Nucleoside diphosphate kinase (Ndk) is ubiquitous and highly conserved multifunctional key enzyme in nucleotide metabolism. It generates nucleoside triphosphates (NTPs) by transfer of gamma-phosphates from nucleoside triphosphates such as ATP or GTP to nucleoside diphosphate. The formation of an autophosphorylated enzyme intermediate is involved in that mechanism. The phosphate is usually supplied by ATP and Ndk activity in different subcellular compartments. Ndk may regulate the crucial balance between ATP and GTP or other nucleoside triphosphates. Ndk is playing an important role in bacterial pathogenesis and emerging evidences recognize multiple roles of Ndk in host-microbe interaction. Here, I review some examples of the role of Ndk in intra- and extracellular microorganism.
Adenosine Triphosphate ; Guanosine Triphosphate ; Nucleoside-Diphosphate Kinase

We cultured the rabbit inner medullary collecting duct (IMCD) cells as monolayers on collagen-coated membrane filters, and investigated distribution of the P2Y receptors by analyzing nucleotide-induced short circuit current (Isc) responses. Exposure to different nucleotides of either the apical or basolateral surface of cell monolayers stimulated Isc. Dose-response relationship and cross-desensitization studies suggested that at least 3 distinct P2Y receptors are expressed asymmetrically on the apical and basolateral membranes. A P2Y2-like receptor, which responds to UTP and ATP, is expressed on both the apical and basolateral membranes. In addition, a uracil nucleotide receptor, which responds to UDP and UTP, but not ATP, is expressed predominantly on the apical membrane. In contrast, a P2Y1-like receptor, which responds to ADP and 2-methylthio-ATP, is expressed predominantly on the basolateral membrane. These nucleotides stimulated intracellular cAMP production with an asymmetrical profile, which was comparable to that in the stimulation of Isc. Our results suggest that the adenine and uracil nucleotides can interact with different P2Y nucleotide receptors that are expressed asymmetrically on the apical and basolateral membranes of the rabbit IMCD cells, and that both cAMP- and Ca2+-dependent signaling mechanisms underlie the stimulation of Isc.
Adenine ; Adenosine Diphosphate ; Adenosine Triphosphate ; Membranes ; Nucleotides ; Uracil ; Uracil Nucleotides ; Uridine Diphosphate ; Uridine Triphosphate

Agenesis of dorsal pancreas (ADP) is an extremely rare congenital anomaly defined as an absence of the dorsal ductal system resulting from failure in the embryologic development of the pancreatic dorsal bud. Most of ADP patients are asymptomatic but some of them suffer recurrent pancreatitis and diabetes. Few number of pancreatic adenocarcinoma in association with ADP has been published previously in other countries. There was no such case reported in Korea. We report a case diagnosed as pancreatic adenocarcinoma with ADP.
Adenocarcinoma* ; Adenosine Diphosphate ; Adult* ; Humans ; Korea ; Pancreas* ; Pancreatic Ducts* ; Pancreatitis

The accessory deep peroneal(ADP) nerve is known as a common anatomical variant. It may alter the usual clinical and electrophysiological charateristics of peroneal nerve lesions. The purpose of the study was to investigate the frequency of occurrence and the electrophysiologic characteristics of the ADP nerve. We performed peroneal motor nerve conduction studies in 434 patiets with conventional method. When the CMAP amplitudes evoked by distal peroneal stimulation is smaller than that by proximal stimulation, we searched ADP nerve by stimulation at posterior to the lateral malleolus. In 60 patients, we searched ADP nerve regardless of CMAP amplitude difference. Additionally, we routinely stimulated the region of posterior to the lateral malleolus with recording at the medial and lateral extensor digitorum brevis(EDB) muscles using multi channel EMG in 34 patients. In conventional peroneal nerve conduction study, ADP nerves were detected in 27(8.2%) patients out of 330 studied patients(right 7, left 15, both 5). Mean amplitue of ADP nerve was 1. 52mV (right 1. 90, left 1. 84). In routine ADP stimulation study, ADP nerve was detected in 5(21.7%) out of 23 patients(left 2, both 3). In 4 of them, the distal peroneal amplitudes were greater than the proximal. Mean amplitude was 1.86mV(right 1.38, left 1.65). In conclusion, we confirmed that the accessary deep peroneal nerve is a relatively common variant and its presence may not be predicted by the difference of amplitudes between the distal and proximal peroneal segments in conventional peroneal nerve conduction study. So in cases of suspected peroneal nerve lesions, ADP nerve should be searched.
Adenosine Diphosphate ; Humans ; Muscles ; Neural Conduction ; Peroneal Nerve*

