Tuesday September 25, 2018

Using aspirin may reduce obesity’s effect on cancer, finds study

To study how obesity affects this defence mechanism, the team bred mice that were designed to express a known cancer-inducing mutant protein called Ras.

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To study how obesity affects this defense mechanism, the team bred mice that were designed to express a known cancer-inducing mutant protein called Ras.
Representational Image, Pixabay
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Aspirin, a medication used to treat pain, fever or inflammation, could significantly reduce the effects of obesity on cancer, suggests a study on mice.

Obesity is a known risk factor for certain types of cancer, including colon, pancreatic and breast cancer.

The new study, from Hokkaido University in Sapporo, Japan, showed that obesity could enhance cancer development by slowing down the key cancer defence mechanism.

“Epithelial” cells lining the surfaces of organs have the intrinsic ability to remove potentially malignant cells from their midst. This is called the “epithelial defense against cancer” mechanism.

Normally, the cells sense harmful cells and push them out by the process called cell competition.

Obesity is a known risk factor for certain types of cancer, including colon, pancreatic and breast cancer.
Medicines. Pixabay

“This is the first report to show that obesity and chronic inflammation can influence competitive interaction between normal cells and transformed cells,” said lead author Yasuyuki Fujita.

“It implies other factors such as infection, smoking, sleeping patterns and ageing may also affect cell competition,” Fujita added.

To study how obesity affects this defense mechanism, the team bred mice that were designed to express a known cancer-inducing mutant protein called Ras.

Epithelial cells usually remove the potentially malignant Ras-transformed cells.

Feeding the Ras mice high-fat diets, which resulted in severe obesity, suppressed the defense mechanism and therefore increased the number of Ras-transformed cells remaining in the tissue.

Also Read: Want to recall your dreams, vitamin B6 can help you 

This suppression was seen in the intestine and pancreas, but not in the lungs, the researchers noted.

A month later, the Ras-transformed cells developed a tumor in the pancreas of mice with the high-fat diet.

Further experiments using the mice model and cultured cells revealed that fatty acids and chronic inflammation cause the suppression of the defense mechanism.

However, when mice fed a high-fat diet were treated with aspirin, known for its anti-inflammatory properties, the defense mechanism was substantially enhanced.

This implies that reinforcing the epithelial defense mechanism with anti-inflammatory drugs could be utilized for cancer prevention, the researchers said. (IANS)

 

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Exposure to Certain Disinfectants Can Cause Obesity in Kids: Research

The use of eco-friendly products may be linked to healthier overall maternal lifestyles and eating habits.

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Disinfectants
How common household cleaners could make kids overweight. Flickr

Early life exposure to certain disinfectants used at home could be making children overweight by altering the composition of their gut bacteria, suggests new research.

Babies living in households that used eco-friendly cleaners had different microbiota and were less likely to be overweight as toddlers, showed the findings published in CMAJ (Canadian Medical Association Journal).

For the study, the researchers analysed the gut flora of 757 infants from the general population at age 3-4 months and weight at ages 1 and 3 years, looking at exposure to disinfectants, detergents and eco-friendly products used in the home.

Disinfectants
Mother’s Lifestyle Choices Linked to Obesity Risk in Adolescents. Pixabay

The researchers looked at data from the Canadian Healthy Infant Longitudinal Development (CHILD) birth cohort on microbes in infant fecal matter. They used World Health Organization growth charts for body mass index (BMI) scores.

Associations with altered gut flora in babies 3-4 months old were strongest for frequent use of household disinfectants such as multi-surface cleaners, which showed lower levels of Haemophilus and Clostridium bacteria but higher levels of Lachnospiraceae.

The researchers also observed an increase in Lachnospiraceae bacteria with more frequent cleaning with disinfectants.

They, however, did not find the same association with detergents or eco-friendly cleaners.

“We found that infants living in households with disinfectants being used at least weekly were twice as likely to have higher levels of the gut microbes Lachnospiraceae at age 3-4 months,” said Anita Kozyrskyj, Professor at the University of Alberta in Canada.

Disinfectants
The researchers looked at data from the Canadian Healthy Infant Longitudinal Development (CHILD) birth cohort on microbes in infant fecal matter. Flcikr

“When they were 3 years old, their body mass index was higher than children not exposed to heavy home use of disinfectants as an infant,” Kozyrskyj said.

“Those infants growing up in households with heavy use of eco cleaners had much lower levels of the gut microbes Enterobacteriaceae,” she said.

Also Read: Asthma Ups The Chance of Obesity: Study

Kozyrskyj suggests that the use of eco-friendly products may be linked to healthier overall maternal lifestyles and eating habits, contributing in turn to the healthier gut microbiomes and weight of their infants. (IANS)