SATURDAY, JUNE 5, 2010
Medication Could Prevent Diabetes
New research published in The Lancet suggests that taking low doses of the popular diabetes drugs Avandia and metformin reduce the risk of type-2 diabetes in patients with pre-diabetes.
Side effects of Avandia include fluid retention, heart failure and, possibly, heart attacks, while side effects of Metformin only include upset stomach. Therefore, researchers chose to use a combination of the two drugs to lessen the risk of side effects.
The study included 207 patients with pre-diabetes. They were given two pills a day, both Avandia and Metformin or 2 placebos. In the 4 year study it was found that 14% of patients treated with these medications developed diabetes as opposed to 39% of those treated with a placebo.
Supposedly, the typical side effects of Avandia were not present; however 4 years is insufficient time to verify incidents of heart failure or heart attacks.
“The effect would likely be the same with Avandia's rival drug in the same class, Takeda's Actos, said Dr. Bernard Zinman of Mount Sinai Hospital at the University of Toronto, who led the study.”
Other generic brands include, pioglitazone, rosiglitazone, which belong to a class of drugs called thiazolidinediones help the body better use insulin.
“Type-2 diabetes is caused as the body gradually loses its ability to respond to insulin, a condition called insulin resistance. Overeating, a lack of exercise, genes and other factors all play a role.”
Gradually, beta cells in the pancreas begin to lose their ability to make insulin, which raises levels of glucose in the blood. In turn, these high levels of glucose begin to damage blood vessels and eventually organs.
GlaxoSmithKline admits to settling more lawsuits recently that allege Avandia caused heart attacks. In addition, sales of Avandia topped $3 billion in 2006, but fell to $1.2 billion in 2009.
Dr. Bernard Zinman of Mount Sinai Hospital at the University of Toronto and leader of the study affirms that it won’t be long until generic forms of Avandia and Actos are available, which suggests a less expensive treatment for diabetes prevention.
"The concept of combining submaximum doses of effective drugs to maintain efficacy and reduce side-effects is an attractive one," Dr. Thomas Buchanan of the University of Southern California wrote in a commentary.
Are we really in such a slothful society that medication as a method of prevention has overruled healthy lifestyles? Diabetes is a serious and debilitating disease so it may be necessary for those who are very at risk that could benefit from this type of treatment, but it is by no means the ultimate solution as even with medication the disease may still progress.
“The International Diabetes Federation estimates that 300 million people worldwide have pre-diabetes and 230 million have diabetes.”
Half doses of diabetes drugs can prevent disease
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POSTED BY MEG AT 9:11 AM 0 COMMENTS
LABELS: AVANDIA, BETA CELLS, DIABETES, GLAXOSMITHKLINE, GLUCOSE, HEART ATTACK, HEART FAILURE, INSULIN, METFORMIN, PANCREAS, PIOGLITAZONE, PRE-DIABETES, RESEARCH, ROSIGLITAZONE, THIAZOLIDINEDIONES
SUNDAY, APRIL 25, 2010
Salmonella Vaccine Could Benefit HIV-Infected Adults
It is well known that HIV-infected adults are more vulnerable to fatal strains of salmonella, however new research sheds light on this link. The crisis is more substantial in Africa, where salmonella is relatively common. In addition, the problem is amplified by the fact that no vaccine exists to fight this bacterium and people are becoming increasingly resistant to antibiotics currently being used to treat the disease.
“Nontyphoidal strains of Salmonella (NTS) usually cause vomiting and diarrhoea in high-income countries and are mainly contracted by consuming infected foods, such as uncooked meat and eggs. NTS can also cause fatal bloodstream infections in people with compromised immunity, such as HIV-infected individuals, and children under two years of age or with malaria, anaemia or malnutrition.”