Ticlopidine hydrochloride is world-wide used antiplatelet agent that inhibit ADP pathway. Its clinical side effects are the change of the blood picture, allergic skin reaction and gastrointestinal symptoms. We report three patients with severe cholestatic hepatitis caused by ticlopidine. They developed jaundice about 20days after taking ticlopidine (500 mg/day). Infectious and immunological etiologies were excluded by serology. There was no history of alcohol or drug abuse. Their symptoms were gradually subsided for a few months after discontinuing ticlopidine.
Adenosine Diphosphate ; Hepatitis* ; Humans ; Jaundice ; Skin ; Substance-Related Disorders ; Ticlopidine

Intestinal absorption liquid was prepared by using everted intestinal sac method; meanwhile, its recipes were decomposed or restructured. Platelet aggregation activity was examined by biochemical tests and a microplate reader. One or more kinds of Chinese medicines which displayed inhibiting activity in Naoxintong Capsules were screened through separation and combination of prescription. The results showed that Naoxintong Capsules could inhibit ADP-induced platelet aggregation. Recipe decomposition and restructuring results showed that Salviae Miltiorrhizae Radix et Rhizoma, Paeoniae Radix Rubra, Cinnamomi Ramulus and Hirudo were the main effective medicines in inhibiting platelet aggregation. Furthermore, Cinnamomi Ramulus played a vital role in inhibiting activity among those four kinds of Chinese medicines. Coumarin derived from intestinal absorption liquid of Cinnamomi Ramulus had inhibiting activity in the range of 50-200 μmol·L⁻¹, and other ingredients such as cinnamyl alcohol and cinnamaldehyde also had inhibiting activities. In conclusion, Salviae Miltiorrhizae Radix et Rhizoma, Paeoniae Radix Rubra, Cinnamomi Ramulus and Hirudo are the main components for inhibiting ADP-induced platelet aggregation, and Cinnamomi Ramulus has the most strongest inhibiting activity in Naoxintong Capsules.
Adenosine Diphosphate ; Capsules ; Drugs, Chinese Herbal ; Intestinal Absorption ; Platelet Aggregation

