24-week-old hens (P < 0.001). In the incubation residue, the concentrations of Ins(1,2,3,4,5)P5, Ins(1,2,3,4,6)P5, and Ins(1,2,3,4)P4 were significantly lower (P ≤ 0.002), and those of InsP3 and InsP2 were significantly higher (P ≤ 0.027) when BBM of 24-week-old hens was used compared to 19-week-old hens. The InsP6 degradation products suggest the activity primarily of a 6- and secondarily of a 5-phytase in the duodenal mucosa. The consistent results from both in vitro assays provide a comprehensive characterization of these enzymes. Under the conditions of this study, small intestine calcium concentration appeared to influence mucosal enzyme activity more than dietary mineral P supplementation.
dc.identifier.urihttps://doi.org/10.3389/fphys.2025.1581088
dc.identifier.urihttps://hohpublica.uni-hohenheim.de/handle/123456789/17668
dc.language.isoeng
dc.rights.licensecc_by
dc.subjectAge
dc.subjectBrush border membrane
dc.subjectGenetic strain
dc.subjectin vitro assay
dc.subjectLaying hen
dc.subjectMucosal phosphatase
dc.subjectPhosphorus
dc.subjectPhytate degradation
dc.subject.ddc630
dc.titleEndogenous mucosal phosphatases characterization in duodenum brush border membrane of laying hens
dc.type.diniArticle
dcterms.bibliographicCitationFrontiers in physiology, 16 (2025), 1581088. https://doi.org/10.3389/fphys.2025.1581088. ISSN: 1664-042X
dcterms.bibliographicCitation.articlenumber1581088
dcterms.bibliographicCitation.issn1664-042X
dcterms.bibliographicCitation.journaltitleFrontiers in physiology
dcterms.bibliographicCitation.originalpublishernameFrontiers Media S.A.
dcterms.bibliographicCitation.volume16
local.export.bibtex@article{Hanauska2025, doi = {10.3389/fphys.2025.1581088}, author = {Hanauska, Anna and Sommerfeld, Vera and Schollenberger, Margit et al.}, title = {Endogenous mucosal phosphatases characterization in duodenum brush border membrane of laying hens}, journal = {Frontiers in Physiology}, year = {2025}, volume = {16}, }
local.export.bibtexAuthorHanauska, Anna and Sommerfeld, Vera and Schollenberger, Margit et al.
local.export.bibtexKeyHanauska2025
local.export.bibtexType@article
local.title.fullEndogenous mucosal phosphatases characterization in duodenum brush border membrane of laying hens

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