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. 1993 Jun 1;121(5):1011–1020. doi: 10.1083/jcb.121.5.1011

Macropinosome maturation and fusion with tubular lysosomes in macrophages

PMCID: PMC2119679  PMID: 8099075

Abstract

Macropinosomes formed by addition of recombinant macrophage colony- stimulating factor (rM-CSF) to mouse macrophages migrate centripetally and shrink, remaining detectable by phase microscopy for up to 15 min. This longevity allowed us to study how macropinosomes age. Macropinosomes were pulse labeled for 1 min with fixable fluorescein dextran (FDx10f), a probe for fluid phase pinocytosis, and chased for various times. To quantify changes in their antigenic profile, pulse- labeled macropinosomes of different ages were fixed and stained for immunofluorescence with a panel of antibodies specific for the transferrin receptor (TfR), the late endosome-specific, GTP-binding protein rab 7 or lysosomal glycoprotein A (lgp-A), and the percentage of antibody positive, FDx10f-labeled macropinosomes was scored. Some newly formed macropinosomes were positive for TfR, but few were rab 7 or lgp-A-positive. With intermediate chase times (2-4 min), staining for rab 7 and lgp-A increased to > 60%, while TfR staining declined. After a long chase (9-12 min), rab 7 staining returned to low levels while lgp-A staining remained at a high level. Thus, macropinosomes matured by progressive acquisition and loss of characteristic endocytic vesicle markers. However, unlike a maturation process, their merger with the tubular lysosomal compartment more nearly resembled the incorporation of a transient vesicle into a pre-existing, stable compartment. Shortly after their formation, FDx10f-labeled macropinosomes contacted and merged with Texas red dextran (TRDx10)- labeled tubular lysosomes. This occurred in two steps: macropinosomes acquired lgp-A first, and then several minutes later the cation- independent mannose-6-phosphate receptor (CI-MPR) and markers of lysosomal content (cathepsin L or pre-loaded TRDx10), all apparently derived from tubular lysosomes. Thus, macropinosome progress through macrophages showed features of both the maturation and vesicle shuttle models of endocytosis, beginning with a maturation process and ending by merger into a stable, resident lysosomal compartment.

