ProHealth health Vitamin and Natural Supplement Store and Health
Home  |  Log In  |  My Account  |  View Cart  View Your ProHealth Vitamin and Supplement Shopping Cart
800-366-6056  |  Contact Us  |  Help
Facebook Google Plus
Fibromyalgia  Chronic Fatigue Syndrome & M.E.  Lyme Disease  Natural Wellness  Supplement News  Forums  Our Story
Store     Brands   |   A-Z Index   |   Best Sellers   |   New Products   |   Deals & Specials   |   Under $10   |   SmartSavings Club

Trending News

10 Fibro-Friendly Foods with a Bonus: Beautiful Skin

Fight Back! Win the War Being Waged Against Your Immune System

Studies Show that Magnesium L-threonate Improves Brain Plasticity, Leading to Direct and Significant...

Clary Sage Oil May Be Pricey, but Its Benefits Are Priceless

Component of red wine, grapes can help to reduce inflammation, study finds

Poly MVA: A Novel Therapy for Increasing Energy, Repairing DNA, and Promoting Overall Health

Pumpkin Pie Turmeric Breakfast Smoothie - Vegan + Gluten-Free

Vitamin D supplementation extends life in mouse model of Huntington's disease

What’s Fenugreek Good For?

Omega-3 fatty acid stops known trigger of lupus

Print Page
Email Article

Study of Bacterial Enzyme Reveals One Key to Cancer Cell Survival

  [ 51 votes ]   [ Discuss This Article ] • April 24, 2003

WINSTON-SALEM, N.C. – An enzyme that helps disease-causing bacteria withstand attacks by the body's natural defenses turns out to be a key to human cell survival and growth and may help explain why cancer cells can multiply unchecked.

Leslie B. Poole, Ph.D., of Wake Forest University Baptist Medical Center said the explanation begins with the way that bacteria -- such as one that causes food poisoning -- use the enzyme to combat hydrogen peroxide. Hydrogen peroxide, best known as hair bleach or as an antiseptic, is toxic to cells and is one weapon that the body's white blood cells release in an attempt to kill invaders.

Bacteria such as salmonella use the enzyme, called a peroxiredoxin, to inactivate the hydrogen peroxide coming from the white blood cells.

In the April 25th issue of Science, Poole, associate professor of biochemistry, and her colleagues at Oregon State University describe how the same group of peroxiredoxin enzymes work differently in people and other mammals. The enzyme becomes the biochemical switch that keeps the amount of hydrogen peroxide in the body low, but allows it to increase when it is used for intracellular signaling.

The body's cells respond to their environment by generating signals to communicate between one another and between molecules inside the cells, Poole said.

"Hydrogen peroxide is an effective signaling molecule because it is rapidly produced, is reactive and is easily controlled by antioxidant enzymes," Poole said. The complex signaling pathways occur in mammals but not in bacteria.

What determines whether hydrogen peroxide acts as a dangerous oxidant or as a signal? The investigators propose that the peroxiredoxin enzyme controls the floodgates, keeping resting levels of hydrogen peroxide low, while permitting higher levels for signaling.

After studying the enzyme using Oregon State's single crystal X-ray diffractometer, Poole and her colleagues found that related peroxiredoxins have unique structures that have different shapes depending on whether they are used solely to prevent the flow of hydrogen peroxide or whether the hydrogen peroxide is also being used for signaling.

They propose that the enzyme ordinarily keeps the hydrogen peroxide in check, so that no signaling is produced. When the hydrogen peroxide is needed for signaling, an intracellular burst of hydrogen peroxide overwhelms the enzyme, switching it off and permitting the signal. When too much of the enzyme is present, the burst of hydrogen peroxide can't inactivate all of it, and the signal is blocked.

However, Poole said the bacterial peroxiredoxins -- like the ones in salmonella that she has studied -- "are resistant to this inactivation."

She explained, "Because the bacteria don't have the complex signaling pathways present in mammals, they don't need this ability to turn off the peroxiredoxin." So the enzyme is always available to eliminate hydrogen peroxide.

This discovery may shed light on human disease processes.

For example, Poole and her colleagues believe peroxiredoxin-regulated signaling may also be related to cancer. Ordinarily, abnormal cells in the body are programmed to die off, a process that scientists call apoptosis. In some cancer cells, apoptosis stops working, which means the cancer cells don't die off. The cancer cells may never get the signal to die because of the peroxiredoxin enzyme.

They found a correlation between this failure and too much peroxiredoxin, suggesting the two could be related.

Post a Comment

Featured Products From the ProHealth Store
Vitamin D3 Extreme™ Mitochondria Ignite™ with NT Factor® Ultra ATP+, Double Strength

Looking for Vitamins, Herbs and Supplements?
Search the ProHealth Store for Hundreds of Natural Health Products

Article Comments

Be the first to comment on this article!

Post a Comment

Natural Pain Relief Supplements

Featured Products

Optimized Curcumin Longvida® Optimized Curcumin Longvida®
Supports Cognition, Memory & Overall Health
Mitochondria Ignite™ with NT Factor® Mitochondria Ignite™ with NT Factor®
Reduce Fatigue up to 45%
Vitamin D3 Extreme™ Vitamin D3 Extreme™
50,000 IU Vitamin D3 - Prescription Strength
Ultra ATP+, Double Strength Ultra ATP+, Double Strength
Get energized with malic acid & magnesium
Energy NADH™ 12.5mg Energy NADH™ 12.5mg
Improve Energy & Cognitive Function

Natural Remedies

Improve Cardiovascular and Metabolic Health with Omega-7 Improve Cardiovascular and Metabolic Health with Omega-7
Undenatured Type II Collagen - Chicken Soup for Your Joints Undenatured Type II Collagen - Chicken Soup for Your Joints
The Guaifenesin Story: A centuries-old bark extract used for clearing the airways – now key to a popular FM symptom-reversal protocol The Guaifenesin Story: A centuries-old bark extract used for clearing the airways – now key to a popular FM symptom-reversal protocol
Are You Obtaining the Proper Enzymes? Are You Obtaining the Proper Enzymes?
The Surprising Benefits of Probiotics - What You Didn't Know The Surprising Benefits of Probiotics - What You Didn't Know

ProHealth, Inc.
555 Maple Ave
Carpinteria, CA 93013
(800) 366-6056  |  Email

· Become a Wholesaler
· Vendor Inquiries
· Affiliate Program
Credit Card Processing
Be the first to know about new products, special discounts and the latest health news. *New subscribers only

CONNECT WITH US ProHealth on Facebook  ProHealth on Twitter  ProHealth on Pinterest  ProHealth on Google Plus

© 2016 ProHealth, Inc. All rights reserved. Pain Tracker App  |  Store  |  Customer Service  |  Guarantee  |  Privacy  |  Contact Us  |  Library  |  RSS  |  Site Map