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Comment by Dr. Krishna Kumari Challa on January 5, 2021 at 9:38am

Scientists discover how mother-of-pearl self-assembles into a perfect structure

In a new study published in Nature Physics, researchers from the B CUBE—Center for Molecular Bioengineering at TU Dresden and European Synchrotron Radiation Facility (ESRF) in Grenoble describe, for the first time, that structural defects in self-assembling nacre attract and cancel each other out, eventually leading to a perfect periodic structure.

Mollusks build shells to protect their soft tissues from predators. Nacre, also known as the mother of pearl, has an intricate, highly regular structure that makes it an incredibly strong material. Depending on the species, nacres can reach tens of centimeters in length. No matter the size, each nacre is built from materials deposited by a multitude of single cells at multiple different locations at the same time. How exactly this highly periodic and uniform structure emerges from the initial disorder was unknown until now.

Nacre formation starts uncoordinated with the cells depositing the material simultaneously at different locations. Not surprisingly, the early nacre structure is not very regular. At this point, it is full of defects.

Dynamics of topological defects and structural synchronization in a forming periodic tissue, Nature Physics (2021). DOI: 10.1038/s41567-020-01069-z , www.nature.com/articles/s41567-020-01069-z

https://phys.org/news/2021-01-scientists-mother-of-pearl-self-assem...

Comment by Dr. Krishna Kumari Challa on January 5, 2021 at 9:34am

Study explains why patients with cancer spread to the liver have worse outcomes

Medical Researchers often noticed that when  patients had cancer that spread to the liver, they fared poorly—more so than when cancer spread to other parts of the body. Not only that, but transformative immunotherapy treatments had little impact for these patients.

Uncovering the reason and a possible solution, a new study, published in Nature Medicine, finds that tumors in the liver siphon off critical immune cells, rendering immunotherapy ineffective. But coupling immunotherapy with radiotherapy to the liver in mice restored the immune cell function and led to better outcomes.

Liver metastasis restrains immunotherapy efficacy via macrophage-mediated T cell elimination, Nature Medicine (2021). DOI: 10.1038/s41591-020-1131-x , www.nature.com/articles/s41591-020-1131-x

https://medicalxpress.com/news/2021-01-patients-cancer-liver-worse-...

Comment by Dr. Krishna Kumari Challa on January 5, 2021 at 9:29am

Brain cancer linked to tissue healing

The healing process that follows a brain injury could spur tumor growth when new cells generated to replace those lost to the injury are derailed by mutations, Toronto scientists have found. A brain injury can be anything from trauma to infection or stroke.

The data suggest that the right mutational change in particular cells in the brain could be modified by injury to give rise to a tumour.

The findings could lead to new therapy for glioblastoma patients who currently have limited treatment options with an average lifespan of 15 months after diagnosis.

The researchers applied the latest single-cell RNA sequencing and machine learning technologies to map the molecular make-up of the glioblastoma stem cells (GSCs), which Dirks' team previously showed are responsible for tumor initiation and recurrence after treatment.

They found new subpopulations of GSCs which bear the molecular hallmarks of inflammation and which are comingled with other cancer stem cells inside patients' tumors. It suggests that some glioblastomas start to form when the normal tissue healing process, which generates new cells to replace those lost to injury, gets derailed by mutations, possibly even many years before patients become symptomatic.

 Gradient of Developmental and Injury Response transcriptional states defines functional vulnerabilities underpinning glioblastoma heterogeneity, Nature Cancer (2021). DOI: 10.1038/s43018-020-00154-9 , www.nature.com/articles/s43018-020-00154-9

https://medicalxpress.com/news/2021-01-brain-cancer-linked-tissue.h...

Comment by Dr. Krishna Kumari Challa on January 5, 2021 at 9:25am

Stopping SARS-CoV-2 in its tracks by blocking its main protease

Inasmuch as therapeutic options against coronavirus have been focused mainly on blocking the interaction between its spike protein and the ACE2 receptor on host cells, SARS-CoV-2 has several additional critical proteins that could potentially be targeted with drugs that have already been approved for use against other viruses. One of these viral proteins is the main protease (Mpro) that is needed to separate newly minted polypeptides into their functional component parts.

Scientists from the Department of Biophysics at the All India Institute of Medical Sciences have recently put several promising inhibitors of Mpro through the paces to see what sticks. Their findings, appearing in the American Chemical Society's journal ACS Omega, suggest that an HIV drug known as cobicistat is looking pretty good.

Akshita Gupta et al. Structure-Based Virtual Screening and Biochemical Validation to Discover a Potential Inhibitor of the SARS-CoV-2 Main Protease, ACS Omega (2020). DOI: 10.1021/acsomega.0c04808

https://phys.org/news/2021-01-sars-cov-tracks-blocking-main-proteas...

Comment by Dr. Krishna Kumari Challa on January 5, 2021 at 9:21am

Opening a new door into kinder, gentler therapies for chronic inflammation

A naturally occurring antibody capable of stimulating the body's immune-suppressing regulatory T cells has been discovered by a team of Harvard scientists, a finding that may eventually open a new door into kinder, gentler therapies for chronic inflammatory disorders.

Inflammation underlies a wide range of disparate conditions that include Crohn's disease; atopic dermatitis and numerous autoimmune skin disorders, including psoriasis; rheumatoid arthritis and ulcerative colitis, to name a few.

