Comment

Comment by Dr. Krishna Kumari Challa on December 23, 2023 at 9:26am

The discovery of megakaryocytes and blood stem cells in the lung raised questions about how these cells move back and forth between the lung and bone marrow. To address these questions, the researchers conducted a clever set of lung transplant studies:

First, the team transplanted lungs from normal donor mice into recipient mice with fluorescent megakaryocytes, and found that fluorescent megakaryocytes from the recipient mice soon began turning up in the lung vasculature. This suggested that the platelet-producing megakaryocytes in the lung originate in the bone marrow.

It’s fascinating that megakaryocytes travel all the way from the bone marrow to the lungs to produce platelets. It’s possible that the lung is an ideal bioreactor for platelet production because of the mechanical force of the blood, or perhaps because of some molecular signaling we don’t yet know about.

In another experiment, the researchers transplanted lungs with fluorescent megakaryocyte progenitor cells into mutant mice with low platelet counts. The transplants produced a large burst of fluorescent platelets that quickly restored normal levels, an effect that persisted over several months of observation — much longer than the lifespan of individual megakaryocytes or platelets. To the researchers, this indicated that resident megakaryocyte progenitor cells in the transplanted lungs had become activated by the recipient mouse’s low platelet counts and had produced healthy new megakaryocyte cells to restore proper platelet production.

Finally, the researchers transplanted healthy lungs in which all cells were fluorescently tagged into mutant mice whose bone marrow lacked normal blood stem cells. Analysis of the bone marrow of recipient mice showed that fluorescent cells originating from the transplanted lungs soon traveled to the damaged bone marrow and contributed to the production not just of platelets, but of a wide variety of blood cells, including immune cells such as neutrophils, B cells and T cells. These experiments suggest that the lungs play host to a wide variety of blood progenitor cells and stem cells capable of restocking damaged bone marrow and restoring production of many components of the blood.

To our knowledge this is the first description of blood progenitors resident in the lung, and it raises a lot of questions with clinical relevance for the millions of people who suffer from thrombocytopenia.

Part 2

Comment by Dr. Krishna Kumari Challa on December 23, 2023 at 9:23am

Surprising New Role for Lungs: Making Blood

Cells in Mouse Lungs Produce Most Blood Platelets and Can Replenish Blood-Making Cells in Bone Marrow, Study Shows

Using video microscopy in the living mouse lung, UC San Francisco scientists have revealed that the lungs play a previously unrecognized role in blood production. As reported online March 22, 2017, in Nature, the researchers found that the lungs produced more than half of the platelets – blood components required for the clotting that stanches bleeding – in the mouse circulation.

In another surprise finding, the scientists also identified a previously unknown pool of blood stem cells capable of restoring blood production when the stem cells of the bone marrow, previously thought to be the principal site of blood production, are depleted.

This finding definitely suggests a more sophisticated view of the lungs – that they’re not just for respiration but also a key partner in formation of crucial aspects of the blood. What scientists  observed  in mice strongly suggests the lung may play a key role in blood formation in humans as well.

The findings could have major implications for understanding human diseases in which patients suffer from low platelet counts, or thrombocytopenia, which afflicts millions of people and increases the risk of dangerous uncontrolled bleeding. The findings also raise questions about how blood stem cells residing in the lungs may affect the recipients of lung transplants.

Lungs Produce More Than 10 Million Platelets Per Hour

The new study was made possible by a refinement of a technique known as two-photon intravital imaging recently . This imaging approach allowed the researchers to perform the extremely delicate task of visualizing the behavior of individual cells within the tiny blood vessels of a living mouse lung.

Researchers were using this technique to examine interactions between the immune system and circulating platelets in the lungs. Using a mouse strain engineered so that platelets emit bright green fluorescence,  they noticed a surprisingly large population of platelet-producing cells called megakaryocytes in the lung vasculature. Though megakaryocytes had been observed in the lung before, they were generally thought to live and produce platelets primarily in the bone marrow.

More detailed imaging sessions soon revealed megakaryocytes in the act of producing more than 10 million platelets per hour within the lung vasculature, suggesting that more than half of a mouse’s total platelet production occurs in the lung, not the bone marrow, as researchers had long presumed. Video microscopy experiments also revealed a wide variety of previously overlooked megakaryocyte progenitor cells and blood stem cells sitting quietly outside the lung vasculature – estimated at 1 million per mouse lung.

Part 1

Comment by Dr. Krishna Kumari Challa on December 22, 2023 at 11:46am

Scientists question nematode cancer tests

Doctors have raised concerns that a commercial cancer test produces higher levels of false negatives ... than published figures suggest. The N-NOSE test, sold by Japanese start-up Hirotsu Bio Science, detects the presence of cancer on the basis of whether microscopic nematode worms move towards a urine sample. Hirotsu Bio Science chief technology officer Eric di Luccio suggests that the criticisms are “100% bullshit”. The company has highlighted that the doctors’ figures have not been subject to peer review. Two Japanese medical societies have launched an investigation, with results expected early next year.

https://www.nature.com/articles/d41586-023-03733-9?utm_source=Live+...

