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GT says that ANP exerts negative-feedback on the renin-angiotensin system.
To my understanding, a negative-feedback loop implies the inhibition of production/secretion of a moiety via the downstream effects of that moiety itself.
In other words, I would think that negative-feedback refers to the decreased production of a molecule not due to a moiety external to the production-cascade of that molecule.
With prolactin negative-feedback, for instance, increased prolactin leads to increased dopamine production, which in turn inhibits prolactin. There's no "external" molecule regulating that intrinsic loop, and in turn prolactin exerts negative-feedback on its own production.
With respect to ANP, however, I would think it's considered external to the renin-angiotensin loop because it's not actually produced in order to carry out the effects of that loop. So if ANP reduces activity of the renin-AT loop, that's not actually negative-feedback.
Any thoughts here / food for discussion?
Cheers,
To my understanding, a negative-feedback loop implies the inhibition of production/secretion of a moiety via the downstream effects of that moiety itself.
In other words, I would think that negative-feedback refers to the decreased production of a molecule not due to a moiety external to the production-cascade of that molecule.
With prolactin negative-feedback, for instance, increased prolactin leads to increased dopamine production, which in turn inhibits prolactin. There's no "external" molecule regulating that intrinsic loop, and in turn prolactin exerts negative-feedback on its own production.
With respect to ANP, however, I would think it's considered external to the renin-angiotensin loop because it's not actually produced in order to carry out the effects of that loop. So if ANP reduces activity of the renin-AT loop, that's not actually negative-feedback.
Any thoughts here / food for discussion?
Cheers,