A preventive DNA vaccine encoding two Zika structural proteins protected Rhesus macaques from viral infection. The results, published today (September 22) in Science, are encouraging for organizers of the ongoing Phase 1 clinical trial testing one of the two vaccines examined in this nonhuman primate study. The new work suggests a minimal antibody level in the blood that is likely necessary for protection against Zika virus infection in in people.
Donor stem cell–derived retinal epithelial cells whose immune proteins correspond to those of a recipient are tolerated following transplant into monkeys’ eyes, according to a report published today (September 15) in Stem Cell Reports. In an accompanying paper, the team also reports that such immune-matched retinal cells derived from humans prevent immune responses in cultured human lymphocytes.
After scientists infected a pregnant pigtail macaque with Zika virus, the primate’s fetus developed brain lesions similar to those observed in some human babies born to Zika-infected mothers, the team reported yesterday (September 12) in Nature Medicine.
“Our results remove any lingering doubt that the Zika virus is incredibly dangerous to the developing fetus and provides details as to how the brain injury develops,” study coauthor Kristina Adams Waldorf of the University of Washington School of Medicine said in a statement.
Researchers design a Cas9 enzyme that cuts DNA only in the presence of particular drug.
There are various ways to turn CRISPR/Cas9’s gene-editing activity on and off in cells, such as exposing tailor-made Cas9 enzymes to a particular type of light or to specific drugs. Each technique developed so far has drawbacks—either being complicated or irreversible. So researchers took inspiration from the Cre-recombinase-based method to control gene expression and built a “user-friendly” protocol for reversibly activating and inactivating CRISPR.
The benefits of the cholesterol-reducing drug statins are underestimated and the harms exaggerated, a major review suggests.
Published in the Lancet and backed by a number of major health organisations, it says statins lower heart attack and stroke risk.
The review also suggests side effects such as muscle pain do occur, although in relatively few people.
But critics say healthy people are unnecessarily taking medication.
Statins reduce the build-up of fatty plaques that lead to blockages in blood vessels. According to the report authors:
- About six million people are currently taking statins in the UK
- Of those, two million are on them because they have already had a heart attack, stroke or other cardiovascular event
- The remaining four million take statins because of risk factors such as age, blood pressure or diabetes
- Up to two million more should possibly take statins
The Lancet review, led by Prof Rory Collins from the Clinical Trial Service Unit at the University of Oxford, looked at the available evidence for the effects of taking an average 40mg daily dose of statins in 10,000 patients over five years.
It suggested cholesterol levels would be lowered enough to prevent 1,000 “major cardiovascular events” such as heart attacks, strokes and coronary artery bypasses in people who had existing vascular disease – and 500 in people who were at risk due to age or other illnesses such as high blood pressure or diabetes.
IMM-101 drug has extended lives of people with metastatic pancreatic cancer and appears to have no side-effects
A new drug that “wakes up” the immune system to attack cancer has extended the lives of people with metastatic pancreatic cancer and has no side-effects, raising hopes for a new and powerful tool against the most intractable form of the disease.
The drug, IMM-101, is considered groundbreaking because pancreatic cancer that has spread to other parts of the body usually kills within a few months.
The patients who were given the new immunotherapy drug actually felt better than those who were on standard chemotherapy, said Angus Dalgleish, professor of oncology at St George’s, University of London, who led the research.
Dalgleish is excited by the potential of the immunotherapy drug, although the trial is relatively small, involving 110 people. Only 18% of patients with advanced pancreatic cancer are alive after one year and 4% after five years, so new treatments for the disease are badly needed.
A drug that destroys the characteristic protein plaques that build up in the brains of patients with Alzheimer’s is showing “tantalising” promise, scientists say.
Experts are cautious because the drug, aducanumab, is still in the early stages of development.
But a study in Nature has shown it is safe and hinted that it halts memory decline.
Larger studies are now under way to fully evaluate the drug’s effects.
The build-up of amyloid in the brain has been a treatment target for many years.
This study, of 165 patients, was designed to test aducanumab was safe to take.
After a year of treatment, it also showed the higher the dose the stronger the effect on amyloid plaques.