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      Call for Papers: Green Renal Replacement Therapy: Caring for the Environment

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      About Blood Purification: 3.0 Impact Factor I 5.6 CiteScore I 0.83 Scimago Journal & Country Rank (SJR)

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      C-Type natriuretic peptide inhibits proliferation and monocyte chemoattractant protein-1 secretion in cultured human mesangial cells.

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          Abstract

          Mesangial cell proliferation and matrix accumulation are hallmarks of various progressive glomerular diseases. We examined whether C-type natriuretic peptide (CNP) that is known to regulate the proliferation of vascular smooth muscle cells could modulate these pathological processes using human glomerular mesangial cells (GMCs) in culture.

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          Activation of MCP-1 gene expression is mediated through multiple signaling pathways.

          P Kolattukudy, Yu Li, John Y-J Shyy (1993)
          Multiple signal transduction pathways including protein kinase C, tyrosine phosphorylation, and an independent third signaling mechanism are involved in the activation of monocyte chemotactic protein-1 gene. Northern blot analysis showed that the incubation of endothelial cell with dioctanoylglycerol induced maximum level of monocyte chemotactic protein-1 transcripts. The TPA-induced monocyte chemotactic protein-1 expression was abolished by treating the cells with both staurosporine and genistein; however, only a portion of the LPS-induced expression was inhibited by staurosporine/genistein. This is in accordance with the observation that LPS induced the expression of monocyte chemotactic protein-1 in desensitized cells. Thus, a third signal transduction pathway other than protein kinase C or tyrosine kinase is involved in the LPS-induced monocyte chemotactic protein-1 expression in human endothelial cell.
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            C-type natriuretic peptide inhibits mesangial cell proliferation and matrix accumulation in vivo

            Sima Canaan-Kühl, Tammo Ostendorf, Kerstin K. Zander … (1998)
            Local C-type natriuretic peptide (CNP) production and CNP receptor expression have been demonstrated in glomeruli. However, the glomerular (patho-)physiological functions of CNP are largely unknown. We therefore investigated the effects of CNP on mesangial cell proliferation and matrix accumulation in the rat mesangioproliferative anti-Thy 1.1 model. Over seven days rats received a continuous infusion (1 microgram/kg/min) of either CNP (N = 6), an irrelevant control peptide (N = 3) or buffer alone (N = 6). Kidney biopsies were performed on days 2, 4 and 8. Few significant differences between the groups were noted on days 2 and 4. Compared to buffer treated rats on day 8, those receiving CNP showed a 35% reduction of glomerular mitoses, a 62% reduction of glomerular uptake of the thymidine analogue BrdU and a significant reduction in glomerular expression of PDGF B-chain. Double immunoperoxidase staining also revealed blunting of proliferating, activated mesangial cells (515 reduction of alpha-smooth muscle actin-/BrdU-positive cells) and macrophage influx. Moreover, there was a marked reduction of mesangial collagen IV and fibronectin accumulation at the protein and mRNA level. Rats receiving the control peptide were indistinguishable from buffer treated rats. Systemic blood pressure was reduced by 10 to 20% in both CNP and control peptide treated rats on day 8, excluding that the findings were due to hemodynamic effects of CNP. Our findings demonstrate that CNP is involved in the regulation of mesangial cell proliferation and matrix production in vivo. The data suggest the existence of a glomerular natriuretic peptide system that may regulate tissue homeostasis and contribute to resolution of mesangioproliferative diseases.
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              Platelet-derived growth factor-stimulated secretion of basement membrane proteins by skeletal muscle occurs by tyrosine kinase-dependent and -independent pathways.

              D E Albrecht, J G Tidball (1997)
              The basement membrane of skeletal muscle is produced by the muscle cells it ensheathes and by nonmuscle cells located in the surrounding extracellular matrix. In this study, we have shown that platelet-derived growth factor (PDGF) stimulates secretion of three basement membrane components of skeletal muscle: laminin (70% increase), fibronectin (30%), and type IV collagen (70%). Furthermore, we have found using the signal transduction inhibitors, genistein (tyrosine kinase inhibitor), phorbol 12-myristate 13-acetate (protein kinase C (PKC) inhibitor), thapsigargin (depletes intracellular Ca2+ stores), and H89 (protein kinase A inhibitor), that PDGF-stimulated secretion of these proteins occurs through distinct signaling pathways. Densitometry of Western blots of L6 myoblast supernatant indicates that the PDGF-induced increase in secretion of laminin and type IV collagen is tyrosine kinase-dependent. The increase in type IV collagen secretion also shows dependence on PKC, as well as the release of intracellular Ca2+. Inhibition of either of these pathways reduces the increase in type IV collagen secretion to 20%. In contrast, the PDGF-induced increase in laminin secretion is unaffected by inhibition of either PKC or intracellular Ca2+ release. The increase in fibronectin secretion by PDGF uses yet a third set of signals. PDGF-induced fibronectin secretion is not dependent on tyrosine kinase activity but is dependent on protein kinase A as well as the release of intracellular Ca2+. These divergent signaling pathways provide for independent regulation of basement membrane protein secretion, allowing a muscle cell to modify both the quantity and composition of its basement membrane in response to its environment.
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                Author and article information

                Journal
                Journal ID (iso-abbrev): Nephron
                Title: Nephron
                Publisher: S. Karger AG
                ISSN: 1660-8151
                ISSN (Print): 1660-8151
                Publication date (Electronic): Dec 2000
                Volume: 86
                Issue: 4
                Affiliations
                [1 ] Second Department of Internal Medicine, Hirosaki University School of Medicine, Hirosaki, Japan. osawa@cc.hirosaki-u.ac.jp
                Article
                Publisher Item ID: 45836
                DOI: 10.1159/000045836
                PubMed ID: 11124596
                SO-VID: ee1fded6-7bc3-4e64-a2ce-570c3d7975be
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