odium Nitrate Could Be Disease Cure
By LAURAN NEERGAARD
WASHINGTON - Could the salt that preserves hot dogs also preserve your
health? Scientists at the National Institutes of Health think so.
They've begun infusing sodium nitrite into volunteers in hopes that it
could prove a cheap but potent treatment for sickle cell anemia, heart
attacks, brain aneurysms, even an illness that suffocates babies.
Those ailments have something in common: They hinge on problems with
low oxygen, problems the government's research suggests nitrite can
ease.
Beyond repairing the reputation of this often maligned meat
preservative, the work promises to rewrite scientific dogma about how
blood flows, and how the body tries to protect itself when that flow is
blocked. Indeed, nitrite seems to guard tissues - in the heart, the
lungs, the brain - against cellular death when they become starved of
oxygen.
It doesn't mean artery-clogging hot dogs are healthy.
But the NIH researchers have filed for new patents on this old,
overlooked chemical and are hunting a major pharmaceutical company to
help develop it as a therapy - even as doctors await the enrollment
of sick patients into research studies in coming months. The scientists
are so convinced of nitrite's promise that lead researcher Dr. Mark T.
Gladwin says the government will pursue drug development on its own if
necessary.
"We are turning organs into hot dogs," Gladwin jokes. Then he turns
serious: "We think we stumbled into an innate protection mechanism."
If it works, "this drug would be pennies to dollars per day," says Dr.
Christian Hunter of California's Loma Linda University. By January,
Hunter hopes to begin studies of nitrite treatment for babies with an
often fatal disease called pulmonary hypertension. "It's so easy to
use."
Gladwin and an NIH cardiologist, Dr. Richard Cannon III, discovered
nitrite's effect by accident while studying a related compound, nitric
oxide, long known to improve blood flow by dilating blood vessels, but
difficult to use as a drug.
Gladwin and Cannon injected sodium nitrite into healthy volunteers.
Tiny doses almost tripled blood flow. Moreover, when people exercised,
nitrite levels plummeted in the muscles being worked - the body was
using it.
The researchers were stunned. For 100 years, scientists thought nitrite
had little medical relevance.
High doses are an antidote for cyanide poisoning, but they're also
toxic. In 1944, 11 New Yorkers literally turned blue, their blood
struggling for oxygen, after they accidentally ate the meat
preservative instead of table salt.
The low levels that naturally occur in the human body were thought to
be inert, unimportant. Not anymore.
"This has led to an avalanche of work," says Gladwin, who this week
hosts an NIH meeting where scientists will compare nitrite research.
The work done so far is "sufficiently encouraging to warrant a
full-court press," says Dr. Franklin Bunn, a Harvard Medical School
professor who has reviewed much of the research.
When oxygen levels drop, the body's natural stores of nitrite convert
to nitric oxide, in turn dilating vessels so that more blood - and
more oxygen - gets through.
That's Step 1. Then there's tissue preservation.
Consider: Even after doctors clear a blocked artery to end a heart
attack, heart muscle continues to die for a while.
Nitrite interrupts that chain reaction, caused when harmful proteins
spewed by dying cells in turn take out their neighbors, says David
Lefer of Louisiana State University Health Sciences Center in
Shreveport.
But the heart's nitrite stores are depleted quickly.
"When you have a heart attack, you use it all up in the first few
minutes keeping the organ alive," Lefer says. "You need to add some
more."
So Lefer bred mice with low nitrite levels, clipped off the rodents'
main heart artery for 30 minutes, and infused nitrite before opening
the artery back up.
The salt cut by 67 percent the amount of heart muscle that died.
Gladwin says it worked as well in dogs, whose hearts are similar to
people's. He hopes a study in people suffering heart attacks could
begin next year.
The first human patients to test nitrite have sickle cell disease;
another piece of the nitrite puzzle is its connection to hemoglobin,
the oxygen-carrying protein that makes blood red.
Doctors have long thought the bouts of crippling pain suffered by
sickle cell patients resulted when their abnormally shaped red blood
cells clumped together to block blood flow.
But these red cells also dump large amounts of hemogloblin into blood
plasma, where it gobbles up nitric oxide, Gladwin found. That
constricts blood vessels, causing more pain as sickle-shaped blood
cells push through.
At NIH's hospital in Bethesda, Md., Gladwin has infused nitrite into
six sickle-cell patients. This first-stage study is designed to test
safety, not nitrite's effect on pain, but it is dilating participants'
blood vessels, he says.
Other ailments under study:
Babies with pulmonary hypertension today are treated with inhaled
nitric oxide, to lower blood pressure in arteries connecting the heart
and lungs. It's difficult, costs more than $1,000 a day and requires
complex machines available only at certain large hospitals.
Loma Linda's Hunter mixed nitrite into nebulizers, inexpensive plastic
containers that asthma patients often use to breathe in medicine
through the mouth. In sheep, this easier nitrite therapy treated
pulmonary hypertension better than nitric oxide.
The few people who survive a burst brain aneurysm face another big
hurdle: Within two weeks, their brain arteries spasm and about half
suffer a stroke. There's no prevention; doctors merely keep patients in
intensive care, poised to treat a stroke as soon as it happens.
NIH neurologist Dr. Edward Oldfield engineered monkeys to mimic a
developing spasm, and then infused the animals with either nitrite or
salt water for two weeks. None of the monkeys given nitrite had one -
but all of the saline-treated monkeys did.
"We were surprised at how complete the protection was, and with no
toxicity that we identified," Oldfield says. "The beauty of sodium
nitrite is it seems to interact with the hemoglobin in a way that
permits it to be released only where it's needed."
Doctors are e-mailing NIH to ask how soon a human study could begin,
Gladwin says; one is in planning stages.
It's a surprising revival for a substance once suspected of spurring
cancer. But sodium nitrite also is found in leafy green vegetables,
Gladwin likes to note - although no one knows if eating it would
bring any of the possible pharmaceutical benefit.
"The idea it's bad for you has not played out," he says. "The fact it
was linked to hot dogs gave it a bad name."