Delivery of ligands from sorting endosomes to late endosomes occurs by maturation of sorting endosomes (original) (raw)

Abstract

After endocytosis, lysosomally targeted ligands pass through a series of endosomal compartments. The endocytic apparatus that accomplishes this passage may be considered to take one of two forms: (a) a system in which lysosomally targeted ligands pass through preexisting, long- lived early sorting endosomes and are then selectively transported to long-lived late endosomes in carrier vesicles, or (b) a system in which lysosomally targeted ligands are delivered to early sorting endosomes which themselves mature into late endosomes. We have previously shown that sorting endosomes in CHO cells fuse with newly formed endocytic vesicles (Dunn, K. W., T. E. McGraw, and F. R. Maxfield. 1989. J. Cell Biol. 109:3303-3314) and that previously endocytosed ligands lose their accessibility to fusion with a half-time of approximately 8 min (Salzman, N. H., and F. R. Maxfield. 1989. J. Cell Biol. 109:2097- 2104). Here we have studied the properties of individual endosomes by digital image analysis to distinguish between the two mechanisms for entry of ligands into late endosomes. We incubated TRVb-1 cells (derived from CHO cells) with diO-LDL followed, after a variable chase, by diI-LDL, and measured the diO content of diI-containing endosomes. As the chase period was lengthened, an increasing percentage of the endosomes containing diO-LDL from the initial incubation had no detectable diI-LDL from the second incubation, but those endosomes that contained both probes showed no decrease in the amount of diO-LDL per endosomes. These results indicate that (a) a pulse of fluorescent LDL is retained by individual sorting endosomes, and (b) with time sorting endosomes lose the ability to fuse with primary endocytic vesicles. These data are inconsistent with a preexisting compartment model which predicts that the concentration of ligand in sorting endosomes will decline during a chase interval, but that the ability of the stable sorting endosome to receive newly endocytosed ligands will remain high. These data are consistent with a maturation mechanism in which the sorting endosome retains and accumulates lysosomally directed ligands until it loses its ability to fuse with newly formed endocytic vesicles and matures into a late endosome. We also find that, as expected according to the maturation model, new sorting endosomes are increasingly labeled during the chase period indicating that new sorting endosomes are continuously formed to replace those that have matured into late endosomes.(ABSTRACT TRUNCATED AT 400 WORDS)

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  1. Anderson R. G., Goldstein J. L., Brown M. S. A mutation that impairs the ability of lipoprotein receptors to localise in coated pits on the cell surface of human fibroblasts. Nature. 1977 Dec 22;270(5639):695–699. doi: 10.1038/270695a0. [DOI] [PubMed] [Google Scholar]
  2. Carpenter G., Cohen S. Epidermal growth factor. Annu Rev Biochem. 1979;48:193–216. doi: 10.1146/annurev.bi.48.070179.001205. [DOI] [PubMed] [Google Scholar]
  3. Chavrier P., Gorvel J. P., Stelzer E., Simons K., Gruenberg J., Zerial M. Hypervariable C-terminal domain of rab proteins acts as a targeting signal. Nature. 1991 Oct 24;353(6346):769–772. doi: 10.1038/353769a0. [DOI] [PubMed] [Google Scholar]
  4. Chavrier P., Parton R. G., Hauri H. P., Simons K., Zerial M. Localization of low molecular weight GTP binding proteins to exocytic and endocytic compartments. Cell. 1990 Jul 27;62(2):317–329. doi: 10.1016/0092-8674(90)90369-p. [DOI] [PubMed] [Google Scholar]
