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Glycosylphosphatidylinositol-anchored and core protein-intercalated heparan sulfate proteoglycans in rat ovarian granulosa cells have distinct secretory, endocytotic, and intracellular degradative pathways.
Abstract
Rat ovarian granulosa cells synthesize two distinct species of plasma membrane-intercalated heparan sulfate (HS) proteoglycans; glycosylphosphatidylinositol (GPI)-anchored and core protein-intercalated HS proteoglycans. Both species of HS proteoglycans are primarily localized on the plasma membrane. Cell surface localization of GPI-anchored and protein-intercalated HS proteoglycans can be determined by their accessibility to exogenously added phosphatidylinositol-specific phospholipase C (PI-PLC) and trypsin, respectively. Kinetic parameters for the processes involving their transfer from the Golgi to the cell surface, endocytosis and secretion, and the modes of intracellular degradation were determined by metabolic labeling experiments using [35S]sulfate and various chase protocols in combination with the use of PI-PLC and trypsin in rat ovarian granulosa cells. The experiments demonstrated that (i) both HS proteoglycan species are transferred from the Golgi to the cell surface with an average transit time of approximately 12 min. (ii) GPI-anchored HS proteoglycans are endocytosed with a t1/2 approximately 3 h, without being shed into the medium, and they are rapidly degraded, t1/2 approximately 25 min, without generating recognizable degradation intermediates. (iii) Protein-intercalated HS proteoglycans are partly (approximately 30%) shed from the cell surface into the medium and the remaining approximately 70% are endocytosed with a t1/2 approximately 4 h. After endocytosi…
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“Since membrane proteoglycans undergo clustering and constitutive endocytosis (4, 22, 62, 63), lipoproteins bound to the proteoglycans could “piggy-back” into the cell.”
From Liver heparan sulfate proteoglycans mediate clearance of triglyceride-rich lipoproteins independently of LDL receptor family members (2007) · cites this paper as [62]
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MacArthur, J. M., Bishop, J. R., Stanford, K. I., Wang, L., Bensadoun, A., Witztum, J. L., & Esko, J. D. (2007) · Journal of Clinical Investigation · doi:10.1172/jci29154 · Cited by 216
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Metadata
- Authors
- Yanagishita, M.
- Venue
- Journal of Biological Chemistry
- Publisher
- Elsevier BV
- Published
- 1992-05
- Volume
- 267
- Issue
- 14
- Pages
- 9505-9511
- ISSN
- 0021-9258
- Cited by
- 51
- References
- 0
- Language
- en
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