• 제목/요약/키워드: isolated contraction

검색결과 365건 처리시간 0.043초

가감정기탕(加減正氣湯), 가미화정전(加味和正煎), 가미통규탕(加味通竅湯)이 기도점액 분비에 미치는 영향 (Effects of Gagam-jeonggitang, Gami-hwajeongjeon and Gami-tonggyutang on secretion of airway mucus In Vitro and In Vivo)

  • 한재경;김윤희;채호연
    • 대한한방소아과학회지
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    • 제21권1호
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    • pp.117-137
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    • 2007
  • Objectives : In the present study, the author intended to investigate Gagam-jeonggitang(GJT), Gami-hwajeongjeon(GHJ) and Gami-tonggyutang(GTT) significantly affect in vivo and in vitro mucin secretion from airway epithelial cells. Methods : In vivo experiment, the author induced hypersecretion of airway mucin, hyperplasia of tracheal goblet cells and the increase in intraepithelial mucosubstances by exposing rats to SO2 during 3 weeks. Effects of orally-administered GJT, GHJ and GTT during 1 week on in vivo mucin secretion and hyperplasia of tracheal goblet cells were assesed using ELISA and staining goblet cells with alcian blue. For in vitro experiment, confluent HTSE cells were metabolically radiolabeled with 3H-glucosamine for 24 hrs and chased for 30 min in the presence of each agent to assess the effects of each agent on 3H-mucin secretion. Possible cytotoxicities of each agent were assessed by measuring lactate dehydrogenase release. Also, the effects of each agent on contractility of isolated tracheal smooth muscle and effects of each agent on MUC5AC gene expression in cultured HTSE cells were investigated. Results : GJT, GHJ and GTI inhibited hypersecretion of in vivo mucin: GJT and GHJ inhibited the increase of number of goblet cells. However, GTT did not affect the increase of number of goblet cells; GJT and GTT significantly increased mucin secretion from cultured HTSE cells, without significant cytotoxicity. GHJ increased mucin secretion and showed mild cytotoxicity at the highest concentration: GJT, GHJ and GTT chiefly affected the 'mucin' secretion; GJT, GHJ and GTT did not affect Ach-induced contraction of isolated tracheal smooth muscle; GTT did not significantly affect the expression levels of MUC5AC gene. However, GJT significantly. inhibit the expression levels of MUC5AC gene and GHJ significantly increased the expression levels of MUC5AC gene. These results suggest that GJT, GHJ and GTI can increase mucin secretion during short-term treatment(in vitro), whereas it can inihibit hypersecretion of mucin during long-term treatment(in vivo) and GJT and GHJ can not only affect the secretion of mucin but also affect the expression of mucin gene. Conclusions : The author suggests that the effects GJT, GHJ and GTT with their components should be further investigated and it is valuable to find, from oriental medical prescriptions, novel agents which might regulate hypersecretion of mucin from airway epithelial cells.

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보중익기탕 가미방(補中益氣湯 加味方)과 선방패독탕(仙方敗毒湯)이 기도 점액의 분비와 뮤신 유전자발현에 미치는 영향 (Effects of Bojung-ikgitang-gamibang and Seonbang-paedoktang on Secretion of Airway Mucus and Expression of Mucin Gene)

