PHF: The New Parathyroid Hypertensive Factor - PubMed

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Abstract

Parathyroid Hypertensive Factor (PHF) was discovered in SHR rats as a circulating substance with a unique delayed (60-90 min) hypertensive effect when injected into a normotensive assay rat. Subsequently, this correlation with hypertension was established in humans, especially in low-renin, salt-sensitive patients. Animal model studies also confirmed this correlation. Endocrinectomy and glandular replacement studies suggested that the parathyroid gland was the source of PHF. Subsequently, glands and cells in culture were also shown to secrete the substance. Other studies verified the parathyroid origin of PHF. The mechanism of action of PHF was shown to rely mainly on the opening of L-type calcium channels in vascular smooth muscle cells with an increase in [Ca2++]i. It is known that diseases other than hypertension often show increased [Ca2++]i and clinical features similar to hypertension, among them Type II diabetes. A recent study shows a correlation between circulating PHF level and Type II diabetes irrespective of the blood pressure status of the patient. It is suggested that PHF may be a [Ca++]i modulator, an excessive amount of which in the circulation may act on various target tissues, resulting in various disease symptoms with hypertension as an example. There may be many other such PHF-related diseases yet to be identified.

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• The parathyroid hypertensive factor--facts and future. Hansson L, Hedner T, Jern S. Hansson L, et al. Blood Press. 1994 May;3(3):147. doi: 10.3109/08037059409102244. Blood Press. 1994. PMID: 8069401 No abstract available.

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