When it comes to early diagnosis of Lyme disease, the insidious tick-borne illness that afflicts about 300,000 Americans annually, finding the proverbial needle in the haystack might be a far easier challenge—until now, perhaps. An experimental method developed by federal and university researchers appears capable of detecting the stealthy culprit Lyme bacteria at the earliest time of infection, when currently available tests are often still negative.
The team suggests the approach might also be useful for early detection of other elusive bacterial infections. The collaborators—from the National Institute of Standards and Technology (NIST), Institute for Bioscience and Biotechnology Research, and Johns Hopkins School of Medicine—recently reported the successful first trial of their new method.
“Our hypothesis was that Lyme bacteria shed vesicle-like particles—or fragments—derived from the cell wall of the bacteria circulating in the serum of individuals. These particles would contain membrane proteins that can be detected to provide a unique indicator of infection,” explains NIST research chemist Larik Turko.
The challenge was to detect these bacterial membrane proteins among the far, far more plentiful proteins normally present in serum, the watery, cell-free component of blood. The researchers speculated that running serum samples through a high-speed centrifuge—a standard step in chemistry labs—might selectively concentrate the larger, heavier fragments containing the bacterial membrane proteins into pellets. In effect, they predicted, this step would separate the wheat—the sparse target proteins—from the chaff—the much more abundant human serum proteins.
The new method’s promise was demonstrated in tests on serum samples drawn from three patients with undetected Lyme disease at the time of their initial doctor visit. By customizing standard analytical techniques for determining the types and amounts of chemicals in a sample, the team detected extremely small amounts of the target protein in all three samples.
For chemistry buffs, the protein in enriched samples was present at a level of about four billionths of a millionth of a mole, the standard unit for amount of substance.
In one patient, the experimental method detected the bacteria three weeks before infection was confirmed with the standard blood tests now used. For the other two, infection was detected simultaneously by the two methods.
“The complexity of Lyme disease, combined with lack of biomarkers to measure infection, has slowed progress,” study collaborator John Aucott, head of the Johns Hopkins Lyme Disease Clinical Research Center, said in advance of a session on precision and personalized medicine this weekend at the AAAS 2016 Annual Meeting in Washington, D.C. “Now, thanks to recent advances in technology, the tiniest concentration of blood molecules can now be detected, molecules that were previously ‘invisible’ to scientists.”
The current standard blood test for Lyme disease exposes the infection only after antibodies have accumulated to detectable levels, which can take up to 4 to 6 weeks. If patients exhibit a telltale bull’s-eye rash, diagnosis and treatment can begin earlier. But the rash does not occur in 20 to 30 percent of Lyme disease patients, according to the Centers for Disease Control and Prevention.
Rather than waiting for an infected person’s immune system to produce noticeable amounts of antibodies, the team chose to home in on the bacteria itself—specifically, proteins the bug sheds when attacked by the body’s defenses.
“From many candidates, we chose one that is both easily distinguished from human serum proteins and an unambiguous indicator of the bacteria,” Turko says. “This protein, which resides on the outer surface of membranes, became the target of our search in serum samples.”
But finding that target required an important preliminary step to ensure the accuracy of their measurements: making a reference sample that contained ample amounts of the target protein. With the reference sample, the team established the unmistakable signature the bug’s outer-surface membrane protein would yield when they examined samples drawn from patients. As a result of these steps, the team could detect the copies of the target protein, even though human proteins were 10 million times more plentiful.
“We believe that this approach may be universally applicable to detection of other bacterial infections in humans,” the researchers write.
The Latest on: Lyme disease
via Google News
The Latest on: Lyme disease
- OU researchers contribute to study on possible alternative treatment for Lyme diseaseon October 14, 2021 at 9:48 am
Researchers at the University of Oklahoma contributed to a study published in the journal, Cell, that describes a new antibiotic with the potential to cure Lyme disease.
- Lyme carditis: Things can get complicated when Lyme disease affects heart functionon October 13, 2021 at 2:58 pm
Patients with Lyme disease can develop Lyme carditis, a potentially serious complication that affects cardiac function.
- Pennsylvania lawmakers are locked in a partisan battle over the release of disease data shielded by 1955 lawon October 13, 2021 at 1:33 pm
The question of whether Pennsylvania can deny information requests based on the 1955 Disease Control and Prevention Law has turned into a party-line battle in Harrisburg.
- New Compound Selectively Kills Lyme Disease Bacteria, Eradication Could Be Possibleon October 12, 2021 at 2:51 am
A new drug discovered by scientists from Northeastern University could finally be a viable method of eradicating Lyme disease, a chronic bacterial disease ...
- Scientists Identify New Chemical To Fight Lyme Diseaseon October 11, 2021 at 11:04 am
Lyme Disease is a serious and growing problem in North America. In the past decade, cases have exploded and we have learned more about some of the long-term consequences of the disease. According ...
- Naturally Occurring Antibiotic Kills Lyme Disease and Nothing Else: A Potential Breakthrough Treatmenton October 10, 2021 at 5:56 pm
Antibiotic that selectively targets Lyme Disease, doesn't damage the microbiome, and doesn't spread resistance, was just found by scientists ...
- Before You Grow: Educator gives first-hand account of Lyme diseaseon October 8, 2021 at 7:05 am
By Marcus McCartney OSU Extension Educator Lyme disease is the most common vector-borne disease in the United States. Lyme disease is caused by a specific bacterium, Borrelia burgdorferi. It is ...
- Targeted treatment may prevent chronic Lyme diseaseon October 7, 2021 at 5:30 am
Chronic Lyme disease has frustrated doctors and patients alike for years. The severe, lingering symptoms, such as chronic fatigue, muscle and joint pain, arthritis, or cognitive difficulties, have ...
- Drug treatment for Lyme disease could lead to its eradicationon October 6, 2021 at 8:11 am
Lyme disease, a tick-borne illness that is becoming more common in many countries, could be eradicated using a drug that kills the disease-causing bacterium ...
- Lyme disease in 1/3 of black patients diagnosed late: Possibly due to early signs being missedon October 6, 2021 at 5:30 am
A UCLA study suggests that many physicians may not have the knowledge or training to properly recognize how Lyme disease appears on the skin of Black patients. The disease, caused by the tick ...
via Bing News