Tobacco use makes precancerous cells that fertilize cancer growth: Study

Agencies
April 3, 2019

Apr 3: A recent study has found that tobacco consumption leads to the formation of precancerous cells that fertilize cancer growth. There have been a lot of studies dedicated to cancer-related topics, exactly how this precancerous field influences cancer has been often overlooked. As part of the study, the researchers wanted to understand how these precancerous cells may impact neighboring cancer.

The study explores this communication between precancerous and cancer cells in the context of an enzyme called PI3K. The enzyme PI3K is activated in many or even most cancers, with some researchers considering PI3K over-activation an essential feature driving the disease. Attractively, PI3K is a “kinase” and the class of drugs known as kinase inhibitors has proven effective against a host of cancer types. Kinase inhibitors have been developed against PI3K as well, and by and large they do a lovely job of killing cancer cells in dishes.

The ongoing question has been why PI3K inhibitors do not necessarily work in patients – what are cancer cells doing to resist this therapy that should kill them? The current study offers an intriguing hint: “These cancer cell lines in culture are sensitive to PI3K inhibition, but when you put them next to precancerous cells, they become resistant,” Young says. “These cancer cell lines in culture are sensitive to PI3K inhibition, but when you put them next to precancerous cells, they become resistant,” said Christian Young, senior author of the study discussed in AACR Annual Meeting 2019.

To explore this observation, the team of researchers including first author Khoa Nguyen, grew head and neck cancer cells in the same dish as precancerous cells (called NOK cells), and then hit the cells, alone and together, with PI3K inhibitors. Cancer cells grown with NOK cells grew faster and resisted PI3K inhibition compared with cancer cells grown alone. When the researchers grew NOK cells alone, then removed the cells, and “fertilized” cancer cells with the culture medium in which NOK cells had grown, they saw similar cancer cell growth and PI3K inhibitor resistance. Additionally, the NOK cells were stimulating cancer stem cell-like features in the recipient cancer cells. This means that in addition to resisting PI3K therapy, cancer cells that sit alongside precancerous cells may themselves become more dangerous, for example, more able to restart the disease.

“What this means is that some properties of cancer cells may not necessarily be intrinsic. In our study, cancer cells were given some of their cancer-like and stem cell-like properties by nearby, precancerous cells,” Young says. Continuing the line of study, Young and his team asked what these precancerous cells were giving to head and neck cancer cells that allowed them to resist PI3K therapy and gain cancer stem cell-like traits. What they found is a dramatic increase in EGFR ligands – think of PI3K like an engine driving cancer growth. EGFR is another engine that can work alongside PI3K. In this analogy, EGFR ligands are like fuel, allowing cancer cells, in the absence of PI3K, to power their growth and survival through the engine of EGFR instead.”It was the precancerous cells that were providing this fuel,” Young says.

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Agencies
June 12,2020

Global poverty could rise to over one billion people due to the COVID-19 pandemic and more than half of the 395 million additional extreme poor would be located in South Asia, which would be the hardest-hit region in the world, according to a new report.

Researchers from King's College London and Australian National University published the new paper with the United Nations University World Institute for Development Economics Research (UNU-WIDER) said that poverty is likely to increase dramatically in middle-income developing countries and there could be a significant change in the distribution of global poverty.

The location of global poverty could shift back towards developing countries in South Asia and East Asia, the report said.

The paper, 'Precarity and the Pandemic: COVID-19 and Poverty Incidence, Intensity and Severity in Developing Countries,' finds that extreme poverty could rise to over one billion people globally as a result of the crisis.

The cost of the crisis in lost income could reach USD 500 million per day for the world's poorest people, and the intensity and severity of poverty are likely to be exacerbated dramatically.

The report said that based on the USD 1.90 a day poverty line and a 20 per cent contraction, more than half of the 395 million additional extreme poor would be located in South Asia, which would become the hardest hit region in the world mainly driven by the weight of populous India followed by sub-Saharan Africa which would comprise 30 per cent, or 119 million, of the additional poor.

The report added that as the value of the poverty line increases, a larger share of the additional poor will be concentrated in regions where the corresponding poverty line is more relevant given the average income level.

For instance, the regional distribution of the world's poor changes drastically when looking at the USD 5.50 a day poverty line the median poverty line among upper-middle-income countries.