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Selected References

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  1. Bucci C., Parton R. G., Mather I. H., Stunnenberg H., Simons K., Hoflack B., Zerial M. The small GTPase rab5 functions as a regulatory factor in the early endocytic pathway. Cell. 1992 Sep 4;70(5):715–728. doi: 10.1016/0092-8674(92)90306-w. [DOI] [PubMed] [Google Scholar]
  2. COHN Z. A., BENSON B. THE IN VITRO DIFFERENTIATION OF MONONUCLEAR PHAGOCYTES. II. THE INFLUENCE OF SERUM ON GRANULE FORMATION, HYDROLASE PRODUCTION, AND PINOCYTOSIS. J Exp Med. 1965 May 1;121:835–848. doi: 10.1084/jem.121.5.835. [DOI] [PMC free article] [PubMed] [Google Scholar]
  3. 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]
  4. Chen J. W., Murphy T. L., Willingham M. C., Pastan I., August J. T. Identification of two lysosomal membrane glycoproteins. J Cell Biol. 1985 Jul;101(1):85–95. doi: 10.1083/jcb.101.1.85. [DOI] [PMC free article] [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. Dong J. M., Prence E. M., Sahagian G. G. Mechanism for selective secretion of a lysosomal protease by transformed mouse fibroblasts. J Biol Chem. 1989 May 5;264(13):7377–7383. [PubMed] [Google Scholar]
  7. Dunn K. W., Maxfield F. R. Delivery of ligands from sorting endosomes to late endosomes occurs by maturation of sorting endosomes. J Cell Biol. 1992 Apr;117(2):301–310. doi: 10.1083/jcb.117.2.301. [DOI] [PMC free article] [PubMed] [Google Scholar]
  8. 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]
  9. Granger B. L., Green S. A., Gabel C. A., Howe C. L., Mellman I., Helenius A. Characterization and cloning of lgp110, a lysosomal membrane glycoprotein from mouse and rat cells. J Biol Chem. 1990 Jul 15;265(20):12036–12043. [PubMed] [Google Scholar]
  10. 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]
  11. Harding C. V., Geuze H. J. Class II MHC molecules are present in macrophage lysosomes and phagolysosomes that function in the phagocytic processing of Listeria monocytogenes for presentation to T cells. J Cell Biol. 1992 Nov;119(3):531–542. doi: 10.1083/jcb.119.3.531. [DOI] [PMC free article] [PubMed] [Google Scholar]
  12. Heuser J. Changes in lysosome shape and distribution correlated with changes in cytoplasmic pH. J Cell Biol. 1989 Mar;108(3):855–864. doi: 10.1083/jcb.108.3.855. [DOI] [PMC free article] [PubMed] [Google Scholar]
  13. 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]
  14. Kornfeld S., Mellman I. The biogenesis of lysosomes. Annu Rev Cell Biol. 1989;5:483–525. doi: 10.1146/annurev.cb.05.110189.002411. [DOI] [PubMed] [Google Scholar]
  15. Lesley J., Hyman R., Schulte R., Trotter J. Expression of transferrin receptor on murine hematopoietic progenitors. Cell Immunol. 1984 Jan;83(1):14–25. doi: 10.1016/0008-8749(84)90220-x. [DOI] [PubMed] [Google Scholar]
  16. Lokeshwar B. L., Lin H. S. Growth factor-dependent regulation of transferrin receptor in proliferating and quiescent macrophages. Cell Immunol. 1990 Oct 15;130(2):401–415. doi: 10.1016/0008-8749(90)90282-v. [DOI] [PubMed] [Google Scholar]
  17. MacDonald R. G., Tepper M. A., Clairmont K. B., Perregaux S. B., Czech M. P. Serum form of the rat insulin-like growth factor II/mannose 6-phosphate receptor is truncated in the carboxyl-terminal domain. J Biol Chem. 1989 Feb 25;264(6):3256–3261. [PubMed] [Google Scholar]
  18. Magee T., Newman C. The role of lipid anchors for small G proteins in membrane trafficking. Trends Cell Biol. 1992 Nov;2(11):318–323. doi: 10.1016/0962-8924(92)90172-j. [DOI] [PubMed] [Google Scholar]
  19. Marsh M., Griffiths G., Dean G. E., Mellman I., Helenius A. Three-dimensional structure of endosomes in BHK-21 cells. Proc Natl Acad Sci U S A. 1986 May;83(9):2899–2903. doi: 10.1073/pnas.83.9.2899. [DOI] [PMC free article] [PubMed] [Google Scholar]
  20. McLean I. W., Nakane P. K. Periodate-lysine-paraformaldehyde fixative. A new fixation for immunoelectron microscopy. J Histochem Cytochem. 1974 Dec;22(12):1077–1083. doi: 10.1177/22.12.1077. [DOI] [PubMed] [Google Scholar]
  21. Mellman I., Fuchs R., Helenius A. Acidification of the endocytic and exocytic pathways. Annu Rev Biochem. 1986;55:663–700. doi: 10.1146/annurev.bi.55.070186.003311. [DOI] [PubMed] [Google Scholar]
  22. 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]
  23. Pearse B. M., Robinson M. S. Clathrin, adaptors, and sorting. Annu Rev Cell Biol. 1990;6:151–171. doi: 10.1146/annurev.cb.06.110190.001055. [DOI] [PubMed] [Google Scholar]
  24. Rabinowitz S., Horstmann H., Gordon S., Griffiths G. Immunocytochemical characterization of the endocytic and phagolysosomal compartments in peritoneal macrophages. J Cell Biol. 1992 Jan;116(1):95–112. doi: 10.1083/jcb.116.1.95. [DOI] [PMC free article] [PubMed] [Google Scholar]
  25. Racoosin E. L., Swanson J. A. M-CSF-induced macropinocytosis increases solute endocytosis but not receptor-mediated endocytosis in mouse macrophages. J Cell Sci. 1992 Aug;102(Pt 4):867–880. doi: 10.1242/jcs.102.4.867. [DOI] [PubMed] [Google Scholar]
  26. Racoosin E. L., Swanson J. A. Macrophage colony-stimulating factor (rM-CSF) stimulates pinocytosis in bone marrow-derived macrophages. J Exp Med. 1989 Nov 1;170(5):1635–1648. doi: 10.1084/jem.170.5.1635. [DOI] [PMC free article] [PubMed] [Google Scholar]
  27. Rodman J. S., Mercer R. W., Stahl P. D. Endocytosis and transcytosis. Curr Opin Cell Biol. 1990 Aug;2(4):664–672. doi: 10.1016/0955-0674(90)90108-q. [DOI] [PubMed] [Google Scholar]
  28. 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]
  29. 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]
  30. Swanson J., Bushnell A., Silverstein S. C. Tubular lysosome morphology and distribution within macrophages depend on the integrity of cytoplasmic microtubules. Proc Natl Acad Sci U S A. 1987 Apr;84(7):1921–1925. doi: 10.1073/pnas.84.7.1921. [DOI] [PMC free article] [PubMed] [Google Scholar]
  31. Tooze J., Hollinshead M. Tubular early endosomal networks in AtT20 and other cells. J Cell Biol. 1991 Nov;115(3):635–653. doi: 10.1083/jcb.115.3.635. [DOI] [PMC free article] [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. Wang Y. L., Goren M. B. Differential and sequential delivery of fluorescent lysosomal probes into phagosomes in mouse peritoneal macrophages. J Cell Biol. 1987 Jun;104(6):1749–1754. doi: 10.1083/jcb.104.6.1749. [DOI] [PMC free article] [PubMed] [Google Scholar]
  34. Wileman T., Harding C., Stahl P. Receptor-mediated endocytosis. Biochem J. 1985 Nov 15;232(1):1–14. doi: 10.1042/bj2320001. [DOI] [PMC free article] [PubMed] [Google Scholar]
  35. Willingham M. C., Yamada S. S. A mechanism for the destruction of pinosomes in cultured fibroblasts. Piranhalysis. J Cell Biol. 1978 Aug;78(2):480–487. doi: 10.1083/jcb.78.2.480. [DOI] [PMC free article] [PubMed] [Google Scholar]
  36. 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]
  37. van der Sluijs P., Hull M., Webster P., Mâle P., Goud B., Mellman I. The small GTP-binding protein rab4 controls an early sorting event on the endocytic pathway. Cell. 1992 Sep 4;70(5):729–740. doi: 10.1016/0092-8674(92)90307-x. [DOI] [PubMed] [Google Scholar]

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