Navigation Links
Bacteria eyed for possible role in atherosclerosis
Date:1/5/2011

Dr. Emil Kozarov and a team of researchers at the Columbia University College of Dental Medicine have identified specific bacteria that may have a key role in vascular pathogenesis, specifically atherosclerosis, or what is commonly referred to as "hardening of the arteries" the number one cause of death in the United States.

Fully understanding the role of infections in cardiovascular diseases has been challenging because researchers have previously been unable to isolate live bacteria from atherosclerotic tissue. Using tissue specimens from the Department of Surgery and the Herbert Irving Comprehensive Cancer Center at Columbia University, Dr. Kozarov and his team, however, were able to isolate plaques from a 78-year-old male who had previously suffered a heart attack. Their findings are explained in the latest Journal of Atherosclerosis and Thrombosis.

In the paper, researchers describe processing the tissue using cell cultures and genomic analysis to look for the presence of culturable bacteria. In addition, they looked at five pairs of diseased and healthy arterial tissue. The use of cell cultures aided in the isolation of the bacillus Enterobacter hormaechei from the patient's tissue. Implicated in bloodstream infections and other life-threatening conditions, the isolated bacteria were resistant to multiple antibiotics. Surprisingly, using quantitative methods, this microbe was further identified in very high numbers in diseased but not in healthy arterial tissues.

The data suggest that a chronic infection may underlie the process of atherosclerosis, an infection that can be initiated by the systemic dissemination of bacteria though different "gates" in the vascular wall as in the case of a septic patient, through intestinal infection. The data support Dr. Kozarov's previous studies, where his team identified periodontal bacteria in carotid artery, thus pointing to tissue-destructing periodontal infections as one possible gate to the circulation.

Bacteria can gain access to the circulation through different avenues, and then penetrate the vascular walls where they can create secondary infections that have been shown to lead to atherosclerotic plaque formation, the researchers continued. "In order to test the idea that bacteria are involved in vascular pathogenesis, we must be able not only to detect bacterial DNA, but first of all to isolate the bacterial strains from the vascular wall from the patient," Dr. Kozarov said.

One specific avenue of infection the researchers studied involved bacteria getting access to the circulatory system via internalization in white blood cells (phagocytes) designed to ingest harmful foreign particles. The model that Dr. Kozarov's team was able to demonstrate showed an intermediate step where Enterobacter hormaechei is internalized by the phagocytic cells, but a step wherein bacteria are able to avoid immediate death in phagocytes. Once in circulation, Dr. Kozarov said, bacteria using this "Trojan horse" approach can persist in the organism for extended periods of time while traveling to and colonizing distant sites. This can lead to multitude of problems for the patients and for the clinicians: failure of antibiotic treatment, vascular tissue colonization and initiation of an inflammatory process, or atherosclerosis, which ultimately can lead to heart attack or stroke.

"Our findings warrant further studies of bacterial infections as a contributing factor to cardiovascular disease, and of the concept that 'bacterial persistence' in phagocytic cells likely contributes to systemic dissemination," said Dr. Kozarov, an associate professor of oral biology at the College of Dental Medicine. Dr. Jingyue Ju, co-author and director of the Columbia Center for Genome Technology & Bio-molecular Engineering, also contributed to this research, which was supported in part by a grant from the National Heart, Lung, and Blood Institute of the National Institutes of Health and by the Columbia University Section of Oral and Diagnostic Sciences.


'/>"/>

Contact: Alex Lyda
alyda@columbia.edu
212-305-0820
Columbia University Medical Center
Source:Eurekalert

Related medicine news :

1. AGA, General Mills announce grant to uncover role between intestinal bacteria and health and disease
2. Bacterial life on and in humans orchestrates health and disease
3. Bacteria seek to topple the egg as top flu vaccine tool
4. Learning the language of bacteria
5. Toxins from Staph Bacteria Disrupt Immune System
6. Latest American Chemical Society podcast: New water filter kills disease-causing bacteria
7. Severe Bacterial Strain Found in Cystic Fibrosis Patients in Canada
8. Unexpectedly small effects of mutations in bacteria bring new perspectives
9. Common stomach bacteria may fight off inflammatory bowel disease caused by Salmonella
10. Knowledge gaps, fears common among parents of children with drug-resistant bacteria
11. Intestinal enzyme helps maintain population of beneficial bacteria
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:2/5/2016)... (PRWEB) , ... February 05, 2016 , ... Today, the ... , announced that the much-anticipated feature with author Jahnavi Foster, specialist in healthy vegetarian ... TV Network. , Each week, on his weekly Whole-Food Warrior TV show, Frank Davis ...
(Date:2/5/2016)... ... February 05, 2016 , ... ... addition of micro-needling services in their Napa Valley office. The technique utilizes the ... Surgery Associates, Dr. Canales and Dr. Furnas, are part of only a select ...
(Date:2/5/2016)... Florida (PRWEB) , ... February 05, 2016 , ... ... non-profit organization devoted exclusively to funding innovative lymphoma research and serving the lymphoma ... – is poised to once again host, Swirl, A Wine Tasting Event at ...
(Date:2/5/2016)... ... 05, 2016 , ... Regular gym users know the routine: each January, they ... access the treadmills. It’s a predictable trend. After the excesses of November and December, ... shape by joining gyms, starting new walking or running routines, or signing up for ...
(Date:2/5/2016)... , ... February 05, 2016 , ... At its annual ... Patrick McDermott as Chairman of the National Board of Directors. Mr. McDermott succeeds former ... the Board,” stated Leslie A. Chambers , APDA President and CEO. “Pat has ...
Breaking Medicine News(10 mins):
(Date:2/5/2016)... , Feb. 5, 2016 Amgen (NASDAQ: AMGN ... Annual Global Healthcare Conference at 9:15 a.m. ET on Wednesday, ... . David W. Meline , executive vice president and ... Live audio of the presentation can be accessed from the ... A replay of the webcast will also be available on ...
(Date:2/5/2016)... , Feb. 5, 2016  Patients in Alabama ... focused ultrasound (HIFU) therapy no longer have to travel out ... its partnership with Urology Centers of Alabama to ... FDA-cleared procedure for qualifying patients. Alabama ... in the treatment of prostate cancer using many different modalities. ...
(Date:2/5/2016)... , February 5, 2016 ... Research report states that the global active pharmaceuticals ingredients ... is predicted to reach US$185.9 bn by 2020. It ... from 2014 to 2020. The title of the report ... Manufactured, by Geography, and by Therapeutic Area) - Global ...
Breaking Medicine Technology: