Tag: 30/10/23

Categories : Metabolic DisordersTags : Leave a comment

Study Shows Intermittent Fasting Effective in Type 2 Diabetes

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Photo by Photomix Company on Pexels

Time-restricted eating, also known as intermittent fasting, can help people with Type 2 diabetes lose weight and control their blood sugar levels, according to a new study published in JAMA Network Open from researchers at the University of Illinois Chicago.

Participants who ate only during an eight-hour window between noon and 8 pm each day actually lost more weight over six months than participants who were instructed to reduce their calorie intake by 25%. Both groups had similar reductions in long-term blood sugar levels, as measured by a test of haemoglobin A1C, which shows blood sugar levels over the past three months.

The study was conducted at UIC and enrolled 75 participants into three groups: those who followed the time-restricted eating rules, those who reduced calories and a control group. Participants’ weight, waist circumference, blood sugar levels and other health indicators were measured over the course of six months.

Senior author Krista Varady said that participants in the time-restricted eating group had an easier time following the regime than those in the calorie-reducing group. The researchers believe this is partly because patients with diabetes are generally told to cut back on calories by their doctors as a first line of defence, so many of these participants likely had already tried, and struggled with, that form of dieting. And while the participants in the time-restricted eating group were not instructed to reduce their calorie intake, they ended up doing so by eating within a fixed window.

“Our study shows that time-restricted eating might be an effective alternative to traditional dieting for people who can’t do the traditional diet or are burned out on it,” said Varady, a professor of kinesiology and nutrition. “For many people trying to lose weight, counting time is easier than counting calories.”

There were no serious adverse events reported during the six-month study. Occurrences of hypoglycaemia and hyperglycaemia did not differ between the diet groups and control groups.

Just over half the participants in the study were Black and another 40% were Hispanic. This is notable as diabetes is particularly prevalent among those groups, so having studies that document the success of time-restricted eating for them is particularly useful, the researchers said.

The study was small and should be followed up by larger ones, said Varady, who is also a member of the University of Illinois Cancer Center. While it acts as a proof of concept to show that time-restricted eating is safe for those with Type 2 diabetes, Varady said people with diabetes should consult their doctors before starting this sort of diet.

Source: University of Illinois Chicago

Categories : COVIDTags : Leave a comment

Which Entryway a Coronavirus Uses Affects its Infection Severity

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Image by Fusion Medical on Unsplash

Until now, the reason why some coronaviruses such as SARS-CoV-2 affect humans more severely than other seasonal ones has eluded scientists. Now, results published in Nature have provided a piece of the puzzle by identifying a gateway used by the seasonal coronavirus HKU1 to enter human cells. HKU1 binds to a different receptor than SARS-CoV-2, which may partly explain the difference in severity between these two coronaviruses.

Receptors provide a useful means of figuring out coronavirus transmissibility and pathology as part of surveillance work on viral evolution. Seven coronaviruses are known for their ability to infect humans. Four of these are generally mild: HKU1, 229E, NL63 and OC43, while the other three are more pathogenic: SARS-CoV-1, Mers-CoV and SARS-CoV-2.

The HKU1 virus was first identified in an elderly patient with severe pneumonia in Hong Kong in 2005. Like SARS-CoV-2, HKU1 mainly infects upper respiratory tract cells. However, it rarely affects the bronchi and alveoli in the lungs. The HKU1 virus causes colds and other mild respiratory symptoms. Complications may also occur, including severe respiratory tract infections, particularly in young children, the elderly and immunocompromised individuals. It is estimated that 70% of children are infected before the age of 6. In total, 75 to 95% of the global population has been exposed to HKU1, which is comparable to other seasonal human coronaviruses.

At the cellular level, coronavirus spike proteins are cleaved after binding to their receptors. This cleavage phenomenon is vital for viral fusion, entry and multiplication. Some coronaviruses (SARS-CoV-2 and NL63) use the ACE2 receptor as a gateway for entering cells. Until now, HKU1 and OC43 were the only coronaviruses with unknown receptors.

Through collaboration between scientists at eight Institut Pasteur units, it was possible to identify the TMPRSS2 enzyme as the receptor to which HKU1 binds to enter cells. Once binding has occurred, TMPRSS2 triggers fusion of HKU1 with the cell, leading to viral infection. Through a combination of techniques performed in vitro and in cell culture, the scientists demonstrated that the TMPRSS2 receptor has high affinity with the HKU1 spike, which is not the case for SARS-CoV-2.

“Once a receptor has been identified for a virus, it is possible to characterise target cells more accurately, while also gaining insights on viral entry and multiplication mechanisms and infection pathophysiology,” comments, Olivier Schwartz, co-last author of the study and Head of the Institut Pasteur’s Virus and Immunity unit.

