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Recent News and Articles on the Keywords: blood vessels + preconditioning + protect  Related to the article below (Last Update: 5/5/2008)

Secondhand Smoke Exposure Can Cause Cell Damage In 30 Minutes
Science Daily (press release) - 59 minutes ago
Compounding the injury to the blood vessels themselves, the exposure to smoke impedes the function of the body's natural repair mechanisms that are ...
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Times of India, India -
The lack of oxygen sets off a biological alarm, but when the child's eyes try to grow new blood vessels to compensate, they are deformed, compounding the ...
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International Herald Tribune, France -
Dr. Abdullah al-Bashir said he performed an angiogram on Abbas last Thursday to check for blocked blood vessels, a cause of heart attacks, but no problems ...
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Science Daily (press release) - Apr 21, 2008
However, the architecture of these newly formed blood vessels differs from the normal one; they are poorly organized and regarded as immature. ...
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Malaysia Star, Malaysia - May 3, 2008
A majority of nosebleeds that occurs in children are usually due to the damage of blood vessels in the anterior (front) part of the nose when children pick ...

Telegraph.co.uk
New technique reverses growth of cancer blood vessels
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A gene called RGS5 makes a signalling molecule that can reverse angiogenesis - the growth of blood vessels inside the tumour - reports a team from the ...
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Science Daily (press release) - May 1, 2008
"We discovered a compound that reverses the fibrosis that makes the blood vessels more rigid." The American Heart Association estimates that 72 million ...
Cardica's C-Port(R) Flex A(R) Anastomosis System Facilitates ...
CNNMoney.com (press release) -
... reliable and consistently reproducible anastomoses, or connections of blood vessels, often considered the most critical aspect of the CABG procedure. ...CRDC
Leaky Blood Vessels Open Up Nerve Cells To Toxic Assault In Lou ...
Science Daily (press release) - Apr 8, 2008
ScienceDaily (Apr. 9, 2008) ? Leaky blood vessels that lose their ability to protect the spinal cord from toxins may play a role in the development of ...
RPAC hosts health fair
OSU - The Lantern, OH -
High blood pressure is usually the result of the heart encountering more resistance within blood vessels. As people age, plaque builds up on artery walls ...
Source: Google News

Nitric Oxide Mediates Cerebral Ischemic Tolerance in a Neonatal Rat Model of Hypoxic Preconditioning -
JM Gidday, AR Shah, RG Maceren, Q Wang, DA … - Journal of Cerebral Blood Flow & Metabolism, 1999 - nature.com
... and protein are basally expressed in parenchymal blood vessels throughout the PND ...
of AG on the development of preconditioning-induced protection in our ...

Previous Angina Alters In-Hospital Outcome in TIMI 4 A Clinical Correlate to Preconditioning? -
RA Kloner, T Shook, K Przyklenk, VG Davis, L Junio … - Circulation, 1995 - Am Heart Assoc
... epicardial coronary collateral blood vessels or solely on ... cyclic flow variations
`precondition' ischemic myocardium. ... of ischemic preconditioning on myocardial ...

M OLECULAR A PPROACH TO A DENOSINE R ECEPTORS: Receptor-Mediated Mechanisms of Tissue Protection -
J Linden - Annual Reviews in Pharmacology and Toxicology, 2001 - Annual Reviews
... of coronary arteries and, to a variable extent, other blood vessels. ... of A 1 and possibly
A 3 (25) receptors produces preconditioning to protect the heart ...

Consequences of Brief Ischemia: Stunning, Preconditioning, and Their Clinical Implications Part 2 -
RA Kloner, RB Jennings - Circulation, 2001 - Am Heart Assoc
... on recruitment of collateral blood vessels, because species ... the same pathways as
ischemic preconditioning) also appeared to precondition human tissue. ...

