Abstract
In the present investigation, we test the hypothesis that progesterone can rapidly relax, via a nongenomic mechanism, persistent flow occluding, agonist-activated coronary artery (CA) vasospasm, and hyperreactive vascular muscle cell (VMC) Ca 2+ responses in ovariectomized rhesus monkeys. CA vasospasm, induced by injection of 100 μM serotonin and 1 μM U-46619 (5-HT+U; 1 ml/30 s), resulted in a decrease in CA diameter (φ) from 1.8 ± 0.2 to 0.3 ± 0.1 mm at the site of focal constriction. Injection of 100 ng progesterone into the CA significantly relieved the severe vasoconstriction (1.3 ± 0.2 mm) and reestablished distal flow in 3 min; the preconstriction φ was completely restored in 8.2 ± 2.6 min (n = 6). Similarly, cell impermeant albumin-conjugated progesterone, but not albumin-conjugated 17β-estradiol, decreased 5-HT+U stimulated VMC Ca 2+ responses (250 ± 34% of basal 30 min after stimulation) back to the prestimulation level (113 ± 17% of basal) in 25 min (half time = 7 min). The presence of a rapid vasodilator action of progesterone in the primate CA and isolated VMC suggests its benefits in hormone replacement therapy may also include nongenomic vascular relaxant actions.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 701-708 |
| Number of pages | 8 |
| Journal | Journal of Applied Physiology |
| Volume | 92 |
| Issue number | 2 |
| State | Published - 2002 |
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Keywords
- Angiography
- Low-dose progesterone
- Nongenomic effects
- Ovarian steroids
- Vascular muscle cell
- Vasospasm
ASJC Scopus subject areas
- Physiology
- Endocrinology
- Orthopedics and Sports Medicine
- Physical Therapy, Sports Therapy and Rehabilitation
Cite this
Nongenomic vasodilator action of progesterone on primate coronary arteries. / Minshall, Richard D.; Pavcnik, Dusan; Browne, David L.; Hermsmeyer, Kent.
In: Journal of Applied Physiology, Vol. 92, No. 2, 2002, p. 701-708.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Nongenomic vasodilator action of progesterone on primate coronary arteries
AU - Minshall, Richard D.
AU - Pavcnik, Dusan
AU - Browne, David L.
AU - Hermsmeyer, Kent
PY - 2002
Y1 - 2002
N2 - In the present investigation, we test the hypothesis that progesterone can rapidly relax, via a nongenomic mechanism, persistent flow occluding, agonist-activated coronary artery (CA) vasospasm, and hyperreactive vascular muscle cell (VMC) Ca 2+ responses in ovariectomized rhesus monkeys. CA vasospasm, induced by injection of 100 μM serotonin and 1 μM U-46619 (5-HT+U; 1 ml/30 s), resulted in a decrease in CA diameter (φ) from 1.8 ± 0.2 to 0.3 ± 0.1 mm at the site of focal constriction. Injection of 100 ng progesterone into the CA significantly relieved the severe vasoconstriction (1.3 ± 0.2 mm) and reestablished distal flow in 3 min; the preconstriction φ was completely restored in 8.2 ± 2.6 min (n = 6). Similarly, cell impermeant albumin-conjugated progesterone, but not albumin-conjugated 17β-estradiol, decreased 5-HT+U stimulated VMC Ca 2+ responses (250 ± 34% of basal 30 min after stimulation) back to the prestimulation level (113 ± 17% of basal) in 25 min (half time = 7 min). The presence of a rapid vasodilator action of progesterone in the primate CA and isolated VMC suggests its benefits in hormone replacement therapy may also include nongenomic vascular relaxant actions.
AB - In the present investigation, we test the hypothesis that progesterone can rapidly relax, via a nongenomic mechanism, persistent flow occluding, agonist-activated coronary artery (CA) vasospasm, and hyperreactive vascular muscle cell (VMC) Ca 2+ responses in ovariectomized rhesus monkeys. CA vasospasm, induced by injection of 100 μM serotonin and 1 μM U-46619 (5-HT+U; 1 ml/30 s), resulted in a decrease in CA diameter (φ) from 1.8 ± 0.2 to 0.3 ± 0.1 mm at the site of focal constriction. Injection of 100 ng progesterone into the CA significantly relieved the severe vasoconstriction (1.3 ± 0.2 mm) and reestablished distal flow in 3 min; the preconstriction φ was completely restored in 8.2 ± 2.6 min (n = 6). Similarly, cell impermeant albumin-conjugated progesterone, but not albumin-conjugated 17β-estradiol, decreased 5-HT+U stimulated VMC Ca 2+ responses (250 ± 34% of basal 30 min after stimulation) back to the prestimulation level (113 ± 17% of basal) in 25 min (half time = 7 min). The presence of a rapid vasodilator action of progesterone in the primate CA and isolated VMC suggests its benefits in hormone replacement therapy may also include nongenomic vascular relaxant actions.
KW - Angiography
KW - Low-dose progesterone
KW - Nongenomic effects
KW - Ovarian steroids
KW - Vascular muscle cell
KW - Vasospasm
UR - http://www.scopus.com/inward/record.url?scp=0036092594&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0036092594&partnerID=8YFLogxK
M3 - Article
VL - 92
SP - 701
EP - 708
JO - Journal of Applied Physiology
JF - Journal of Applied Physiology
SN - 8750-7587
IS - 2
ER -