--

Why some scientists aren’t using ChatGPT

“Why am I even a researcher if I don’t write my own research?” asks psychologist Ada Kaluzna. She is one of those who have shunned using generative artificial intellige..., because she feels it could disrupt her ability to learn and think creatively. Others are concerned about the tendency of chatbots to make up facts and citations when answering niche questions. Some scientists think that the most cutting-edge AI tools could be useful — especially when writing in a language other than your mother tongue — but are stuck on the waiting list for ChatGPT-4.

https://www.nature.com/articles/d41586-023-04071-6?utm_source=Live+...

Comment by Dr. Krishna Kumari Challa on December 22, 2023 at 11:29am

Baby Survives Incredibly Rare Pregnancy Outside of Mother's Uterus

A 37 year old woman from the French island of Réunion east of Madagascar visited a hospital emergency department, only to discover she was – in fact – pregnant. That was okay.

Scans soon revealed a rather surprising twist. Though there was a 23-week-old baby happily kicking around inside the woman's body, her uterus was completely empty. The fetus had instead set anchor to the membrane lining the abdominal cavity, just above the mother's tailbone.

Identifying the situation as a case of abdominal ectopic pregnancy, the woman's medical care team sent her to a more suitable hospital, where at 29 weeks the baby was delivered surgically and placed into neonatal intensive care. Around 2 months after being delivered, the child was given the all-clear to go home.

Most ectopic pregnancies implant themselves into the lining of one of the two fallopian tubes that channel ova from the ovaries, resulting in a potentially life-threatening situation should the embryo continue to grow. Without suitable medical care, as many as 10 percent of such pregnancies can claim the parent's and child's lives. Yet in less than one percent of ectopic pregnancies, the newly-formed embryo drifts out of the uterus's internal environment altogether and into the abdominal cavity, where it settles against the peritoneal membrane, spleen, or some other tissue or organ, and weaves itself a placenta.

Surprisingly, this arrangement isn't always as disastrous for the embryo as it seems. At least, not at first. Sooner or later, however, the unsupported weight of the growing child and pressure of surrounding organs pose risks to both the child's development and their parent's health.

Maternal death beyond 20 weeks of gestation can occur in as many as nearly one in five cases thanks to shock, hemorrhaging, and multiple organ failure.

For the woman in this case, a timely visit to the emergency department almost certainly saved her life.

https://www.nejm.org/doi/full/10.1056/NEJMicm2120220?

Comment by Dr. Krishna Kumari Challa on December 22, 2023 at 11:10am

She continued to have trouble breathing and developed new problems like difficulty swallowing, weakness on one side, tingling and numbness, and unsteady walking, so the girl was admitted to a pediatric hospital for a thorough evaluation.

Otolaryngologists examined her vocal cords again, and this time they diagnosed bilateral vocal cord paralysis, essentially meaning both her vocal cords were unable to move. But they still couldn't find a cause for the paralysis.

Results from a battery of tests ruled out infections and neurological disorders. Her brain and spine scans showed no obvious issues that could be related to her symptoms, nor did tests on her swallowing.

Based on their findings, doctors concluded that the teenager's previous COVID-19 infection appeared to have weakened her vocal cords, and may also be the cause of her numbness and weakness on one side.

Botulinum toxin injections into her throat muscles – a method that's shown efficacy in treating some throat pathologies in children – was unsuccessful in alleviating her breathing issues.

Eventually the girl had surgery for a tracheostomy, where a small opening is made in the trachea (windpipe) to assist breathing. And finally, her breathing got better.Her weakness, tingling, and numbness improved over time, raising the likelihood that they were related to her past COVID-19 infection.

The medical team tried a few times to see if she could breathe without the tracheostomy, but it wasn't until the 15th month after insertion that they were able to remove it safely.

"She was having her senior prom a year and a quarter to the date of when she lost her function, and she told me she was not going to go to the prom with her tracheostomy in place," says Hartnick.

"We decided to intervene so that she could graduate high school and go to her prom tracheostomy-free, which she did."

https://publications.aap.org/pediatrics/article/doi/10.1542/peds.20...

Part 2

Comment by Dr. Krishna Kumari Challa on December 22, 2023 at 11:10am

Teenager's Vocal Cords Paralyzed After COVID in World First

Days after a SARS-CoV-2 infection, an otherwise healthy teenage girl suddenly had trouble breathing. COVID-19 appeared to have paralyzed her vocal cords.
The girl needed a surgical tracheostomy – an opening in her windpipe below her voice box – to support her breathing for over a year. According to a new case report on the event, COVID's impact on the nervous system may cause vocal cord paralysis in rare cases.
The authors say this is the first case of vocal cord paralysis in a teenager after a COVID-19 diagnosis, though there have been reports of the condition in adults.

The virus has known neurologic complications, including headache, seizure, and peripheral neuropathy.
The current case reveals that vocal cord paralysis may be an additional neuropathic sequela of the virus
Thirteen days after a positive SARS-CoV-2 test, the 15-year-old girl presented to a hospital emergency department. Her initial symptoms including congestion, fever, and fatigue, improved after five days. But she reported having trouble breathing suddenly nine days after the positive test, especially when active.