OBJECTIVE: To evaluate the storage stability of metabolites from actinomycetes Streptomyces nigrogriseolus XD 2-7 and the mollcuscicidal activity against Oncomelania hupensis in the laboratory, and to preliminarily explore the mechanisms of the molluscicidal activity. METHODS: The fermentation supernatant of S. nigrogriseolus XD 2-7 was prepared and stored at -20, 4 °C and 28 °C without light for 10 d; then, the molluscicidal effect was tested against O. hupensis following immersion for 72 h. The fermentation supernatant was boiled in a 100 °C water bath for 30 min and recovered to room temperature, and then the molluscicidal effect was tested against O. hupensis following immersion for 72 h. The pH values of the fermentation supernatant were adjusted to 4.0, 6.0 and 9.0 with concentrated hydrochloric acid and sodium hydroxide, and the fermentation supernatant was stilled at room temperature for 12 h, with its pH adjusted to 7.0; then, the molluscicidal effect was tested against O. hupensis following immersion for 72 h. The fermentation product of S. nigrogriseolus XD 2-7was isolated and purified four times with macroporous resin, silica gel and octadecylsilane bonded silica gel. The final products were prepared into solutions at concentrations of 10.00, 5.00, 2.50, 1.25 mg/L and 0.63 mg/L, and the molluscicidal effect of the final productswas tested against O. hupensis following immersion for 72 h, while dechlorination water served as blank controls, and 0.10 mg/L niclosamide served as positive control. The adenosine triphosphate (ATP) and adenosine diphosphate (ADP) levels were measured in in O. hupensis soft tissues using high performance liquid chromatography (HPLC) following exposure to the final purified fermentation products of S. nigrogriseolus XD 2-7. RESULTS: After the fermentation supernatant of S. nigrogriseolus XD 2-7 was placed at -20, 4 °C and 28 °C without light for 10 d, immersion in the stock solution and solutions at 10- and 50-fold dilutions for 72 h resulted in a 100% (30/30) O. hupensis mortality. Following boiling at 100 °C for 30 min, immersion in the stock solution and solutions at 10- and 50-fold dilutions for 72 h resulted in a 100.00% (30/30) O. hupensis mortality. Following storage at pH values of 4.0 and 6.0 for 12 h, immersion in the fermentation supernatant of S. nigrogriseolus XD 2-7 for 72 h resulted in a 100.00% (30/30) O. hupensis mortality, and following storage at a pH value of 9.0 for 12 h, immersion in the fermentation supernatant of S. nigrogriseolus XD 2-7 for 72 h resulted in a 33.33% (10/30) O. hupensis mortality (χ² = 30.000, P < 0.05). The minimum concentration of the final purified fermentation products of S. nigrogriseolus XD 2-7 was 1.25 mg/L for achieving a 100% (30/30) O. hupensis mortality. The ATP level was significantly lower in O. hupensis soft tissues exposed to 0.10 mg/L and 1.00 mg/L of the final purified fermentation products of S. nigrogriseolus XD 2-7 than in controls (F = 7.274, P < 0.05), while no significant difference was detected in the ADP level between the treatment group and controls (F = 2.485, P > 0.05). CONCLUSIONS The active mollcuscicidal ingredients of the S. nigrogriseolus XD 2-7 metabolites are maintained stably at -20, 4 °C and 28 °C for 10 d, and are heat and acid resistant but not alkali resistant. The metabolites from S. nigrogriseolus XD 2-7 may cause energy metabolism disorders in O. hupensis, leading to O. hupensis death.
Adenosine Diphosphate/pharmacology* ; Adenosine Triphosphate ; Animals ; Molluscacides/pharmacology* ; Silica Gel/pharmacology* ; Snails ; Streptomyces ; Water

BACKGROUND: Nucleoside transport inhibitor(NTI) Keeps AMP, ADP, ATP levels high in myocytes by inhibiting adenosine cataboilsm so that it may preserve the myocardial contractability during ischemia In this study we investigated the effects of cyclic AMP phosphodiesterase inhibor(C-AMP PDSI) and S-P-nitrobenzyl-6 -thioniosine(NBT; a sort of NIT) on myocadial preservation and changes of constituent enzyme. MATERIAL AND METHOD: Twenty-six isolated rabbit hearts were perfused with Krebs-Henseleit buffer solution for 20 minutes arrested for 20 minutes and ten reperfused for 30 minutes. The following four groups were prepared and hemodynamic changes coronary effluent lactate dehydrogenase (LDH) a-hydroxybutylic accid(a-HBD) levels and myocardial LDH creatine kinase-MB (CK-MB) adenosine deaminase(ADA) a-HBD levels and myocardial LDH creatine kinase-MB (CK-MB) adenosine deaminase(ADA) a-HBD levels were analysed before and after cardiac arest ; Group I(control) ; the heart was only perfused with K-H ; Group II ; the heart was perfused with K-H including C-AMP PDSI(Amrinone 25mg/L); Group III ; the heart was perfused with K-H including NBT(4.19mg/L) ; Group IV ; the heart was perfused with K-H including C-AMP PDSI + NBT. RESULT: Left venticular developed pressure(LVDP) at 10 minutes of the equilibrium was significantly higher in group III(72.1+/-5.3 mmHg p<0.01) and group III(72+/-5.6 mmHg P<0.025) as compared with group I (40.8+/-4.7mmHg) and LVDP at 20 minutes of the reperfusion was significantly higher in group II(74+/-5.3mmHg P<0.01) and group III(72+/-5.6mmHg p<0.025) as compared with group I (44.2+/-4.6mmHg). Percentage recovery of LVDP at the reperfusion was the highest in group II(123.3%) Percentage recovery of coronary flow at the equilibrium reperfusion were higher in group II(310%, 270%) group III(230%, 290%) group IV(310%, 280%) as compared with group I (100%) respectively. Myocadial LDH level was significant lower in group IV(33495+/-1802 IU/gm p<0.04) as compared with group I(48767+/-1421 IU/gm) Myocadial CK-MB level was significant higher in group II(74820+/-1421 IU/gm) compared with group I 45450+/-1737 IU/gm) Myocadial ADA level was significant higher group IV(1215+/-8 IU/gm p<0.05) compared with group I(125+/-15 IU/gm) but there was no significant difference between group I and group II ,III, IV in changes of coronary effluent LDH, a-HBD levels. CONCLUSIONS: C-AMP PDSI solely appears to have a better effect on myocardial preservation after ischemia than NBT but with no synergistic effect and it could keep CK-MB leve high in myocardial tissues.
Adenosine ; Adenosine Diphosphate ; Adenosine Triphosphate ; Creatine ; Cyclic AMP ; Heart ; Hemodynamics ; Ischemia ; L-Lactate Dehydrogenase ; Muscle Cells ; Myocardial Ischemia ; Myocardium* ; Reperfusion

