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Sousa R, Chung YJ, Rose JP, Wang BC. Crystal structure of bacteriophage T7 RNA polymerase at 3.3 A resolution. Nature 1993; 364:593-9. [PMID: 7688864 DOI: 10.1038/364593a0] [Citation(s) in RCA: 298] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
The crystal structure of T7 RNA polymerase reveals a molecule organized around a cleft that can accommodate a double-stranded DNA template. A portion (approximately 45%) of the molecule displays extensive structural homology to the polymerase domain of Klenow fragment and more limited homology to the human immunodeficiency virus HIV-1 reverse transcriptase. A comparison of the structures and sequences of these polymerases identifies structural elements that may be responsible for discriminating between ribonucleotide and deoxyribonucleotide substrates, and RNA and DNA templates. The relative locations of the catalytic site and a specific promoter recognition residue allow the orientation of the polymerase on the template to be defined.
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Wang BC, Li D. Retrieving an article from erroneous citation. Anesth Analg 1993; 76:671. [PMID: 8452296 DOI: 10.1213/00000539-199303000-00057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
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78
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Wang BC, Li D, Hiller JM, Simon EJ, Budzilovich G, Hillman DE. Lumbar subarachnoid ethylenediaminetetraacetate induces hindlimb tetanic contractions in rats: prevention by CaCl2 pretreatment; observation of spinal nerve root degeneration. Anesth Analg 1992; 75:895-9. [PMID: 1443708 DOI: 10.1213/00000539-199212000-00006] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Disodium ethylenediaminetetraacetate (Na2EDTA) has replaced sodium bisulfite as the antioxidant in 2-chloroprocaine, Nesacaine CE. This study was undertaken to determine whether this new formulation has neurotoxic effects when administered in the subarachnoid space. Sprague-Dawley rats receiving subarachnoid injections of 1.5 mM or higher concentrations of Na2EDTA immediately initiated a circling behavior that was followed by the development of tetanic contractions of the hindlimbs lasting for 15-20 min. The tetanic contractions were followed by a brief period of hindlimb paralysis. Pretreatment of rats by subarachnoid injections of 1 mM CaCl2 prevented the development of tetanic contractions and paralysis of the hindlimb. Histologic examination of animals receiving Na2EDTA revealed moderate to severe focal degenerative changes in spinal nerve roots. Control rats receiving subarachnoid injections of normal saline solution did not develop tetanic contraction nor pathological changes on light microscopy. These results suggest that the preservative used in Nesacaine-MPF may be neurotoxic.
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Wang BC, Hiller JM, Simon EJ, Hillman DE, Rosenberg C, Turndorf H. Distribution of 3H-morphine after lumbar epidural administration in unanesthetized rabbits. REGIONAL ANESTHESIA 1992; 17:334-9. [PMID: 1286055] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
BACKGROUND AND OBJECTIVES This study focused on the distribution of 3H-morphine in the spinal cord, roots, urine, and blood, after epidural administration in rabbits. METHODS Under nitrous oxide, halothane, and oxygen endotracheal anesthesia, the cisterna magna of New Zealand albino rabbits was cannulated for cerebrospinal fluid sampling, and catheters were placed in the lumbar epidural space. Through the epidural catheter, 200 pmol of 3H-morphine contained in 500 microliters of 1.3 mM (0.21 mg) morphine was injected. Arterial blood and cisternal CSF were sampled at 0, 5, 15, 30, 45, 60, 90, and 120 minutes after injection. Animals were killed with intravenous pentobarbital at the end of 120 minutes (n = 3), 6 hours (n = 4), and 12 hours (n = 2). In each animal the brain, spinal cord, spinal roots, liver, kidneys, and urinary bladder were removed. RESULTS The injection site over the cord was identified and all tissues were immediately frozen at -70 degrees C. Two-mm thick cross-sections, were taken from every centimeter of the spinal cord. Radioactivity in the series of sections was determined by scintillation spectroscopy. At 2 hours, 4.2% +/- 1.1% of the injected radioactivity was recovered, and at 6 hours 1.6% +/- 0.6% was recovered. Radioactivity was concentrated mainly around the lumbar injection site, and it decreased as the distance increased from the injection site and coincided with elapsed time after the injection. CONCLUSION Multiple linear regression analysis of radioactive labels showed the significant effect of time, distance from the injection site, and the time-distance interaction on the distribution of 3H-morphine in the spinal cord (p < 0.0001 for time and rostral and caudal distance from the injection site; and p < 0.0001 for interaction between time and distance.) A major portion of the injected radioactivity was recovered in the urine and a small amount in other tissues and body fluid: bladder, liver, spinal roots, kidney, plasma, and cerebrospinal fluid.
