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Study · Measured the body's own peptide · 1991

1 result

Concentration of substance P, neurokinin A, calcitonin gene-related peptide, neuropeptide Y and vasoactive intestinal polypeptide in synovial fluid from knee joints in patients suffering from rheumatoid arthritis.

Larsson J, Ekblom A, Henriksson K, Lundeberg T, Theodorsson E

Scandinavian journal of rheumatology1 Jan 1991Cited by 97 (Europe PMC)

PMID1947895 (opens in a new tab)DOI10.3109/03009749109096808 (opens in a new tab)PepBankPUB-01947895
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Summary

The text of this summary is not shown here, because the article license does not allow reuse. Read it at the source (opens in a new tab)

Text rights: Publisher copyright. Results still quote short attributed sentences.

Results from this study1

No result from this study comes from a test of the peptide.

Natural levels measured1

These results measure the body's own peptide. Nobody was given the peptide. They are not evidence about taking it. They are left out of key results, evidence counts and charts.

  1. 01HumanEndogenous levelObservational studyOther

    VIP was found only sporadically in knee synovial fluid, in both patients with rheumatoid arthritis and controls.

    In plain wordsIn knee fluid, the body's own VIP was found only rarely in both people with rheumatoid arthritis and controls.

    Peptide
    Vasoactive intestinal peptide (VIP, aviptadil)
    Outcome
    Not applicableVIP in knee synovial fluid
    Study

    n = 31

    Comparator
    Patients undergoing arthroscopy for meniscal/cruciate ligament injuries
    Outcome group
    Inflammation markers · Musculoskeletal

    Source sentences

    Summary
    VIP was found sporadically in both arthritis and control patients.
    1 context sentence
    Summary · context
    We have studied the presence of five neuropeptides in knee joint synovial fluid from either patients suffering from rheumatoid arthritis and pain (n = 18) or being subjected to arthroscopy due to meniscal/cruciate ligament injuries (n = 13).

    This result measures the body's own Vasoactive intestinal peptide (VIP, aviptadil). Nobody was given the peptide. It is not evidence about taking it.

AI wrote and checked these results. AI can make mistakes, so check important results against the source.

Version history

PepBank keeps every version of the data on this study. Status changes from Retraction Watch, Europe PMC and Crossref are listed with their source.

  1. Version 2Current

    12 Oct 2026, 12:58 UTC

    Study results updated

  2. Version 1

    9 Oct 2026, 12:41 UTC

    First added · source update from Europe PMC

Subjects

Terms as the source lists them.

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