Pulling Back the Curtain: mRNA Lipid Nanoparticle Design Created Potential for Clotting and Triggering Immune Overdrive

By Dr Frank Yap, M.D. -

Summary of Key Facts:

  • The lipid nanoparticle (LNP) capsule contains the active ingredient messenger RNA (mRNA).
  • The LNP is formed by lipids “teaming up” together to form a ball.
  • LNP molecules offer great potential as a delivery vehicle, however, the design of the LNP can cause harm.
  • The LNP capsule can cluster with other LNPs or fall apart after injection, potentially causing clotting.
  • If the LNP capsule falls apart, loose strands of mRNA can circulate in the blood.
  • Because the mRNA is negatively charged, loose mRNA in the blood can cause clotting if it clusters with positively charged molecules.
  • The LNP capsule lipids also have properties that may cause clotting or trigger the immune system to overreact.
  • Researchers knew about these possibilities before the vaccines were authorized.
  • The regulatory agencies knew about the possibility of harmful effects before they were even injected into the body.
  • The possibility of multiple boosters causing harm was also known before authorization.
  • As time passes, we are learning more about the possible mechanisms behind these adverse events.

The Food and Drug Administration (FDA) and European Medicines Agency (EMA) authorized a novel vaccine product based on laboratory studies and animal models, then applied these findings to humans. In addition, most of the mRNA research prior to the pandemic used intravenous (IV) injection directly into the bloodstream, not intramuscular (IM), as vaccines are typically delivered.

Various design challenges had to be overcome to create a vaccine built on a repurposed cancer-fighting platform, but some of these useful features of the LNP may be the flaws potentially contributing to adverse events.

LNP Design Features

The LNP is a capsule comprised of four different lipids carrying the mRNA inside.

Imagine a drop of oil descending into a glass of water. The oil does not disperse in the water—it stays together. This is how the LNPs stay together to carry the mRNA to a cell membrane where it can be absorbed.

Certain features of the lipids cause them to organize into the LNP capsule shape. The tail of the lipid is hydrophobic, meaning it does not mix with water because it has a neutral charge. The head of the lipid is a phosphate that has an electrical charge, making it hydrophilic. These features cause them to organize themselves.

The lipids gather together—tails pointing in and heads pointing out—creating a ball, as pictured below. When the polyethylene glycol (PEG) adheres to a lipid, the PEG-lipid helps to stabilize the molecule, encouraging it to form smaller LNPs and preventing it from adhering to proteins in the blood.

In the center of the LNP is the RNA, which has a negative charge. When you add up the negative charge of the RNA and the positive charge of the phosphate heads on the lipids, the LNP net charge is mostly neutral, if not slightly negative.

Lipid nanoparticle mRNA vaccine, a type of vaccine used against COVID-19 and influenza. 3D illustration showing cross-section of a lipid nanoparticle carrying mRNA of the virus (orange).(Kateryna Kon/Shutterstock)

The PEG-lipids help keep the LNP from breaking apart. Once inside the cell, however, the LNP needs to split open to release the mRNA cargo. The cone-shaped configuration of the LNP can help this process.

The amount of PEG-lipids can affect particle size and zeta potential. Zeta potential is the electrical charge that develops around the surface of a particle. The zeta potential is important because it determines whether the LNPs tend to disperse or clump together. A high zeta potential—positive or negative—helps the nanoparticles disperse and float freely.

In addition, certain other PEG modifications affect how fast the kidneys and immune system clear the LNPs. If it takes a long time to clear the LNPs, they can circulate longer in the blood and create the potential for adverse events.

LNP Design Dilemmas: Stability Versus Fragility

The LNP design dilemma had serious implications: whether to create a stable LNP capsule that does not fall apart readily or a more fragile capsule that breaks down quickly. This design challenge affects how the capsule behaves in the body.

A highly stable capsule is useful for mRNA gene therapy, which is how this technology was originally developed. For gene therapy, the mRNA needs to be stable enough to reach its intended target and either produce a missing protein or turn off a harmful gene.

For vaccination, however, the opposite effect is desired: the LNP needs to be less stable so it will dissolve quickly at the injection site and release the fragile mRNA immediately. Otherwise, it will allow the LNP to travel throughout the human body to an unintended organ or tissue.

