Reversing insulin resistance in liver cells could treat type 2 diabetes

Although diabetes is a common condition, no cure exists yet. Current therapies can manage blood sugar levels, but they do not address insulin resistance. But now, recent research reported in ACS Nano shows that targeting certain highly reactive molecules in the liver can reverse insulin resistance in human liver cells and diabetic mice, providing a pathway toward a more long-lasting treatment.

Type 2 diabetes occurs when the body is no longer sensitive to insulin, which regulates blood sugar. Currently, no cure exists, and available treatments focus on managing symptoms and blood sugar levels. Some research has suggested that insulin resistance could be caused by reactive oxygen species (ROS), which are highly unstable, oxygen-based molecules primarily produced by the mitochondria, or the “powerhouses of the cell.” A class of drugs known as mitochondrial uncouplers could help inhibit ROS production at its source, rather than merely cleaning up what’s already been made, as conventional, antioxidant-based treatments do. Ultrasmall platinum nanoparticles are another highly efficient ROS scavenger, though their small size causes them to be cleared from the liver too quickly. But, by combining these two strategies into an all-in-one system, a highly effective and long-lasting treatment platform could be created. So, Jingjing Yang, Shaochun Tang, Yujun Song and colleagues wanted to design such a system, using biodegradable “nanoscavengers” that could potentially restore insulin sensitivity and treat type 2 diabetes.

To build the nanoscavengers, the team coated a template with platinum nanoparticles and a layer of silica. Then, the template was removed to form hollow shells, which were loaded with a mitochondrial uncoupler and coated with a lipid bilayer. When mixed with two ROS, hydrogen peroxide (H2O2) and superoxide (O2), the system reduced them to water and molecular oxygen. In experiments using human liver cells with induced type 2 diabetes, the nanoscavengers continued to clean up ROS, as well as increase glucose uptake, suggesting that the cells’ insulin sensitivity was restored. The researchers then injected nanoscavengers intravenously into a diabetic mouse model. The constructs migrated to the liver, reducing the amount of fat present, restoring normal cellular function and returning blood glucose levels to normal. Symptoms of diabetic nephropathy were reversed nearly completely. The mice showed no signs of body weight changes or damage to their tissues or organs. The researchers say that this work could provide an effective strategy for long-term treatment of diabetes and other metabolic diseases.

Ear acupuncture with beads may help shed the pounds

Small study finds 6 point stimulation of outer ear with simple metal beads helped reduce waist circumference, body fat and BMI in men living with obesity
Small study finds 6 point stimulation of outer ear with simple metal beads helped reduce waist circumference, body fat and BMI in men living with obesity

Ear acupuncture using metal beads can help reduce weight, body mass index (BMI), and body fat in combination with a restricted diet, according to new research being presented at this year’s European Congress on Obesity (ECO) in Dublin, Ireland (17-20 May).

The study by Dr Takahiro Fujimoto from Clinic F, Tokyo, Japan and colleagues suggests that food cravings can be controlled using the simpler method of acupuncture stimulation with beads rather than the traditional use of intradermal needles, which requires expert acupuncturists.

“Since these tiny metal beads are attached to six points on the outer ear that stimulate nerves and organs which regulate appetite, satiety and hunger, this type of acupuncture does not require complex knowledge or skill,” explains Dr Fujimoto. “In Japan, this method to aid weight loss has been used for over 30 years.”

In traditional Chinese medicine, acupuncture is based on the understanding that your health depends on the flow of qi (energy) in your body.

This energy travels along invisible pathways, known as meridians, that are found throughout your body, including your ears. A blocked or disrupted flow of qi can have a negative effect on your physical and mental health.

Auricular (ear) acupuncture therapy is based on the theory that the outer ear represents all parts of the body. Thin needles or beads are placed on certain points, usually along meridian lines, to restore the flow of qi by resolving any blockages or disruption and may help with a variety of health conditions.

The approach has been used to treat drug addiction and to help people give up smoking and lose weight.

While the mechanism is unclear, studies suggests that ear acupuncture may help to regulate the endocrine system, modulate metabolism, promote digestion, and lessen oxidative stress [1].

This new study builds on previous research in Japanese women with overweight or obesity which found that those treated with ear acupuncture with beads lost significantly more weight than those who were untreated, and this weight loss was maintained for 6 months after the end of treatment [2].

The new study in 81 Japanese men living with overweight or obesity (aged 21 to 78; average BMI 28.4 kg/m²) with high levels of unhealthy abdominal fat assessed auricular acupuncture with 1.5 mm metal ear beads on six points of the outer ear—shen-men, food pipe, upper stomach opening, stomach, lungs and endocrine system (see figure 1 in notes to editors).

The beads were placed on both ears and kept in place using surgical tape to ensure the participants were continuously receiving uniform pressure on each of the six acupuncture points. The beads were replaced twice a week during hospital visits. At the same time, participants were given guidance on diet and body weight was measured.