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Wang BC, Budzilovich G, Hiller JM, Simon EJ, Hillman DE, Li D, Turndorf H. Are the preservatives sodium bisulfite and ethylene diaminetetraacetate free from neurotoxic involvement? Anesthesiology 1992; 77:602-4. [PMID: 1489414 DOI: 10.1097/00000542-199209000-00034] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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81
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Wang BC, Li Z, Yang DL. [Detection of hepatitis B virus DNA in leucocytes of primary hepatocarcinoma using polymerase chain reaction]. ZHONGHUA NEI KE ZA ZHI 1992; 31:90-2, 126. [PMID: 1327673] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The detection of HBV DNA in sera and leucocytes of 30 primary hepatocarcinoma patients whom were negative for HBsAg by reverse passive hemagglutination using polymerase chain reaction (PCR) were reported. The detectable rates of HBV DNA in leucocytes and sera were 86.7% and 70% respectively and the serological indexes, 43.4%. These indicated that HBV DNA may existent in blood of the patients with negative serological indexes. It was common that HBV DNA presented in peripheral leucocytes of primary hepatocarcinoma, indicated that extrahepatic sites of the HBV genome, and perhaps replication of HBV virus, existed. It was of great importance for the role of HBV DNA in lemology and epidemiology, etiology of hepatocarcinoma, diagnosis and treatment of infection as well as standard of cure.
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Chen P, Rose J, Love R, Wei CH, Wang BC. Reactive sites of an anticarcinogenic Bowman-Birk proteinase inhibitor are similar to other trypsin inhibitors. J Biol Chem 1992; 267:1990-4. [PMID: 1730730 DOI: 10.2210/pdb1pi2/pdb] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
The three-dimensional structure of the Bowman-Birk type proteinase inhibitor (PI-II) has been determined by x-ray crystallography and refined at 2.5-A resolution. This protein is a specific inhibitor of trypsin. Two reactive site loops, one at each end of the PI-II molecule, are structurally similar to each other and to reactive-site loops of pancreatic secretory trypsin inhibitor (Bolognesi, M., Gatti, G., Menegatti, E., Guarneri, M., Marquart, M., Papamokos, E., and Huber, R. (1982) J. Mol. Biol. 162, 839-869) and bovine pancreatic trypsin inhibitor (Deisenhofer, J., and Steigemann, W. (1975) Acta Crystallogr. B31, 238-250). PI-II is the first reported Bowman-Birk type inhibitor structure to be refined at high resolution, providing further insight into inhibitor mechanisms.
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Chen P, Rose J, Love R, Wei CH, Wang BC. Reactive sites of an anticarcinogenic Bowman-Birk proteinase inhibitor are similar to other trypsin inhibitors. J Biol Chem 1992. [DOI: 10.1016/s0021-9258(18)46044-9] [Citation(s) in RCA: 63] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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Arents G, Burlingame RW, Wang BC, Love WE, Moudrianakis EN. The nucleosomal core histone octamer at 3.1 A resolution: a tripartite protein assembly and a left-handed superhelix. Proc Natl Acad Sci U S A 1991; 88:10148-52. [PMID: 1946434 PMCID: PMC52885 DOI: 10.1073/pnas.88.22.10148] [Citation(s) in RCA: 509] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
The structure of the octameric histone core of the nucleosome has been determined by x-ray crystallography to a resolution of 3.1 A. The histone octamer is a tripartite assembly in which a centrally located (H3-H4)2 tetramer is flanked by two H2A-H2B dimers. It has a complex outer surface; depending on the perspective, the structure appears as a wedge or as a flat disk. The disk represents the planar projection of a left-handed proteinaceous superhelix with approximately 28 A pitch. The diameter of the particle is 65 A and the length is 60 A at its maximum and approximately 10 A at its minimum extension; these dimensions are in agreement with those reported earlier by Klug et al. [Klug, A., Rhodes, D., Smith, J., Finch, J. T. & Thomas, J. O. (1980) Nature (London) 287, 509-516]. The folded histone chains are elongated rather than globular and are assembled in a characteristic "handshake" motif. The individual polypeptides share a common central structural element of the helix-loop-helix type, which we name the histone fold.