The biodistribution studies covered in Parts 1 and 2 tell us that the LNP mRNA design failed this “dual mission impossible.” Dispersion to distant organs peaked within about 48 hours. The effect of expressing spike protein on cells in these organs in humans is unknown, so simply adopting LNPs designed for gene therapy for direct usage in mRNA vaccine delivery will likely prove to be a significant mistake.

LNP Design Features Affect Clotting

In addition to the challenge of creating a stable LNP that breaks down quickly at the injection site, the LNP design may also cause clustering leading to clotting. If the LNP falls apart, the charges on the lipids and the loose mRNA may promote interactions with other substances in the blood.

These two factors may explain the potential for “thromboembolic” events. Thrombotic events involve the formation of a clot (thrombosis) in the bloodstream. Formation of the clot itself or its movement to another site (embolism) may block the flow of blood.

LNPs Can Cluster and Cause Clotting 

When the LNPs diffuse into the blood system, the tiny particles can increase in size based on the Ostwald ripening phenomenon. This is a process in which small crystals dissolve in solution and then redeposit, forming larger clusters.

The diameter of arterioles, small blood vessels connecting arteries and capillaries, varies from 8000 to 60,000 nanometers (nm). A typical COVID-19 mRNA vaccine LNP is 60 to 200 nm. If the size of the clustered mRNA LNP particles increases to 5000 nm and above, LNPs could block blood vessels and cut off blood flow.

When thromboses occur within blood vessels, blood flow to critical organs can be obstructed. This includes the heart, lungs, kidneys, intestines, and even the brain.

For example, an autopsy review of 25 unexpected deaths that occurred within 20 days of COVID-19 vaccination found eight cases of thrombotic events, including five with “myocardial infarction,” two with “pulmonary embolism,” and one with “deep vein thrombosis.” (pdf)

Have human studies been conducted to assess the degree to which the LNPs cluster? To our knowledge, nothing has been published.

The LNP Can Fall Apart 

If the LNP falls apart, two components, the capsule and the mRNA cargo, may cause interactions that promote clotting due to the electrical charge on each component.

The charge controls where the particles travel in the body. For instance, a positively charged LNP capsule can target the lung; a negatively charged LNP can target the spleen; while an LNP with an intermediate charge (such as mRNA COVID-19 vaccines) has a greater tendency to travel to the liver, as was seen in the preclinical biodistribution studies.

The potential for negatively charged free mRNA to cause problems was also seen with the adenovirus vector vaccines made by Astra-Zeneca and Johnson & Johnson, which caused blood clots in some people with a genetic predisposition.

Similarly, if the negatively charged mRNA slips out of the LNP carrier, it could theoretically lead to clotting due to its negative charge.

Could the challenges of maintaining a strict “cold chain” (freezing temperature required for vaccine stabilization from manufacturing to injection) have introduced the potential for LNPs to fall apart prior to injection?

“When the LNPs are frozen and thawed,” according to biotechnology consultant Christie Grace, “the [mRNA] can slip out, charges can start interacting with the human body and [potentially] cause clots.”

Dr. Ko, a South Korean professor of pharmacy who has written dozens of articles on LNPs, agrees that the molecules can break down and separate if pH and temperature are not carefully controlled.

What happens if the LNPs disintegrate in the vial before injection? What testing has been done to evaluate exposed mRNA (not lipid nanoparticle encapsulated mRNA) interactions in the blood?

LNP Engineering Can Alter Clotting

Nanoparticle interactions can be helpful or harmful. For example, nanoparticles can be engineered to help the blood to clot, which is useful for those with clotting disorders. On the other hand, if LNP interactions with other substances in the blood cause clotting, this is harmful.

What was known about the potential of LNPs to affect clotting before the pandemic?

In 2020, Faizullin, et al. reported: “We observed pronounced changes in both clot morphology and kinetics of fibrin clotting in the presence of artificial liposomes.” In other words, previous research on LNPs noted that clots looked different and fibrin behaved differently with LNPs.