  • 정창호;한재경;김윤희
    • 대한한방소아과학회지
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    • 제21권3호
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    • pp.33-55
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    • 2007
  • Objectives In the present study, the author intended to investigate whether bojung-ikgitang-gamibang(BJGB) and seonbang-paedoktang(SBPT) significantly affect in vivo and in vitro mucin secretion from airway epithelial cells. Methods In vivo experiment, mice's mucin which is on a hypersecretion of airway mucin, mice's tracheal goblet cells in hyperplasia and mice's intraepithelial mucosubstances were exposed with SO2for3weeks. Effects of orally-administered BJGB and SBPT during 1 week on vivo mucin secretion and hyperplasia of tracheal goblet cells were assessed by using both enzyme-linked immunosorbent assay(ELISA) and staining goblet cells with alcian blue. In vitro experiment, confluent hamster tracheal surface epithelial(HTSE) cells were metabolically radiolabeled with 3H-glucosamine for 24hrs and chased for 30 min in the presence of each agent to figure out the effectiveness of 3H-mucin secretion. Total elution profiles of control spent media and treatment sample through Sepharose CL-4B column were analyzed. The effects of each agent on contractility of isolated tracheal smooth muscle and effects of each agent on MUC5AC gene expression in cultured HTSE cells were investigated. Also, possible cytotoxicities of each agent were assessed by measuring lactate dehydrogenase(LDH) release. Additionally, effects of BJGB and SBPT on both MUC5AC gene expression in cultured HTSE cells and TNF- or EGF-induced MUC5AC gene expression in human airway epithelial cells (NCI-H292) were investigated. Results (1) BJGB and SBPT inhibited hypersecretion of in vivo mucin. SBPT also inhibited the increase the number of goblet cells. However, BJGB did not affect the increase of number of goblet cells; (2) BJGB significantly increased mucin secretion from cultured HTSE cells, without significant cytotoxicity, and chiefly affected the 'mucin' secretion; (3) SBPT did not affect mucin secretion from cultured HTSE cells without significant cytotoxicity, and also did not affect the secretion of the other releseable glycoproteins; (4) BJGB and SBPT did not affect Ach-induced contraction of isolated tracheal smooth muscle; (5) SBPT significantly inhibit the expression levels of MUC5AC gene and BJGB significantly increased the expression levels of MUC5AC gene in both HTSE cells and NCI-H292 cells. Conclusions BJGB and SBPT can not only affect the secretion of mucin but also affect the expression of mucin gene. The author suggests that the effects BJGB and SBPT with their components should be further investigated and it is highly desirable to find from oriental medical prescriptions, novel agents which might regulate hypersecretion of mucin from airway epithelial cells.

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가미통규탕(加味通竅湯)이 호흡기 뮤신 분비 및 기관 평활근 긴장도에 미치는 영향 (Effect of Gamitonggyu-tang on Secretion of Airway Mucin and Contractility of Tracheal Smooth Muscle)

  • 이남열;한재경;김윤희
    • 대한한방소아과학회지
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    • 제21권3호
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    • pp.109-124
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    • 2007
  • Objectives In the present study, the author intended to investigate whether Gamitonggyu-tang (GTT) significantly affects (since the subject is GTT, you need an 's') in vivo and in vitro mucin secretion from airway epithelial cells. Methods In vivo experiment, mice's mucin which is on a hypersecretion of an airway, mice's tracheal goblet cells in hyperplasia and mice's intraepithelial mucosubstances were exposed with SO2 for 3 weeks. Effects of orally-administered GTT for 1 week on in vivo mucin secretion and hyperplasia of tracheal goblet cells were assessed by using enzyme-linked immunosorbent assay (ELISA) and staining goblet cells with alcian blue. In vitro experiment, confluent hamster tracheal surface epithelial (HTSE) cells were metabolically radiolabeled with 3H-glucosamine for 24 hrs and chased for 30 min in the presence of GTT to figure out the effectiveness of 3H-mucin secretion. Total elution profiles of control spent media and treatment sample through Sepharose CL-4B column were analyzed.Possible cytotoxicities of each agent were assessed by measuring lactate dehydrogenase (LDH) release. Also, the effect of GTT on contractility of isolated tracheal smooth muscle was investigated. Results (1) GTT inhibited hypersecretion of in vivo mucin. However, it did not affect the increase the number of goblet cells (2) GTT significantly increased mucin release from cultured HTSE cells, without significant cytotoxicity (3) GTT chiefly affected the 'mucin' secretion and did not affect the secretion of the other releasable glycoproteins with less molecular weight than mucin (4) GTT did not affect Ach-induced contraction of isolated tracheal smooth muscle.Conclusions This result suggests that GTT can increase mucin secretion during short-term treatment (in vitro) whereas it can inihibit hypersecretion of mucin during long-term treatment (in vivo). The author suggests that the effect GTT with their components should be further investigated and it is valuable to find from oriental medical prescriptions, novel agents which might regulate mucin secretion from airway epithelial cells.

