• Archives of Pharmacal Research
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• 제19권4호
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• pp.258-260
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• 1996

Palmatine, an protoberberine isoquinoline alkaloid, has been found to inhibit dopamine biosynthesis by reducing tyrosine hydroxylase (TH) activity in PC12 cells (Lee and Kim, 1996). We have therefore investigated the effects of palmatine on bovine adrenal TH. Palmatine showed a mild inhibition on bovine adrenal TH (36.4% inhibition at concentration of $200\muM$). Bovine adrenal TH was inhibited competitively by palmatine with a substrate L-tyrosine. The Ki value was found to be 0.67 mM. This result suggests that the inhibition of TH activity by palmatine may be partially involved in the reduction of dopamine biosynthesis in PC12 cells.

• BMB Reports
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• 제29권5호
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• pp.393-397
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• 1996

Sprague-Dawley male rats (150 g) were chronically treated with 5 v/v % ethanol admixed with nutritionally complete liquid diet and fed ad libitum for 3 weeks. Controls were pair fed with the isocaloric sucrose liquid diet. One half of each group was exposed to cold stress at $4^{\circ}C$ either for 24 h (for determination of mRNA by in situ hybridization) or for 48 h (for determination of enzyme activity). Chronic ethanol treatment (ethanol) did not affect tyrosine hydroxylase (TH) mRNA level in locus coeruleus (LC) of brain and adrenal medulla (AM) compared to controls. Cold stress showed strong increase of TH mRNA level in LC and AM compared to controls. Pretreated ethanol reduced the increased TH mRNA level by cold stress in LC and AM. Ethanol did not affect TH activity in LC and adrenal glands (adrenals). Cold stress increased TH activity in LC but not in adrenals. Pretreated ethanol did not reduce the increased TH activity by cold stress in LC but this result was not shown in adrenals. It is suggested that ethanol does not affect the message level and enzyme protein level for TH in LC and AM in normal rat. It is also hypothesized that pretreated ethanol reduces the magnitude of acute cold stress response, that is induction of TH mRNA in LC and AM, and does not reduce the increased TH enzyme protein that is also acute cold stress response in LC.

• Toxicological Research
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• 제3권1호
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• pp.9-14
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• 1987

The effects of monosodium glutamate (MSG) on the activities if tyrosine hydroxylase (TH), dopamine ${\beta}$-hydroxylase (DBH), tryptophan hydroxylase (TPH) and monoamine oxidase (MAO) in various regions (cerebral cortex, striatum, midbrain, pons and medulla of nat brain have been determined. It was observed that up to 1mM MSGhad no significant effects on the activities of brain tyrosine hydroxylase, dopamine ${\beta}$-hydroxylase, tryptophan hydroxylase and monoamine oxidase in all regions of rat brain. These results indicated that MSG itself exerted no direct effect on the important enzymes synthsizing and metabolizing the monoaminergic neuronal system.

• 한국동물번식학회:학술대회논문집
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• 한국동물번식학회 2002년도 춘계학술발표대회 발표논문초록집
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• pp.85-85
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• 2002

As an effort to direct differentiation of human embryonic stem cells (hES, MB03) to dopamine-producing neuronal cells, we expressed Nurr-l in hES and examined the expression of tyrosine hydroxylase (TH) after bFGF induction. To introduce Nurr-l, hES cells were maintained in humidified chamber with 5% CO₂ and 95% air in DMEM/Fl2 supplemented with FBS (10%), penicillin (100U/㎖), and streptomycin (100㎍/㎖). (omitted)

• 대한약리학회지
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• 제27권1호
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• pp.1-5
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• 1991

Streptozotocin(STZ)-유발 당뇨쥐에서 시상하부의 norepinephrine(NE) 대사를 기초 NE 함량, NE 교체율, in vivo tyrosine hydroxylase(TH) 활성을 그 지표로 하여 조사하였다. STZ (60 mg/kg, iv)로 당뇨를 유발한 후 4주까지 기초 NE 함량은 유의한 변화가 없었다. 그러나 당뇨유발 후 1주째에 측정한 NE 교체율은 대조치의 62%(p<0.01), in vivo TH 활성은 대조치의 34% (p<0.05)로 감소하였다. 이상의 결과로 본 실험에서 측정한 NE 대사의 세 지표 중에서 in vivo TH 활성이 STZ-유발 당뇨쥐의 시상하부 NE 대사의 변화를 가장 민감하게 반영하였다.

• Archives of Pharmacal Research
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• 제21권6호
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• pp.782-784
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• 1998

Ginseng total saponin (GTS) can modulate dopaminergic activity at both presynaptic and postsynaptic dopamine receptors (Kim et al, 1998). The present study investigated t he effect of GTS on the bovine adrenal tyrosine hydroxylase (TH), which catalyze L/tyrosine to DOP. GTS inhibited the bovine adrenal TH by 42.4, 51.5 and 55.3% at concentrations of 40, 80 and 100${\mu}g$/ml, respectively. The IC50 value of GTS was 77.5${\mu}g$/ml. GTS exhibited noncompetitive inhibition with a substrate L-tyrosine. The Ki value was 155${\mu}g$/ml.

