• 대한생식의학회:학술대회논문집
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• 1999.11a
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• pp.106-106
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• 1999

• 대한생식의학회:학술대회논문집
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• 1999.11a
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• pp.51-52
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• 1999

• Proceedings of the Zoological Society Korea Conference
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• 1999.10b
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• pp.178.1-178
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• 1999

No Abstract, See Full Text

• Journal of Microbiology and Biotechnology
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• v.29 no.12
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• pp.2026-2026
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• 2019

• Journal of Physiology & Pathology in Korean Medicine
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• v.21 no.1
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• pp.54-61
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• 2007

The study was designed to investigate the effects of Mixture of Yukgunja-tang and Bambusae Caulis in Liquamen (YTBCL) on the change of regional cerebral blood flow (rCBF) and mean arterial blood pressure (MABP) in rats, and further to determine the mechanism of action of YTBCL. The results in rats were as follows ; YTBCL 25 ${\mu}l$ significantly decreased rCBF and MABP compared with basal condition. YTBCL 100 ${\mu}l$ significantly increased rCBF compared with basal condition, but decreased MABP compared with basal condition. YTBCL 50 ${\mu}l$ significantly increased rCBF compared with basal condition, but MABP was somewhat decreased compared with basal condition. The VTBCL 50 ${\mu}l$-induced increase in rCBF was significantly inhibited by pretreatment with methylene blue (10 ${\mu}g$/kg, i.p.), an inhibitor of guanylate cyclase and indomethacin (1 mg/kg, i.p.), an inhibitor of cyclooxygenase. The YTBCL 50 ${\mu}l$-induced decreased MABP significantly increased by pretreatment with methylene blue but was inhibited by indomethacin. This results were suggested that the mechanism of YTBCL was mediated Dy guanylate cyclase.

• BMB Reports
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• v.49 no.2
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• pp.128-133
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• 2016

Astrocytes play a critical role in normal brain functions and maintaining the brain microenvironment, and defects in astrocytogenesis during neurodevelopment could give rise to severe mental illness and psychiatric disorders. During neuro-embryogenesis, astrocytogenesis involves astrocytic differentiation of neural precursor cells (NPCs) induced by signals from ciliary neurotrophic factor (CNTF) or pituitary adenylate cyclase-activating peptide (PACAP). However, in contrast to the CNTF signaling pathway, the exact mechanism underlying astrocytic differentiation induced by PACAP is unknown. In the present study, we aimed to verify a signaling pathway specific to PACAP-induced astrocytogenesis, using exchange protein directly activated by cAMP2 (Epac2)-knockout mice. We found that PACAP could trigger astrocytic differentiation of NPCs via Epac2 activation and an increase in the intracellular calcium concentration via a calcium ion influx. Taken together, we concluded that astrocytogenesis stimulated by PACAP occurs through a novel signaling pathway independent from CNTF-JAK/STAT signaling, that is the well-known pathway of astrocytogenesis.

• The Journal of Internal Korean Medicine
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• v.30 no.2
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• pp.298-305
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• 2009

Objectives: The present study was carried out to investigate the effects of Yupoongyangyeong-tang(YYT) on changes of regional cerebral blood flow (rCBF) and mean arterial blood pressure (MABP) in rats. In addition, the author also investigated action mechanisms of YYT on changes in rCBF and MABP. Methods and Results : In this study, treatment with YYT elevated rCBF in a dose-dependent manner, but MABP levels were elevated only in the 10 mg/ml treatment group. Pre-treatment with indomethacin. an inhibitor of cyclooxygenase, inhibited increase of rCBF effectively. Pre-treatment with methylene blue, an inhibitor of guanylate cyclase, inhibited increase of rCBF induced by YYT, too. In addition. pre-treatment with indomethacin also inhibited increase of MABP. However, pre-treatment with methylene blue did not affect MABP levels. Conclusion : These results suggest that YYT is useful to treat patients with diseases related to cerebral ischemia, because YYT can increase rCBF. In addition, the mechanisms are thought to be related to both cyclooxygenase and guanylate cyclase.

