Past studies have suggested that impaired biosynthesis could be the result of diverse mutations that hinder the foldability of proinsulin.

New York: The evolution of insulin in vertebrates — including humans — has encountered a roadblock, limiting its ability to adapt to obesity and thereby rendering most people vulnerable to Type 2 diabetes, a significant research has claimed.

Scientists from Indiana University (IU), University of Michigan and Case Western Reserve University determined that the sequence of insulin has become entrenched at the edge of impaired production — an intrinsic vulnerability unmasked by rare mutations in the insulin gene causing diabetes in childhood.

Insulin is produced by a series of highly specific processes that occur in specialised cells called beta cells.

A key step is the folding of a biosynthetic precursor, called proinsulin, to achieve the hormone’s functional three-dimensional structure.

Past studies have suggested that impaired biosynthesis could be the result of diverse mutations that hinder the foldability of proinsulin.

“Biological processes ordinarily evolve to be robust, and this protects us in the majority of cases from birth defects and diseases. Yet, diabetes seems to be an exception,” said Michael Weiss, Distinguished Professor at IU School of Medicine.

The group discovered that even the slightest variation of the insulin-sequencing process not only impairs insulin folding (and eventual insulin secretion) but also induces cellular stress that leads to beta cell dysfunction and eventually permanent damage.

The study, published in the Proceedings of the National Academy of Sciences, highlights the importance of folding efficiency as a critical but hidden factor in the evolution of insulin over the past 540 million years.

Humans have evolved to be vulnerable to diverse mutations in the insulin gene and that this vulnerability underlies a rare monogenic form of diabetes and provides an evolutionary backdrop to the present obesity-related diabetes pandemic.

“The authors highlight the fact that the insulin gene has been susceptible throughout evolution to mutations that impair insulin’s function or stress beta cells,” said Barbara Kahn from Harvard Medical School.

“As we approach the 100th anniversary of the discovery of insulin, these elegant observations might lead to a better understanding of the pathogenesis of Type 2 diabetes”.

The group will work to fully define the sequence determinants that make proinsulin foldable in beta cells.

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There is a rapid increase in the aging population worldwide. In the United Stated, estimates indicate that almost 40 percent of population in the country will be over 65 years of age by 2030.

As an individual lives longer, the person’s skin becomes biologically or chronologically aged and it gets exposed to several environmental factors, like sunlight. These factors can cause the skin some age-related damages.

Apart from environmental factors, the aging of a person’s skin greatly depends on their ethnicity, according to a study. The study found that genetic factors can delay aging in some people. For example, the African American population may experience aging much later than their white counterparts.

The review study published in the journal Clinics In Dermatology analyzed more than 40 articles published between 1970 and 2018 through PubMed. All the previous studies focussed on the association between skin aging and ethnicity.

The information in the articles suggested that environmental factors, such as ultraviolent rays from the sun, can damage all types of skin types. Among this damage caused from exposure to ultraviolet rays are loss of collagen, skin discoloration and skin cancer. But the effects of skin aging vary depending on the key differences in melanin and fibroblasts, the review study reported.

“Aging is inevitable, and each person will have a unique experience with how their skin changes as it ages,” study author Neelam Vashi, who is the director of the Center for Ethnic Skin at Boston Medical Center and an associate professor of dermatology at Boston University School of Medicine, said in a statement.

Fibroblasts, which is a type of cell that promote collagen production and wound healing, “account for increased skin thickness of African-American patients, resulting in wrinkles that appear several years later than (in their) white counterparts,” the research stated.

The study further stated that East Asian people are likely to experience hyper pigmentation early in the aging process, but the appearance of wrinkles will be delayed in them. Also, Hispanic people will experience delay in the appearance of wrinkles.

However, people of Caucasian descent, such as the North African, European and Southwest Asian ancestry, commonly have thinner skin. So, they experience loss of skin elasticity, wrinkles and reduced lip volume early in the aging process.

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New European research has found that exposure to air pollution and living in apartment blocks is linked with an increased risk of hypertension, also known as high blood pressure, which could also increase the risk of conditions such as heart disease, stroke, and type 2 diabetes.

Carried out by researchers at the Lithuanian University of Health Sciences and Vytautas Magnus University, Lithuania, the new study looked at 1,354 participants living in private houses or multi-story houses in Kaunas City, the second largest city of Lithuania with a population of around 280,000.

The researchers measured the participants’ exposure to particulate matter (PM10), fine particulate matter (PM2.5), which are particles smaller than 2.5 microns in diameter that can penetrate deeply into the respiratory tract, and nitrogen dioxide (NO2).

The team also investigated whether there was a link between participants’ distance to green spaces and major roads with the development of high blood pressure and some components of metabolic syndrome, a collection of conditions which together can increase the risk of heart disease, stroke, and diabetes.

These components included a high triglyceride level, a type of fat found in the blood, reduced high-density lipoprotein cholesterol, also known as the “good” cholesterol, higher blood glucose, and obesity.

The findings, published in the Journal of Public Health, showed that air pollution levels above the median appear to be associated with a higher risk of reduced high density lipoprotein, dubbed the “good” cholesterol.

Living closer than 200m to a major road and therefore being exposed to traffic pollution was also associated with reduced high-density lipoprotein cholesterol as well as high blood pressure and a higher triglyceride level. However, the negative impact of traffic air pollutants was observed only in the participants who lived in multi-storey apartment buildings, not in private houses.

On the other hand, the greenness, size, and type of open public spaces were found to be inversely related to the risk factors assessed, with the researchers emphasizing that natural green spaces could have a positive impact on cardiovascular health.

“Our research results enable us to say that we should regulate as much as possible the living space for one person in multifamily houses, improve the noise insulation of apartments, and promote the development of green spaces in multifamily houses,” said the study’s lead author, Agne Brazien.

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