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참취 및 씀바귀 첨가식이가 고지혈증 흰쥐의 심혈관 수축과 이완 및 혈관내피세포에 미치는 영향 (Effect of Aster scaber and Ixeris dentata on Contractility and Vasodilation of Cardiovascula and Endothelial Cell in Hyperlipidemic Rat)

  • 임상선;이종호
    • 한국식품영양과학회지
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    • 제26권2호
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    • pp.300-307
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    • 1997
  • 국화과에 속하는 식용식물중 참취 및 씀바귀가 고지혈증 흰쥐의 지질대사와 심혈관계에 미치는 영향을 구명하기 위하여 S.D.계 흰쥐에게 각각의 분말 5%와 그에 상당하는 열수추출물을 급이하여 4주간 실험사육한 후 적출한 심장과 혈관의 수축 이완반응 및 혈관 내피세포의 형태학적 변화를 관찰하였다. 심방근의 isopreterenol에 대한 반응에서 우심방근의 박동수는 각 분말급이군에서 대체로 낮은 수치를 보였다. 흉부 대동맥의 phenylephrine과 calcium 투입에 의한 혈관의 수축반응은 대조군에 비하여 각 시료급이군에서 유의하게 낮았으며 특히 분말군이 추출물군 보다 수축반응이 낮게 나타났다. 흉부 대동맥의 acetylcholine에 의한 이완반응은 각 시료급이군이 대조군에 비해 이완도가 대체로 큰 것으로 나타났고, 특히 참취 분말군이 유의하게 높았다. 혈관 내피세포의 전자현미경적 관찰결과에 의하면 참취 분말군이 내피세포의 손상이 가장 적었으며 씀바귀 분말군에서도 손상이 상당히 지연되었으나 추출물군에서 대조군 보다 손상의 정도는 약하지만 각각의 분말군 보다 많은 것으로 나타났다. 이러한 결과들을 종합하여 볼 때 참취와 씀바귀는 혈중 콜레스테롤과 LDL 및 VLDL 등의 농도를 저하시키므로써 혈관수축과 이완반응 및 혈관내피세포의 변화를 지연시킨 것으로 생각되며 참취나 씀바귀의 분말상태로의 급여는 분말중의 섬유소나 열수로 추출되지 않는 성분들로 인하여 추출하였을 때 보다 이러한 효과가 더욱 뚜렷한 것으로 나타나는데 참취와 씀바귀의 이러한 작용은 심장 순환기계질환의 치료와 예방에 긍정적인 영향을 줄 것으로 기대된다.시켰다. 이와 같은 결과로 보아 A. keiskei에 의한 혈장 cholesterol의 감소는 cholesterol 흡수의 감소 및 cholesterol을 cholestanol으로의 전환과 담즙산으로의 배설이 증가됨에 일부 기인하는 것으로 사료된다.를 유도할 수 있었다. 또한 식이 kg당 3g의 Met과 0.45mg의 Se 동시 공급시 원활한 알코올대사를 유도하여 알코올성 간손상을 가장 효율적으로 경감시킬 수 있는 것으로 나타났다.{\sim}17$%로 다양(多樣)하였다. 7. 1000립중(粒重)은 개화(開花) 소요일수(所要日數)와 초장(草長) 그리고 성숙립수(成熟粒數)와 등숙율(登熟率)과는 고도(高度)의 정(正)의 상관(相關)을 보였으나 잎마름병 발생율(發生率)과 조명나방 발생율(發生率)과는 5%의 유의(有意)한 부상관(負相關)를 보였다. 농도가 감소되었을 때, ATPase 활성은 증가하였다. 위의 조건에서 실제 마이크로솜 내부로의 $Ca^{2+}$ 유입 여부는 $‘Ca^{2+}’$를 이용하여 확인하였다. 이상의 결과는 마이크로솜 막에 위치한 ATPase의 내부 및 외부에 $Ca^{2+}$에 의한 효소활성 조절부위가 각각존재함을 시사한다. $10{\sim}11.99\;ppm$, 14품종(21.5%)이 $12{\sim}13.99\;ppm$, 9품종(13.8%)이 $14{\sim}15.99\;ppm$, 10품종(15.4%)이 $16{\sim}17.99\;ppm$, 4품종(6.2%)이

