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Bauskin AR, Jiang L, Luo XW, Wu L, Brown DA, Breit SN. The TGF-beta superfamily cytokine MIC-1/GDF15: secretory mechanisms facilitate creation of latent stromal stores. J Interferon Cytokine Res 2010; 30:389-97. [PMID: 20187768 DOI: 10.1089/jir.2009.0052] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Macrophage inhibitory cytokine-1/growth differentiation factor 15 (MIC-1/GDF15), a divergent member of the TGF-beta superfamily is induced by a range of proinflammatory cytokines and oxidized low-density lipoprotein (oxLDL) and is highly expressed in macrophages in atherosclerotic and tumor lesions. MIC-1/GDF15, a major p53 target gene, is largely described to have anti-tumorigenic activity and more recently high MIC-1/GDF15 serum levels in late stage cancer were shown to be the major cause of cancer-associated weight loss. MIC-1/GDF15 serum levels independently predict both atherosclerotic events and severity of rheumatoid arthritis (RA), suggesting serum levels are important in modifying disease expression. Controlling serum levels is the ratio of latent unprocessed MIC-1/GDF15 stromal stores to soluble mature MIC-1/GDF15 generated by the cell. Here, we investigate MIC-1/GDF15 secretion from U937 monocytoid cells and identify novel mechanisms designed to ensure secretion of unprocessed cytokine and creation of latent stromal stores. We find that endogenous MIC-1/GDF15 is secreted as both processed and unprocessed forms. Pulse chase analysis of MIC-1/GDF15 secretion reveals that unprocessed MIC-1/GDF15 precursor is rapidly secreted, while mature MIC-1/GDF15 generated within the cell by intracellular processing is secreted much slower, possibly via an alternate secretory route. The COOH-T 47 amino acids of the propeptide are responsible for rapid secretion of MIC-1/GDF15 precursor and this effect occurs in the trans-Golgi network (TGN)/post TGN compartment. Thus, variations in MIC-1/GDF15 intracellular processing, regulating the presence or absence of propeptide, are a powerful mechanism modulating rate of MIC-1/GDF15 secretion and proMIC-1/GDF15 stromal storage, with major impact on circulating levels of mature MIC-1/GDF15.
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Affiliation(s)
- Asne R Bauskin
- St. Vincent's Centre for Applied Medical Research, St. Vincent's Hospital and University of New South Wales, Sydney, Australia.
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Kim TH, Kim DH, Nam HW, Park SY, Shim J, Cho JW. Tyrosylprotein sulfotransferase regulates collagen secretion in Caenorhabditis elegans. Mol Cells 2010; 29:413-8. [PMID: 20229090 DOI: 10.1007/s10059-010-0049-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2009] [Accepted: 12/17/2009] [Indexed: 10/19/2022] Open
Abstract
The sulfation of tyrosine residues is an important post-translational modification involved in the regulation of protein function. We examined the activity of worm tyrosylprotein sulfotransferase (TPST-1) on a typical cuticle collagen, ROL-6, in C. elegans. We verified that TPST-1 sulfates three tyrosine residues of ROL-6 in vitro. We found that these tyrosine residues are important for the secretion of ROL-6::GFP. Mutant ROL-6::GFP proteins that contain more than two substitutions of the target tyrosine residues are severely deficient in cuticle localization. Consistently, knock down of tpst-1 blocked the cuticle localization of ROL-6::GFP. Therefore, the sulfation of ROL-6 by TPST-1 is critical for the proper localization of ROL-6. We also confirmed that worm TPST-1 is localized to the trans-Golgi network (TGN). Our results indicate that TPST-1 regulates cuticle organization by promoting the transport of ROL-6 from the TGN to the cuticle.
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Affiliation(s)
- Tai Hoon Kim
- Department of Biology, Yonsei University, Seoul, 120-749, Korea
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Zhao E, Hu H, Trudeau VL. Secretoneurin as a hormone regulator in the pituitary. ACTA ACUST UNITED AC 2009; 165:117-22. [PMID: 20006654 DOI: 10.1016/j.regpep.2009.11.019] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2009] [Revised: 11/25/2009] [Accepted: 11/26/2009] [Indexed: 11/30/2022]
Abstract
Secretoneurin (SN) is a 33-34 amino acid peptide derived from the most conserved sequence of the secretogranin (SgII) precursor. SgII is a granin protein found in the secretory granules of neuroendocrine tissues. There are two paralogs of teleost SgII that we name here SgIIa and SgIIb. Processing of these proteins would yield SNa and SNb in fish. Secretoneurin immunoreactivity is found within all the major pituitary cell types in mammals. In goldfish, it appears to be mainly expressed in the prolactin cells of the rostral pars distalis. We have investigated the paracrine role of goldfish SN (SNa) to stimulate luteinizing hormone from gonadotrophs in the neighboring proximal pars distalis. Another source of SN is the hypophysiotropic neurons that may deliver SN to target cells by direct pituitary innervation. Little else is known about the neuroendocrine role of SN. We also discuss the evolution, distribution and production of SN in the pituitary.