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Abstract
A bovine neurophysin II S-methyl-Cys-Tyr-Phe-NH2 complex has been crystallized using ammonium sulfate as the precipitating agent. The crystals are orthorhombic, the space group is either I222 or I2(1)2(1)2(1) with a = 124.9 A, b = 69.6 A and c = 151.5 A. The crystals diffract to at least 3.0 A resolution. Based on one neurophysin tetramer per asymmetric unit, the Matthews coefficient is calculated to be 3.92 with a solvent content of 69%.
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86
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Robbins AH, McRee DE, Williamson M, Collett SA, Xuong NH, Furey WF, Wang BC, Stout CD. Refined crystal structure of Cd, Zn metallothionein at 2.0 A resolution. J Mol Biol 1991; 221:1269-93. [PMID: 1942051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The crystal structure of Cd5,Zn2-metallothionein from rat liver has been refined at 2.0 A resolution of a R-value of 0.176 for all observed data. The five Cd positions in the asymmetric unit of the crystal create a pseudo-centrosymmetric constellation about a crystallographic 2-fold axis. Consequently, the distribution of anomalous differences is almost ideally centrosymmetric. Therefore, the previously reported metal positions and the protein model derived therefrom are incorrect. Direct methods were applied to the protein amplitudes to locate the Cd positions. The new positions were used to calculate a new electron density map based on the Cd anomalous scattering and partial structure to model the metal clusters and the protein. Phases calculated from this model predict the positions of three sites in a (NH4)2WS4 derivative. Single isomorphous replacement phases calculated with these tungsten sites confirm the positions of the Cd sites from the new direct methods calculations. The refined metallothionein structure has a root-mean-square deviation of 0.016 A from ideality of bonds and normal stereochemistry of phi, phi and chi torsion angles. The metallothionein crystal structure is in agreement with the structures for the alpha and beta domains in solution derived by nuclear magnetic resonance methods. The overall chain folds and all metal to cysteine bonds are the same in the two structure determinations. The handedness of a short helix in the alpha-domain (residues 41 to 45) is the same in both structures. The crystal structure provides information concerning the metal cluster geometry and cysteine solvent accessibility and side-chain stereochemistry. Short cysteine peptide sequences repeated in the structure adopt restricted conformations which favor the formation of amide to sulfur hydrogen bonds. The crystal packing reveals intimate association of molecules about the diagonal 2-fold axes and trapped ions of crystallization (modeled as phosphate and sodium). Variation in the chemical and structural environments of the metal sites is in accord with data for metal exchange reactions in metallothioneins.
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Fu JH, Rose J, Chung YJ, Tam MF, Wang BC. Crystals of isoenzyme 3-3 of rat liver glutathione S-transferase with and without inhibitor. ACTA CRYSTALLOGRAPHICA SECTION B: STRUCTURAL SCIENCE 1991; 47 ( Pt 5):813-4. [PMID: 1793546 DOI: 10.1107/s0108768191006584] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The isoenzyme 3-3 of rat liver glutathione S-transferase (GST 3-3) isolated from a baculovirus expression system has been crystallized with and without inhibitor. The crystals grown in the absence of an inhibitor belong to space group P2(1) with cell dimensions a = 119.7, b = 96.2, c = 136.7 A and beta = 103.3 degrees, and diffract to 3 A resolution. The crystals grown in the presence of an inhibitor belong to space group C2 with cell dimensions a = 88.3, b = 69.7, c = 81.4 A and beta = 105.3 degrees, and diffract to at least 2.5 A resolution. The inhibitor used is either methylmercury chloride or ethylmercury chloride; both are weak inhibitors.
