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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Skobe, M. Fusenig, N. E. |
| Description | Author Affiliation: Skobe M ( Division of Carcinogenesis and Differentiation, German Cancer Research Center (DKFZ), Im Neuenheimer Feld 280, 69120 Heidelberg, Germany.); |
| Abstract | The stromal microenvironment plays a crucial role in tumor development and progression. One of the most potent activators of stromal cells is the platelet-derived growth factor (PDGF). To investigate the role of PDGF in epithelial tumor development we stably transfected immortal nontumorigenic human keratinocytes with the PDGF-B cDNA. Transfected HaCaT cells overexpressed PDGF-B but remained negative for the PDGF receptors alpha and beta (mRNA). Thus, they did not exhibit autocrine growth stimulation in vitro, but proliferation of cocultured fibroblasts was enhanced and this effect was inhibited by a neutralizing antibody to PDGF-BB. After subcutaneous injection into nude mice the transfected cells maintained high PDGF expression and formed progressively enlarging, rapidly proliferating cysts, classified as benign tumors. During early tumor development (up to 2 months), PDGF-B transfectants induced marked mesenchymal cell proliferation and angiogenesis, yet this effect vanished at later stages (2-6 months) concomitantly with increased epithelial cell proliferation and enhanced tumor growth. These results demonstrate that an activated stromal environment can promote tumorigenic conversion of nontumorigenic keratinocytes by inducing sustained epithelial hyperproliferation. This effect is apparently caused by a dual action of PDGF-BB: (i) PDGF-BB can promote tumor growth by inducing angiogenesis and stroma formation, and (ii) PDGF-activated stromal cells maintain elevated keratinocyte proliferation via a paracrine mechanism. Thus, PDGF, a major factor activated in wound healing, may play an important role as an endogenous promoter in epithelial tumor formation. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 3 |
| Volume Number | 95 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1998-03-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Cell Transformation, Neoplastic Keratinocytes Physiology Stromal Cells Animals Cell Division Drug Effects Cell Line Coculture Techniques Fibroblasts Cytology Mice Platelet-Derived Growth Factor Genetics Pharmacology Proto-Oncogene Proteins C-sis Skin Neoplasms Etiology Pathology Transfection Research Support, Non-U.S. Gov't Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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