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Affiliation(s)
- E Zhao
- Centre for Advanced Research in Environmental Genomics, Department of Biology, University of Ottawa, 30 Marie Curie, Ottawa, ON, Canada
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Mattila PE, Kinlough CL, Bruns JR, Weisz OA, Hughey RP. MUC1 traverses apical recycling endosomes along the biosynthetic pathway in polarized MDCK cells. Biol Chem 2009; 390:551-6. [PMID: 19453277 DOI: 10.1515/bc.2009.088] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
MUC1 is a heavily glycosylated transmembrane protein localized at the apical surface of polarized epithelial cells. Here, we examined the biosynthetic route of newly synthesized MUC1 in polarized Madin-Darby canine kidney (MDCK) cells. Apically and basolaterally destined cargo are sorted at the trans-Golgi network into distinct vesicles, and proteins with lipid raft-dependent apical targeting signals and glycan-dependent apical targeting signals appear to specifically transit apical early endosomes (AEEs) and apical recycling endosomes (AREs), respectively. Using metabolic labeling we found that MUC1 is efficiently targeted to the apical surface of polarized MDCK cells with a t(1/2) of 45 min. Apical delivery was not altered by inactivation of AEEs by treatment with hydrogen peroxide and diaminobenzidine treatment after apical loading of endosomes with horseradish peroxidase-conjugated wheat germ agglutinin. However, expression of a GFP-tagged myosin Vb tail fragment (GFP-MyoVbT) that disrupts export from the ARE significantly reduced MUC1 apical expression. Moreover, MUC1 expressed for brief periods in MDCK cells co-localized with GFP-MyoVbT. We conclude that MUC1 traffics to the apical surface via AREs in polarized renal epithelial cells.
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Affiliation(s)
- Polly E Mattila
- Department of Medicine, Renal-Electrolyte Division, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA
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The secretion inhibitor Exo2 perturbs trafficking of Shiga toxin between endosomes and the trans-Golgi network. Biochem J 2008; 414:471-84. [PMID: 18522538 PMCID: PMC2552392 DOI: 10.1042/bj20080149] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The small-molecule inhibitor Exo2 {4-hydroxy-3-methoxy-(5,6,7,8-tetrahydrol[1]benzothieno[2,3-d]pyrimidin-4-yl)hydraz-one benzaldehyde} has been reported to disrupt the Golgi apparatus completely and to stimulate Golgi–ER (endoplasmic reticulum) fusion in mammalian cells, akin to the well-characterized fungal toxin BFA (brefeldin A). It has also been reported that Exo2 does not affect the integrity of the TGN (trans-Golgi network), or the direct retrograde trafficking of the glycolipid-binding cholera toxin from the TGN to the ER lumen. We have examined the effects of BFA and Exo2, and found that both compounds are indistinguishable in their inhibition of anterograde transport and that both reagents significantly disrupt the morphology of the TGN in HeLa and in BS-C-1 cells. However, Exo2, unlike BFA, does not induce tubulation and merging of the TGN and endosomal compartments. Furthermore, and in contrast with its effects on cholera toxin, Exo2 significantly perturbs the delivery of Shiga toxin to the ER. Together, these results suggest that the likely target(s) of Exo2 operate at the level of the TGN, the Golgi and a subset of early endosomes, and thus Exo2 provides a more selective tool than BFA for examining membrane trafficking in mammalian cells.
