About Careers Internship MedBlogs Contact us
Medindia LOGIN REGISTER
Advertisement

Identification Of Culprit Behind Chemotherapy Resistance in Cancer

by Rukmani Krishna on August 8, 2012 at 11:21 PM
Font : A-A+

 Identification Of Culprit Behind Chemotherapy Resistance in Cancer

A protein that enables cancer cells to grow, invade tissues and eventually resist chemotherapy and has lethal consequences for patients was found by researchers.

A team of scientists led by Fred Hutchinson Cancer Research Center has discovered a key factor that drives this drug resistance - information that ultimately may be used to improve the effectiveness of therapy and buy precious time for patients with advanced cancer.

Advertisement

"Cancer cells inside the body live in a very complex environment or neighborhood. Where the tumor cell resides and who its neighbors are influence its response and resistance to therapy," said senior author Peter S. Nelson, M.D., a member of the Hutchinson Center's Human Biology Division.

Nelson and colleagues found that a type of normal, non-cancerous cell that lives in cancer's neighbourhood - the fibroblast - when exposed to chemotherapy sustains DNA damage that drives the production of a broad spectrum of growth factors that stimulate cancer growth.
Advertisement

Under normal circumstances, fibroblasts help maintain the structural integrity of connective tissue, and they play a critical role in wound healing and collagen production.

Specifically, the researchers found that DNA-damaging cancer treatment coaxes fibroblasts to crank out a protein called WNT16B within the tumour neighbourhood, or microenvironment, and that high levels of this protein enable cancer cells to grow, invade surrounding tissue and resist chemotherapy.

The researchers observed up to 30-fold increases in WNT production - a finding that was "completely unexpected," Nelson said.

The WNT family of genes and proteins plays an important role in normal development and also in the development of some cancers but, until now, was not known to play a significant role in treatment resistance.

This discovery suggests that finding a way to block this treatment response in the tumour microenvironment may improve the effectiveness of therapy.

"Cancer therapies are increasingly evolving to be very specific, targeting key molecular engines that drive the cancer rather than more generic vulnerabilities, such as damaging DNA. Our findings indicate that the tumor microenvironment also can influence the success or failure of these more precise therapies." In other words, the same cancer cell, when exposed to different "neighborhoods," may have very different responses to treatment.

The major clinical reason that chemotherapy ultimately fails in the face of advanced cancer, Nelson said, is because the doses necessary to thoroughly wipe out the cancer would also be lethal to the patient.

"In the laboratory we can 'cure' most any cancer simply by giving very high doses of toxic therapies to cancer cells in a petri dish. However, in people, these high doses would not only kill the cancer cells but also normal cells and the host," he said.

Therefore, treatments for common solid tumours are given in smaller doses and in cycles, or intervals, to allow the normal cells to recover. This approach may not eradicate all of the tumour cells, and those that survive can evolve to become resistant to subsequent rounds of anti-cancer therapy.

The study was recently published online in advance of print publication in Nature Medicine.

Source: ANI
Advertisement

Advertisement
News A-Z
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
What's New on Medindia
Vaccination  And Counter  Measures Against  Monkeypox
Indian Railways Special Concession on Health Grounds
COVID Toes
View all
Recommended Reading
News Archive
Date
Category
Advertisement
News Category

Medindia Newsletters Subscribe to our Free Newsletters!
Terms & Conditions and Privacy Policy.

More News on:
Cancer and Homeopathy Chronic Lymphocytic Leukemia Hodgkins Lymphoma Non-Hodgkins Lymphoma Chemotherapy Chemotherapy Drugs Cancer Facts Cancer Tattoos A Body Art Peritoneal Cancer 

Most Popular on Medindia

A-Z Drug Brands in India Pregnancy Confirmation Calculator How to Reduce School Bag Weight - Simple Tips Nutam (400mg) (Piracetam) Calculate Ideal Weight for Infants Sanatogen Drug Interaction Checker Iron Intake Calculator Vent Forte (Theophylline) Find a Hospital

Disclaimer - All information and content on this site are for information and educational purposes only. The information should not be used for either diagnosis or treatment or both for any health related problem or disease. Always seek the advice of a qualified physician for medical diagnosis and treatment. Full Disclaimer

© All Rights Reserved 1997 - 2022

This site uses cookies to deliver our services. By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Use