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Rose JP, Breslow E, Huang HB, Wang BC. Crystallographic analysis of the neurophysin-oxytocin complex. A preliminary report. J Mol Biol 1991; 221:43-5. [PMID: 1920416 DOI: 10.1016/0022-2836(91)80201-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Single crystals of a bovine neurophysin II-oxytocin complex have been obtained using (NH4)2SO4 as the precipitating agent. The crystals diffract to at least 2.7 A resolution, belong to Laue group 4/mmm and exhibit systematic absences consistent with either space group P4(1)2(1)2 or P4(3)2(1)2. The cell dimensions are a = b = 69.07 A and c = 113.26 A. The crystals contain one neurophysin-oxytocin dimer per asymmetric unit. Based on a Vm of 2.9 A3/Da, the solvent content is calculated to be 58%. Chromatographic analysis of the dissolved crystals suggests the presence of three oxytocin molecules per neurophysin dimer.
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Chen CJ, Rose J, Hsiao CD, Lee TJ, Wu WG, Wang BC. Preliminary crystallographic analysis of cardiotoxin V with major fusion activity from Taiwan cobra (Naja naja atra) venom. J Mol Biol 1991; 219:591-2. [PMID: 2056526 DOI: 10.1016/0022-2836(91)90653-n] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Crystals of a cardiotoxin from Taiwan cobra venom have been obtained by the vapor diffusion method using methyl pentanediol as precipitant. The crystals belong to the hexagonal space group P6(1)22 (or P6(5)22), with cell dimensions a = b = 47.5 A, c = 111.3 A, alpha = beta = 90 degrees and gamma = 120 degrees and diffract to a resolution of 2.2 A. There is one molecule per asymmetric unit and the solvent content is estimated to be 53%.
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Wang BC, Kennan WS, Yasukawa-Barnes J, Lindstrom MJ, Gould MN. Carcinoma induction following direct in situ transfer of v-Ha-ras into rat mammary epithelial cells using replication-defective retrovirus vectors. Cancer Res 1991; 51:2642-8. [PMID: 2021942] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Chemically induced mammary carcinomas often contain the activated Ha-ras oncogene. The role of this oncogene in the multistage process of carcinogenesis remains undefined. In order to model the role of ras in mammary carcinogenesis, gene transfer into adult rat mammary epithelial cells was accomplished by infusing helper-free, replication-defective retrovirus vectors into the central duct of each gland. In the initial experiments, the beta-galactosidase reporter gene was used to optimize the efficiency of this in situ gene transfer method. Stable infection of greater than 0.1% of mammary cells could be achieved following exposure to the beta-galactosidase gene-expressing vector. v-Ha-ras was then introduced into in situ adult rat mammary epithelial cells using this method. Cellular infection frequencies of less than 1% resulted in the frequent and rapid appearance of mammary carcinomas without any further treatment. Tumors arising following v-Ha-ras oncogene transfer resembled those induced by chemical carcinogens in both the kinetics of their development and histopathological spectrum. These observations support the hypothesis that ras activation can act as an initiation event in chemically induced mammary carcinogenesis. However, only a small percentage of v-Ha-ras infected cells, even with hormonal promotion, were neoplastically transformed, suggesting that ras-driven transformation is not a one-step event.
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Chen LQ, Rose JP, Breslow E, Yang D, Chang WR, Furey WF, Sax M, Wang BC. Crystal structure of a bovine neurophysin II dipeptide complex at 2.8 A determined from the single-wavelength anomalous scattering signal of an incorporated iodine atom. Proc Natl Acad Sci U S A 1991; 88:4240-4. [PMID: 2034668 PMCID: PMC51634 DOI: 10.1073/pnas.88.10.4240] [Citation(s) in RCA: 106] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
The crystal structure of a dipeptide complex of bovine neurophysin II has been solved at 2.8 A resolution solely by using single-wavelength anomalous scattering data from a single iodinated derivative. The asymmetric unit is an elongated tetramer of dimensions 110 x 40 x 30 A, composed of two dimers related by pseudo twofold symmetry. Each monomer consists of two homologous layers, each with four antiparallel beta-strands. The two regions are connected by a helix followed by a long loop. Monomer-monomer contacts involve antiparallel beta-sheet interactions, which form a dimer with two layers of eight beta-strands. One peptide per monomer occupies the principal hormone-binding pocket formed by part of the amino-terminal region and parts of the connecting helix and loop, with binding to protein consistent with conclusions drawn from solution studies. Dimer-dimer contacts involve the Tyr49 region adjacent to this site. A fifth dipeptide, of unknown biological significance, helps to stabilize one of the monomer-monomer interfaces and the tetramer-tetramer network in the crystal.