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Du HL, Chen J, Zhang YS, Zhang XQ. Molecular cloning, mapping, and polymorphism of the porcine SCG2 gene. Biochem Genet 2008; 46:369-79. [PMID: 18278550 DOI: 10.1007/s10528-008-9153-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2007] [Accepted: 10/12/2007] [Indexed: 10/22/2022]
Abstract
The secretogranin II (SCG2) gene is associated with the synthesis and secretion of follicle-stimulating hormone and luteinizing hormone. In the present study, we have determined the complete cDNA sequence of pig SCG2, which was submitted to GenBank with accession no. AY870646. Its complete open reading frame of 1,851 nucleotides encodes 616 amino acids. The predicted protein shares 80-87% identity with mouse, human, and bovine SCG2 proteins, and all four species share almost complete identity in the secretoneurin and EM66 domains. Pig SCG2 is a protein of 589 amino acids and 68,132 Da, preceded by a signal peptide of 27 residues. It contains nine pairs of dibasic residues, which are used as potential cleavage sites for generation of physiologically active peptides. Analysis of the SCG2 gene across the INRA-Minnesota porcine radiation hybrid panel indicates close linkage with microsatellite marker SW2608, located on Sus scrofa chromosome 15 (SSC15) q25, which harbors several QTL for ovulation rate and meat quality. Comparative sequencing and EST analysis revealed nine SNPs in porcine SCG2 cDNA, including seven SNPs in the coding region and two SNPs in the 3' UTR. Four nonsynonymous SNPs (G622A, G1671T, C1718T, and A1790C) resulted in amino acid substitutions of Ala-->Thr, Glu-->Asp, Pro-->Leu, and Asn-->Thr, respectively.
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Affiliation(s)
- Hong-Li Du
- School of Bioscience and Bioengineering, South China University of Technology, Guangzhou 510640, P.R. China
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Ivanova JL, Leonova OG, Popenko VI, Ierusalimsky VN, Korshunova TA, Boguslavsky DV, Malyshev AY, Balaban PM, Belyavsky AV. Intracellular Localization of the HCS2 Gene Products in Identified Snail Neurons In Vivo and In Vitro. Cell Mol Neurobiol 2006; 26:127-44. [PMID: 16763780 DOI: 10.1007/s10571-006-9025-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2005] [Accepted: 01/20/2006] [Indexed: 11/29/2022]
Abstract
1. The HCS2 (Helix command specific 2) gene expressed in giant command neurons for withdrawal behavior of the terrestrial snail Helix lucorum encodes a unique hybrid precursor protein that contains a Ca-binding (EF-hand motif) protein and four small peptides (CNP1-CNP4) with similar Tyr-Pro-Arg-X aminoacid sequence at the C terminus. Previous studies suggest that under conditions of increased intracellular Ca(2+) concentration the HCS2 peptide precursor may be cleaved, and small physiologically active peptides transported to the release sites. In the present paper, intracellular localization of putative peptide products of the HCS2-encoded precursor was studied immunocytochemically by means of light and electron microscopy. 2. Polyclonal antibodies against the CNP3 neuropeptide and a Ca-binding domain of the precursor protein were used for gold labeling of ultrathin sections of identified isolated neurons maintained in culture for several days, and in same identified neurons freshly isolated from the central nervous system. 3. In freshly isolated neurons, the gold particles were mainly localized over the cytoplasmic secretory granules, with the density of labeling for the CNP3 neuropeptide being two-fold higher than for the calcium-binding domain. In cultured neurons, both antibodies mostly labeled clusters of secretory granules in growth cones and neurites of the neuron. The density of labeling for cultured neurons was the same for both antibodies, and was two-fold higher than for the freshly isolated from the central nervous system neurons. 4. The immunogold particles were practically absent in the bodies of cultured neurons. 5. The data obtained conform to the suggestion that the HCS2 gene products are transported from the cell body to the regions of growth or release sites.