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흰쥐 장관에 있어 칼륨에 의해 활성화되는 칼슘 채널에 대한 Cyclobuxine E의 영향 (Effects of Cyclobuxine E on Two Distinct Types of Potassium-Activated Calcium Channels in an Intestinal Smooth Muscle)

  • 이종화;권준택;조병헌;최규홍;김유재;김종배;김천숙;차영덕;김영석
    • 대한약리학회지
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    • 제25권1호
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    • pp.53-58
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    • 1989
  • 본 연구실에는 최근 수년동안 말라리아, 성병등에 민간약으로 사용되어 온 회양목(Buxus microphylla var. koreana Nakai)으로 부터 다수의 물질을 분리하여 그 약리작용을 경색하여왔다. Coumarin의 유도체인 buxuletin은 이뇨 작용이 있음이 인정되었으며, steroid 성 alkaloid인 Cyclobuxine $D(C_{25}H_{42}ON_2)$는 항염증작용, 흰쥐에서 심박동수 감소작용 및 적출 평활근 이완 작용을 나타냈다. 본 연구에서는 회양목에서 Cyclobuxine D의 유도체인 Cyclobuxine $E(C_{24}H_{38}ON_2)$를 분리하여 그 구조를 이화학적인 방법으로 규명하였으며 흰쥐의 십이지장 평활근에서 acetylcholine에 의해 유도되는 수축 작용에 대한 영향과 높은 칼륨 이온에 의해 활성화되는 칼슘 채널에 대한 Cyclobuxine E의 영향을 관찰하였다. Cyclobuxine E는 적출 십이지장 평활근에서 acetylcholine의 수축작용을 현저히 억제하였으며, Calcium-depleted potassium-depolarizing 용액에 담근 후 $CaCl_2$를 가함으로써 나타나는 이중적인 수축작용을 용량적으로 차단하였다. 이상의 십이지장 평활근에 대한 Cyclobuxine E의 작용은 Cyclobuxine E가 칼륨에 의해 활성화되는 칼슘 채널 (아마, voltage-dependent calcium channel)을 통한 칼슘의 세포막 통과를 차단하므로 인해 나타남을 시사한다.

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토끼의 적출장관 운동에 대한 Choline Esters의 $pD_2$ ($pD_2$ Value of Choline Esters on Motility of Isolated Rabbit Jejunum Segment)

  • 박준형;김영환;김길수
    • Current Research on Agriculture and Life Sciences
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    • 제7권
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    • pp.231-235
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    • 1989
  • Choline과 choline esters인 acetylcholine, methacholine, carbachol, bethanechol이 토끼의 적출장관 운동에 미치는 영향과 각 약물의 $pD_2$값을 산출하여 각각 비교를 하였다. Choline은 최대유효농도가 $10^{-2}M$이었으며 $ED_{50}$$2.4{\times}10^{-3}M$이었고 $pD_2$값은 2.619이었다. Acetylcholine은 최대유효농도가 $10^{-4}M$이었으며 $10^{-9}M$에서는 거의 효과가 나타나지 않았고 $ED_{50}$$0.5{\times}10^{-5}M$이었고 $pD_2$값은 5.154이었다. Methacholine은 최대유효농도가 $10^{-5}M$이었으며 $10^{-9}M$에서는 거의 효과가 나타나지 않았고 $ED_{50}$$9{\times}10^{-5}M$이었고 $pD_2$값은 6.045이었다. Carbachol은 최대유효농도가 $10^{-5}M$이었으며 $10^{-11}M$에서는 거의 효과가 나타나지 않았고 $ED_{50}$$5.7{\times}10^{-7}M$이었고 $pD_2$값은 6.244이었다. Bethanechol은 최대유효농도가 $10^{-4}M$이었으며 $10^{-8}M$에서는 거의 효과가 나타나지 않았고 $ED_{50}$$3.3{\times}10^{-6}M$이었고 $pD_2$값은 5.480이었다. Choline esters는 토끼의 적출장관 운동에 대하여 수축을 일으켰으며 각 약물의 potency의 순서는 carbachol이 가장 강하게 나타났고 methacholine, bethanechol, acetylcholine, choline의 순으로 나타났다.