Participants were asked to reduce their total food intake by half during the 3 months of their treatment and kept food diaries.

All participants were weighed and measured at the start and end of treatment, including body weight, body fat percentage, fat mass, lean mass, muscle mass, BMI, and abdominal fat to see what impact auricular acupuncture with beads may have.

The study found substantial differences after 3 months, with participants losing 10.4cm off their waist circumference (from an average 98.4cm at the start of the study to 88cm) and 4% of total body fat (from average 28.2% to 24.3%).

Measures of unhealthy abdominal body fat also fell by on average 2 points (from 15.2 at the start of the study to 13 after 3 months—evaluated on a scale of 1 to 59; with a healthy visceral fat rating between 1 and 12, and excessive levels between 13 and 59), and BMI decreased by almost 3 points (average BMI 28.4kg/m² to 25.5 kg/m²)

“Our findings suggest that acupuncture on the ear may aid weight loss when paired with diet and exercise,” says Dr Fujimoto. “It’s likely that acupuncture has a positive effect by curbing cravings and appetite, improving digestion, and boosting metabolism.”

The authors note several limitations including that it is an observational study in a small group of Japanese men over a short time period and can’t prove causation.

Scientists identify antivirals that could combat emerging infectious diseases

A new study has identified potential broad-spectrum antiviral agents that can target multiple families of RNA viruses that continue to pose a significant threat for future pandemics. The study, led by Gustavo Garcia Jr. in the UCLA Department of Molecular and Medical Pharmacology, tested a library of innate immune agonists that work by targeting pathogen recognition receptors, and found several agents that showed promise, including one that exhibited potent antiviral activity against members of RNA viral families.

The ongoing SARS-CoV-2 pandemic, which has claimed nearly seven million lives globally since it began, has revealed the vulnerabilities of human society to a large-scale outbreak from emerging pathogens. While accurately predicting what will trigger the next pandemic, the authors say recent epidemics as well as global climate change and the continuously evolving nature of the RNA genome indicate that arboviruses, viruses spread by arthropods such as mosquitoes, are prime candidates. These include such as Chikungunya virus (CHIKV), Dengue virus, West Nile virus and Zika virus. The researchers write: “Given their already-demonstrated epidemic potential, finding effective broad-spectrum treatments against these viruses is of the utmost importance as they become potential agents for pandemics.”

In their new study, published in Cell Reports Medicine, researchers found that several antivirals inhibited these arboviruses to varying degrees. “The most potent and broad-spectrum antiviral agents identified in the study were cyclic dinucleotide (CDN) STING agonists, which also hold promise in triggering an immune defense against cancer,” said senior author Vaithi Arumugaswami, Associate Professor in the UCLA Department of Molecular and Medical Pharmacology.

“A robust host antiviral response induced by a single dose treatment of STING agonist cAIMP is effective in preventing and mitigating the debilitating viral arthritis caused by Chikungunya virus in a mouse model. This is a very promising treatment modality as Chikungunya virus-affected individuals suffer from viral arthritis years and decades from the initial infection,” Arumugaswami added.

“At molecular level, CHIKV contributes to robust transcriptional (and chemical) imbalances in infected skin cells (fibroblasts) compared to West Nile Virus and ZIKA Virus, reflecting a possible difference in the viral-mediated injury (disease pathogenesis) mechanisms by viruses belonging to different families despite all being mosquito-borne viruses,” said senior author Arunachalam Ramaiah, Senior Scientist in the City of Milwaukee Health Department.

“The study of transcriptional changes in host cells reveals that cAIMP treatment rescues (reverses) cells from the harmful effect of CHIKV-induced dysregulation of cell repair, immune, and metabolic pathways,” Ramaiah added.

More structure, fewer screens makes for healthier kids in the school holidays

Vacation care, sports programs, or performing arts – whatever your child’s interests, researchers say that adding structure to the school holiday is a great way to keep kids healthy and active over the break.

In the first Australian study of its kindUniversity of South Australia researchers found that when primary school children are on holidays, they’re less active, more likely to be on screens, and tend to have a worse diet than during the school term.

Assessing responses for 358 primary school students (Grade 4 and 5), researchers found that on holidays, children were likely to be 12 minutes less active each day, 27 minutes more sedentary, and have more than an hour extra of screen time.

During the school holidays, children (aged 9-10) spent 39 per cent more time using screens than during the school year.

UniSA researcher Dr Amanda Watson says children exercise less and eat more unhealthy food during the holidays, which may contribute to accelerated weight gain and poor health.

“Everyone is excited when school holidays come around – it’s a break from the daily routine, classrooms, and getting ready on time – but despite the obvious benefits, it can have some setback for kids,” Dr Watson says.