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Affiliation(s)
- J L Ivanova
- Engelhardt Institute of Molecular Biology, 32 Vavilov Str., Moscow, 119991, Russia
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Peinado JR, Vazquez-Martinez R, Cruz-García D, Ruiz-Navarro A, Anouar Y, Tonon MC, Vaudry H, Gracia-Navarro F, Castano JP, Malagón MM. Differential expression and processing of chromogranin A and secretogranin II in relation to the secretory status of endocrine cells. Endocrinology 2006; 147:1408-18. [PMID: 16357044 DOI: 10.1210/en.2005-0975] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Chromogranin A (CgA) and secretogranin II (SgII) are neuroendocrine secretory proteins that participate in regulation of the secretory pathway and also serve as precursors of biologically active peptides. To investigate whether there is a relationship between the expression, distribution, and processing of CgA and SgII and the degree of secretory activity, we employed two melanotrope subpopulations of the pituitary intermediate lobe that exhibit opposite secretory phenotypes. Thus, although one of the melanotrope subtypes shows high secretory activity, the other exhibits characteristics of a hormone storage phenotype. Our data show that SgII expression levels were higher in secretory melanotropes, whereas CgA expression showed similar rates in both cell subsets. The use of various antibodies revealed the presence of the unprocessed proteins as well as three CgA-derived peptides (67, 45, and 30 kDa) and six SgII-derived peptides (81, 66, 55, 37, 32, and 30 kDa) in both subpopulations. However, the smallest molecular forms of both granins predominated in secretory melanotropes, whereas the largest SgII- and CgA-immunoreactive peptides were more abundant in storage melanotropes, which is suggestive of a more extensive processing of granins in the secretory subset. Confocal microscopy studies showed that CgA immunoreactivity was higher in storage cells, but SgII immunoreactivity was higher in secretory melanotropes. Taken together, our results indicate that SgII and CgA are differentially regulated in melanotrope subpopulations. Thus, SgII expression is strongly related to the secretory activity of melanotrope cells, whereas CgA expression may not be related to secretory rate, but, rather, to hormone storage in this endocrine cell type.
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Affiliation(s)
- J R Peinado
- Department of Cell Biology, Physiology, and Immunology, Campus de Rabanales. Edificio Severo Ochoa, Planta 3, University of Cordoba, E-14014 Cordoba, Spain
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Kinlough CL, McMahan RJ, Poland PA, Bruns JB, Harkleroad KL, Stremple RJ, Kashlan OB, Weixel KM, Weisz OA, Hughey RP. Recycling of MUC1 is dependent on its palmitoylation. J Biol Chem 2006; 281:12112-22. [PMID: 16507569 DOI: 10.1074/jbc.m512996200] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
MUC1 is a mucin-like transmembrane protein expressed on the apical surface of epithelia, where it protects the cell surface. The cytoplasmic domain has numerous sites for phosphorylation and docking of proteins involved in signal transduction. In a previous study, we showed that the cytoplasmic YXXphi motif Y20HPM and the tyrosine-phosphorylated Y60TNP motif are required for MUC1 clathrin-mediated endocytosis through binding AP-2 and Grb2, respectively (Kinlough, C. L., Poland, P. A., Bruns, J. B., Harkleroad, K. L., and Hughey, R. P. (2004) J. Biol. Chem. 279, 53071-53077). Palmitoylation of transmembrane proteins can affect their membrane trafficking, and the MUC1 sequence CQC3RRK at the boundary of the transmembrane and cytoplasmic domains mimics reported site(s) of S-palmitoylation. [3H]Palmitate labeling of Chinese hamster ovary cells expressing MUC1 with mutations in CQC3RRK revealed that MUC1 is dually palmitoylated at the CQC motif independent of RRK. Lack of palmitoylation did not affect the cold detergent solubility profile of a chimera (Tac ectodomain and MUC1 transmembrane and cytoplasmic domains), the rate of chimera delivery to the cell surface, or its half-life. Calculation of rate constants for membrane trafficking of wild-type and mutant Tac-MUC1 indicated that the lack of palmitoylation blocked recycling, but not endocytosis, and caused the chimera to accumulate in a EGFP-Rab11-positive endosomal compartment. Mutations CQC/AQA and Y20N inhibited Tac-MUC1 co-immunoprecipitation with AP-1, although mutant Y20N had reduced rates of both endocytosis and recycling, but a normal subcellular distribution. The double mutant chimera AQA+Y20N had reduced endocytosis and recycling rates and accumulated in EGFP-Rab11-positive endosomes, indicating that palmitoylation is the dominant feature modulating MUC1 recycling from endosomes back to the plasma membrane.
