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Comment by Dr. Krishna Kumari Challa on March 17, 2023 at 7:26am

A new way to remove waste from the brain after hemorrhage

Intracerebral hemorrhage, and bleeding into the brain tissue, is a devastating neurological condition affecting millions of people annually. It has a high mortality rate, while survivors are affected by long-term neurological deficits. No medication has been found to support brain recovery following hemorrhage.

In an international collaboration, researchers investigated whether a protein called cerebral dopamine neurotrophic factor (CDNF) has potential as a treatment for brain hemorrhage.

Researchers suggest that cerebral dopamine neurotrophic factor, a protein being currently tested for Parkinson's disease treatment, also has therapeutic effects and enhances immune cell's response after brain hemorrhage.

The authors found that the administration of cerebral dopamine neurotrophic factor accelerates hemorrhagic lesion resolution, reduces brain swelling, and improves functional outcomes in an animal model of brain hemorrhage.

They found that found that cerebral dopamine neurotrophic factor acts on immune cells in the bleeding brain, by increasing anti-inflammatory mediators and suppressing the production of the pro-inflammatory cytokines that are responsible for cell signaling. This is a significant step towards the treatment of injuries caused by brain hemorrhage, for which we currently have no cure.

The administration of cerebral dopamine neurotrophic factor also resulted in the alleviation of cell stress in the area that surrounds the hematoma.

Finally, the researchers demonstrated that systemic administration of cerebral dopamine neurotrophic factor promotes scavenging by the brain's immune cells after brain hemorrhage and has beneficial effects in an animal model of brain hemorrhage. 

Kuan-Yin Tseng et al, Augmenting hematoma-scavenging capacity of innate immune cells by CDNF reduces brain injury and promotes functional recovery after intracerebral hemorrhage, Cell Death & Disease (2023). DOI: 10.1038/s41419-022-05520-2

Comment by Dr. Krishna Kumari Challa on March 17, 2023 at 7:20am

Deactivating mosquito sperm: A human bite back!

New  research makes it likely that proteins responsible for activating mosquito sperm can be shut down, preventing them from swimming to or fertilizing eggs.

The study could help control populations of Culex, the common house mosquito that transmits brain-swelling encephalitis and West Nile Virus.

During mating, mosquitoes couple tail to tail, and the males transfer sperm into the female reproductive tract. It can be stored there awhile, but it still has to get from point A to point B to complete fertilization. 

Key to completing that journey are the specialized proteins secreted during ejaculation that activate the sperm flagella, or 'tails,' that power their movement.

Without these proteins, the sperm cannot penetrate the eggs. They'll remain immotile, and will eventually just degrade.

The study, detailed in the journal PLOS ONE, details a full portrait of all the proteins in the insect's sperm, allowing researchers to find the specific ones that maintain the quality of the sperm while they're inactive, and that also activate them to swim.

To get this detailed information the researchers  worked with a team of graduate and undergraduate students who isolated as many as 200 male mosquitoes from a larger population. They then extracted enough sperm from the tiny reproductive tracts for mass spectrometry equipment to detect and identify the proteins.

Previously, the team determined that sperm need calcium upon entering a reproductive tract to power forward motion. They can now look in the completed protein profile they've created, find the calcium channel proteins, and design experiments to target these channels.

This kind of protein profiling offers a path toward controlling mosquitoes that is more environmentally friendly than other methods that can have unintended, toxic effects. 

This  work sets the foundation for a form of biological control, which most would agree is preferable.

The operative word is control, rather than eradicate. Even though immobilizing the sperm would be 100% effective for the treated mosquitoes, it is not possible or desirable to kill all mosquitoes. This technology would change the proportion of fertile to infertile males in a given mosquito population, rather than wiping them all out.

The team is hoping that information about sperm motility regulators in Culex will also apply to other species of mosquitoes. And other pests too! What we learn in one system, such as mosquitoes, can translate to others.

Catherine D. Thaler et al, Using the Culex pipiens sperm proteome to identify elements essential for mosquito reproduction, PLOS ONE (2023). DOI: 10.1371/journal.pone.0280013

Comment by Dr. Krishna Kumari Challa on March 17, 2023 at 7:10am

Although mRNA vaccines have dominated the U.S. response to the pandemic, the technology underlying those shots is expensive. The finicky, temperature-sensitive ingredients required for mRNA vaccines may be difficult to store in far-flung regions of the globe. To address the global need for a low-cost vaccine that can be produced locally, scientists have been developing alternatives, such as NDV-HXP-S.

The vaccine's initials, NDV-HXP-S, stand for Newcastle disease virus, HexaPro, and spike protein. Producing the vaccine involves a vector, which in this case is the Newcastle disease virus, an agent that infects birds. The vaccine is manufactured by way of egg-based technology, which has been used for decades to produce annual flu shots. The Newcastle viral vector is not used in the production of influenza vaccines.

The vector works exquisitely well in the NDV-HXP-S production process, ferrying vaccine components into embryonated chicken eggs. The result, in the case of the vaccine used in Thailand, is an inactivated vaccine, which is a viral particle displaying SARS-C0V-2's spike protein on its surface.

