title: Molecular alterations of parotid saliva in infantile chronic recurrent parotitis.
abstract: Infantile chronic recurrent parotitis (ICRP) is an insidious disease whose etiopathogenesis remains an enigma. Alterations in the physical appearance of parotid saliva from ICRP patients have been frequently reported. However, sialochemical studies in regard to ICRP are very rare. The aim of this study was to determine whether saliva of ICRP patients presents major physicochemical and biochemical alterations compared with saliva from paired healthy controls. Parotid, whole, and submandibular/sublingual saliva was collected at an asymptomatic stage from 33 ICRP patients (5-16 y old, both sexes) and from 33 sex- and age-matched healthy controls. Saliva was analyzed for protein concentration, mode of protein diffusion on cellulose membranes, unidimensional sodium dodecylsulfate (SDS)-polyacrylamide gel electrophoresis protein profiles and zymographic profiles of metalloproteinase 2 (MMP-2) and metalloproteinase 9 (MMP-9). Parotid saliva of ICRP patients showed an increased protein concentration, altered mode of protein diffusion, a higher frequency of polypeptide bands of 43, 37, 33, 29, 26, 16, and 10 kD, higher asymmetry in the polypeptide profiles of both contralateral parotid saliva, and an increase in the frequency of MMP-2 and MMP-9. Parotid saliva of patients with ICRP is molecularly altered with respect to normal saliva. Some of the molecular differences could be related to the etiopathogenesis of the disease.
authors.affiliation: Oral Biology and Biochemistry Laboratory, Center for Oral Research (CIO), Faculty of Dentistry, University of Chile, PC-838-0492 Independencia, Santiago, Chile. imorales@uchile.cl
authors.forename: Irene
authors.initials: I
authors.lastname: Morales-Bozo
authors.forename: Blanca
authors.initials: B
authors.lastname: Urzúa-Orellana
authors.forename: Mirtha
authors.initials: M
authors.lastname: Landaeta
authors.forename: Raúl
authors.initials: R
authors.lastname: Montalbán
authors.forename: Jimena
authors.initials: J
authors.lastname: Torres
authors.forename: Alvaro
authors.initials: A
authors.lastname: Pinochet
authors.forename: Gustavo
authors.initials: G
authors.lastname: Valverde
authors.forename: Andrea
authors.initials: A
authors.lastname: Muñoz-Martínez
mesh_terms: D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D002908:Chronic Disease; D005260:Female; D006801:Humans; D008297:Male; D020778:Matrix Metalloproteinase 2 / Q000378:metabolism; D020780:Matrix Metalloproteinase 9 / Q000378:metabolism; D010306:Parotid Gland / Q000737:chemistry / Q000201:enzymology; D010309:Parotitis / Q000201:enzymology / Q000378:metabolism* / Q000473:pathology; D012008:Recurrence; D012463:Saliva / Q000737:chemistry / Q000378:metabolism*; D012471:Salivary Proteins and Peptides / Q000378:metabolism*
chemical_list: D012471:Salivary Proteins and Peptides; D020778:Matrix Metalloproteinase 2; D020780:Matrix Metalloproteinase 9