Medicine and Health Sciences Commons^™

Identifying Protein Kinase Tbk1 As A Novel Inhibitor Of Intestinal Tumorigenesis, Amber L. Mathews

Dissertations & Theses (Open Access)

Colorectal cancer (CRC) is the third most common cancer diagnosed in women and men， causing almost 600,000 annual deaths worldwide. There is a clear need to understand how CRC forms and progresses in order to improve the strategies of CRC prevention and therapy. A major factor that drives the development of CRC is genetic mutations that lead to activation of oncogenes and inactivation of tumor suppressor genes in intestinal epithelial cells (IECs). In addition, the initiation and progression of CRC involve environmental and immunological factors. In particular, chronic inflammatory conditions are known as an important risk factor for CRC. Intestinal …

A Cytosolic Multiprotein Complex Containing P85Α Is Required For Β-Catenin Activation In Colitis And Colitis-Associated Cancer, Tatiana Goretsky, Emily M. Bradford, Hyunji Ryu, Maryam Tahir, Mary Pat Moyer, Tianyan Gao, Linheng Li, Terrence A. Barrett

Internal Medicine Faculty Publications

Wnt/β-catenin signaling is required for crypt structure maintenance. We previously observed nuclear accumulation of Ser-552 phosphorylated β-catenin (pβ-Cat^Ser-552) in intestinal epithelial cells (IEC) during colitis and colitis-associated cancer. Data here delineate a novel multiprotein cytosolic complex (MCC) involved in β-catenin signaling in the intestine. The MCC contains p85α, the class IA subunit of PI3K, along with β-catenin, 14-3-3ζ, Akt, and p110α. MCC levels in IEC increase in colitis and colitis-associated cancer patients. IEC-specific p85α-deficient (p85^ΔIEC) mice develop more severe dextran sodium …

Do Patients Treated For Colorectal Cancer Benefit From General Practitioner Support? A Video Vignette Study, Irene Ngune, Moyez Jiwa, Alexandra Mcmanus, Richard Parsons, Georgina Pagey, Rupert Hodder

Research outputs 2014 to 2021

Background: Patients who have been treated for colorectal cancer in Australia can consult their general practitioner (GP) for advice about symptoms or side effects at any time following their treatment. However, there is no evidence that such patients are consistently advised by GPs, and patients experience substantial unmet need for reassurance and advice. Objective: To explore the patient management options selected by GPs to treat a set of patients describing their symptoms following treatment for colorectal cancer. Methods: This was an Internet-based survey. Participants (GPs) viewed 6 video vignettes of actors representing patients who had been treated for colorectal cancer. …

Promoting Colorectal Cancer Screening Among Haitian Americans, Steven S. Coughlin, Erica I. Lubetkin, Jennifer L. Hay, Renald Raphael, Selina A. Smith

Journal of the Georgia Public Health Association

Background: Few studies have examined colorectal cancer screening among Haitian Americans, although striking disparities in colorectal cancer screening and mortality are well-documented among U.S. Blacks. Race, socioeconomic status, and place of birth are factors associated with colorectal cancer incidence and mortality patterns.

Methods: In this article, we summarize published studies on colorectal cancer screening among Haitian Americans, identified through bibliographic searches in PubMed and CINAHL through August 2015, and offer recommendations for further research.

Results: Only one qualitative study and three quantitative surveys have examined colorectal cancer screening among Haitian Americans. A qualitative study found important differences in perceptions of …

Investigating The Interaction Of Aurka And Ube2c In Colorectal Cancer Cells, Apurva M. Hegde

Dissertations & Theses (Open Access)

Colorectal cancer (CRC) is the third leading cause of cancer-related deaths in the US. Among the many genomic aberrations previously implicated in colorectal cancer, recurrent amplification of chromosome 20q is frequently associated with liver metastasis. Previous research in our lab identified a gene signature on chromosome 20q associated with colorectal cancer progression. In this study, one of the genes in the signature, the ubiquitin conjugating enzyme UBE2C, was identified through preliminary bioinformatics analysis as a candidate for further examination of its role in CRC progression. Co-expression analysis of UBE2C in tumor-normal datasets from the public database Oncomine revealed all the …

Methylation Of Egfr By Arginine Methyltransferase Prmt1 Enhances Egfr Signaling And Cetuximab Resistance, Hsin-Wei Liao

Dissertations & Theses (Open Access)