New research tested the blood’s ability to kill salmonella in both uninfected adults and infected African adults. Results showed that antibodies in the blood samples of the uninfected adults were able to kill the salmonella with ease; however the blood of the infected could not. Despite the deficiencies in the compromised immune systems of those infected with the disease, high levels of salmonella-fighting antibodies were found in their blood samples. However, these antibodies were not able to fight the salmonella. Furthermore, the antibodies in the blood of HIV-infected adults actually prevented the antibodies in uninfected adults from eliminating the bacteria.
In a normal functioning immune system, antibodies bind to the outer membrane proteins on the surface of the salmonella bacteria in order to eliminate it, while antibodies in HIV-infected Africans prevent the elimination of the bacteria by blocking them from binding to the surface of the salmonella, rather they bind to the lipopolysaccharide (LPS) instead.
“When the researchers specifically removed the blocking antibodies from HIV-infected blood samples, they found killing antibodies present in the blood that could once again kill the bacteria. This shows that people infected with HIV still have the protective killing antibodies generated in the first two years of life that can control Salmonella infection, but the excess of blocking antibodies stops the killing antibodies from working.”
The study suggests that it is not a lack of antibodies, but an excess of antibodies that prevents the compromised immune system in HIV-infected adults from successfully fighting bacterial infections.
"The findings are important because LPS is currently being investigated as a potential target for a vaccine. Our observations that antibodies targeting LPS can actually impede the protective immune response to Salmonella would caution against this, suggesting that such a vaccine could do more harm than good." Alternatively, the outer membrane proteins of salmonella may be a more appropriate target for a new vaccine.
HIV Patients Hold Clues to Salmonella Vaccine Development
© www.thehealthnewsblog.com
POSTED BY MEG AT 10:42 AM 1 COMMENTS
LABELS: ANAEMIA, ANTIBIOTICS, ANTIBODIES, BACTERIA, HIV-AIDS, IMMUNE SYSTEM, LIPOPOLYSACCHARIDE, MALARIA, MALNUTRITION, SALMONELLA, VACCINE
FRIDAY, APRIL 16, 2010
Increasing Health Concern For Brain Tapeworm
Loyola researchers wrote in the journal Neurological Research that a serious and increasing health concern exists in Mexico and bordering southwestern states. In Mexico, up to 10% of the population may be infected by neurocysticercosis, a tapeworm in the brain.
“Neurocysticercosis, is the most common parasitic infestation of the central nervous system worldwide. Humans develop cysticercosis when they ingest eggs of the tapeworm Taenia solium.”
One becomes infected with this parasite by ingesting eggs or larvae from undercooked pork or through contaminated food, water or surfaces.
“Once inside the stomach, the tapeworm egg hatches, travels through the bloodstream and ends up in the muscles, brain or eyes. The worm, which can grow to more than one-half inch long, becomes enveloped in a fluid-filled cyst.”
Cysts found in muscles generally don't cause any symptoms, while those found in the eyes can cause blurred vision. The most damage is found in cysts in the brain. They can cause headaches, encephalitis and even seizures. At times, they may cause confusion and balance problems.
This type of infection is more common in poor rural communities in developing countries, especially where there is poor sanitation and hygiene.
Stage 1: Cysts begin to develop and appear within 1–4 weeks in the brain. People are typically asymptomatic during this phase, although rare, flu-like symptoms, seizures and increased intracranial pressure from massive infestation have been recorded.
Stage 2: Cysts mature by about 2 months after initially ingestion. Stage 2 cysts are also asymptomatic, and can persist for more than 10 years.
Stage 3: Cysts contain thick cystic fluid, thickened capsule, and appear two to 10 or more years after the cyst has matured. Most patients in this stage develop symptoms such as seizures, occasional focal neurological signs, headaches, nausea, vomiting, lethargy from increased intracranial pressure and altered mental status.
Stage 4: Cysts are calcified. Symptoms include persistent non-provoked seizures although most patients are asymptomatic.
Treatment may include medication or corticosteroids or surgery. Improving sanitation and increasing awareness may help to reduce the spread of the infection.