The distribution of mannose-6-phosphate receptors changes from newborns to adults in rat liver |
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Authors: | Jofré Guillermo Carvelli Lorena Aguilera Andrea C Sartor Tirso Gonzalez-Jatuff Adriana Sosa Miguel A |
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Affiliation: | aLaboratorio de Biología y Fisiología Celular “Dr. Francisco Bertini”, Instituto de Histología y Embriología, Facultad de Ciencias Médicas, Universidad Nacional de Cuyo, Mendoza, Argentina;bInstituto de Ciencias Básicas (ICB), Universidad Nacional de Cuyo, Mendoza, Argentina;cIMBECU–CONICET, Argentina |
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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. |
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Keywords: | Mannose-6-phosphate receptors Lysosomal enzymes Organ development |
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