Protein modifications of epidermal growth factor receptor (EGFR) intracellular domain are well known regulators of EGFR functions whereas those of its extracellular domain remain relatively unexplored. Here, we report that methylation at R198 and R200 of EGFR extracellular domain by protein arginine methyltransferase 1 (PRMT1) upregulates its binding to EGF and subsequent receptor dimerization and signaling activation. Methylation-defective EGFR mutant reduced tumor growth in mouse orthotopic xenograft model. Importantly, increased EGFR methylation sustains its signaling activation and cell proliferation in the presence of therapeutic EGFR monoclonal antibody, cetuximab. EGFR methylation level also correlates with higher recurrence rate after cetuximab treatment …

The Regulatory Function Of Sphingosine-1-Phosphate Signaling Axis On Regulatory T Cells In Colorectal Cancer, Andrew V. Nguyen, Yuan-Yuan Wu, Elaine Y. Lin

Publications and Research

In tumors associated with inflammation such as inflammatory bowel disease (IBD) and colorectal cancer (CRC), high numbers of regulatory T cells (Tregs) are associated with both favorable and poor prognoses. The functions of Tregs in CRC remain elusive and have yet to be clearly defined. With new evidence supporting many subsets of Tregs, the research on the development and functions of these cells has begun to come to fruition. The sphingosine 1 phosphate (S1P) pathway was recently reported to regulate the development and function of regulatory T cells. This pathway may shine new light into the pleiotropic nature of these …

Will The Addition Of Oxaliplatin To 5-Fluorouracil (5fu), And Leucovorin Improve Disease Free Survival Of Patients With Stage Iii Colon Cancer Who Had Surgical Resection Of The Tumor?, Sarah Cotter

PCOM Physician Assistant Studies Student Scholarship

Objective: The objective of this selective EBM review is to determine whether or not the addition of oxaliplatin to 5FU and leucovorin will improve disease free survival of patients with stage III colon cancer who had surgical resection of the tumor.

Study Design: Review of three published, double blind randomized control trials in the English language in 2004, 2007, and 2009.

Outcomes Measured: The outcome is disease free survival of colon cancer. It is measured using periodic patient follow-up. History and PE, neuro assessment, liver and kidney function tests, CEA test, CBC, and imaging studies such as colonoscopy or barium …

Efforts To Improve Colorectal Cancer Screening Rates, Yong S. Girdler

DNP Projects

This project attempts to describe the efficacy of FOBT (guaiac-based FOBT & fecal immunochemical test), explore FluFOBT program, and examine the relationship between advanced practice registered nurse knowledge level about CRC screening recommendation guideline and self-reported referral rates in efforts to improve CRC screening rates.

Co-Targeting Of Cyclooxygenase-2 And Foxm1 Is A Viable Strategy In Inducing Anticancer Effects In Colorectal Cancer Cells, Maqbool Ahmed, Azhar Hussain, Abdul K. Siraj, Shahab Uddin, Nasser Al-Sanea, Fouad Al-Dayel, Mohammed Al-Assiri, Shaham Beg, Khawla S. Al-Kuraya

Centre for Regenerative Medicine & Stem Cell Research

Background: Cross-talk between deregulated signaling pathways in cancer cells causes uncontrolled growth and proliferation. These cancers cells become more aggressive and quickly develop resistance to therapy. Therefore targeting of these deregulated pathways simultaneously can result in efficient cell death of cancer cells. In this study we investigated co-expression of Cox-2 and FoxM1 in a cohort of colorectal carcinoma (CRC) samples and also examined whether inhibition of Cox-2 and FoxM1 simultaneously can lead to inhibition of cell viability and induction of apoptosis in colorectal cancer cell lines and in vivo xenograf
Methods: Protein expression of Cox-2 and FoxM1 was determined …

Conducting A Needs Assessment At Outpatient Medical Clinic, Fidelia Ijeuru Ukah

Walden Dissertations and Doctoral Studies

Colorectal cancer is one of the most common cancers in the United States and confronting its challenges has remained a problem to the United States health sector, especially among outpatient clinics. Guided by health belief model, the purpose of this needs assessment was to identify patients age 50 and older in outpatient clinic located in a large metropolitan city in Texas who should receive information on the need for colorectal cancer screening based on their risk for developing colorectal cancer as outlined by American Cancer Society. A sample of 70 charts of patients age 50-75 years was randomly selected and …