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Abstract
An animal model was developed for the study of subarachnoid (spinal) anesthesia and analgesia under unanesthetized, unsedated and unrestrained conditions. Sprague-Dawley rats were anesthetized with intraperitoneal ketamine (75-100 mg.kg-1). A PE10 catheter was inserted under direct vision into the lumbar subarachnoid space, through partial laminectomy of L1 or L2 with or without removal of adjacent intervertebral ligament. One week after surgery, correct position of the catheter was verified by subarachnoid injection of 0.03-0.05 ml of 1.5% lidocaine, which produced temporary hind limb paralysis in all but one animal in 28 consecutive operations. There was neither mortality nor major complication, intraoperatively or postoperatively. Only 2 animals developed minor subcutaneous would infections which responded to incision, drainage and debridement.
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Sousa R, Chung YJ, McAllister WT, Wang BC, Lafer EM. Single crystals of a chimeric T7/T3 RNA polymerase with T3 promoter specificity and a nonprocessive T7 RNAP mutant. J Biol Chem 1990; 265:21430-2. [PMID: 2254305] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Two RNA polymerases homologous to bacteriophage T7 RNA polymerase, bacteriophage Sp6 and T3 RNA polymerases, were screened for crystallization under conditions identical or similar to those reported for the growth of large single crystals of T7 RNA polymerase (Sousa, R., Rose, J. P., Chung, Y. J., Lafer, E. M., and Wang, B.-C. (1989) Proteins 5, 266; Sousa, R., Lafer, E. M., and Wang, B.-C. (1990) J. Crystal Growth, in press; Sousa, R., and Lafer, E. M. (1990) Methods 1, in press). A number of mutant T7 RNAPs were also screened under these conditions as were three chimeric RNA polymerases consisting of T7 RNAP N-terminal and T3 RNAP C-terminal sequences. One chimeric polymerase and two mutant polymerases crystallized readily under T7 RNAP crystallization conditions. The chimeric polymerase crystallized in a space group different from T7 RNA polymerase: orthorombic with unit cell parameters a = 75 A, b = 98 A, c = 159 A; space group P2(1)2(1)2(1) and 4 molecules/unit cell. This chimeric enzyme exhibits T3 promoter specificity and will make it possible to investigate how structural differences between the T3 and T7 RNA polymerase promoter recognition domains determine their different promoter specificities. One of the mutant polymerases successfully crystallized was an enzyme which can carry out promoter recognition and abortive transcription but cannot carry out processive transcription. Its structure may provide information on the nature of the conformational changes undergone by T7 RNAP in the abortive-processive switch. Crystals of the second mutant T7 RNA polymerase were unsuitable for x-ray analysis.
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Bie P, Wang BC, Leadley RJ, Goetz KL. Enhanced atrial peptide natriuresis during angiotensin and aldosterone blockade in dogs. THE AMERICAN JOURNAL OF PHYSIOLOGY 1990; 258:R1101-7. [PMID: 2140023 DOI: 10.1152/ajpregu.1990.258.5.r1101] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The hypothesis that the weak natriuretic effect elicited by modest amounts of atrial peptide is mediated via the inhibition of renin and aldosterone was evaluated in the conscious dog. The formation of angiotensin II (ANG II) and the effects of aldosterone (Aldo) were blocked acutely by enalaprilat and canrenoate, respectively. Infusion of alpha-human atrial natriuretic peptide (alpha-hANP) for 2 h at 25 ng.kg-1.min-1 increased plasma atrial peptide concentration 7- to 10-fold. In control experiments, i.e., experiments without ANG II-Aldo blockade, infusion of atrial peptide doubled urine volume (UV) from 0.21 +/- 0.01 to 0.43 +/- 0.09 ml/min and sodium excretion (UNaV) from 18 +/- 5 to 37 +/- 7 mueq/min; mean arterial blood pressure (AP) and atrial pressures decreased, whereas total peripheral resistance increased. The induction of ANG II-Aldo blockade elevated UNaV and UV 10- and 6-fold, respectively, and decreased AP. The subsequent 2-h infusion of atrial peptide elicited a further increase in UNaV (from 195 +/- 28 to 334 +/- 60 mueq/min); the hemodynamic changes were similar to those seen in the absence of ANG II-Aldo blockade, except that AP did not decrease significantly during the administration of atrial peptide. The data demonstrate that pharmacological inhibition of the effects of converting enzyme and Aldo does not impede the natriuretic response elicited by a 7- to 10-fold increase in circulating atrial peptide; in fact, the magnitude of the natriuresis is markedly enhanced during this blockade.
