HPLC‐ESI‐MS analysis of oral human fluids reveals that gingival crevicular fluid is the main source of oral thymosins β4 and β10 |
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Authors: | Rosanna Inzitari Tiziana Cabras Elisabetta Pisano Chiara Fanali Barbara Manconi Emanuele Scarano Antonella Fiorita Gaetano Paludetti Armando Manni Sonia Nemolato Gavino Faa Massimo Castagnola Irene Messana |
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Institution: | 1. Istituto di Biochimica e di Biochimica Clinica, Università Cattolica and Istituto per la Chimica del Riconoscimento Molecolare, CNR, Istituto Scientifico Internazionale (ISI) Paolo VI, Roma, Italy;2. Dipartimento di Scienze Applicate ai Biosistemi, Università di Cagliari, Cagliari, Italy. Fax: +39‐070‐675‐4522;3. Dipartimento di Chirurgia e Scienze Odontostomatologiche, Università di Cagliari, Cagliari, Italy;4. Istituto di Clinica Otorinolaringoiatrica, Università Cattolica, Roma, Italy;5. Istituto di Clinica Odontoiatrica, Università Cattolica, Roma, Italy;6. Dipartimento di Citomorfologia, Università di Cagliari, Cagliari, Italy |
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Abstract: | Thymosin β4 (Tβ4), its sulfoxide, and thymosin β10 (Tβ10) were detected in human saliva and identified by different strategies based on RP HPLC coupled to electrospray multidimensional IT MS. Tβ4 was almost always detected in whole saliva, its sulfoxide sporadically, Tβ10 rarely. Tβ4 was undetectable in parotid saliva and less concentrated in submandibular/sublingual saliva than in whole saliva. Analysis of gingival crevicular fluid revealed high relative amounts of Tβ4, Tβ4 sulfoxide, and Tβ10 in all the samples. Tβ4 mean concentration was 200 times higher in crevicular fluid (20 μmol/L, N = 9) than in whole saliva (0.1 μmol/L, N = 9). Crevicular fluid concentration of Tβ4 (ca. 5% represented by its sulfoxide) and β10 significantly correlated (r = 0.856; N = 9), and their ratio was about 5. A significant correlation was also observed between Tβ4 concentrations in whole saliva and gingival crevicular fluid (r = 0.738; N = 9). Immunohistochemical analysis of the major salivary glands showed that immunoreactivity for Tβ4 is restricted to ductal cells, with minor degree of focal positivity in some acinar cells. On the whole, results indicate that gingival sulcus is a main, although not the sole, source for oral Tβ4 and Tβ10. |
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Keywords: | Gingival crevicular fluid Human Saliva Thymosin β 4 Thymosin β 10 |
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