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Pipecolic acid levels and transport in developing mouse brain.

J S Kim, E Giacobini

    Brain Research
    |October 1, 1985
    PubMed
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    Newborn mouse brains show significant regional differences in pipecolic acid (PA) levels, mirroring accumulation patterns after D,L-PA injections. PA levels are highest perinatally and decrease rapidly postnatally.

    Area of Science:

    • Neuroscience
    • Developmental Biology
    • Analytical Chemistry

    Background:

    • Pipecolic acid (PA) is a molecule with largely unknown functions in the brain.
    • Understanding PA's distribution and developmental changes is crucial for neurological research.

    Purpose of the Study:

    • To investigate the regional distribution of pipecolic acid (PA) in the newborn mouse brain.
    • To characterize the developmental changes in PA levels in the brain, serum, liver, and kidney.
    • To compare PA accumulation in the brain after administration in newborn versus adult mice.

    Main Methods:

    • A sensitive high-performance liquid chromatography with electrochemical detection (HPLC-EC) method was developed and utilized.
    • Regional brain PA levels were measured in newborn mice.

    Related Experiment Videos

  • PA levels in serum, liver, and kidney were assessed across different developmental stages.
  • Pharmacokinetic studies of D,L-PA accumulation were performed in newborn and adult mice after injection.

    • Main Results:

    • Significant regional variations in newborn mouse brain PA levels were observed, with highest concentrations in the diencephalon, olfactory bulb, and anterior telencephalon.
    • PA levels were highest in brain and serum during the perinatal period, decreasing to adult levels within two weeks.
    • The brain/serum PA ratio decreased from 2.9-3.5 perinatally to 0.7-0.8 by 30 days.
    • Liver and kidney showed similar perinatal elevations, rapidly declining to adult levels within one week.
    • In newborns, D,L-PA brain accumulation persisted for up to 24 hours, whereas in adults, peak concentrations were reached within 5-10 minutes.

    Conclusions:

    • The regional distribution of endogenous PA in the newborn brain correlates with its exogenous accumulation patterns.
    • Pipecolic acid levels undergo significant developmental regulation in the brain, serum, liver, and kidney.
    • Distinct pharmacokinetic profiles for PA exist between newborn and adult mice, suggesting developmental differences in uptake or metabolism.