“Our findings also shed light on the various evolution strategies employed by coronaviruses, which use TMPRSS2 either to bind to target cells or trigger fusion and viral entry,” adds Julian Buchrieser, co-last author of the study and scientist in the Institut Pasteur’s Virus and Immunity unit.

These human-pathogenic viruses’ use of different receptors probably affects their degree of severity. Receptor levels vary among respiratory tract cells, thus influencing the sensitivity of cells to infection and viral spread. Once the route of viral entry into cells is known, it should also be possible to fight infection more effectively by developing targeted therapies and assess the risk of virulence posed by any future emerging coronaviruses.

In parallel with this work, Institut Pasteur teams led by Pierre Lafaye and Felix Rey have developed and characterised nano-antibodies (very small antibodies) that inhibit HKU1 infection by binding to the TMPRSS2 receptor. These reagents have been patented for potential therapeutic activities.

Source: Institut Pasteur

Categories : Healthcare Politics and Regulations Medical IndustryTags : Leave a comment

Life-saving TB Drug is Now Cheaper in South Africa – But Not as Cheap as It can be

On By ModernMedia
Diagram by the United States-based National Institute of Allergy and Infectious Diseases showing the medicine options for drug-resistant tuberculosis. (Via Flickr, CC BY 2.0 Deed)

By Daniel Steyn for GroundUp

The South African government and pharmaceutical company Johnson & Johnson (J&J) have agreed to a lower price for bedaquiline, a medicine used to treat drug-resistant tuberculosis (DR-TB) in South Africa.

This comes off the back of mounting pressure from activists and amid an ongoing investigation by the Competition Commission, looking into J&J’s pricing of the drug.

An estimated 14 000 people in South Africa fell ill with DR-TB in 2019. Bedaquiline is one of the main drugs used to treat DR-TB. Before bedaquiline became available, treatment for DR-TB would consist of up to two years of injections with serious side effects. The bedaquiline-containing regimen has no injectables, far fewer side effects and is typically six months. 

Bedaquiline has been provided by the South African government since 2018.

In July, J&J agreed to sell bedaquiline to lower and middle-income countries through the Stop TB Partnership’s Global Drug Facility for $130 (R2470) per six-month regime, but South Africa does not make use of this facility due to national procurement policies.

Instead, about the same time that J&J made this announcement, the National Health Department agreed to pay J&J R5500 for the drug.

The Competition Commission announced in September that it will be investigating Johnson & Johnson’s pricing of the drug. The commission assisted the Department of Health in renegotiating the price, says department spokesperson Foster Mohale.

This week the department sent out a circular indicating that it will be paying R3,148 for bedaquiline.

Bedaquiline is prescribed to 7000 to 8000 people a year, Mohale told GroundUp. Mohale says the new price amounts to a 40% saving on bedaquiline for the next two years.

Candice Sehoma, Access Campaign Advocacy Advisor for Medicines Sans Frontiere (MSF), told GroundUp that the “momentous” cost saving is a “big achievement”. Sehoma says it is a sign that the global campaign to ensure accessible and affordable treatment for TB is yielding results.

MSF has estimated that bedaquiline could be manufactured and sold for profit for as little as $102 (R1940).

Fatima Hassan, director of the Health Justice Initiative, says that while the price drop is a victory, it is important to ensure that this does not happen again.

“The significant price reduction emphasises why price scrutiny is significant,” Hassan told GroundUp.

Alleged “evergreening”

J&J’s patent for bedaquiline expired in July 2023, but J&J had already applied for a new patent for a slightly different version of bedaquiline, which was granted. This meant their patent protection continued in South Africa after the original patent expired.

This amounts to “evergreening”, says Hassan. Evergreening, as explained in this article in The Conversation, “is achieved by seeking extra patents on variations of the original drug – new forms of release, new dosages, new combinations or variations, or new forms”.

The Competition Commission will be looking into J&J’s alleged “evergreening” as part of its investigation.

After making its agreement with the Global Drug Facility, J&J has announced it will not be enforcing the new patent – a move that will allow generic versions of the product to enter the market and further lower the price.

GroundUp sent questions to J&J but received no response.

Republished from GroundUp under a Creative Commons Attribution-NoDerivatives 4.0 International License.

Source: GroundUp

Categories : DermatologyTags : Leave a comment

Study Reveals a Touchy Secret in Hair Follicles

On By ModernMedia
Photo by Tobias Aeppli

Imperial researchers have discovered a hidden mechanism within hair follicles that allows the sensation of touch. Previously, touch was thought to be detected only by nerve endings present within the skin and surrounding hair follicles. This new research from Imperial College London has found that that cells within hair follicles (the structures surrounding the hair fibre) are also able to detect the sensation in cell cultures.

The researchers also found that these hair follicle cells release the neurotransmitters histamine and serotonin in response to touch. These findings, published in Science Advances, might help us in future to understand histamine’s role in inflammatory skin diseases like atopic dermatitis.

