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. 1987 Apr;84(7):2078–2081. doi: 10.1073/pnas.84.7.2078

Specific binding of atrial natriuretic factor in brain microvessels.

P E Chabrier, P Roubert, P Braquet
PMCID: PMC304588  PMID: 2882516

Abstract

Cerebral capillaries constitute the blood-brain barrier. Studies of specific receptors (neurotransmitters or hormones) located on this structure can be performed by means of radioligand-binding techniques on isolated brain microvessels. We examined on pure bovine cerebral microvessel preparations the binding of atrial natriuretic factor (ANF), using 125I-labeled ANF. Saturation and competition experiments demonstrated the presence of a single class of ANF-binding sites with high affinity (dissociation constant, approximately 10(-10) M) and with a binding capacity of 58 fmol/mg of protein. The binding of 125I-labeled ANF to brain microvessels is specific, reversible, and time dependent, as is shown by association-dissociation experiments. The demonstration of specific ANF-binding sites on brain microvessels supposes a physiological role of ANF on brain microvasculature. The coexistence of ANF and angiotensin II receptors on this cerebrovascular tissue suggests that the two circulating peptides may act as mutual antagonists in the regulation of brain microcirculation and/or blood-brain barrier function.

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Selected References

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