• Journal of Physiology & Pathology in Korean Medicine
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• v.18 no.4
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• pp.1083-1088
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• 2004

This Study was designed to investigate the mechanism of Prescription for Treatment Abundant Expectoration due to Deficiency of Qi(Yukgunja-Tang, YGT) on cerebral hemodynamics [regional cerebral blood f1ow(rCBF) and pial arterial diameter(PAD)] in cerebral ischemia rats. The results were as follows: Both rCBF and PAD were significantly and stably decreased by YGT (10㎎/㎏, i.p.) during the period of cerebral reperfusion, which contrasted with the findings of rapid and marked increase in Control group. Pretreatment with indomethacin(1㎎/㎏, i.p.), an inhibitor of cyclooxygenase and methylene blue(10㎍/㎏, i.p.), an inhibitor of guanylate cyclase significantly but unstably increased the YGT-induced increases in rCBF during the period of cerebral reperfusion. Pretreatment with indomethacin significantly and stably decreased the YGT-induced increases in PAD during the period of cerebral reperfusion, but pretreatment with methylene blue increased unstably the YGT-induced increases in PAD during the period of cerebral reperfusion. In conclusion, the present authors thought that mechanism of YGT on cerebral hemodynamics was connected with guanylate cyclase in cerebral ischemia rats.

• The Korean Journal of Physiology and Pharmacology
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• v.13 no.6
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• pp.409-416
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• 2009

Acute pancreatitis is a multifactorial disease associated with the premature activation of digestive enzymes. The genes expressed in pancreatic acinar cells determine the severity of the disease. The present study determined the differentially expressed genes in pancreatic acinar cells treated with cerulein as an in vitro model of acute pancreatitis. Pancreatic acinar AR42J cells were stimulated with $10^{-8}$ M cerulein for 4 h, and genes with altered expression were identified using a cDNA microarray for 4,000 rat genes and validated by real-time PCR. These genes showed a 2.5-fold or higher increase with cerulein: lithostatin, guanylate cyclase, myosin light chain kinase 2, cathepsin C, progestin-induced protein, and pancreatic trypsin 2. Stathin 1 and ribosomal protein S13 showed a 2.5-fold or higher decreases in expression. Real-time PCR analysis showed time-dependent alterations of these genes. Using commercially available antibodies specific for guanylate cyclase, myosin light chain kinase 2, and cathepsin C, a time-dependent increase in these proteins were observed by Western blotting. Thus, disturbances in proliferation, differentiation, cytoskeleton arrangement, enzyme activity, and secretion may be underlying mechanisms of acute pancreatitis.

• Journal of Physiology & Pathology in Korean Medicine
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• v.16 no.6
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• pp.1127-1133
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• 2002

Cheonghunhwadam-tang(CHT) have been used in oriental medicine for many centuries as a therapeutic agent of vertigo by wind, fire and phlegm. CHTGR was CHT adding Gastrodae Rhizoma. The effects of CHTGR on the regional cerebral blood flow(rCBF) and mean arterial blood pressure(MABP) is not known. A comparative Study of action-mechanism of CHT and CHTGR on the cerebral hemodynamics is not known too. Therefore, purpose of this Study was to investigate effects of CHT and CHTGR on the rCBF and MABP, compare action-mechanism of CHT and CHTGR on the rCBF and MABP. The changes of rCBF and BP was determinated by Laser-Doppler Flowmetry(LDF). The results were as follows ; CHT extract was increased rCBF in a dose-dependent, but was not changed MABP compared with CHT non-treated group. CHTGR extract was decreased rCBF and MABP compared with CHTGR non-treated group in a dose-dependent. Action of CHT is not related with adrenergic β-receptor, cyclooxygenase and guanylate cyclase, but action of CHTGR is related with guanylate cyclase.