Emergency department doctors noted her breathing was rapid and noisy when inhaling, indicating obstructed airflow, though her oxygen levels were normal. Tests for SARS-CoV-2 and other respiratory infections were negative.

The patient, who had a history of asthma and anxiety, was given steroids and bronchodilators for a suspected asthma attack, but it didn't help.

Otolaryngologists examined her vocal cords and diagnosed paradoxical vocal fold motion (PVFM), where the vocal cords close instead of opening while a person is breathing in. She began speech therapy to treat this involuntary closure, but her symptoms didn't improve and it became clear they didn't match the typical signs of PVFM.
Part 1

Comment by Dr. Krishna Kumari Challa on December 22, 2023 at 10:31am

New ultra-high speed processor to advance AI, driverless vehicles and more

A team of international scientists has developed an ultra-high speed signal processor that can analyze 400,000 real time video images concurrently, according to a paper published in Communications Engineering.

The team developed a processor that operates more than 10,000 times faster than typical electronic processors that operate in Gigabyte/s, at a record 17 Terabits/s (trillion bits per second).

The technology has profound implications for the safety and efficiency of driverless cars, medical imaging and could help find habitable planets beyond our solar system.

These are portable, ultra-precise optical rulers that could be used for everything from handheld breath scanners to detecting small movements of objects in space or finding Earth-like exoplanets.

The processor's efficiency and speed will have a major impact on artificial intelligence (AI), machine learning and robotic vision. The ability to process vast amounts of data in real-time will lead to more intelligent, autonomous robotic systems that can operate efficiently in real-world environments.

In astronomy, for example, processing large volumes of celestial data at unprecedented speeds will support groundbreaking discoveries. This approach will also accelerate functions of medical imaging and autonomous vehicles.

All real-time analysis and decision-making requires ultrafast analysis of video images for everything from autonomous driving to artificial intelligence in order to detect and analyze objects.

The secret to its remarkable performance lies in the integrated optical microcomb, which overcomes the bandwidth and energy limitations inherent in electronics.

 Mengxi Tan et al, Photonic signal processor based on a Kerr microcomb for real-time video image processing, Communications Engineering (2023). DOI: 10.1038/s44172-023-00135-7

Comment by Dr. Krishna Kumari Challa on December 22, 2023 at 9:58am

The study brings to light the overlooked health hazards posed by pathogens associated with microplastics in aquatic environments. It strongly advocates for immediate and decisive action to protect public health and maintain the integrity of the environment. Additionally, the research underscores the necessity for multidisciplinary research efforts to unravel the intricate interactions between microplastic-associated pathogens and to devise effective strategies for their mitigation.

More information: Huan Zhong et al, The hidden risk of microplastic-associated pathogens in aquatic environments, Eco-Environment & Health (2023). DOI: 10.1016/j.eehl.2023.07.004

Part 2

Comment by Dr. Krishna Kumari Challa on December 22, 2023 at 9:57am

Microplastic-associated pathogens in aquatic environments: A hidden health risk

Microplastics, which are minute plastic particles under 5mm in size, are becoming ever more ubiquitous in marine and freshwater ecosystems around the globe. These particles, derived from primary and secondary sources, such as industrial raw material nurdles and the degradation of larger plastic items, have escalated into a major environmental issue.

In aquatic settings, these microplastics take on the role of carriers for a range of pathogens, encompassing bacteria, viruses, and other microorganisms. This dynamic presents a considerable hazard, with the potential to cause infections in both marine life and humans.

A new study, featured in the journal Eco-Environment & Health, reveals the hidden dangers associated with pathogen-laden microplastics in aquatic environments, underscoring an increasing concern for public health.
The research delves into how microplastics act as conduits for pathogens in various aquatic environments. It thoroughly investigates the factors influencing the adherence of pathogens to microplastics, their survival, and the probability of these pathogens being transmitted to humans via different routes of exposure.

This investigation is instrumental in shaping both public health policies and environmental strategies. It emphasizes the urgent need for intensified monitoring of microplastic contamination and calls for expanded research into the role of microplastics in pathogen transmission, along with the health risks that ensue.

Part 1

Comment by Dr. Krishna Kumari Challa on December 22, 2023 at 9:53am

Highlights
The Cd(II) adsorption capacity followed the order of PA > PLA > PP.
Oxygen groups played critical roles in Cd(II) adsorption by PLA MPs.
Degradation of PLA MPs enhanced Cd(II) desorption in human digestive fluid.
Cd(II) release was easier from PLA during human digestion than from PP or PA.
The study sets a foundation for future research into the long-term impacts of biodegradable microplastics on human health and the environment. It emphasizes the need for more thorough regulations and guidelines to effectively manage the use and disposal of these materials.

 Timing Jiang et al, A potential threat from biodegradable microplastics: mechanism of cadmium adsorption and desorption in the simulated gastrointestinal environment, Frontiers of Environmental Science & Engineering (2023). DOI: 10.1007/s11783-024-1779-4

Part 2

• ‹ Previous
• 1
• …
• 293
• 294
• 295
• 296
• 297
• …
• 1078
• Next ›
• Page