  5. Dautry-Varsat A., Ciechanover A., Lodish H. F. pH and the recycling of transferrin during receptor-mediated endocytosis. Proc Natl Acad Sci U S A. 1983 Apr;80(8):2258–2262. doi: 10.1073/pnas.80.8.2258. [DOI] [PMC free article] [PubMed] [Google Scholar]
  6. Dunn K. W., McGraw T. E., Maxfield F. R. Iterative fractionation of recycling receptors from lysosomally destined ligands in an early sorting endosome. J Cell Biol. 1989 Dec;109(6 Pt 2):3303–3314. doi: 10.1083/jcb.109.6.3303. [DOI] [PMC free article] [PubMed] [Google Scholar]
  7. Geuze H. J., Slot J. W., Strous G. J., Lodish H. F., Schwartz A. L. Intracellular site of asialoglycoprotein receptor-ligand uncoupling: double-label immunoelectron microscopy during receptor-mediated endocytosis. Cell. 1983 Jan;32(1):277–287. doi: 10.1016/0092-8674(83)90518-4. [DOI] [PubMed] [Google Scholar]
  8. Geuze H. J., Stoorvogel W., Strous G. J., Slot J. W., Bleekemolen J. E., Mellman I. Sorting of mannose 6-phosphate receptors and lysosomal membrane proteins in endocytic vesicles. J Cell Biol. 1988 Dec;107(6 Pt 2):2491–2501. doi: 10.1083/jcb.107.6.2491. [DOI] [PMC free article] [PubMed] [Google Scholar]
  9. Goldstein J. L., Anderson R. G., Brown M. S. Coated pits, coated vesicles, and receptor-mediated endocytosis. Nature. 1979 Jun 21;279(5715):679–685. doi: 10.1038/279679a0. [DOI] [PubMed] [Google Scholar]
  10. Goldstein J. L., Basu S. K., Brown M. S. Receptor-mediated endocytosis of low-density lipoprotein in cultured cells. Methods Enzymol. 1983;98:241–260. doi: 10.1016/0076-6879(83)98152-1. [DOI] [PubMed] [Google Scholar]
  11. Goldstein J. L., Brown M. S., Anderson R. G., Russell D. W., Schneider W. J. Receptor-mediated endocytosis: concepts emerging from the LDL receptor system. Annu Rev Cell Biol. 1985;1:1–39. doi: 10.1146/annurev.cb.01.110185.000245. [DOI] [PubMed] [Google Scholar]
  12. Gorvel J. P., Chavrier P., Zerial M., Gruenberg J. rab5 controls early endosome fusion in vitro. Cell. 1991 Mar 8;64(5):915–925. doi: 10.1016/0092-8674(91)90316-q. [DOI] [PubMed] [Google Scholar]
  13. Griffiths G., Back R., Marsh M. A quantitative analysis of the endocytic pathway in baby hamster kidney cells. J Cell Biol. 1989 Dec;109(6 Pt 1):2703–2720. doi: 10.1083/jcb.109.6.2703. [DOI] [PMC free article] [PubMed] [Google Scholar]
  14. Griffiths G., Gruenberg J. The arguments for pre-existing early and late endosomes. Trends Cell Biol. 1991 Jul;1(1):5–9. doi: 10.1016/0962-8924(91)90047-d. [DOI] [PubMed] [Google Scholar]
  15. Griffiths G., Hoflack B., Simons K., Mellman I., Kornfeld S. The mannose 6-phosphate receptor and the biogenesis of lysosomes. Cell. 1988 Feb 12;52(3):329–341. doi: 10.1016/s0092-8674(88)80026-6. [DOI] [PubMed] [Google Scholar]
  16. Gruenberg J., Griffiths G., Howell K. E. Characterization of the early endosome and putative endocytic carrier vesicles in vivo and with an assay of vesicle fusion in vitro. J Cell Biol. 1989 Apr;108(4):1301–1316. doi: 10.1083/jcb.108.4.1301. [DOI] [PMC free article] [PubMed] [Google Scholar]
  17. Gruenberg J., Howell K. E. Membrane traffic in endocytosis: insights from cell-free assays. Annu Rev Cell Biol. 1989;5:453–481. doi: 10.1146/annurev.cb.05.110189.002321. [DOI] [PubMed] [Google Scholar]
  18. Hopkins C. R., Gibson A., Shipman M., Miller K. Movement of internalized ligand-receptor complexes along a continuous endosomal reticulum. Nature. 1990 Jul 26;346(6282):335–339. doi: 10.1038/346335a0. [DOI] [PubMed] [Google Scholar]
  19. Klausner R. D., Ashwell G., van Renswoude J., Harford J. B., Bridges K. R. Binding of apotransferrin to K562 cells: explanation of the transferrin cycle. Proc Natl Acad Sci U S A. 1983 Apr;80(8):2263–2266. doi: 10.1073/pnas.80.8.2263. [DOI] [PMC free article] [PubMed] [Google Scholar]
