Evidence map›Paper›PMID 19633820›Full record

ArticlePharmaceutical research2009

Accelerated blood clearance phenomenon upon repeated injection of PEG-modified PLA-nanoparticles.

Tsutomu Ishihara, Miho Takeda, Haruka Sakamoto, Ayumi Kimoto, Chisa Kobayashi, Naoko Takasaki, Kanae Yuki, Ken-ichiro Tanaka, Mitsuko Takenaga, Rie Igarashi and 8 more

Abstract readComparative Study
PubMed Publisher
In one paragraph

Article in Pharmaceutical research, 2009. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 63 papers.

0numbers the graph read from it
0cells of the map it votes in
63citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

63 citing papers in PubMed.

  1. Trial
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  13. Biomimetic Exosomes: A New Generation of Drug Delivery System.Frontiers in bioengineering and biotechnology · 2022
    Review
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3 more citing papers are in PubMed but not listed here.

4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

18 authors.

Tsutomu IshiharaGraduate School of Medical and Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-honmachi, Kumamoto, 862-0973, Japan.
Miho Takeda
Haruka Sakamoto
Ayumi Kimoto
Chisa Kobayashi
Naoko Takasaki
Kanae Yuki
Ken-ichiro Tanaka
Mitsuko Takenaga
Rie Igarashi
Taishi Maeda
Naoki Yamakawa
Yoshinari Okamoto
Masami Otsuka
Tatsuhiro Ishida
Hiroshi Kiwada
Yutaka Mizushima
Tohru Mizushima

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

purposeWe recently developed prostaglandin E(1) (PGE(1))-encapsulated nanoparticles, prepared with a poly(lactide) homopolymer (PLA, Mw = 17,500) and monomethoxy poly(ethyleneglycol)-PLA block copolymer (PEG-PLA) (NP-L20). In this study, we tested whether the accelerated blood clearance (ABC) phenomenon is observed with NP-L20 and other PEG-modified PLA-nanoparticles in rats.

methodsThe plasma levels of PGE(1) and anti-PEG IgM antibody were determined by EIA and ELISA, respectively.

resultsSecond injections of NP-L20 were cleared much more rapidly from the circulation than first injections, showing that the ABC phenomenon was induced. This ABC phenomenon, and the accompanying induction of anti-PEG IgM antibody production, was optimal at a time interval of 7 days between the first and second injections. Compared to NP-L20, NP-L33s that were prepared with PLA (Mw = 28,100) and have a smaller particle size induced production of anti-PEG IgM antibody to a lesser extent. NP-L20 but not NP-L33s gave rise to the ABC phenomenon with a time interval of 14 days. NP-L33s showed a better sustained-release profile of PGE(1) than NP-L20.

conclusionsThis study revealed that the ABC phenomenon is induced by PEG-modified PLA-nanoparticles. We consider that NP-L33s may be useful clinically for the sustained-release and targeted delivery of PGE(1).

Indexed as

AnimalsBlood Circulation TimeMetabolic Clearance RateNanoparticlesParticle SizePolyethylene GlycolsRatsRats, WistarTime Factorsmonomethoxypolyethyleneglycol-polylactide block copolymerPolyethylene Glycols

Identifiers

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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.