Effects of capsaicin and isoflavone on blood pressure and serum levels of insulin-like growth factor-I in normotensive and hypertensive volunteers with alopecia

• Published in: Bioscience, biotechnology, and biochemistry biotechnology, and biochemistry, 2009-06, Vol.73 (6), p.1456-1459
• Main Authors: Harada, N.(Nagoya City Univ. (Japan)), Okajima, K
• Format: Article
• Language: English
• Subjects: ADMINISTRACION ORAL; ADMINISTRATION ORALE; Alopecia - blood; Alopecia - complications; Biological and medical sciences; BLOOD PRESSURE; Blood Pressure - drug effects; BLOOD SERUM; CAPSAICIN; Capsaicin - pharmacology; CAPSAICINA; CAPSAICINE; Case-Control Studies; ENFERMEDADES DE LA PIEL; FACTEUR DE CROISSANCE; FACTORES DE CRECIMIENTO; FLAVONOIDE; FLAVONOIDES; FLAVONOIDS; Fundamental and applied biological sciences. Psychology; GENERO HUMANO; GENRE HUMAIN; GROWTH FACTORS; HIPERTENSION; Humans; HYPERTENSION; Hypertension - blood; Hypertension - complications; INSULIN; Insulin-Like Growth Factor I - metabolism; insulin-like growth factor-I; INSULINA; INSULINE; isoflavone; Isoflavones - pharmacology; MALADIE DE LA PEAU; MANKIND; ORAL ADMINISTRATION; PRESION SANGUINEA; PRESSION SANGUINE; sensory neurons; SERUM SANGUIN; SKIN DISEASES; SUERO SANGUINEO
• ISSN: 0916-8451; 1347-6947
• DOI: 10.1271/bbb.80883

Insulin-like growth factor-I (IGF-I) reduces arterial blood pressure. Since administration of capsaicin and isoflavone increases serum levels of IGF-I by sensory neuron stimulation in subjects with alopecia, it is possible that administration of capsaicin and isoflavone reduces arterial blood pressure in patients with hypertension. Systolic and diastolic blood pressure (BP) and serum levels of IGF-I were determined before and at 1, 3, and 5 months after administration of capsaicin and isoflavone in 42 volunteers with alopecia, 29 normotensive and 13 hypertensive volunteers. Neither systolic nor diastolic BP changed in the normotensive volunteers after combined administration of capsaicin and isoflavone. In contrast, systolic and diastolic BP was significantly reduced in hypertensive volunteers after administration of capsaicin and isoflavone. Serum levels of IGF-I significantly increased in both normotensive and hypertensive volunteers after administration of capsaicin and isoflavone. These observations suggest that administration of capsaicin and isoflavone might reduce BP in hypertensive, but not in normotensive subjects, probably by increasing serum levels of IGF-I.