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Life Sci. 2000 Sep 22;67(18):2189-200.
Effects of baicalein and wogonin on drug-metabolizing enzymes in C57BL/6J mice.

Ueng YF, Shyu CC, Lin YL, Park SS, Liao JF, Chen CF.

National Research Institute of Chinese Medicine, Taipei, Taiwan, ROC. uenma23.nricm.edu.tw

Effects of baicalein and wogonin, the major flavonoids of Scutellariae radix, on cytochrome P450 (CYP), UDP-glucuronosyl transferase (UGT), and glutathione S-transferase (GST) were studied in C57BL/6J mice. One-week treatment of mice with a liquid diet containing 5 mM baicalein resulted in 29%, 14%, 36%, 28%, and 46% decreases of hepatic benzo(a)pyrene hydroxylation (AHH), benzphetamine N-demethylation (BDM), N-nitrosodimethylamine N-demethylation (NDM), nifedipine oxidation (NFO), and erythromycin N-demethylation (EMDM) activities, respectively. Treatment with a liquid diet containing 5 mM wogonin resulted in 43%, 22%, 21%, 24%, and 35% decreases of hepatic AHH, BDM, NDM, NFO, and EMDM activities, respectively. However, hepatic 7-methoxyresorufin O-demethylation (MROD) activity was increased and decreased by baicalein- and wogonin-treatments, respectively. Similar modulation was observed with caffeine 3-demethylation (CDM) activity. Immunoblot analysis showed that the levels of hepatic CYP2E1 and CYP3A proteins were decreased by both baicalein- and wogonin-treatments. Hepatic CYP1A2 protein level was increased by baicalein but decreased by wogonin. In extrahepatic tissues, renal AHH activity was decreased by wogonin whereas pulmonary AHH, 7-ethoxyresorufin O-deethylation (EROD), and MROD activities were increased by both flavonoids. Both baicalein and wogonin strongly increased CYP1A protein level in mouse lung. Hepatic and renal UGT activities toward p-nitrophenol were suppressed by baicalein- and wogonin-treatments. However, cytosolic GST activity was not affected by flavonoids. These results suggest that ingestion of baicalein or wogonin can modulate drug-metabolizing enzymes and the modulation shows tissue specificity.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11045600&dopt=Abstract

Am J Physiol Heart Circ Physiol. 2000 Nov;279(5):H2104-15.
Regulation of a voltage-sensitive release mechanism by Ca(2+)-calmodulin-dependent kinase in cardiac myocytes.

Zhu J, Ferrier GR.

Department of Pharmacology, Dalhousie University, Halifax, Nova Scotia, Canada.

A role for Ca(2+)-calmodulin-dependent kinase (CamK) in regulation of the voltage-sensitive release mechanism (VSRM) was investigated in guinea pig ventricular myocytes. Voltage clamp was used to separate the VSRM from Ca(2+)-induced Ca(2+) release (CICR). VSRM contractions and Ca(2+) transients were absent in cells dialyzed with standard pipette solution but present when 2-5 microM calmodulin was included. Effects of calmodulin were blocked by KN-62 (CamK inhibitor), but not H-89, a protein kinase A (PKA) inhibitor. Ca(2+) current and caffeine contractures were not affected by calmodulin. Transient-voltage relations were bell-shaped without calmodulin, but they were sigmoidal and typical of the VSRM with calmodulin. Contractions with calmodulin exhibited inactivation typical of the VSRM. These contractions were inhibited by rapid application of 200 microM of tetracaine, but not 100 microM of Cd(2+), whereas CICR was inhibited by Cd(2+) but not tetracaine. In undialyzed myocytes (high-resistance microelectrodes), KN-62 or H-89 each reduced amplitudes of VSRM contractions by approximately 50%, but together they decreased VSRM contractions by 93%. Thus VSRM is facilitated by CamK or PKA, and both pathways regulate the VSRM in undialyzed cells.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11045943&dopt=Abstract

J Auton Pharmacol. 2000 Feb;20(1):31-6.
Lack of Ca2+- and ATP-dependent priming stage in caffeine-induced exocytosis in bovine adrenal chromaffin cells: comparison with Ca2+.

Matsumura C, Kuwashima H, Kimura T.

Department of Dental Pharmacology, The Nippon Dental University School of Dentistry at Niigata, Hamauracho, Japan.

1. Caffeine (20-40 mM) secreted catecholamines from beta-escin-permeabilized bovine adrenal chromaffin cells in the presence or absence of 2 mM MgATP. The caffeine-induced catecholamine secretion in the presence of MgATP was to the same extent as that in the absence of MgATP. 2. Ca2+ (0.1-10 microM) induced a significantly greater secretion of catecholamines in the presence of MgATP than in the absence of MgATP. 3. ML-9 (100 microM) and ML-7 (100 microM), myosin light chain kinase inhibitors, and W-7 (100 microM) and trifluoperazine (TFP; 30 microM), calmodulin antagonists, inhibited the Ca2+-induced catecholamine secretion in the presence of MgATP but not in the absence of MgATP. They did not inhibit the caffeine-induced catecholamine secretion in the presence of MgATP. 4. The ATP-independent phase in Ca2+-dependent exocytosis is thought to be associated with the final step that ultimately leads to fusion, while the ATP-dependent phase is thought to be associated with a vesicle priming reaction. Therefore, these results suggest that the ATP-requiring priming stage is lacking in the process of caffeine-induced exocytosis in bovine adrenal chromaffin cells.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11048959&dopt=Abstract

The average human scalp is covered by approximatey 100,000 hair follicles. Each hair undergoes hair cycle and normally 50-100 hairs randomly fall out a day, which is unnoticeable because lost hair is replaced by as many new hairs springing up daily. Hair loss results from the fall out of hair from the hair follicle. Alopecia or excessive, premature hair loss is the condition caused by many factors. Loss of hair itself does not pose critical health problems because biological role of human hair is relatively marginal. Hair on our scalp protects the head from mechanical shock, heat loss, and exposure to UV-light. The eyelashes and eyebrowes protect the eyes, and hair in the ear canal or the nasal passages help filter out particles and pathogens, thus protecting our internal organs. However, hair does play important social role: it is one of the major determinants of our appearance and identity in daily life. Fullness of hair also implicates or manifests physical integrity and youthfulness of the person. Losing hair could have more than just emotional impacts on individuals. The hair is a unique organ that goes through a characteristic cycle consisting of an immature phase, a growing phase called anagen, a transitional phase between the growing phase and the resting phase called catagen, and finally a resting phase called telogen in which the hair stops growing, waiting to fall out. 85-90% of hairs on our body are in anagen phase or growing phase, which lasts anywhere from two to five years. This phase is followed by a short regression phase, or catagen, which lasts 2-3 weeks. Approximately 1% of hair follicles are in catagen. Approximately 10-15% of hair follicles are in the resting phase, the telogen, which lasts about 3-5 months. Hair follicles typically goes through 10-20 asynchronous cycles during the lifetime. Persistent loss of more than 150 hairs would consist a state of hair loss, or alopecia, albeit it could be temporary.

DHEA is a natural hormone, and it is produced in our body by the adrenal glands. DHEA has been suggested to provide numerous potential benefits. DHEA (or dehydroepiandrosterone) is converted into androgens (male hormones) or estrogens (female hormones) in the cells. Our bodies produce decreasing amount of DHEA as we get older. various health benefits: To deter aging, improve sexual function/erectile dysfunction, treat cognitive decline, enhance athletic performance, facilitate weight loss, improve strength, prevent osteoporosis, enhance immunomodulation for rheumatic conditions, and treat depression.

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