Cited by 678RNA Interference and Gene DeliveryImmunotherapy and Immune ResponsesSARS-CoV-2 and COVID-19 Research

The mRNA-LNP platform's lipid nanoparticle component used in preclinical vaccine studies is highly inflammatory

Open access
Ndeupen, Sonia, Qin, Zhen, Jacobsen, Sonya, Bouteau, Aurélie, Estanbouli, Henri, Igyártó, Botond Z.·2021·iScience

Published version of a preprint

Abstract

Vaccines based on mRNA-containing lipid nanoparticles (LNPs) are a promising new platform used by two leading vaccines against COVID-19. Clinical trials and ongoing vaccinations present with varying degrees of protection levels and side effects. However, the drivers of the reported side effects remain poorly defined. Here we present evidence that Acuitas' LNPs used in preclinical nucleoside-modified mRNA vaccine studies are highly inflammatory in mice. Intradermal and intramuscular injection of these LNPs led to rapid and robust inflammatory responses, characterized by massive neutrophil infiltration, activation of diverse inflammatory pathways, and production of various inflammatory cytokines and chemokines. The same dose of LNP delivered intranasally led to similar inflammatory responses in the lung and resulted in a high mortality rate, with mechanism unresolved. Thus, the mRNA-LNP platforms' potency in supporting the induction of adaptive immune responses and the observed side effects may stem from the LNPs' highly inflammatory nature.

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Integrity signals

Registry

Crossref · 10.1016/j.isci.2021.103479

Cites

82 of 82 references verified0 citation errors · 0 not checkable

Statistics

Claims the paper makes

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • saRNA can address shortcomings of mRNA by decreasing the number of doses and administration frequency, mitigating side effects and bolstering manufacturing capacity.

    “saRNA can address the shortcomings of mRNA by decreasing the number of doses and the administration frequency, which will mitigate side effects8–10 and bolster manufacturing capacity”

    From Complete substitution with modified nucleotides in self-amplifying RNA suppresses the interferon response and increases potency (2025) · cites this paper as [9]

    The Discussion (page unavailable) says side effects after a second mRNA-LNP vaccination could be further exacerbated, which lends some support to the idea that fewer administrations might reduce side effects. It does not discuss saRNA or establish that saRNA requires fewer doses or mitigates side effects; the manufacturing-capacity claim is also unsupported by this source. (LLM, conf=0.78)

    Experimental — accuracy not yet measured

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

The self-check needs the paper’s full text.

Cites

Flagged first, then by citations

Research works printed but not linked: 3

  1. Comirnaty Assessment Report COVID-19 Vaccine Comirnaty. EMA/707383/2020 Corr.1∗ 31 2021 1 140 https://www.ema.europa.eu/en/documents/assessment-report/comirnaty-epar-public-assessment-report_en.pdf
  2. Moderna Assessment Report COVID-19 Vaccine Moderna Common. EMA/15689/2021 Corr.1∗1 31 2021 1 169 https://www.ema.europa.eu/en/documents/assessment-report/spikevax-previously-covid-19-vaccine-moderna-epar-public-assessment-report_en.pdf
  3. Walsh E.E. Frenck R.W. Falsey A.R. Kitchin N. Absalon J. Gurtman A. Lockhart S. Neuzil K. Mulligan M.J. Bailey R. Safety and immunogenicity of two RNA-based covid-19 vaccine candidates N. Engl. J. Med. 383 2020 2439 2450 33053279 PMC7583697

Cited by

Sorted by citations

Authors
Ndeupen, S., Qin, Z., Jacobsen, S., Bouteau, A., Estanbouli, H., & Igyártó, B. Z.
Affiliations
Thomas Jefferson University (US)
Corresponding author
Igyártó, Botond Z.
Venue
iScience
Publisher
Elsevier BV
Published
2021-12
Volume
24
Issue
12
Pages
103479
ISSN
2589-0042 (ISSN-L)
OpenAlex
W3217355073
Cited by
678
References
82
Citations by year
2026: 145 · 2025: 172 · 2024: 137 · 2023: 114 · 2022: 90 · 2021: 20
FWCI
28.18
Type
journal article
Language
en
Open access
Locations
  • iScience (publishedVersion, cc-by-nc-nd)
  • PubMed Central (publishedVersion, cc-by-nc-nd)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
NIAID
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA Interference and Gene Delivery
  • Life Sciences › Immunology and Microbiology › Immunology › Immunotherapy and Immune Responses
  • Health Sciences › Medicine › Infectious Diseases › SARS-CoV-2 and COVID-19 Research
Keywords
mRNA-LNP vaccine, lipid nanoparticles, vaccine adjuvants, inflammation, vaccine side effects, neutrophil infiltration, inflammatory cytokines, chemokines, intranasal drug delivery, lung inflammation, mRNA vaccines, COVID-19 vaccines, nucleoside-modified mRNA

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review