It is clear that creatine plays a reservoir of high energy phosphate bond as creatine phosphate and maintains ATP levels in skeletal muscle and nervous tissues. Creatine and creatine kinase activity are required to utilize creatine phosphate as high energy phosphate. The contents of creatine in testis of rats were determined by the method of Van Pilsum and compared with other organs for the study of the physiological role of creatine in testis. Creatine content of tests was 39.82+/-3.36 ug/g wet tissue compared with skeletal muscle, 52.92+/-10.25 ug/g wet tissue. It was relatively high compared with brain (15.45+/-6.49 ug/g wet tissue), heart (20.0+/-2.91 ug/g wet tissue), kidney (29.55+/-2.52 ug/g wet tissue) and liver (12.68+/-1.94 ug/g wet tissue). Creatinine content of testes (45.84+/-4.08 ug/g wet tissue) was very high, compared with skeletal muscle (24.14+/-7.73 ug/g wet tissue), heart .(23.71+/-4.73 ug/g wet tissue), brain (17.24+/-1.19 ug/g wet tissue), kidney (14.92+/-3.45 ug/g set tissue), and liver (9.59 +/-1.26 ug/g wet tissue). I suppose that creatine in testis of rats may be a part of potent system for generation of ATP from ADP hydrolyzing creatine phosphate.
Adenosine Diphosphate ; Adenosine Triphosphate ; Animals ; Brain ; Creatine Kinase ; Creatine* ; Creatinine ; Heart ; Kidney ; Liver ; Muscle, Skeletal ; Phosphocreatine ; Rats* ; Testis

OBJECTIVETo study the role of Ca2+ overload and energy metabolism in mitochondria in masticatory muscle dysfunctional induced by occlusal trauma.

METHODSMitochondrial Ca2+ contents were measured with atomic emission spectrophotometer. Mitochondrial ATP and ADP contents were measured with high performance liquid chromatography.

RESULTS(1) Mitochondrial Ca2+ contents of masseter muscle ipsilateral to metal splint in ten and twenty days' experimental groups and that contralateral to metal splint in twenty days' experimental group increased significantly (P < 0.05). (2) Mitochondrial ATP contents of masseter muscle ipsilateral to metal splint in experimental groups were higher than that in control groups and contralateral to metal splint after twenty days. (3) Mitochondrial Ca2+ contents of masseter muscle ipsilateral to metal splint were significantly negatively correlated to the mitochondrial ATP contents (r = -0.780, P < 0.05).

CONCLUSIONCa2+ overload in mitochondria depresses ATP production, which results in energy metabolism disorder in masticatory muscle cells. It may play an important role in the mechanism that occlusal trauma results in masticatory muscle dysfunction.

Adenosine Diphosphate ; chemistry ; Adenosine Triphosphate ; chemistry ; Animals ; Calcium ; chemistry ; Energy Metabolism ; Masseter Muscle ; chemistry ; injuries ; Mitochondria, Muscle ; chemistry ; Rabbits