“Our study shows that during school holidays, children are more likely to display unhealthy behaviours, such as being less active, spending more time sitting, eating more junk food, and (perhaps unsurprisingly) watching a whole lot more TV or screens.

“Of course, it is important for children to get some quality downtime over the school break, but it’s equally important that they stay active and get enough exercise.

“If we add more structure to children’s days in the holidays – regular activities, planned lunch and snack breaks, as well as a limit on the amount of screen time kids have – we could encourage healthier behaviours to benefit them now and in the future.”

In Australia, one in four children (25 per cent) are overweight or obese, contributing to poorer health and wellbeing, as well as worse performance at school.

Senior researcher UniSA’s Professor Carol Maher says that screen time is one of the biggest risk factors for children’s inactivity.

“Managing screen time is a challenge for many parents, and not only in the holidays,” Prof Maher says.

“Being inactive for extended periods, either watching TV or playing games, is not good for anyone’s health, not the least children.

“So, when research shows us that even one extra hour of screen time a day corresponds with a 13 per cent increased risk of obesity, it is time to rethink computer time.

“Everyone can benefit from being more active. These holidays could be just what you need to make more positive changes to you and your children’s activity levels, overall wellbeing, and health.”

Therapy for babies with signs of autism cuts long-term disability costs. Do you think there is a problem with this model?

Baby child


Pre-emptive therapies can help babies showing early signs of autism. CREDIT “Baby Child” by Josh Willink is marked with CC0 1.0.

New research evaluating the potential cost savings of a therapy for babies displaying early autism signs has predicted a three dollar return to Australia’s National Disability Insurance Scheme (NDIS) for every dollar invested in therapy.

Published in the prestigious JAMA Network Open, the health economic study drew on the results of a landmark multi-centre randomised clinical trial which reported the world’s first evidence that a therapy commenced in infancy (iBASIS-VIPP)* could reduce early developmental disability to the point where a childhood clinical autism diagnosis was two-thirds less likely.

Now, researchers from the University of South Australia (UniSA) and Telethon Kids Institute, in partnership with the University of ManchesterLa Trobe UniversityGriffith University and the University of Western Australia, have used this clinical trial data to model downstream cost implications for children up to age 13.

Modelling downstream disability support costs to the NDIS system, they predicted that use of the iBASIS-VIPP therapy during infancy would return a net cost savings of $10,695 per child, representing a three-to-one return on investment by age 13.

Lead author, UniSA’s Professor Leonie Segal, Chair, Health Economics and Social Policy, says the estimated cost savings are conservative as they only covered support costs to the NDIS until a child turned 13, and did not consider cost savings to other systems (for example, health, education, parental employment).

“By investing in services early in life for babies showing early autism signs – and thereby reducing levels of disability – the study predicted a net cost savings of $10,695 per child by age 13 years,” Prof Segal, a health economist, says.

The modelling also predicted that savings in support costs associated with disability would balance out therapy costs shortly after the child turned five – just four years after delivery of the therapy.    

“The findings clearly argue the case that investing in early support for babies represents a good investment for the whole community.”

Telethon Kids Institute’s Prof Andrew Whitehouse – the Angela Wright Bennett Professor of Autism Research at Telethon Kids and the University of Western Australia and Director of CliniKids – says autism is not typically diagnosed until three years of age.

“However, therapies commencing during the first two years of life – when the initial signs of development difference are observed, and the brain is rapidly developing – can positively impact developmental outcomes in later childhood,” Prof Whitehouse says.

He says many services used the presence or absence of a diagnosis as a ‘trigger’ for funding and therapy, but this study reinforces the potential value of therapies prior to a diagnosis.

“Disability associated with autism has cost and quality of life implications for families and may result in extra government spending on areas such as health, education, disability services, and income support,” Prof Whitehouse says.

“Reducing disability associated with autism can relieve hardship to the individual, and in the process relieve costs to the individual, their family, and the broader systems that support them. At a time when NDIS sustainability is of great importance to everyone, these findings are very significant.”

Prof Segal says a challenge for health and disability systems globally is how to allocate finite funding to best support people with a disability, including autistic children and their families.

“Optimal resource allocation requires an understanding of the benefits versus costs of potential therapies, especially to inform at what age to provide supports,” she says.

“The study, together with the earlier work on which it builds, provides evidence that pre-emptive therapies are a feasible, effective and an efficient clinical pathway.”

Prof Whitehouse says given that in Australia more than a third of all participants in the NDIS have an autism diagnosis, the implications of these findings are enormous.

“I want to make it crystal clear that this is about finding the best use of funds to create the best outcomes for children,” he says.

“The discovery of therapies that reduce the disability experienced by children will often mean that that child requires fewer supports in later childhood. This is fantastic news for the child, their family and the systems that support kids and families.

“This study is about how to provide the right supports to kids and families at the right time and in the right amount. Understanding this is critical in helping to structure systems to support kids and families when they need it.”