Epidermal growth factor receptor signaling is up-regulated in human colonic aberrant crypt foci

Greg Cohen, Reba Mustafi, Anusara Chumsangsri, Nathaniel Little, Jeff Nathanson, Sonia Cerda, Sujatha Jagadeeswaran, Urszula Dougherty, Loren Joseph, John Hart, Lisa Yerian, Maria Tretiakova, Weihua Yuan, Piotr Obara, Sharad Khare, Frank A Sinicrope, Alessandro Fichera, Gerry R. Boss, Robert Carroll, Marc Bissonnette

Research output: Contribution to journalArticle

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Abstract

Aberrant crypt foci (ACF) are collections of abnormal colonic crypts with heterogeneous molecular and pathologic characteristics. Large and dysplastic ACF are putative precursors of colon cancer with neoplastic risk related to increased proliferation. In this study, we examined the role of epidermal growth factor receptor (EGFR) signaling in regulating ACF proliferation. Using magnification chromoendoscopy, we collected large ACF with endoscopic features of dysplasia and separately biopsied adjacent mucosa. Transcript levels were measured by real-time PCR, proteins were assessed by Western blotting, and levels were expressed as fold changes of adjacent mucosa. K-ras and B-Raf mutations were assessed by PCR and Ras activation by the ratio Ras-GTP/(Ras-GTP + Ras-GDP). At the RNA level, 38% of ACF were hyperproliferative, with proliferating cell nuclear antigen (PCNA) mRNA ≥2-fold of adjacent mucosa. Hyperproliferative ACF had significantly increased mRNA levels of EGFR (6.0 ± 1.7-fold), transforming growth factor-α (14.4 ± 5.0-fold), heparin-binding EGF-like growth factor (4.5 ± 1.4- fold), cyclin D1 (4.6 ± 0.7-fold), and cyclooxygenase-2 (COX-2; 9.3 ± 4.2-fold; P < 0.05). At the protein level, 46% of ACF were hyperproliferative (PCNA, 3.2 ± 1.2-fold). In hyperproliferative ACF, 44% possessed significant increases in four EGFR signaling components: EGFR (9.5 ± 1.3-fold), phosphoactive ErbB2 (2.6 ± 0.4-fold), phosphoactive extracellular signal-regulated kinase (3.7 ± 1.1-fold), and cyclin D1 (3.4 ± 0.8-fold; P < 0.05). Ras was activated in 46% of ACF (3.2 ± 0.4-fold; P < 0.05), but K-ras mutations were present in only 7% of ACF. In contrast to COX-2 mRNA, the protein was not increased in hyperproliferative ACF. In summary, we have shown that ACF with up-regulated PCNA possess increased EGFR signaling components that likely contribute to the enhanced proliferative state of dysplastic-appearing ACF.

Original languageEnglish (US)
Pages (from-to)5656-5664
Number of pages9
JournalCancer Research
Volume66
Issue number11
DOIs
StatePublished - Jun 1 2006

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Aberrant Crypt Foci
Epidermal Growth Factor Receptor
Proliferating Cell Nuclear Antigen
Mucous Membrane
Cyclin D1
Messenger RNA
Mutation
Proteins
Extracellular Signal-Regulated MAP Kinases
Transforming Growth Factors
Cyclooxygenase 2
Guanosine Triphosphate
Colonic Neoplasms

ASJC Scopus subject areas

  • Cancer Research
  • Oncology

Cite this

Cohen, G., Mustafi, R., Chumsangsri, A., Little, N., Nathanson, J., Cerda, S., ... Bissonnette, M. (2006). Epidermal growth factor receptor signaling is up-regulated in human colonic aberrant crypt foci. Cancer Research, 66(11), 5656-5664. https://doi.org/10.1158/0008-5472.CAN-05-0308

Epidermal growth factor receptor signaling is up-regulated in human colonic aberrant crypt foci. / Cohen, Greg; Mustafi, Reba; Chumsangsri, Anusara; Little, Nathaniel; Nathanson, Jeff; Cerda, Sonia; Jagadeeswaran, Sujatha; Dougherty, Urszula; Joseph, Loren; Hart, John; Yerian, Lisa; Tretiakova, Maria; Yuan, Weihua; Obara, Piotr; Khare, Sharad; Sinicrope, Frank A; Fichera, Alessandro; Boss, Gerry R.; Carroll, Robert; Bissonnette, Marc.

In: Cancer Research, Vol. 66, No. 11, 01.06.2006, p. 5656-5664.