Biologic treatments that have been developed over the past quarter-century have proved to be game-changers, but the drugs are imperfect and leave some patients vulnerable to opportunistic infections, and in rare instances, cancers of the blood. Clearly, there is room for improvement, immunologists worldwide contend.

The newly identified antibody is noteworthy because of its activity on regulatory T cells. The tiny antibody actually expands the overall number of highly potent regulatory T cells, a cell population that bears the responsibility of switching off inflammation. The antibody was discovered by a team of scientists from the Immunobiology Laboratory of Massachusetts General Hospital and Harvard Medical School. They describe the antibody's role as not only unique, but possessing properties that allow it leverage over key components of the immune system.

 Heather Torrey et al. A novel TNFR2 agonist antibody expands highly potent regulatory T cells, Science Signaling (2020). DOI: 10.1126/scisignal.aba9600

https://medicalxpress.com/news/2021-01-door-kinder-gentler-therapie...

Comment by Dr. Krishna Kumari Challa on January 4, 2021 at 11:55am

The Insane Biology of: The Octopus

Comment by Dr. Krishna Kumari Challa on January 4, 2021 at 11:53am

Discovery: How potato beetles beat pesticides

Potato beetles can beat pesticides cleverly. Even small doses of the neonicotinoid pesticide, imidacloprid, can alter how the beetle manages its DNA. To fend off the pesticides, the new research suggests, the beetle may not need to change its underlying genetic code. Instead, the team found that beetles respond by altering the regulation of their DNA, turning certain genes on or off in a process called “DNA methylation." These so-called epigenetic changes allow beetles to quickly ramp up biological defense mechanisms—perhaps putting into overdrive already-existing genes that allow the beetle to tolerate a broad range of toxins found in potato plants.

A flush of enzymes or faster rate of excretion may let the insect stymie each new pesticide with the same ancient biochemical tools that it uses to overcome natural plant defenses—rather than relying on the ponderous evolutionary process of random mutations appearing in key genes, that would slowly cause a pesticide to become less effective.

Most important, the new study shows that these changes—triggered by even small doses of the pesticide—can be passed on to descendants across at least two generations. 

https://researchnews.cc/news/4423/Discovery--How-colorado-potato-be...

Comment by Dr. Krishna Kumari Challa on January 3, 2021 at 1:30pm

How Scientists, unlike people who do their own research on the net, Know The Approved COVID-19 Vaccines Are Safe

https://www.sciencealert.com/how-scientists-know-the-approved-covid...

Comment by Dr. Krishna Kumari Challa on January 2, 2021 at 7:21am

Desalination breakthrough could lead to cheaper water filtration

Producing clean water at a lower cost could be on the horizon after researchers from The University of Texas at Austin and Penn State solved a complex problem that had baffled scientists for decades, until now. Desalination membranes remove salt and other chemicals from water, a process critical to the health of society, cleaning billions of gallons of water for agriculture, energy production and drinking. The idea seems simple  push salty water through and clean water comes out the other side  but it contains complex intricacies that scientists are still trying to understand. The research team, in partnership with DuPont Water Solutions, solved an important aspect of this mystery, opening the door to reduce costs of clean water production. The researchers determined desalination membranes are inconsistent in density and mass distribution, which can hold back their performance. Uniform density at the nanoscale is the key  to increasing how much clean water these membranes can create.

The paper documents an increase in efficiency in the membranes tested by 30%-40%, meaning they can clean more water while using significantly less energy. That could lead to increased access to clean water and lower water bills for individual homes and large users alike.

Reverse osmosis membranes work by applying pressure to the salty feed solution on one side. The minerals stay there while the water passes through. Although more efficient than non-membrane desalination processes, it still takes a large amount of energy, the researchers said, and improving the efficiency of the membranes could reduce that burden.

https://news.utexas.edu/2020/12/31/desalination-breakthrough-could-...

https://researchnews.cc/news/4396/Desalination-breakthrough-could-l...

Comment by Dr. Krishna Kumari Challa on January 1, 2021 at 11:23am

Multiple mosquito blood meals accelerate malaria transmission

Multiple bouts of blood feeding by mosquitoes shorten the incubation period for malaria parasites and increase malaria transmission potential, according to a study published recently.  Given that mosquitoes feed on blood multiple times in natural settings, the results suggest that malaria elimination may be substantially more challenging than suggested by previous experiments, which typically involve a single blood meal.

The results show that an additional blood feed three days after infection with P. falciparum accelerates the growth of the malaria parasite, thereby shortening the incubation period required before transmission to humans can occur. Incorporating these data into a mathematical model across sub-Saharan Africa reveals that malaria transmission potential is likely higher than previously thought, making disease elimination more difficult. In addition, parasite growth is accelerated in genetically modified mosquitoes with reduced reproductive capacity, suggesting that control strategies using this approach, with the aim of suppressing Anopheles populations, may inadvertently favor malaria transmission. The data also suggest that parasites can be transmitted by younger mosquitoes, which are less susceptible to insecticide killing, with negative implications for the success of insecticide-based strategies. Taken together, the results suggest that younger mosquitoes and those with reduced reproductive ability may provide a larger contribution to infection than previously thought.

Shaw WR, Holmdahl IE, Itoe MA, Werling K, Marquette M, Paton DG, et al. (2020) Multiple blood feeding in mosquitoes shortens the Plasmodium falciparum incubation period and increases malaria transmission potential. PLoS Pathog 16(12): e1009131. DOI: 10.1371/journal.ppat.1009131

https://medicalxpress.com/news/2020-12-multiple-mosquito-blood-meal...

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