Fibrin is a part of the human body’s natural clotting cascade. Binding to fibrin accelerates the normal clotting process. Faster fibrin clotting has been observed in laboratory studies using blood from patients with COVID-19. This clotting tendency may be due to the presence of the spike protein’s S1 subunit. Thus, the LNP mRNA vaccine may promote clotting either due to the design of the LNP, the presence of the spike protein’s S1 subunit, or both.

‘Immune Overdrive’

Finally, the mRNA was engineered to help it sneak past our natural immune defenses. This clever design feature may have a fatal flaw.

Our immune system looks for special patterns to detect invading microbes. One of these patterns is foreign RNA. To avoid being detected before the vaccine has a chance to work, one part of the COVID-19 vaccine mRNA—uridine—was replaced with pseudouridine.

However, if the immune system never notices, then we do not get the intended benefit. Adjuvants, such as aluminum, are added to vaccines for this reason—to wake up the immune system. Once stimulated, the immune system ramps up its production of antibodies and memory T cells.

The lipids used to create the LNP capsule may also stimulate the immune system via the same pattern detectors used to find harmful invaders. Although this may make them an effective adjuvant for the vaccine, mouse models suggest that LNPs may put the immune system into “overdrive.”

The EMA noted in its report that the innate immune system ramps up immediately after injection, peaks at six hours, then returns to baseline nine days later. An article in Cell also discussed the innate immune system in the context of vaccine adverse events (AEs). The authors noted that “frequent booster immunizations may increase the frequency and/or the severity of the reported AEs.”

What Was Known Prior to Authorization?

Early research on LNPs suggests the following issues were well-documented before the COVID-19 vaccines were authorized:

1) Off-target travel throughout the body is determined by the charge of the LNP.

2) The innate immune system is triggered by LNPs that could run the risk of causing an over-reaction.

3) The cationic (negatively charged) lipid particles are linked to immune stimulation.

4) The mode of delivery matters (via muscle or bloodstream), affecting where the LNPs travel.

5) The LNPs were specifically designed for the uptake by the lymphatic system, as discussed in a previous Epoch Times article.

These effects were known prior to FDA authorization and strongly suggest that more testing should have been done in humans.

Carrasco et al. appears to agree with our concerns about the need to better understand biodistribution in humans. They noted that “A specific and important application of these new insights is in the reduction of systemic distribution and off-target expression after IM vaccine delivery.”

Knowledge about charged particle trafficking throughout the body is limited and primarily based on intravenous (IV) injections; only one study published prior to the pandemic explored how an intramuscular injection would affect LNP dispersion.

A 2021 Nature article sums up the importance of careful design. They note, as did the EMA, that negatively charged LNPs concentrate in the liver following injection. “This undesirable systemic off-target expression of mRNA-LNP vaccines could be minimized through appropriate design of the ionizable lipid and LNP.”

Pulling back the curtain on the LNP design, we see that several features intended for stealth delivery of mRNA to the cell have set the stage for a wide range of adverse events which should have been anticipated through testing, and prevented through cautious policy.

This article is part of the Vaccine series.

Related: 

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About the Authors:

Allison Krug is an epidemiologist and program manager with experience leading population health programs. She's the lead author of the first stratified risk-benefit analysis of mRNA vaccination among adolescents and editor for 400+ research manuscripts published in high impact factor, peer-reviewed journals. She's also the founder and CEO of Artemis Biomedical Communications, LLC.

Dr. Duriseti is a clinical associate professor and physician-scientist at Stanford University. He received his M.D. from the University of Michigan and his medical training and Ph.D. in Computational Decision Modeling from Stanford University. He has practiced in clinical Emergency Medicine in both community and academic settings for over 22 years.