Research output: Contribution to journalArticle

Cohen, G, Mustafi, R, Chumsangsri, A, Little, N, Nathanson, J, Cerda, S, Jagadeeswaran, S, Dougherty, U, Joseph, L, Hart, J, Yerian, L, Tretiakova, M, Yuan, W, Obara, P, Khare, S, Sinicrope, FA, Fichera, A, Boss, GR, Carroll, R & Bissonnette, M 2006, 'Epidermal growth factor receptor signaling is up-regulated in human colonic aberrant crypt foci', Cancer Research, vol. 66, no. 11, pp. 5656-5664. https://doi.org/10.1158/0008-5472.CAN-05-0308
Cohen G, Mustafi R, Chumsangsri A, Little N, Nathanson J, Cerda S et al. Epidermal growth factor receptor signaling is up-regulated in human colonic aberrant crypt foci. Cancer Research. 2006 Jun 1;66(11):5656-5664. https://doi.org/10.1158/0008-5472.CAN-05-0308
Cohen, Greg ; Mustafi, Reba ; Chumsangsri, Anusara ; Little, Nathaniel ; Nathanson, Jeff ; Cerda, Sonia ; Jagadeeswaran, Sujatha ; Dougherty, Urszula ; Joseph, Loren ; Hart, John ; Yerian, Lisa ; Tretiakova, Maria ; Yuan, Weihua ; Obara, Piotr ; Khare, Sharad ; Sinicrope, Frank A ; Fichera, Alessandro ; Boss, Gerry R. ; Carroll, Robert ; Bissonnette, Marc. / Epidermal growth factor receptor signaling is up-regulated in human colonic aberrant crypt foci. In: Cancer Research. 2006 ; Vol. 66, No. 11. pp. 5656-5664.
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AU - Cohen, Greg

AU - Mustafi, Reba

AU - Chumsangsri, Anusara

AU - Little, Nathaniel

AU - Nathanson, Jeff

AU - Cerda, Sonia

AU - Jagadeeswaran, Sujatha

AU - Dougherty, Urszula

AU - Joseph, Loren

AU - Hart, John

AU - Yerian, Lisa

AU - Tretiakova, Maria

AU - Yuan, Weihua

AU - Obara, Piotr

AU - Khare, Sharad

AU - Sinicrope, Frank A

AU - Fichera, Alessandro

AU - Boss, Gerry R.

AU - Carroll, Robert

AU - Bissonnette, Marc

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N2 - Aberrant crypt foci (ACF) are collections of abnormal colonic crypts with heterogeneous molecular and pathologic characteristics. Large and dysplastic ACF are putative precursors of colon cancer with neoplastic risk related to increased proliferation. In this study, we examined the role of epidermal growth factor receptor (EGFR) signaling in regulating ACF proliferation. Using magnification chromoendoscopy, we collected large ACF with endoscopic features of dysplasia and separately biopsied adjacent mucosa. Transcript levels were measured by real-time PCR, proteins were assessed by Western blotting, and levels were expressed as fold changes of adjacent mucosa. K-ras and B-Raf mutations were assessed by PCR and Ras activation by the ratio Ras-GTP/(Ras-GTP + Ras-GDP). At the RNA level, 38% of ACF were hyperproliferative, with proliferating cell nuclear antigen (PCNA) mRNA ≥2-fold of adjacent mucosa. Hyperproliferative ACF had significantly increased mRNA levels of EGFR (6.0 ± 1.7-fold), transforming growth factor-α (14.4 ± 5.0-fold), heparin-binding EGF-like growth factor (4.5 ± 1.4- fold), cyclin D1 (4.6 ± 0.7-fold), and cyclooxygenase-2 (COX-2; 9.3 ± 4.2-fold; P < 0.05). At the protein level, 46% of ACF were hyperproliferative (PCNA, 3.2 ± 1.2-fold). In hyperproliferative ACF, 44% possessed significant increases in four EGFR signaling components: EGFR (9.5 ± 1.3-fold), phosphoactive ErbB2 (2.6 ± 0.4-fold), phosphoactive extracellular signal-regulated kinase (3.7 ± 1.1-fold), and cyclin D1 (3.4 ± 0.8-fold; P < 0.05). Ras was activated in 46% of ACF (3.2 ± 0.4-fold; P < 0.05), but K-ras mutations were present in only 7% of ACF. In contrast to COX-2 mRNA, the protein was not increased in hyperproliferative ACF. In summary, we have shown that ACF with up-regulated PCNA possess increased EGFR signaling components that likely contribute to the enhanced proliferative state of dysplastic-appearing ACF.

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