Skip to content

Study · Measured the body's own peptide · 2004

3 results

Oxytocin levels in the plasma and cerebrospinal fluid of male rats: effects of circadian phase, light and stress.

Devarajan K, Rusak B

Neuroscience letters1 Sept 2004Cited by 39 (Europe PMC)

PMID15331139 (opens in a new tab)DOI10.1016/j.neulet.2004.05.112 (opens in a new tab)PepBankPUB-15331139
Publisher pagePubMedAsk about this study
Jump to 3 results

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 study3

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

Natural levels measured3

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. 01AnimalEndogenous levelAnimal study (in vivo)Other

    In male rats, an apparent day-night difference in plasma oxytocin levels was eliminated by prior habituation to handling and injections.

    In plain wordsIn male rats, the body's own oxytocin in blood did not differ between day and night after the rats got used to handling.

    Peptide
    Oxytocin
    Outcome
    No significant changePlasma oxytocin day-night difference after habituation
    Study

    Ratn: not reported in source

    Male rats
    Outcome group
    Endogenous peptide levels · Endocrine and hormones

    Source sentences

    Summary
    We found that an apparent day-night difference in plasma oxytocin levels was eliminated by prior habituation to handling and injections.
    1 context sentence
    Summary · context
    We examined oxytocin levels in plasma and CSF of rats at two daily phases in darkness (mid subjective day and late subjective night) and after a 30 min exposure to light.

    This result measures the body's own Oxytocin. Nobody was given the peptide. It is not evidence about taking it.

  2. 02AnimalEndogenous levelAnimal study (in vivo)Other

    In male rats, oxytocin levels in cerebrospinal fluid were regulated by circadian phase.

    In plain wordsIn male rats, the body's own oxytocin in spinal fluid changed with the time of day.

    Peptide
    Oxytocin
    Outcome
    Direction not reportedCSF oxytocin by circadian phase
    Study

    Ratn: not reported in source

    Male rats
    Outcome group
    Endogenous peptide levels · Endocrine and hormones

    Source sentences

    Summary
    oxytocin levels in the CSF of rats are regulated by circadian phase
    1 context sentence
    Summary · context
    We examined oxytocin levels in plasma and CSF of rats at two daily phases in darkness (mid subjective day and late subjective night) and after a 30 min exposure to light.

    This result measures the body's own Oxytocin. Nobody was given the peptide. It is not evidence about taking it.

  3. 03AnimalEndogenous levelAnimal study (in vivo)Other

    In male rats, oxytocin levels in cerebrospinal fluid were regulated by prior exposure to light.

    In plain wordsIn male rats, the body's own oxytocin in spinal fluid changed after the rats saw light.

    Peptide
    Oxytocin
    Outcome
    Direction not reportedCSF oxytocin after prior light exposure
    Study

    Ratn: not reported in source

    Male rats
    Outcome group
    Endogenous peptide levels · Endocrine and hormones

    Source sentences

    Summary
    oxytocin levels in the CSF of rats are regulated by circadian phase and by prior exposure to light
    1 context sentence
    Summary · context
    We examined oxytocin levels in plasma and CSF of rats at two daily phases in darkness (mid subjective day and late subjective night) and after a 30 min exposure to light.

    This result measures the body's own Oxytocin. 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

    11 Oct 2026, 20:03 UTC

    Study results updated

  2. Version 1

    9 Oct 2026, 02:50 UTC

    First added · source update from Europe PMC

Subjects

Terms as the source lists them.

PepBank is a research reference. Talk to a doctor before you use any peptide.