Now, new research at Washington University School of Medicine in St. Louis suggests a key immune cell may play a role in lung cancer susceptibility. Working in mice, they found evidence that the genetic diversity in natural killer cells, which typically seek out and destroy tumor cells, contributes to whether or not the animals develop lung cancer.
The research is published in September in Cancer Research.
"Overall, humans are genetically very similar but their immune systems are incredibly diverse,” explains senior author Alexander Krupnick, MD, a thoracic surgeon at the Siteman Cancer Center at Barnes-Jewish Hospital and Washington University School of Medicine. “Our findings add to the growing body of evidence suggesting that innate differences in immunity may determine not only a person’s susceptibility to colds but also to lung cancer.”
Based on the findings in mice, Krupnick says he and his colleagues now are studying whether humans have a similar genetic diversity in their natural killer cells. As part of a new clinical study, they’re analyzing the blood of heavy smokers with and without lung cancer and never-smokers with and without lung cancer to look for differences.
“We want to know whether heavy smokers who don’t get lung cancer have natural killer cells that are somehow better at destroying newly developing lung cancer cells,” says Krupnick, associate professor of surgery. “And, by comparison, do patients who have never smoked but develop lung cancer have weak natural killer cells?”
For the mouse study, the scientists evaluated three groups of mice with varying susceptibilities to lung tumors. After the mice were exposed to a carcinogen that causes lung cancer, one group readily developed the disease while another showed little evidence of the tumors. A third group experienced moderate tumor growth.
When the researchers depleted natural killers cells from the mice using an antibody, those that had been resistant to lung cancer developed large, aggressive tumors.
Further, in mice susceptible to lung cancer, the scientists showed that manipulating the immune system with a bone marrow transplant could significantly block the development of lung cancer. Their studies indicate that natural killer cells, not other types of immune cells like T cells or inflammatory cells, are responsible for this phenomenon.
In other types of cancers, including those of the breast, colon and prostate, T cells are capable of destroying tumor cells. But in lung cancer, scientists suspect that T cells become inactivated, which may give natural killer cells a more prominent role.
The researchers also traced the genetic diversity of the natural killer cells in the mice to a region of chromosome 6, which includes numerous genes that influence the effectiveness of these cells.
Moving forward, Krupnick and his team want to learn whether natural killer cells influence lung cancer susceptibility in people. “We need to identify those patients who are resistant to lung cancer and ask, ‘What is unique about their natural killer cells – are they more potent or do they produce more of them than people with lung cancer?’ The answer will determine our next steps.”
The research is supported by the ATX/Lungevity Foundation, the Alvin Siteman Cancer Center Internal Research Grant by the American Cancer Society, the National Institutes of Health (KO8CA131097) and Biostatistics Core (P30 Ca091842), the Rheumatic Diseases Core Center NIH (P30 AR48335), National Institutes of Health (1R01HL094601), The Barnes-Jewish Foundation, the American Association for Thoracic Surgery, Advancing a Healthier Wisconsin, Thoracic Surgery Foundation for Research and Education and the generous support of the Charlotte and Sheldon Rudnick.
Kreisel D, Gelman AE, Higashikubo R, Lin X, Vikis HG, White JM, Toth KA, Deshpande C, Carreno BM, You M, Taffner SM, Yokoyama WM, Bui JD, Schreiber RD, Krupnick AS. Strain-specific variation in murine natural killer gene complex contributes to differences in immunosurveillance for urethane-induced lung cancer. Cancer Research. September 2012.
Washington University School of Medicine’s 2,100 employed and volunteer faculty physicians also are the medical staff of Barnes-Jewish and St. Louis Children’s hospitals. The School of Medicine is one of the leading medical research, teaching and patient care institutions in the nation, currently ranked sixth in the nation by U.S. News & World Report. Through its affiliations with Barnes-Jewish and St. Louis Children’s hospitals, the School of Medicine is linked to BJC HealthCare.
Caroline Arbanas | EurekAlert!
New Technique Maps Elusive Chemical Markers on Proteins
03.07.2015 | Salk Institute for Biological Studies
New approach to targeted cancer therapy
03.07.2015 | CECAD - Cluster of Excellence at the University of Cologne
Wind turbines could be installed under some of the biggest bridges on the road network to produce electricity. So it is confirmed by calculations carried out by a European researchers team, that have taken a viaduct in the Canary Islands as a reference. This concept could be applied in heavily built-up territories or natural areas with new constructions limitations.
The Juncal Viaduct, in Gran Canaria, has served as a reference for Spanish and British researchers to verify that the wind blowing between the pillars on this...
New technique combines electron microscopy and synchrotron X-rays to track chemical reactions under real operating conditions
A new technique pioneered at the U.S. Department of Energy's Brookhaven National Laboratory reveals atomic-scale changes during catalytic reactions in real...
Think of an object made of iron: An I-beam, a car frame, a nail. Now imagine that half of the iron in that object owes its existence to bacteria living two and a half billion years ago.
Think of an object made of iron: An I-beam, a car frame, a nail. Now imagine that half of the iron in that object owes its existence to bacteria living two and...
A team of scientists including PhD student Friedrich Schuler from the Laboratory of MEMS Applications at the Department of Microsystems Engineering (IMTEK) of...
The three-year clinical trial results of the retinal implant popularly known as the "bionic eye," have proven the long-term efficacy, safety and reliability of...
25.06.2015 | Event News
16.06.2015 | Event News
11.06.2015 | Event News
03.07.2015 | Press release
03.07.2015 | Agricultural and Forestry Science
03.07.2015 | Health and Medicine