Expression and binding properties of the two mannose-6-phosphate receptors differ during perinatal development in rat liver

ROMANO, PATRICIA; LÓPEZ, ANA C; MARIANI, MARIA L; SARTOR, TIRSO; BELMONTE, SILVIA A; SOSA, MIGUEL ANGEL

Biochemical and Biophysical Research Communications

Academic Press (Elsevier Science)

Lugar: U.S.A; Año: 2002 vol. 295 p. 1000 - 1006

<!-- /* Style Definitions */ p.MsoNormal, li.MsoNormal, div.MsoNormal {mso-style-parent:""; margin:0cm; margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:12.0pt; font-family:"Times New Roman"; mso-fareast-font-family:"Times New Roman";} @page Section1 {size:595.3pt 841.9pt; margin:70.85pt 3.0cm 70.85pt 3.0cm; mso-header-margin:35.4pt; mso-footer-margin:35.4pt; mso-paper-source:0;} div.Section1 {page:Section1;} --> Expression and binding properties of the two mannose-6-phosphate receptors differ during perinatal development in rat liver. Romano PS, López AC, Mariani ML, Sartor T, Belmonte SA, Sosa MA.   Facultad de Ciencias Médicas, Instituto de Histología y Embriología (IHEM), Universidad Nacional de Cuyo (Argentina), Casilla de Correo 56-(5500), Mendoza, Argentina.   Mammalian tissues express both cation-dependent (CD-MPR) and cation-independent (CI-MPR) mannose-6-phosphate receptors, which mediate the targeting of acid hydrolases to lysosomes. The coexistence of the two receptors in all cell types and tissues is still poorly understood. To determine whether these receptors might play a role in maturation, we studied their expression and binding properties in rat liver during perinatal development. CI-MPR expression decreases progressively from 18-day fetuses to adults, whereas the CD-MPR showed a transient decrease in newborn and at the 5th day after birth. Immunostaining of the tissues showed that both receptors localize to hepatocytes at all the ages and, additionally, the CD-MPR was reactive in megakaryocytes at early stages. Binding assays showed differences in the B(max) and K(D) values between the ages studied. These results demonstrate that both receptors change differentially during perinatal development, suggesting that they play distinct roles during organ maturation.   PMID: 12127995 [PubMed - indexed for MEDLINE   Biochem Biophys Res Commun. 2002 Jul 26;295(4):1000-6.