"NDV-HXP-S can be used as a live vaccine or as an inactivated vaccine

The team analyzed antibody responses after Thai volunteers were vaccinated in the phase 1 clinical study. Researchers studied serum samples from 210 Thai volunteers who received either a placebo or the inactivated NDV-HXP-S vaccine.

They compared antibodies from the Thai volunteers to those from 20 people who received the Pfizer mRNA vaccine in New York City. Antibodies elicited by NDV-HXP-S tended to target the receptor binding domain of the virus rather than the spike protein's S2 subunit, the researchers found.

"Neutralizing activity of sera from NDV-HXP-S vaccinees was comparable to that of [Pfizer] vaccinees, whereas spike protein binding activity of the NDV-HXP-S vaccinee samples was lower than that of sera obtained from mRNA vaccines," the researchers say. This led them to calculate ratios between binding and neutralizing antibody titers.

This work show that a vaccine candidate that can be produced locally in [low- and middle-income countries] at low-cost induces neutralizing antibody titers to SARS-CoV-2 comparable to those observed in cohorts having received mRNA-based COVID-19 vaccines.

Juan Manuel Carreño et al, An inactivated NDV-HXP-S COVID-19 vaccine elicits a higher proportion of neutralizing antibodies in humans than mRNA vaccination, Science Translational Medicine (2023). DOI: 10.1126/scitranslmed.abo2847

Part 2

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Comment by Dr. Krishna Kumari Challa on March 17, 2023 at 7:07am

Study: Experimental COVID shot made via egg-based technology elicits higher antibody proportion than mRNA vax

An experimental COVID-19 vaccine produced with technology based on a decades-old method, elicited virus-neutralizing antibodies in higher proportion than the amount induced by mRNA immunizations, a Phase 1 clinical trial has found.

The investigational vaccine was developed in New York City and tested in Thailand where the shots were produced using a form of egg-based technology. The fact that researchers are still racing to develop new COVID-19 vaccines highlights an ongoing need, especially in low- and middle-income countries—and for good reason.

There is a need for SARS-CoV-2 vaccines that can be produced at low cost locally in low- and middle-income countries and this is one such experiment.

The study analyzed antibody responses elicited by the investigational vaccine known as NDV-HXP-S, which is produced in hens' eggs.

The research found that the investigational vaccine prompted a higher proportion of neutralizing antibodies against SARS-CoV-2 in volunteers compared with the proportion of neutralizing antibodies produced by a separate group of people who were vaccinated with Pfizer's mRNA vaccine.

A neutralizing antibody is one that defends healthy cells from a virus by neutralizing the pathogen's efforts to get inside. For instance, a neutralizing antibody can stop a virus from making a conformational change—swapping its structure for a new shape. Viral shape-shifting is a way to infect a cell.

Neutralizing antibodies differ from binding antibodies, which latch onto the pathogen and alert warrior cells of the immune system that a viral invasion is underway. While people who were vaccinated with NDV-HXP-S had a higher proportion of neutralizing antibodies, their binding to neutralizing antibody ratios were lower than those who were vaccinated with Pfizer's mRNA vaccine. When all variables were taken into account, the team concluded that the antibody responses between the two vaccines were comparable.

Findings from the research suggest that even in regions with previously limited vaccine-production infrastructure, it's possible to manufacture robust COVID shots at low cost. Western countries averse to technology sharing early in the pandemic, a factor that left scores of people in low- and middle-income countries with few opportunities for vaccination. Now, the tide is turning, albeit three years after the global SARS-CoV-2 pandemic was declared.

"Locally produced vaccines can increase vaccine access and vaccine independence, especially for low- and middle-income countries. The NDV-HXP-S vaccine is designed to help close this gap because it can be economically produced in influenza vaccine manufacturing plants that are located in [these countries]. Moreover, it can be stored and distributed without the need for freezers.

Part1

Comment by Dr. Krishna Kumari Challa on March 16, 2023 at 12:19pm

Where did Earth's water come from? Not melted meteorites, according to scientists

Water makes up 71% of Earth's surface, but no one knows how or when such massive quantities of water arrived on Earth.

A new study published in the journal Nature brings scientists one step closer to answering that question.

Researchers analyzed melted meteorites that had been floating around in space since the solar system's formation 4 1/2 billion years ago. They found that these meteorites had extremely low water content—in fact, they were among the driest extraterrestrial materials ever measured. These results, which let researchers rule them out as the primary source of Earth's water, could have important implications for the search for water—and life—on other planets. It also helps researchers understand the unlikely conditions that aligned to make Earth a habitable planet.

After analyzing the achondrite meteorite samples, researchers discovered that water comprised less than two millionths of their mass. For comparison, the wettest meteorites—a group called carbonaceous chondrites—contain up to about 20% of water by weight, or 100,000 times more than the meteorite samples.

This means that the heating and melting of planetesimals leads to near-total water loss, regardless of where these planetesimals originated in the solar system and how much water they started out with. Researchers discovered that, contrary to popular belief, not all outer solar system objects are rich in water. This led them to conclude that water was likely delivered to Earth via unmelted, or chondritic, meteorites.