Myocardial protection with postconditioning is not enhanced by ischemic preconditioning -
ME Halkos, F Kerendi, JS Corvera, NP Wang, H Kin, … - The Annals of Thoracic Surgery, 2004 - Elsevier
... myocardium served by the target vessel have been ... The protective effects of ischemic
preconditioning and postconditioning ... of changes in collateral blood flow in ...

Ischemic Preconditioning Prevents Endothelial Injury and Systemic Neutrophil Activation During … -
RK Kharbanda, M Peters, B Walton, M Kattenhorn, M … - Circulation, 2001 - Am Heart Assoc
... be reduced by prior ischemic preconditioning (IPC ... vivo and examined the protection
afforded by ... mediated dilation) and resistance vessels (blood flow responses ...

Acute Ischemic Preconditioning of Skeletal Muscle Prior to Flap Elevation Augments Muscle-Flap … -
CMA Carroll, SM Carroll, MLE Overgoor, G Tobin, JH … - Plastic and Reconstructive Surgery, 1997 - plasreconsurg.com
... of reperfusion required to precondition the rat ... effect of ischemic preconditioning
is induced ... 31-35 Furthermore, adenosine reduces blood vessel wall affinity ...

Anaesthetics and cardiac preconditioning. Part II. Clinical implications -
M Zaugg, E Lucchinetti, C Garcia, T Pasch, DR … - British Journal of Anaesthesia, 2003 - British Jrnl Anaesthesia
... It also showed that collateral vessel recruitment is ... adjunct to intermittent cold
blood cardioplegia ... myocardial metabolism by combining preconditioning with beta ...

… of Ischemic Brain Edema and Cerebrovascular Injury After Ischemic Preconditioning in the Rat -
T Masada, Y Hua, G Xi, SR Ennis, RF Keep - Journal of Cerebral Blood Flow & Metabolism, 2001 - nature.com
... This protection occurred in cortex and basal ganglia ... numerous HSP70ir neuron animals
undergoing preconditioning but not ... there are no HSP70ir blood vessels in (A ...

Doxorubicin preconditioning: A protection against rat hepatic ischemia-reperfusion injury -
K Ito, H Ozasa, K Sanada, S Horikawa - Hepatology, 2000 - doi.wiley.com
... ischemia was induced by occluding the blood vessels to the ... Sampled blood was then
centrifuged to obtain the serum ... (C) Doxorubi- cin-preconditioning rat livers ...

Source: Google Scholar

"Preconditioning" Helps Protect Brain's Blood Vessels from Stroke

Weill Cornell Study Shows Therapeutic Potential of Harnessing Tissue's Own Defenses
NEW YORK (July 17, 2007) — Challenging brain tissue with a small noxious stimulus beforehand gives it a resilience that can lessen damage to blood vessels during a stroke, report researchers at Weill Cornell Medical College in New York City.

"This preconditioning works along the theory of 'what doesn't kill me makes me stronger,'" explains senior researcher Dr. Costantino Iadecola, the George C. Cotzias distinguished professor of neurology and neuroscience and Director of Neurobiology at Weill Cornell, and attending neurologist at NewYork-Presbyterian Hospital/Weill Cornell Medical Center.
"We already knew that preconditioning helps minimize damage to heart tissue — it's a strategy cardiologists routinely use today. And we know it can help protect brain cells — neurons — against stroke damage," Dr. Iadecola says. "Now, besides illuminating mechanisms involved in this process, our new study in mice demonstrates that preconditioning also shields the brain's blood vessels from stroke injury," he explains.

"The hope is that by studying this natural means of self-defense, we might develop potent pharmaceutical means of either preventing stroke or minimizing stroke damage," he says.

The findings appear as a special highlighted paper in the Journal of Neuroscience.

According to the National Stroke Association, stroke is the third leading killer of Americans and the number one cause of adult disability. And yet scientists have still not developed a truly effective means of treating these attacks.

"We knew that preconditioning — giving the brain a slight noxious stimulus beforehand — can strengthen brain cells against damage from a larger insult later on. This phenomenon occurs naturally in the human brain," explains lead researcher Dr. Alexander Kunz of the University of Dresden, Germany. Dr. Kunz worked on the study while at Weill Cornell.