Reposted from: https://www.theepochtimes.com/health/pulling-back-the-curtain-mrna-lipid-nanoparticle-design-created-potential-for-clotting-and-triggering-immune-overdrive_5201297.html

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By Dr Frank Yap, M.D. -
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Well-respected North Texas cardiologist, Dr. Peter McCullough has impeccable academic credentials. He's an internist, cardiologist, epidemiologist, a full professor of medicine at Texas A&M College of Medicine in Dallas. He also has a master's degree in public health and is known for being one of the top five most-published medical researchers in the United States and is the editor of two medical journals. McCullough et al. Reviews in Cardiovascular Medicine, 2020 McCullough Protocol 2022 Updates:  How to Detox Spike Protein from Body  (November 2023) Use of hydroxychloroquine in multidrug protocols for SARS-CoV-2 (October 2024) Paxlovid for Vaccinated or Unvaccinated Adult Outpatients with ...
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Front Line Doctors Ivermectin Protocol for Prevention and Treatment of COVID-19 (2024)

By Dr Frank Yap, M.D. -
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The Front Line COVID-19 Critical Care (FLCCC) Alliance was initially formed as a working group during the early COVID-19 pandemic days in response to multiple early reports of COVID patients with an inexplicably high need for prolonged mechanical ventilation and an excessive death rate.  Based on rapidly emerging clinical trials evidence, the FLCCC team has developed the   I-MASK+ protocol   ( is now divided into I-Prevent and I-Care protocols ) for prophylaxis and at home treatment of early stage COVID-19. Quercetin, zinc and a number of nutrients and drugs are part of this protocol, not only for critical care but also for prophylaxis and mild disease being treated at home. This article, we will dive deeper to provide the scientific background, related references and rationale of the FLCCC protocols. FLCCC ( Front Line COVID-19 Critical Care)  Protocols I-MASK+ Prevention & Early Outpatient Treatment Protocol for COVID-19 was designed for use as a prevention and...
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Quercetin and Zinc: Zelenko Treatment Protocol

By Dr Frank Yap, M.D. -
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As of July 2024, more than 35 studies on the topic of zinc and COVID-19  ( c19zinc.com )  (constantly updated) and more than 10 studies on quercetin and COVID-19 have been published  ( c19quercetin.com ).  Dr. Zelenko’s main hypothesis based on the data showing that early intervention and treatment of high-risk patients with COVID-19 results in significantly few hospitalizations and deaths. This treatment regimen involving zinc, low-dose hydroxychloroquine, and azithromycin (published in the International Journal of Antimicrobial Agents ) is also apparently known as, “The Zelenko Protocol.” Quercetin and Zinc The Zelenko Covid-19 Protocols was developed by Dr Vladimir Zelenko. The protocol has as its centerpiece, but not exclusive piece, the combined use of  Hydroxychloroquine  (HCQ) and Zinc as a means by which a person can both help to prevent or mitigate the contraction of COVID-19, or can actually treat the disease once it has been diagno...
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Dr Peter McCullough: Fact Check and Debunked Theories

By Dr Frank Yap, M.D. -
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Biography Well-respected North Texas cardiologist, Dr. Peter McCullough has impeccable academic credentials. He's an internist, cardiologist, epidemiologist, a full professor of medicine at Texas A&M College of Medicine in Dallas. He also has a master's degree in public health and is known for being one of the top five most-published medical researchers in the United States and is the editor of two medical journals. Personal History Dr. Peter A. McCullough was born in Buffalo, New York, on the 29th of December 1962. During high school, he and his family moved to Wichita Falls in Texas and later settled in Grapevine. He has lived and worked in various parts of the United States, including Washington and Michigan, and he now resides in Dallas, Texas. McCullough Protocol 2022 Dr Peter McCullough Early Treatment Protocol ...
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FLCCC I-CARE COVID Treatment Protocol for Outpatients (2024)

By Dr Frank Yap, M.D. -
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Early treatment is critical and the most important factor in managing this disease. COVID-19 is a clinical diagnosis; a confirmed antigen or PCR test is not required. Treatment should be initiated immediately after the onset of flu-like symptoms. The multiple therapies and drugs in this protocol have different mechanisms of action and work synergistically during various phases of the disease. About I-CARE Protocol The information in this document is our recommended approach to COVID-19 based on the best (and most recent) literature. It is provided as guidance to healthcare providers worldwide on the early treatment of COVID-19. Patients should always consult with their provider before starting any medical treatment. New medications may be added and/or changes made to doses of existing medications as further evidence emerges. Please be sure you are using the latest version of this protocol. Warning (anesthesia and surgery): Please notify your anesthesia team if you are using the followi...
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