• 대한물리치료과학회지
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• 제7권2호
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• pp.513-521
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• 2000

This study was carried out to investigate the effects of electrical stimulation on the change Tyrosine-Hydroxylase immunoreactive(TH-IR) cells in the Central gray and retrorubral field of the male SD rats. 9 healthy and normal rats were divided into three groups, 3 SD rat in each group. The one group has been stimulated by electroacupuncture(EA, 2Hz) for 30min and the other group by EA for 1hr 30min and control group has been stimulated. TH-IR cells were found in the Central gray(CG) and Retrorubral field(RF). The numbers of TH-IR cells of CG and RF were significantly increased after 30 min (CG $6.2{\pm}0.83$, RF $1.4{\pm}0.55$)as compared with control group(CG $24{\pm}3.16$, RF $6.4{\pm}0.55$) and were also significantly increased after 1hr 30min(CG $75.6{\pm}4.51$, RF $18.8{\pm}0.89$) than 30min. These results show that TH is related into CG and RF in response to electrical stimulation.

• Nutrition Research and Practice
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• 제4권4호
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• pp.270-275
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• 2010

Catecholamines are among the first molecules that displayed a kind of response to prolonged or repeated stress. It is well established that long-term stress leads to the induction of catecholamine biosynthetic enzymes such as tyrosine hydroxylase (TH) and dopamine ${\beta}$-hydroxylase (DBH) in adrenal medulla. The aim of the present study was to evaluate the effects of ginseng on TH and DBH mRNA expression. Repeated (2 h daily, 14 days) immobilization stress resulted in a significant increase of TH and DBH mRNA levels in rat adrenal medulla. However, ginseng treatment reversed the stress-induced increase of TH and DBH mRNA expression in the immobilization-stressed rats. Nicotine as a ligand of the nicotinic acetylcholine receptor (nAChR) in adrenal medulla stimulates catecholamine secretion and activates TH and DBH gene expression. Nicotine treatment increased mRNA levels of TH and DBH by 3.3- and 3.1-fold in PC12 cells. The ginseng total saponin exhibited a significant reversal in the nicotine-induced increase of TH and DBH mRNA expression, decreasing the mRNA levels of TH and DBH by 57.2% and 48.9%, respectively in PC12 cells. In conclusion, immobilization stress induced catecholamine biosynthetic enzymes gene expression, while ginseng appeared to restore homeostasis via suppression of TH and DBH gene expression. In part, the regulatory activity in the TH and DBH gene expression of ginseng may account for the anti-stress action produced by ginseng.

• 대한한의학방제학회지
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• 제17권1호
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• pp.163-173
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• 2009

Objectives : The goal of this study was to investigative the effect of Gardeniae Fructus (GF)as antidepressant in the forced swimming test(FST) model rats. Methods : The expressions of corticotropin-releasing factor(CRF), tyrosine hydroxylase (TH) and c-fos were measured by immunohistochemical method at paraventricular nucleus(PVN), locus coeruleus (LC) and ventral tegmental area(VTA). Results : The duration of immobility in FST was significantly decreased in the GF 100mg/kg groups (p<0.05). CRF expression was significantly decreased at PVN in the GF 100 mg/kg and 400mg/kg treated group in comparison with the control group, respectively (p<0.01). c-fos expression was decreased at PVN in the GF 100 mg/kg treated group with no significance. TH expression was significantly decreased in the GF 100 mg/kg and 400mg/kg treated group in comparison with the control group, at LC and VTA respectively (p<0.001). Conclusion : According to the results, it can be considered that Gardeniae Fructus has antidepressant effect by showing the reduction of immobility in FST through the reduction of CRF, TH expression.

• 대한한의학방제학회지
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• 제17권1호
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• pp.129-140
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• 2009

Objectives : The goal of this study was to investigate the effect of Moutan Cortex as antidepressant in forced swimming test(FST) model. Methods : The expressions of corticotropin-releasing Factor(CRF), c-Fos and tyrosine hydroxylase(TH) were measured with immunohistochemical method at paraventricular nucleus (PVN), locus coeruleus(LC) and ventral tegmental area(VTA). Results : The duration of immobility in the forced swimming test was significantly decreased in the Moutan Cortex 100 mg/kg treated group in comparison with the control group(p<0.01). CRF and c-Fos expressions at PVN were decreased in the Moutan Cortex 100mg/kg treated group in comparison with the control group. But only the expression of c-Fos was shown the significance(p<0.05). TH expressions at LC and VTA were significantly decreased in the Moutan Cortex 100mg/kg and 400mg/kg treated group in comparison with the control group(p<0.001). Conclusion : According to the results, Moutan Cortex has the antidepressant effect by showing the reduced immobility through the reduction of c-Fos expression at PVN and the reduction of TH expression at LC and VTA.