{"id":11144,"date":"2009-11-16T00:00:00","date_gmt":"2009-11-16T00:00:00","guid":{"rendered":"https:\/\/www.cancerresearch.org\/media-room\/targeting-normal-cells-in-tumors-slows-cancer-growth\/"},"modified":"2022-07-13T05:17:53","modified_gmt":"2022-07-13T05:17:53","slug":"targeting-normal-cells-in-tumors-slows-growth","status":"publish","type":"cri_news","link":"https:\/\/www.cancerresearch.org\/es\/media-room\/targeting-normal-cells-in-tumors-slows-growth","title":{"rendered":"Targeting Normal Cells in Tumors Slows Cancer Growth"},"content":{"rendered":"\n

Targeting the normal cells that surround cancer cells within and around a tumor is a strategy that could greatly increase the effectiveness of traditional anti-cancer treatments, say\u00a0CRI-funded researchers and their colleagues at The Wistar Institute in Philadelphia, PA.<\/p>\n\n\n\n

In the Journal of Clinical Investigation<\/a> published online November 16, they demonstrate the critical role for fibroblast activation protein (FAP), expressed by one type of these so-called \u201cstromal\u201d cells, in promoting tumor growth in mice. Genetically deleting or therapeutically targeting FAP significantly reduced the rate of tumor growth in mice by interrupting or blocking important signaling pathways and biological processes required for tumor growth, the Wistar team found.<\/p>\n\n\n\n

\u201cIt\u2019s like taking away the soil from a seed that wants to grow,\u201d says senior author Ellen Pur\u00e9, PhD, a professor in the Molecular and Cellular Oncogenesis Program at Wistar.1<\/sup> \u201cThese results provide a proof-of-principle that targeting and modifying a tumor\u2019s microenvironment may be an effective approach to treating solid tumors.\u201d<\/p>\n\n\n\n

Tumors are a complex mix of neoplastic cancer cells and normal cells \u2013 inflammatory and immune cells, endothelial cells, fibroblasts, pericytes, and others, collectively known as stromal cells. In addition, a web-like extracellular matrix is created by the stromal cells, and its structure is important for supporting and nurturing tumor growth through molecular signaling pathways.<\/p>\n\n\n\n

The Wistar team focused on fibroblasts and pericytes. In addition to synthesizing components of the extracellular matrix, fibroblasts associated with tumors also express FAP, a particular protease that cuts up other proteins while pericytes are important to the function of the new blood vessels that develop in tumors. FAP is expressed in 90 percent of all human epithelial (solid) cancers, and FAP expression is recognized as a marker for and is thought to play a role in cancer growth, but the mechanisms through which this occurs had been previously unknown.<\/p>\n\n\n\n

\u201cOur data clearly demonstrate that FAP indeed promotes the growth of colon cancer as well as lung cancer in animal models, and provide insight into how FAP works,\u201d says Pur\u00e9. To explore how FAP promotes tumor growth, lead author Ang\u00e9lica Santos, PhD,2<\/sup> and colleagues took two approaches \u2013 genetic deletion and pharmacologic targeting of FAP to determine the effects of deactivating FAP in mouse models of lung and colon cancer.<\/p>\n\n\n\n

First, they examined the genetic deletion of FAP.  In collaboration with Wistar assistant professor and co-author Joseph Kissil, PhD, they mated mice engineered to spontaneously develop lung cancer when their K-Ras gene is activated with mice whose FAP gene had been deleted to develop a new strain of mice with a genetic deletion of FAP and expressing an activated K-Ras gene.<\/p>\n\n\n\n

The Wistar team found that lung tumor growth was substantially inhibited in these mice.  In another experiment the investigators transplanted colon cancer cells into FAP-deficient mice and saw a similarly marked inhibition of tumor growth.<\/p>\n\n\n\n

\u201cWe found that FAP inactivation disrupts the organization of the collagen fibers which are a key component of matrix and that could be critical for many things, including cell to cell communication, cell-matrix interactions and development of new blood vessels to feed the tumors,\u201d Pur\u00e9 says. \u201cThe organization or architecture of the matrix is important to supporting both stromal and cancer cells within a tumor. If stromal cells depend on this matrix for structural support and to communicate with the cancer, they can\u2019t do that properly if it is drastically modified as we observed in the absence of FAP activity. \u201d<\/p>\n\n\n\n

To explore the potential for a therapeutic approach, the investigators used a novel peptide agent, PT630, to shut down FAP activation in the lung and colon cancer mice. Again, they found a significant reduction in tumor growth by inhibiting the enzymatic activity of FAP with this candidate drug agent.<\/p>\n\n\n\n

\u201cThis proof of concept is the first step toward the clinic,\u201d Pur\u00e9 says. \u201cWe need more drugs that target the non-cancer cells in tumors, which can then be combined with specific chemotherapies and biologic drugs to attack both the tumor and its supporting cells.\u201d<\/p>\n\n\n\n

One of the benefits of such a strategy, Pur\u00e9 adds, is that a limited number of agents would likely be required to treat many different cancers, because stromal cells tend to have common properties and share expression of the FAP protein in most tumor types. Comparatively, targeted therapies designed for specific tumor types \u2013 such as breast or colon \u2013 will likely require a wide variety of different drugs.<\/p>\n\n\n\n

The only agents currently used to treat cancer by targeting the tumor microenvironment are anti-angiogenesis drugs, like Avastin, which disrupt blood vessel formation to tumors.<\/p>\n\n\n\n

The study was funded by grants from the National Institutes of Health, the Pennsylvania Department of Health, the Cancer Research Institute<\/strong>, the Ludwig Institute for Cancer Research and a Wistar Cancer Training Grant. Agents used in the study were provided by Point Therapeutics. The authors declare no conflict of interest.<\/p>\n\n\n\n

Source: The Wistar Institute www.wistar.org<\/a><\/p>\n\n\n\n

Notes<\/strong>
1<\/sup> Dr. Ellen Pur\u00e9 is an associate director of the Cancer Research Institute Scientific Advisory Council.
2<\/sup> Dr. Ang\u00e9lica Santos conducted this work while receiving postdoctoral fellowship support through the Irvington Institute Fellowship Program of the Cancer Research Institute.<\/p>\n\n\n\n\n

Reference: Santos A.M. et al. Targeting fibroblast activation protein inhibits tumor stromagenesis and growth in mice. J. Clin. Invest.<\/em> 16 Nov. 2009 doi:10.1172\/JCI38988.<\/p>\n\n","protected":false},"excerpt":{"rendered":"

CRI-funded scientists and their colleagues demonstrate that targeting normal cells that surround cancer cells within and around a tumor is a strategy that could greatly increase the effectiveness of traditional anti-cancer treatments.<\/p>\n","protected":false},"featured_media":3691,"template":"","tags":[109],"resource_cancer_types":[],"resource_patient_age":[],"resource_cancer_stage":[],"resource_treatment_type":[],"resource_treatment_status":[],"class_list":["post-11144","cri_news","type-cri_news","status-publish","has-post-thumbnail","hentry","tag-research"],"acf":[],"yoast_head":"\nTargeting Normal Cells in Tumors Slows Cancer Growth - Cancer Research Institute<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.cancerresearch.org\/media-room\/targeting-normal-cells-in-tumors-slows-growth\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Targeting Normal Cells in Tumors Slows Cancer Growth - 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