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On GABA function and physiology in the pineal gland.

M M Mata, B K Schrier, D C Klein

    Brain Research
    |December 24, 1976
    PubMed
    Summary

    Pineal gland gamma-aminobutyric acid (GABA) and its synthesis enzyme, glutamic acid decarboxylase (GAD), are not affected by light or nerve input. GABA does not modulate the adrenergic regulation of pineal serotonin N-acetyltransferase (NAT) activity.

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    Evolution of melatonin as a night signal: Contribution from a primitive photosynthetic organism.

    Molecular and cellular neurosciences·2009

    Area of Science:

    • Neuroscience
    • Biochemistry
    • Chronobiology

    Background:

    • The pineal gland plays a crucial role in regulating circadian rhythms and hormone production.
    • Gamma-aminobutyric acid (GABA) is a major inhibitory neurotransmitter, but its function within the pineal gland is not well understood.
    • The adrenergic regulation of pineal serotonin N-acetyltransferase (NAT) activity is a key pathway in melatonin synthesis.

    Purpose of the Study:

    • To investigate the regulation of GABA content and glutamic acid decarboxylase (GAD) activity in the pineal gland.
    • To determine if GABA influences the adrenergic stimulation of pineal serotonin N-acetyltransferase (NAT) activity.
    • To elucidate the role of GABA in pineal gland function.

    Main Methods:

    • Pineal glands were subjected to various experimental conditions including environmental light manipulation, denervation, organ culture, and treatment with specific inhibitors and neurotransmitters.

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  • Glutamic acid decarboxylase (GAD) activity was measured.
  • Serotonin N-acetyltransferase (NAT) activity was assessed following adrenergic stimulation.
  • GABA levels and synthesis were analyzed.

    • Main Results:

    • Pineal GABA content and GAD activity were not influenced by environmental light, catecholamines, sympathetic innervation, or pineal stalk input.
    • GAD activity persisted after pineal stalk section and ganglionectomy, suggesting it is not located in nerve processes.
    • Inhibition of protein synthesis did not significantly affect the slow decrease in GAD activity, indicating slow turnover.
    • GABA, amino-oxyacetic acid (AOAA), or bicuculline did not alter basal or adrenergic-stimulated pineal NAT activity.
    • GABA does not modulate the adrenergic regulation of pineal NAT activity.
    • GABA content and synthesis are not regulated by an adrenergic mechanism.

    Conclusions:

    • GABA and its synthesis enzyme GAD are intrinsic to the pineal gland and not primarily regulated by neural input or light.
    • GABA does not play a modulatory role in the adrenergic pathway controlling pineal NAT activity.
    • The specific function of GABA within the pineal gland remains to be determined.