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적출된 토끼와 자라심장에서의 $Ca^{++}$ Pool ($Ca^{++}$ Polls in Isolated Rabbit and Turtle Heart)

  • 김인교;이중우;강두희
    • The Korean Journal of Physiology
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    • 제9권1호
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    • pp.13-22
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    • 1975
  • From the study of movements of $Ca^{++}$ in frog cardiac muscle, Niedergerke (1963) postulated that $Ca^{++}$ necessary for the cardiac contraction is stored in a specific pool. Langer et al (1967) and DeCaro (1967) also found a close relationship between the change of $Ca^{++}$ flux kinetics and the change of contractile force. According to the studies of several investigators, Ca II (Bailey and Dressel 1968) or phase I and II (Langer 1965, Langer et al 1967, 1971) in the $Ca^{++}$ washout curve was associated with cardiac contractility. This investigation was aimed to elucidate the anatomical region of the contractile active $Ca^{++}$ pool. At the same time, it was assumed in this study that $Ca^{++}$ in the sarcoplasmic reticulumn represents one of the major intracellular $Ca^{++}$ pool and cardiac contractility was also dependent on the intracellular $Ca^{++}$ concentration. Consequently, this experiment was performed at different temperatures to activate to activate inhibit the deactivating process of activated $Ca^{++}$ in the intracellular space to see if changes in the contractility decay curve existed at different temperatures. The isolated hearts of rabbits and turtles (Amyda maackii) were attached to the perfusion apparatus according to the method employed by Bailey and Dressel (1968). The isolated hearts were initally perfused with a full Ringer solution containing 2 mg/ml of inulin for 1 hr, and then $Ca^{++}$ and inulin-free Ringer solution was perfused while the isometric tension was recorded and a serial sample of perfusion fluid dripping from the cardiac apex was collected for 10 sec throughout experimental period. The above procedure was performed at $23^{\circ}C$, $30^{\circ}C$ and $38^{\circ}C$ on the rabbit heart and $10{\sim}13^{\circ}C$, $10^{\circ}C$, $25^{\circ}C$, $30^{\circ}C$ and $35^{\circ}C$ on the turtle heart. After determination of $Ca^{++}$ and inulin concentration of the samples, the $Ca^{++}$, inulin washout curve and the contractile tensin decay curve were analysed according to the method of Riggs (1963). The results were summarized as follows; 1. In the rabbit heart, there are 2 inulin compartments, 3 $Ca^{++}$ compartments and sing1e exponential decay of contractile tension. In the turtle heart, there are $1{\sim}2$ inulin compartments, $1{\sim}2$ $Ca^{++}$ compartments and $1{\sim}2$ phases of contractile tension decay. The fact that the inulin space was divided into 3 compartments in the washout curve in these hearts indicates the presence of heterogeneity in cardiac perfusion, i.e., overfused and underperfused area. 2. Ca I a9d Ca II in these hearts were found to have $Ca^{++}$ in the ECF compartments because their half times in the washout curves were far smaller than those of the inulin washout curves in the rabbit heart and similar to those of the inulin washout curves in the turtle heart. Ca III in the rabbit heart may have originated from the intracellular $Ca^{++}$ store. But no Ca III in the turtle heart was found. This may be due to the fact that the iutracellular $Ca^{++}$ pool in the turtle heart was too small to detect using this experimental procedure since sarcoplasmic reticulumn in the turtle heart is poorly developed. 3. In the rabbit heart, there were no chages in the half time of Ca I, Ca II, inulin I and inulin II at different temperatures, but the half time of Ca III was significantly prolonged at lower temperatures, and the half time of the contractile tension decay tended to be prolonged at lower temperatures but this was not significant. In the turtle heart, there were no changes in the half time of Ca I, Ca II, inulin 1, inulin II and phase I of the contractile tension decay at different temperatures, but the half time of phase II of the contractile tension decay was significantly prolonged at lower temperatures. This finding indicates that intracellu!ar $Ca^{++}$ in these hearts was also responsible particulary for maintaining the cardiac contractility at the lower temperatures. 4. The half times of contractile tension decay were shorter than those of Ca II in the $Ca^{++}$ washout curves in both animal hearts. According to the above results it was shown that $Ca^{++}$ in ECF is primarily and $Ca^{++}$ in the intracellular space is partially associated with the cardic contractility.