Megan Newcombe, Degassing of early-formed planetesimals restricted water delivery to Earth, Nature (2023). DOI: 10.1038/s41586-023-05721-5. www.nature.com/articles/s41586-023-05721-5

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Comment by Dr. Krishna Kumari Challa on March 16, 2023 at 9:21am

Air travel: Turbulence increases as climate change becomes worse

Atmospheric turbulence accounts for 71% of in-flight weather-related injuries, and according to scientists turbulence is only worsening with global warming. While winter is typically the most turbulent season, modeling suggests that by the year 2050, summers will be as turbulent as winters were back in the 1950s.

The paper, "Clear‑air turbulence trends over the North Atlantic in high‑resolution climate models," has been published in the international journal Climate Dynamics.

Clear-air turbulence (CAT) is one of the more dangerous weather-related hazards. It usually develops in cloud-free environments of the upper-level atmosphere; offering no visual clues to pilots and undetectable by onboard radar, these events seemingly come out of nowhere. Prolonged exposure to turbulence will shorten the fatigue life, which is the time the aircraft can be in service. Aircraft fittings can be damaged and severe structural damage can result from more intense clear-air turbulence. In extremely rare cases, this could even lead to the break-up of the aircraft. During moderate turbulence, unrestrained items of cargo, passenger luggage or passengers themselves can collide, causing damage or injury.

The intensity of a jet stream depends on latitudinal horizontal temperature gradients. Due to the steepening of the pole-to-equator temperature gradient in the upper troposphere and lower stratosphere, jet streams are expected to intensify in wind shear with anthropogenic climate change.

The study used three global climate  modeling simulators covering the period 1950–2050 in the formation analysis.

Based on the assessment, for every 1 °C of global near-surface warming, moderate CAT events will increase by 14% in summer and autumn and by 9% for winter and spring. Moderate turbulence is described as inflicting vertical accelerations of up to 0.5g.

With increased turbulence in all seasons, more fights will encounter CAT events on current flight paths. One option for airlines will be to attempt to avoid areas where CAT forms. This might cause longer transatlantic flight times and thousands of additional hours of accumulated flight and fuel costs—a good reminder that the seatbelt sign is there for a reason, and keeping yours on even when the light is off might be the safest plan in the future.

Isabel H. Smith et al, Clear-air turbulence trends over the North Atlantic in high-resolution climate models, Climate Dynamics (2023). DOI: 10.1007/s00382-023-06694-x

Comment by Dr. Krishna Kumari Challa on March 16, 2023 at 9:10am

Comment by Dr. Krishna Kumari Challa on March 15, 2023 at 12:29pm

End the era of eponyms It’s time to axe the practice of naming species after individuals, say 11 ecologists and biologists. They admit that “any call for exceptional changes in how we name nature requires an exceptional rationale”. But they argue that ‘eponyms’ burden the foundation of taxonomy with po... — especially the residue of colonialism. For example, more than 60% of the eponyms given to the flora of New Caledonia are named for French citizens (and 94% of them honour men).

Comment by Dr. Krishna Kumari Challa on March 15, 2023 at 12:17pm

The FDA Just Approved The First Fast-Acting Nasal Spray For Migraines

The US Food and Drug Administration has approved a fast-acting nasal spray from Pfizer designed to treat migraines, the US pharmaceutical giant said Friday.

​Pfizer said it expected the drug, marketed under the name Zavzpret, to be available in pharmacies in July 2023.

​The FDA approval of Zavzpret marks a significant breakthrough for people with migraine who need freedom from pain and prefer alternative options to oral medications.

​A Phase 3 study of the drug found that it delivered pain relief to some migraine sufferers in as little as 15 minutes.

​As a nasal spray with rapid drug absorption, Zavzpret offers an alternative treatment option for people who need pain relief or cannot take oral medications due to nausea or vomiting.

​The treatment for a condition generally tackled with orally taken medicines was double-blind tested on a sample of 1,405 people, with half taking a single spray dose and the remainder receiving a placebo.

​The spray was found to reduce pain significantly when assessed two hours after the onset of a migraine, which as well as causing often severe headaches can include nausea and sensitivity to light or noise.

​Pfizer acquired Zavzpret, also known as Zavegepant, last year for some $10 billion from Biohaven, along with other migraine treatments from the firm.

​source: News agencies

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Comment by Dr. Krishna Kumari Challa on March 14, 2023 at 11:26am

Why do people pull their faces when applying make-up?

This is called 'Mascara Mouth' or 'Mascara face'. Intense focus, raised eyebrows, and a slightly open mouth, combine to create a familiar 'look' when trying to achieve the perfect lash.

‘Mascara face’, as it’s sometimes called, is thought to be a result of nerves in our brains cross-firing. The two nerves controlling our eyeball and eyelid movements are rooted in a very similar part of the brain to another nerve that controls the opening and closing of our jaw. So, it’s possible that when the two nerves in charge of eye movements are activated, they trigger off the nearby mouth-opening nerve.

This is only a theory, though. A simpler explanation is that we’ve learnt that opening our mouths stretches our skin, which helps with applying make-up, so people keep doing it.

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