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Wang BC, Hiller JM, Simon EJ, Hillman DE, Li D, Rosenberg C, Turndorf H. Selection of vehicle for epidural meperidine influences nociceptive latency in rabbits. Can J Anaesth 1990; 37:S47. [PMID: 2361294] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
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Madwed JB, Wang BC. Pentobarbital anesthesia alters renal actions of alpha-hANP in dogs. THE AMERICAN JOURNAL OF PHYSIOLOGY 1990; 258:R616-23. [PMID: 2138425 DOI: 10.1152/ajpregu.1990.258.3.r616] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The magnitude of the natriuretic response to an infusion of alpha-human atrial natriuretic peptide (alpha-hANP) has varied considerably in different studies. The greatest renal responses to alpha-hANP infusion have been observed in barbiturate-anesthetized dogs. We therefore examined the renal, hormonal, and cardiovascular responses to alpha-hANP infusion in eight female dogs, once awake and again anesthetized with pentobarbital sodium (25 mg/kg body wt). After a 20-min control period, alpha-hANP was infused at a rate of 25 ng.kg-1.min-1 for 60 min. In dogs when awake, infusion of alpha-hANP produced a significant increase in sodium excretion from a control value of 39 +/- 7 to 73 +/- 13 and 89 +/- 15 mu eq/min after 40 and 60 min. In dogs when anesthetized, infusion of alpha-hANP produced an increase in sodium excretion from 21 +/- 3 to 105 +/- 12 and 143 +/- 21 mu eq/min after 40 and 60 min. The increase in sodium excretion was significantly greater in dogs when anesthetized than when awake. We also investigated the role of the renal sympathetic nerves on these responses in six dogs after chronic bilateral renal denervation. In dogs with denervated kidneys when awake, infusion of alpha-hANP did not change sodium excretion significantly. In dogs with denervated kidneys when anesthetized, infusion of alpha-hANP significantly increased sodium excretion; however, the increase was significantly attenuated when compared with anesthetized dogs with intact kidneys. We conclude that the natriuretic response to an infusion of alpha-hANP is enhanced in dogs when anesthetized. Also, the natriuretic response was attenuated by renal denervation in dogs when anesthetized.
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Wang BC, Leadley RJ, Goetz KL. Atriopeptin alters the vasopressin and renin responses elicited by hemorrhage. PROCEEDINGS OF THE SOCIETY FOR EXPERIMENTAL BIOLOGY AND MEDICINE. SOCIETY FOR EXPERIMENTAL BIOLOGY AND MEDICINE (NEW YORK, N.Y.) 1990; 193:85-91. [PMID: 2137250 DOI: 10.3181/00379727-193-43007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
This study was designed to investigate whether an infusion of atrial peptide is capable of modulating the hormonal and hemodynamic responses elicited by acute hemorrhage. Conscious dogs were bled at a rate of 0.8 ml.kg-1.min-1 until 20 ml of blood/kg body wt had been removed. Two experiments were performed on each dog; in one experiment the animal was given alpha-human atrial natriuretic peptide (alpha-hANP) (50 ng.kg-1.min-1) dissolved in saline; in the other only the saline vehicle was given. Right and left atrial pressures decreased during hemorrhage in all experiments; the absolute decreases were greater when the animals received atriopeptin, but the differences between treatments were statistically significant only for right atrial pressure. Cardiac output decreased (P less than 0.05) and total peripheral resistance increased (P less than 0.05) during hemorrhage when atriopeptin was infused; although these variables showed similar trends when vehicle alone was infused during hemorrhage, no significant changes occurred. Infusion of atrial peptide did not affect the decrease in arterial blood pressure that occurred during hemorrhage. The increase in plasma vasopressin induced by hemorrhage was potentiated, but the increase in plasma renin activity was attenuated when alpha-hANP was infused. Hemorrhage increased circulating aldosterone levels in each experiment, but the response was less pronounced when alpha-hANP was given during the experiment. Intravenous administration of alpha-hANP modulates the hemodynamic responses elicited by hemorrhage, potentiates the rise in plasma vasopressin, and attenuates the rise in plasma renin activity induced by acute blood loss in conscious dogs.