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한국인 비만 여성의 GNB3, ACE, ADRB3, ADRB2 유전자 다형성간의 상호관계에 관한 연구 (Study of Gene-gene Interaction within GNB3, ACE, ADRB3, ADRB2 among Korean Female Subject)

  • 최현;배현수;홍무창;신현대;신민규
    • 동의생리병리학회지
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    • 제18권5호
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    • pp.1426-1436
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    • 2004
  • There have been several reports on the relationship between G protein β3 subunit gene (GNB3), angiotensin converting enzyme gene (ACE), β3-adrenergic receptor gene (ADRB3), and β2-adrenergic receptor gene (ADRB2) genotype and obesity or obesity related disease. The objective of this study was to examine the relationship between the combinations of these four genes' polymorphism and probability of obesity related disease in Korean female subjects. The experimental group was consisted of 85 obese Korean female subjects (body mass index, BMI≥27㎏/㎡). To determine the polymorphism, genomic DNA was isolated, and PCR was performed. Serological examinations (fasting plasma glucose, FPG; aspartate aminotranferase, AST; alanine aminotransferase, ALT; total cholesterol, TC; triglyceride, TG; high density lipoprotein-cholesterol, HDL; low density lipoprotein-choles terol, LDL) were carried by an autoanalyzer and serological methods. BMI, waist circumference (WC), hip circumference and waist hip ratio (WHR) were measured. Consequencely in the analysis with grouping of general genotyping and variant allele carrier/non-carrier, the result was not significantly different within all gene combinations and polymorphic pairings except higher waist circumference in Arg16Arg group of ADRB2 codon16 (P=0.024). And there was no significantly contrast result about age, height, weight, AST and ALT that are index feature of liver and gall bladder disease in polymorphic pairings of gene combinations. However, the statistical analysis of waist-hip ratio and waist circumference that could be recognized as the physical type of obesity showed T-Arg16 pairing carrier in GNB3-ADRB2 codon16 combination had increased WHR and WC significantly (P=0.046 and P=0.015 respectively). Futhermore, the levels of total cholesterol (TC) and low density lipoprotein choresteral (LDL) were significantly lower in C-I pairing of GNB3-ACE combination (P=0.032 and P=0.005). These results suggest that the T-Arg16 pairing carrier in GNB3-ADRB2 codon16 gene might have increased waist circumference and C-I pairing carrier in GNB3-ACE combination have lower possibility of contraction of cardiovascular disease related cholesterol and LDL despite of obese state.