But exactly how does preconditioning work, and can it come to the aid of the brain's vasculature, as well?

Based on their prior work, the researchers knew that the protective effect of preconditioning relies on a ubiquitous chemical in the blood called nitric oxide (NO). Injuries to tissues — such as the ischemia that occurs in stroke — activate certain enzymes that produce NO. This process also produces destructive, oxidative byproducts called free radicals.

According to the new study, NO combines with these free radicals to produce low levels of another molecule, called peroxynitrite.

"At higher levels, peroxynitrite is a very dangerous chemical for tissues," Dr. Iadecola explains. "But we discovered that at these lower concentrations, it's actually beneficial — helping to preserve the function of blood vessels in the brain whenever a more toxic event occurs."

Normal mice given an inflammatory toxin called lipopolysaccharide (LPS) 24 hours before an induced stroke — the preconditioning method used in this study — had a 68 percent reduction in stroke intensity, the researchers found.
Preconditioning also boosted blood flow in areas of the brain unaffected by the stroke by 114 percent.

However, mice that were genetically engineered so that they could not produce NO gained no such advantage from preconditioning. This suggests that NO and its chemical offspring, peroxynitrite, are essential to this protective process.

"Our study also demonstrates that preconditioning makes blood vessels more resilient against the damage caused by cerebral ischemia, just as it does for neurons," Dr. Iadecola notes. "After preconditioning, the vessels of the brain are impervious to the effects of the stroke and continue to function at a nearly normal level. That's something no one had shown before."

He stressed that it's far too dangerous to give patients peroxynitrite, so the goal here is to figure out how low concentrations of the chemical work their protective magic.

"What cell signaling mechanisms does it activate, for example? If we could find that out, we might be able to create a pharmaceutical mimic that could protect stroke patients," Dr. Iadecola says.

"The real novelty here is that we are looking for a stroke treatment that simply replicates strategies the brain is already using to protect itself," the researcher says. "There's a large population out there at high risk for stroke, and we believe this approach could really help them. It might even help minimize brain tissue damage should any stroke occur."

This work was supported by the U.S. National Institutes of Health and the Deutsche Forschungsgemeinschaft.

Co-researchers include Dr. Laibaik Park, Dr. Josef Anrather, Dr. Ping Zhou, Takato Abe and Eduardo Gallo — all of the Division of Neurobiology at Weill Cornell Medical College.


Weill Cornell Medical College


Weill Cornell Medical College — Cornell University's Medical School located in New York City — is committed to excellence in research, teaching, patient care and the advancement of the art and science of medicine, locally, nationally and globally. Weill Cornell, which is a principal academic affiliate of NewYork-Presbyterian Hospital, offers an innovative curriculum that integrates the teaching of basic and clinical sciences, problem-based learning, office-based preceptorships, and primary care and doctoring courses. Physicians and scientists of Weill Cornell Medical College are engaged in cutting-edge research in such areas as stem cells, genetics and gene therapy, geriatrics, neuroscience, structural biology, cardiovascular medicine, AIDS, obesity, cancer, psychiatry and public health — and continue to delve ever deeper into the molecular basis of disease in an effort to unlock the mysteries behind the human body and the malfunctions that result in serious medical disorders. The Medical College — in its commitment to global health and education — has a strong presence in such places as Qatar, Tanzania, Haiti, Brazil, Salzburg, and Turkey. With the historic Weill Cornell Medical College in Qatar, the Medical School is the first in the U.S. to offer its M.D. degree overseas. Weill Cornell is the birthplace of many medical advances — from the development of the Pap test for cervical cancer to the synthesis of penicillin, the first successful embryo-biopsy pregnancy and birth in the U.S., the world's first clinical trial for gene therapy for Parkinson's disease, and, most recently, the first indication of bone marrow's critical role in tumor growth. For more information, visit www.med.cornell.edu.

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