Lead author of the paper Dr Claire Higgins, from Imperial’s Department of Bioengineering, said: “This is a surprising finding as we don’t yet know why hair follicle cells have this role in processing light touch. Since the follicle contains many sensory nerve endings, we now want to determine if the hair follicle is activating specific types of sensory nerves for an unknown but unique mechanism.”

A touchy subject

We feel touch using several mechanisms: sensory nerve endings in the skin detect touch and send signals to the brain; richly innervated hair follicles detect the movement of hair fibres; and sensory nerves known as C-LTMRs, that are only found in hairy skin, process emotional, or ‘feel-good’ touch.

Now, researchers may have uncovered a new process in hair follicles. To carry out the study, the researchers analysed single cell RNA sequencing data of human skin and hair follicles and found that hair follicle cells contained a higher percentage of touch-sensitive receptors than equivalent cells in the skin.

They established co-cultures of human hair follicle cells and sensory nerves, then mechanically stimulated the hair follicle cells, finding that this led to activation of the adjacent sensory nerves.

They then decided to investigate how the hair follicle cells signalled to the sensory nerves. They adapted a technique known as fast scan cyclic voltammetry to analyse cells in culture and found that the hair follicle cells were releasing the neurotransmitters serotonin and histamine in response to touch.

When they blocked the receptor for these neurotransmitters on the sensory neurons, the neurons no longer responded to the hair follicle cell stimulation. Similarly, when they blocked synaptic vesicle production by hair follicle cells, they were no longer able to signal to the sensory nerves.

They therefore concluded that in response to touch, hair follicle cells release that activate nearby sensory neurons.

The researchers also conducted the same experiments with cells from the skin instead of the hair follicle. The cells responded to light touch by releasing histamine, but they didn’t release serotonin.

Dr Higgins said: “This is interesting as histamine in the skin contributes to inflammatory skin conditions such as eczema, and it has always been presumed that immune cells release all the histamine. Our work uncovers a new role for skin cells in the release of histamine, with potential applications for eczema research.”

The researchers note that the research was performed in vitro, and will need to be replicated in vivo The researchers also want to determine if the hair follicle is activating specific types of sensory nerves. Since C-LTMRs are only present within hairy skin, they are interested to see if the hair follicle has a unique mechanism to signal to these nerves that we have yet to uncover.

Source: Imperial College London

Categories : Ethics and LawTags : 1 Comment

Terminally Ill Patients Need More than Prayer from Spiritual Leaders

On By ModernMedia
Photo by Rodnae Productions on Pexels

A study conducted among advanced cancer patients in Soweto has found that most patients who received palliative care and are at the end of life, have spiritual needs beyond regular prayers from spiritual leaders. Furthermore, patients who received religious or spiritual care had less physical pain, used less morphine and had higher odds of dying where they wish than those who did not.

The study involving 233 participants was conducted by a team of local and international experts led by Wits researchers.

Lead researcher Dr Mpho Ratshikana-Moloko from the Centre for Palliative Care in the Faculty of Health Sciences at Wits University says that previous research has shown that religion and spirituality are important to most patients facing life-threatening illnesses. However, this study probed further.

Using the African Palliative Care Association Palliative Outcome Scale, the research confirmed previous international findings that nearly 98% of the participants had a religious or spiritual need.

The most common spiritual need expressed by patients in Soweto was “seeking a closer connection with their God” and “forgiveness for sins”, says Ratshikana-Moloko. This finding is of significance because it calls on faith leaders to provide relevant support that responds to the needs of patients. This research-led intervention empowers leaders to move beyond prayer, explains Ratshikana-Moloko.

“This is the first study to assess the spiritual and religious needs, and religious and spirituality care provided to advanced cancer patients who received palliative care in Soweto,” says Ratshikana-Moloko.

Since the study was concluded in 2018, Wits University has developed a course in Spiritual and Chaplaincy in Palliative Care. The first cohort of faith leaders from all religious backgrounds completed in September 2023.

Palliative care to increase

Palliative care is one of the key pillars in illness management among terminally ill patients who are judged by a specialist physician as unlikely to benefit from curative-intent therapy. Often, patients are unlikely to survive beyond six months.

The South African National Policy Framework and Strategy for Palliative Care (2017–2022) incorporates spirituality into health care. However, palliative care services in South and southern Africa and elsewhere, rarely address these needs, despite available policies, guidelines and evidence.

“We have to implement what we know. The integration of spiritual care within the clinical care setting is recommended,” Ratshikana-Moloko.

South Africa faces a heavy burden of communicable and non-communicable diseases. One in six deaths globally is due to cancer, and cancer diagnoses are expected to increase by 70% in the next two decades, especially in low- and middle-income countries.

“Failure to identify and address the religious and spiritual needs of terminally-ill patients may increase distress and suffering,” Ratshikana-Moloko.