At this level, almost 41 per cent of the additional half a billion poor under a 20 per cent contraction scenario would live in East Asia and the Pacific, chiefly China; a fourth would still reside in South Asia; and a combined 18 per cent would live in the Middle East and North Africa (MENA) and in Latin America and the Caribbean (LAC), whose individual shares are close to that recorded for sub-Saharan Africa.

India plays a significant role in driving the potential increases in global extreme poverty documented previously, comprising almost half the estimated additional poor regardless of the contraction scenario, the report said.

Nonetheless, there are other populous, low and lower-middle- income countries in South Asia, sub-Saharan Africa, and East Asia and the Pacific accounting for a sizeable share of the estimates: Nigeria, Ethiopia, Bangladesh, and Indonesia come next, in that order, concentrating a total of 18 19 per cent of the new poor, whereas the Democratic Republic of Congo, Tanzania, Pakistan, Kenya, Uganda, and the Philippines could jointly add 11 12 per cent.

Taken together, these figures imply that three quarters of the additional extreme poor globally could be living in just ten populous countries.

The report added that this high concentration of the additional extreme poor is staggering , although not necessarily unexpected given the size of each country's population.

On one hand, data shows that three of these ten countries (Ethiopia, India, and Nigeria) were among the top ten by number of extreme poor people in 1990 and remained within the ranks of that group until 2018.

Despite this crude fact, two of these countries have managed to achieve a sustained reduction in their incidence of poverty since the early 1990s, namely Ethiopia and India, reaching their lowest poverty headcount ratio ever recorded at about 22 and 13 per cent, respectively. Nonetheless, the potential contraction in per capita income/consumption imposed by the pandemic's economic effects could erase some of this progress.

The researchers are now calling for urgent global leadership from the G7, G20, and the multilateral system, and propose a three-point plan to address the impact of the COVID-19 on global poverty quickly.

Professor of International Development at King's College London and a Senior Non-Resident Research Fellow at UNU-WIDER Andy Sumner said the COVID-19 crisis could take extreme poverty back over one billion people because millions of people live just above poverty.

Millions of people live in a precarious position one shock away from poverty. And the current crisis could be that shock that pushes them into poverty.

Professor Kunal Sen, Director of UNU-WIDER said the new estimates about the level of poverty in the world and the cost of the COVID-19 pandemic to the world's poor are sobering.

We cannot stand by and see the hard work and effort of so many be eradicated. We will know what the real impact is in time, but the necessary action to ensure we achieve the Sustainable Development Goals by 2030 needs to be planned now, Sen said.

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Agencies
April 14,2020

There is no evidence that the Bacille Calmette-Guerin (BCG) vaccine, which is primarily used against tuberculosis, protects people against infection with the novel coronavirus, the World Health Organization (WHO) said.

The WHO therefore didn't recommend BCG vaccination for the prevention of COVID-19 in the absence of evidence, according to its daily situation report on Monday, Xinhua news agency reported.

"There is experimental evidence from both animal and human studies that the BCG vaccine has non-specific effects on the immune system. These effects have not been well characterized and their clinical relevance remains unknown," WHO stated.

Two clinical trials addressing the question are underway, and WHO will evaluate the evidence when it is available, it noted.

BCG vaccination prevents severe forms of tuberculosis in children and diversion of local supplies may result in an increase of disease and deaths from the tuberculosis, it warned.

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Agencies
January 4,2020

Washington D.C., Jan 3: A new study has found out that diet significantly affects the mental health and well being of an individual.

The study was published in the journal European Neuropsychopharmacology.

"We have found that there is increasing evidence of a link between a poor diet and the worsening of mood disorders, including anxiety and depression. However, many common beliefs about the health effects of certain foods are not supported by solid evidence," said the lead researcher, Professor Suzanne Dickson.

According to the researchers, the link between diet and mental health can be firmly established in certain cases like that of the ability of a ketogenic diet being helpful for children with epilepsy and the impact of vitamin B12 deficiency on poor memory, depression and fatigue.

"With individual conditions, we often found very mixed evidence. With ADHD for example, we can see an increase in the quantity of refined sugar in the diet seems to increase ADHD and hyperactivity, whereas eating more fresh fruit and vegetables seems to protect against these conditions," said Dickson

But there are comparatively few studies, and many of them don't last long enough to show long-term effects," added Dickson.

The study further concludes that some food items can be associated with treatment and the betterment of certain mental health conditions.

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