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Affiliation(s)
- Carol L Kinlough
- Laboratory of Epithelial Cell Biology, Department of Medicine, Renal-Electrolyte Division, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, USA
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Winsky-Sommerer R, Benjannet S, Rov�re C, Barbero P, Seidah NG, Epelbaum J, Dournaud P. Regional and cellular localization of the neuroendocrine prohormone convertases PC1 and PC2 in the rat central nervous system. J Comp Neurol 2000. [DOI: 10.1002/1096-9861(20000828)424:3<439::aid-cne4>3.0.co;2-1] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Abstract
Secretogranin II (SgII) is a sulphated secretory protein found in a broad variety of neuroendocrine cells. We have raised an antiserum against SgII to monitor its fate in Xenopus intermediate pituitary. Pulse-chase incubations in combination with immunoprecipitation analysis showed that SgII was synthesised as an 84-kDa precursor protein which was processed to fragments of 69, 54, 34, 21 and 15 kDa. Secretion of these cleavage products was sensitive to the dopamine D2 receptor agonist apomorphine, and thus occurred via the regulated secretory pathway. When cells were treated with the fungal metabolite brefeldin A or with the specific vacuolar H+-ATPase inhibitor bafilomycin A1, the processing of SgII and the release of its cleavage products were strongly inhibited, indicating that its processing commenced in the later compartments of the secretory pathway. Pulse-chase and immunoblot analysis showed that the 21-kDa fragment was the major SgII-derived cleavage and release product, and carried secretoneurin, a highly conserved peptide flanked by potential dibasic processing sites. Hence, SgII is cleaved to a variety of products that are released via the regulated secretory pathway, while secretoneurin does not seem to represent a major end-product of SgII processing in Xenopus intermediate pituitary.
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Affiliation(s)
- A M Van Horssen
- Department of Animal Physiology, University of Nijmegen, The Netherlands
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Robin P, Rossignol B, Raymond MN. PKA inhibitor, H-89, affects the intracellular transit of regulated secretory proteins in rat lacrimal glands. THE AMERICAN JOURNAL OF PHYSIOLOGY 1998; 274:C262-71. [PMID: 9458736 DOI: 10.1152/ajpcell.1998.274.1.c262] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
We tested the effect of H-89, a protein kinase A (PKA) inhibitor, on the intracellular transit of the regulated secretory proteins in rat lacrimal glands. We show that H-89, by itself, induces the secretion of newly synthesized proteins trafficking in its presence but not of proteins already stored in the mature secretory granules. This secretion does not depend on the presence of extracellular Ca2+. The proteins released are identical to those secreted after cholinergic stimulation or under the action of the ionophore A-23187, but the secretion level is approximately 40% lower. The effect of H-89 seems to be due to PKA inhibition because other protein kinase inhibitors (calphostin C, chelerythrine, H-85) do not induce secretion. We further show that H-89 does not modify the rate of glycoprotein galactosylation but induces the secretion of newly galactosylated glycoproteins. Finally, we used a "20 degrees C block" procedure to show that H-89 affects a trans-Golgi network (TGN) or post-TGN step of the secretory pathway. Our results demonstrate that, in lacrimal cells, H-89 affects the intracellular trafficking of secretory proteins, suggesting a role for PKA in this process.
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Affiliation(s)
- P Robin
- Laboratoire de Biochimie des Transports Cellulaires, Centre National de la Recherche Scientifique, ERS 0571, Université Paris XI, Orsay, France
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Muller L, Picart R, Barret A, Seidah NG, Tougard C. Immunocytochemical localization of the prohormone convertases PC1 and PC2 in rat prolactin cells. J Histochem Cytochem 1998; 46:101-8. [PMID: 9405499 DOI: 10.1177/002215549804600113] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
The prohormone convertases PC1 and PC2 are subtilisin-related endopeptidases that process prohormone and neuropeptide precursors. Using different ultrastructural immunocytochemical approaches, we have investigated their intracellular distribution in a neuroendocrine cell type that has not been examined thus far, the rat anterior pituitary lactotrope. These cells secrete mainly prolactin and also express the neuroendocrine-specific protein secretogranin II, which is considered a peptide precursor. Our study provides evidence for the expression of PC1 and PC2 in rat lactotropes and provides new information on their subcellular localization. Apart from their presence in the secretory granules, PC1 and PC2 displayed different major localization along the secretory pathway. PC1 immunoreactivity was concentrated in the Golgi apparatus, whereas PC2 immunoreactivity was prominent in the rough endoplasmic reticulum (RER). These observations provide morphological support for previous biochemical analysis of proPC1 and proPC2 post-translational processing, which has demonstrated that PC1 exits very rapidly from the RER, whereas PC2 is retained much longer in this compartment. (J Histochem Cytochem 46:101-108, 1998)
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Affiliation(s)
- L Muller
- Groupe de Biologie de la Cellule Neuroendocrine, INSERM U36, Collège de France, Paris, France
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