  20. Maxfield F. R., Schlessinger J., Shechter Y., Pastan I., Willingham M. C. Collection of insulin, EGF and alpha2-macroglobulin in the same patches on the surface of cultured fibroblasts and common internalization. Cell. 1978 Aug;14(4):805–810. doi: 10.1016/0092-8674(78)90336-7. [DOI] [PMC free article] [PubMed] [Google Scholar]
  21. McGraw T. E., Greenfield L., Maxfield F. R. Functional expression of the human transferrin receptor cDNA in Chinese hamster ovary cells deficient in endogenous transferrin receptor. J Cell Biol. 1987 Jul;105(1):207–214. doi: 10.1083/jcb.105.1.207. [DOI] [PMC free article] [PubMed] [Google Scholar]
  22. Mostov K. E., Simister N. E. Transcytosis. Cell. 1985 Dec;43(2 Pt 1):389–390. doi: 10.1016/0092-8674(85)90166-7. [DOI] [PubMed] [Google Scholar]
  23. Murphy R. F. Maturation models for endosome and lysosome biogenesis. Trends Cell Biol. 1991 Oct;1(4):77–82. doi: 10.1016/0962-8924(91)90022-2. [DOI] [PubMed] [Google Scholar]
  24. Palade G. Intracellular aspects of the process of protein synthesis. Science. 1975 Aug 1;189(4200):347–358. doi: 10.1126/science.1096303. [DOI] [PubMed] [Google Scholar]
  25. Pitas R. E., Innerarity T. L., Weinstein J. N., Mahley R. W. Acetoacetylated lipoproteins used to distinguish fibroblasts from macrophages in vitro by fluorescence microscopy. Arteriosclerosis. 1981 May-Jun;1(3):177–185. doi: 10.1161/01.atv.1.3.177. [DOI] [PubMed] [Google Scholar]
  26. Roederer M., Barry J. R., Wilson R. B., Murphy R. F. Endosomes can undergo an ATP-dependent density increase in the absence of dense lysosomes. Eur J Cell Biol. 1990 Apr;51(2):229–234. [PubMed] [Google Scholar]
  27. Salzman N. H., Maxfield F. R. Fusion accessibility of endocytic compartments along the recycling and lysosomal endocytic pathways in intact cells. J Cell Biol. 1989 Nov;109(5):2097–2104. doi: 10.1083/jcb.109.5.2097. [DOI] [PMC free article] [PubMed] [Google Scholar]
  28. Salzman N. H., Maxfield F. R. Intracellular fusion of sequentially formed endocytic compartments. J Cell Biol. 1988 Apr;106(4):1083–1091. doi: 10.1083/jcb.106.4.1083. [DOI] [PMC free article] [PubMed] [Google Scholar]
  29. Schmid S. L., Fuchs R., Male P., Mellman I. Two distinct subpopulations of endosomes involved in membrane recycling and transport to lysosomes. Cell. 1988 Jan 15;52(1):73–83. doi: 10.1016/0092-8674(88)90532-6. [DOI] [PubMed] [Google Scholar]
  30. Stoorvogel W., Geuze H. J., Griffith J. M., Strous G. J. The pathways of endocytosed transferrin and secretory protein are connected in the trans-Golgi reticulum. J Cell Biol. 1988 Jun;106(6):1821–1829. doi: 10.1083/jcb.106.6.1821. [DOI] [PMC free article] [PubMed] [Google Scholar]
  31. Stoorvogel W., Strous G. J., Geuze H. J., Oorschot V., Schwartz A. L. Late endosomes derive from early endosomes by maturation. Cell. 1991 May 3;65(3):417–427. doi: 10.1016/0092-8674(91)90459-c. [DOI] [PubMed] [Google Scholar]
  32. Van Der Sluijs P., Hull M., Zahraoui A., Tavitian A., Goud B., Mellman I. The small GTP-binding protein rab4 is associated with early endosomes. Proc Natl Acad Sci U S A. 1991 Jul 15;88(14):6313–6317. doi: 10.1073/pnas.88.14.6313. [DOI] [PMC free article] [PubMed] [Google Scholar]
  33. Ward D. M., Ajioka R., Kaplan J. Cohort movement of different ligands and receptors in the intracellular endocytic pathway of alveolar macrophages. J Biol Chem. 1989 May 15;264(14):8164–8170. [PubMed] [Google Scholar]
  34. Ward D. M., Hackenyos D. P., Kaplan J. Fusion of sequentially internalized vesicles in alveolar macrophages. J Cell Biol. 1990 Apr;110(4):1013–1022. doi: 10.1083/jcb.110.4.1013. [DOI] [PMC free article] [PubMed] [Google Scholar]
  35. Yamashiro D. J., Tycko B., Fluss S. R., Maxfield F. R. Segregation of transferrin to a mildly acidic (pH 6.5) para-Golgi compartment in the recycling pathway. Cell. 1984 Jul;37(3):789–800. doi: 10.1016/0092-8674(84)90414-8. [DOI] [PubMed] [Google Scholar]