Abstract:
:A role of the epidermal growth factor receptor (EGFR) family has been suggested in colon cancer etiology, progression, and/or severity. Our recently identified pan-erbB inhibitor EGFR-related protein (ERRP) targets EGFRs by attenuating their activation and subsequent signaling leading to cellular growth inhibition. In the present study, we evaluated the therapeutic effectiveness of ERRP on early and intermediate stages of colon cancer by examining regression of chemically induced aberrant crypt foci (ACF) in the colon of CF1 mice and intestinal adenomas in APC(Min+/-) (Min) mice. After formation of ACF or adenomas, the mice were injected (i.p.) with ERRP (50 microg/mouse) for 10 consecutive days. This treatment significantly reduced the number of ACF from 25.0 +/- 3.0 (controls) to 14.9 +/- 1.6 (ERRP-treated; P = 0.011) and also reduced their size (P < 0.01). In Min mice, ERRP caused the regression of adenomas throughout the small intestine (P < 0.05) and reduced their size (P < 0.001). This could partly be attributed to inhibition of proliferation and stimulation of apoptosis in the intestinal mucosa and was associated with decreased activation of several EGFR family members, suppression of downstream effector nuclear factor kappaB and down-regulation of cyclooxygenase-2. ERRP-induced attenuation of EGFR activation could be due to increased sequestration of the ligand(s) by ERRP, rendering them unavailable for binding to and activation of the receptor. In conclusion, our data show that ERRP is effective in regressing both early and intermediate intestinal lesions and could be an effective therapeutic agent for colon cancer.
journal_name
Cancer Resjournal_title
Cancer researchauthors
Schmelz EM,Xu H,Sengupta R,Du J,Banerjee S,Sarkar FH,Rishi AK,Majumdar APdoi
10.1158/0008-5472.CAN-07-0536subject
Has Abstractpub_date
2007-06-01 00:00:00pages
5389-96issue
11eissn
0008-5472issn
1538-7445pii
67/11/5389journal_volume
67pub_type
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