Thursday October 18, 2018

High Immunity Protein at Birth Cuts Childhood Malaria Risk

For the study, published in the Journal of Scientific Reports, the team examined 349 Mozambican pregnant women and their newborn babies up to two years of age

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A teenager caressing the newborn. Pixabay
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Newborn babies who are born with a high level of an immune-related protein in their blood cells are less likely to develop malaria throughout their early childhood, a study revealed.

The research showed that babies born with a high level of a certain type of immunity proteins cytokine, known as IL-12, in their umbilical cord blood had a higher resistance to the development of malaria in the first two years of their life.

“The finding suggests that there is a strong link between levels of this IL-12 protein obtained from the umbilical cord blood and the development of malaria in early childhood,” said lead author Yong Song, from Curtin University in Australia.

With more than 90 per cent of malaria infections occurring in sub-Saharan Africa, childhood malaria remains one of the leading causes of morbidity and mortality, resulting in 500,000 deaths annually.

Malaria is caused by parasites that are spread to people through mosquito bites.
Malaria is caused by parasites that are spread to people through mosquito bites. (VOA)

The team also investigated how newborn babies develop high levels of IL-12 in the cord blood.

“We found that the inbred quantity of these small proteins was not only influenced by children and mother’s genetic variation, but was also dependent on the immune system conditions of the mother during pregnancy,” Song noted.

Also Read: FDA Approves Drug to Stop Some Malaria Relapses

For the study, published in the Journal of Scientific Reports, the team examined 349 Mozambican pregnant women and their newborn babies up to two years of age.

“The study could have significant implications for future vaccine design techniques that could assist with the prevention of malaria in high-risk countries such as Mozambique,” said co-author Brad Zhang, Associate Professor from Curtin’s School of Public Health. (IANS)

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An Experimental Vaccine to Treat Malaria

Scientists hope to get a better grasp on the system these vaccines employ, known as cellular immunity. Harnessing this system could help tackle hepatitis and HIV infection.

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A doctor assists people looking for treatment for malaria at a health center in San Felix, Venezuela. VOA

After decades of disappointment in efforts to develop a malaria vaccine, researchers are starting to see promise in a new approach.

While most vaccines trigger the body’s defenses to produce antibodies against a disease-causing germ, the new approach recruits an entirely different branch of the immune system.

If it works, it could open up a new route to attack other diseases, including hepatitis and possibly HIV, the virus that causes AIDS.

Nearly 450,000 people die of malaria each year, according to the World Health Organization. The parasites that cause the disease are increasingly becoming drug-resistant.

One successful vaccine has been developed so far, but it prevented only about a third of cases in a clinical study.

Experts have decided that’s better than nothing. The vaccine is being piloted in Ghana, Kenya and Malawi.

Vaccine
Defensive cells killed liver cells that were infected with malaria parasites. (VOA)

New angle

Other scientists are trying a different angle of attack.

There are basically two ways to prevent germs from causing infections. “You either prevent them from getting into cells with antibodies, or you kill them inside the cells with T-cells,” said Stephen Hoffman, chief executive officer of Sanaria, a company working on one vaccine.

Most vaccines target the infection by building up antibodies. “If you need to kill them inside the cells with T-cells, we haven’t been overwhelmingly successful,” Hoffman said.

But Sanaria is one group seeing success by targeting malaria parasites inside infected liver cells, the first stop in the complex life cycle of the disease.

One key difference is how the vaccine is delivered. Hoffman’s group tried a typical route: injecting radiation-weakened parasites into patients’ skin or muscle. That didn’t work.

But it did work when injected directly into veins.

Vaccine
A public health worker takes a blood sample from a woman to be tested for malaria in Bo Rai district, Trat province, Thailand. VOA

The weakened parasites traveled to the liver, where they set off an immune reaction. Defensive cells killed liver cells that were infected with malaria parasites.

And the liver’s defenses were ready when faced with the real thing months later.

Most of that early work has been done in mice and macaques. When Hoffman and colleagues did something similar with a handful of human patients, most were protected against infection.

No waiting

Recruiting immune cells in the liver is especially effective because “we don’t need to wait until the immune system figures out that the parasite is in the liver and starts mounting an immune response, which can take days and sometimes weeks,” said Adrian Hill, director of the Jenner Institute at Oxford University.

“By then, the malaria’s gone. It only spends a week in the liver, and then it’s out in your blood causing disease.”

Vaccine
FILE – A worker of the Ministry of Public Health and Population fumigates in the street against mosquito breeding to prevent diseases such as malaria, dengue and Zika in Port-au-Prince, Haiti, Feb. 15, 2016. VOA

Hill’s group just published a study in the journal Science Translational Medicinein which immune cells in the liver were triggered by using a protein from the parasite, rather than the entire organism.

Scientists hope to get a better grasp on the system these vaccines employ, known as cellular immunity. Harnessing this system could help tackle hepatitis and HIV infection.

Also Read: Alcohol Kills More People Than AIDS, Violence Combines: WHO

Drugs can control HIV infection but can’t eliminate it from the body.

“If somebody could get cellular immunity to work really well for vaccination, that would be transformative for a whole range of diseases,” Hill said. “Not just for infectious diseases that we want to prevent, but ones that we want to treat and we can’t treat today.” (VOA)