산사(山査)가 토끼 음경해면체의 수축에 미치는 영향 (Effects of Crataegii fructus on the Contractile Response of Rabbit Corpus Cavernosum)

  • 이한석;박선영
    • 동의생리병리학회지
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    • 제27권5호
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    • pp.602-610
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    • 2013
  • This study was aimed to evaluate the cavernosal relaxation effect of Crataegii fructus(CF) in the contracted rabbit penile corpus cavernosum by agonists.In order to study the effect of CF on the vasoconstriction of rabbit penile corpus cavernosum, isolated rabbit penile corpus cavernosum tissues were used for the experiment using organ baths containing Krebs solution.To investigate the cavernosal relaxation of CF, CF extract at $0.01{\sim}3.0mg/m{\ell}$ was added after penile corpus cavernosum were contracted by norepinephrine(NE) $1{\mu}M$. To analyze the mechanism of CF's vasorelaxation, CF extract infused into contracted penile tissues by NE after each treatment of indomethacin(IM), $N{\omega}$-nitro-L-arginine(L-NNA), methylene blue(MB), tetraethylammonium chloride(TEA).To study the effect of CF on influx of extracellular calcium chloride($Ca^{2+}$) in penile tissues, in $Ca^{2+}$-free krebs solution, $Ca^{2+}$ 1 mM infused into contracted penile tissues by NE after pretreatment of CF. Cytotoxic activity of CF on human umbilical vein endothelial cell(HUVEC) was measured by MTT assay, and nitric oxide(NO) prodution was measured by Griess reagent. CF relaxed cavernosal strip with endothelium contracted by NE, but in the strips without endothelium, CF-induced relaxation was significantly inhibited. The pretreatment of L-NNA, MB, TEA decreased significantly on the cavernosal relaxation than not-treatment of them. But the pretreatment of IM had no significant effect on the cavernosal relaxation. In $Ca^{2+}$-free krebs solution, when $Ca^{2+}$ infused into contracted penile tissues by NE, pretreatment of CF inhibit contraction induced by adding $Ca^{2+}$.NO production wasn't increased by treatment of CF on HUVEC. This findings showed that CF is effective for the relaxation of rabbit penile corpus cavernosum, and we suggest that CF relax rabbit corpus cavernosal smooth muscle through multiple action mechanisms that include increasing the release of nitric oxide from corporal sinusoidal endothelium, inhibition of $Ca^{2+}$ mobilization into cytosol from the extracellular fluid, and maybe a hyperpolarizing action.

카드뮴중독이 흰쥐 정관 및 꼬리동맥의 아드레나린성 ${\alpha}-$수용체에 미치는 영향 (Alteration of ${\alpha}-Adrenoceptor$ by Cd-poisoning in Rat Vas Deferens and Tail Artery)

  • 손방현;조수열;이상일
    • 한국식품영양과학회지
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    • 제14권3호
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    • pp.253-258
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    • 1985
  • 흰쥐 정관 및 꼬리 동맥의 ${\alpha}_1-$${\alpha}_2-$수용체, 그리고 prostaglandine과 관련해 NA 유리에 미치는 Cd의 영향을 관찰하여 다음과 같은 결과를 얻었다. 1. Cd 중독 흰쥐 정관에서 전기 자극에 대한 반응은 증가하였으며, Freq.50은 대조군보다 현저히 낮아졌으며 꼬리동맥의 반응은 감약되었다. 2. Cd 중독 정관에서 clonidine의 억제반응은 유의하게 감소하였으나 methoxamine 존재하의 전기 자극 반응은 영향을 받지 아니하였다. 3. $PGE_2$에 의한 억제작용은 Cd 중독군에서는 소실되었으나 꼬리 동맥에서 $PGE_2$의 억제효과는 Cd 중독으로 영향을 받지 아니하였다. 4. Cd 중독 꼬리 동맥에서 methoxamine 및 clonidine에 대한 수축반응은 최대 수축고가 현저히 낮아졌으나 $ED_{50}$치는 변화하지 아니하였다. 이상의 결과로 보아 Cd 중독시 정관에서 시냅스 전막 autoreceptor가 억제되어 교감 신경 흥분성이 증가함으로써 전기자극에 대한 반응이 항진되었다고 생각된다.

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