title: The distribution of mannose-6-phosphate receptors changes from newborns to adults in rat liver.
abstract: The co-existence of two types of mannose-6-phosphate receptors (CD-MPR and CI-MPR) in most cell types is still not well explained. Some evidence suggests that the CI-MPR could be actively involved in the regulation of growth factors in the early stages of mammalian organ development. In this study, it was demonstrated that both receptors are distributed in a non-overlapping fashion in rat liver, and that the distribution of CI-MPR changes over a percoll gradient between newborn and adult animals. By using marker proteins it was observed that in newborns the CI-MPR is located both in intracellular fractions and in fractions that coincide with a plasma membrane marker, whereas in adults it is only detected in intracellular fractions. It was also noted that N-acetyl-β-D-glucosaminidase distribution is closer to CI-MPR than to CD-MPR and that acid phosphatase did not match with any receptor. This evidence may also suggest that both receptors have different functions, mainly at early stages in the development of organs.
authors.affiliation: Laboratorio de Biología y Fisiología Celular Dr. Francisco Bertini, Instituto de Histología y Embriología, Facultad de Ciencias Médicas, Universidad Nacional de Cuyo, Mendoza, Argentina.
authors.forename: Guillermo
authors.initials: G
authors.lastname: Jofré
authors.forename: Lorena
authors.initials: L
authors.lastname: Carvelli
authors.forename: Andrea C
authors.initials: AC
authors.lastname: Aguilera
authors.forename: Tirso
authors.initials: T
authors.lastname: Sartor
authors.forename: Adriana
authors.initials: A
authors.lastname: Gonzalez-Jatuff
authors.forename: Miguel A
authors.initials: MA
authors.lastname: Sosa
mesh_terms: D000818:Animals; D000831:Animals, Newborn; D008099:Liver / Q000254:growth & development / Q000378:metabolism*; D038081:Organogenesis; D051381:Rats; D017207:Rats, Sprague-Dawley; D017527:Receptor, IGF Type 2 / Q000235:genetics / Q000378:metabolism*
chemical_list: D017527:Receptor, IGF Type 2