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Hempel J, Rose JP, Kuo I, Lindahl R, Wang BC. Rat class 3 aldehyde dehydrogenase: crystals and preliminary analysis. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 1990; 284:9-11. [PMID: 2053495 DOI: 10.1007/978-1-4684-5901-2_2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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Zhu JL, Leadley RJ, Geer PG, Wang BC, Goetz KL. Norepinephrine-induced atriopeptin release in conscious dogs is mediated by alterations in atrial pressure. Life Sci 1990; 46:139-45. [PMID: 2137190 DOI: 10.1016/0024-3205(90)90046-t] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
This study was designed to determine whether the increase in atriopeptin secretion induced by an intravenous infusion of norepinephrine is mediated directly by adrenergic receptor stimulation or indirectly by the associated increase in atrial pressure. Norepinephrine was infused at 0.5 microgram.kg-1.min-1 for 30 min into both sham-operated (intact) and cardiac-denervated conscious dogs. The infusion increased mean arterial pressure in all dogs. On the other hand, left atrial pressure increased from 5.0 +/- 0.7 to 9.6 +/- 1.6 mmHg (p less than 0.01) in intact dogs, but decreased from 5.5 +/- 1.0 to 2.0 +/- 0.7 (p less than 0.01) in cardiac-denervated dogs. Right atrial pressure changes followed similar trends, but were not significant in the intact group. Plasma atriopeptin increased from 73 +/- 12 to 110 +/- 18 pg/ml (p less than 0.01) as left atrial pressure increased in intact dogs and decreased from 79 +/- 15 to 54 +/- 10 pg/ml (p less than 0.01) as left atrial pressure decreased in cardiac-denervated dogs. The changes in plasma atriopeptin correlated closely with the changes in left atrial pressure (r = 0.941, p less than 0.001) and to a lesser extent with the changes in right atrial pressure (r = 0.413, p less than 0.05). These results suggest that the change in plasma atriopeptin induced by infusion of norepinephrine into conscious dogs is mediated by the concomitant change in atrial pressures.
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Rose JP, Hempel J, Kuo I, Lindahl R, Wang BC. Preliminary crystallographic analysis of class 3 rat liver aldehyde dehydrogenase. Proteins 1990; 8:305-8. [PMID: 2091023 DOI: 10.1002/prot.340080404] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
NAD-linked aldehyde dehydrogenases (A1DH) (EC 1.2.1.3) catalyze the irreversible oxidation of a wide variety of aldehydes to their respective carboxylic acids. Crystals of a class 3 AIDH (from an Escherichia coli expression system) suitable for X-ray analysis have been obtained. These crystals, which can be grown to a size of 0.8 x 0.3 x 0.2 mm, diffract to 2.5 A resolution. Analysis of the diffraction pattern indicates that the crystals belong to the monoclinic space group P21, with cell parameters a = 65.11 A, b = 170.67 A, c = 47.15 A, and beta = 110.5 degrees. Assuming one dimer per asymmetric unit, the value Vm is calculated to be 2.45 and the solvent content of the crystal is estimated to be 50%. A self-rotation function study produced significant rotation peaks (58% of the origin) on the kappa = 180 section at psi = 90 degrees and phi = 71 degrees and 341 degrees, indicating that the pseudo-dimer axis is (or is very nearly) perpendicular to the b-axis.
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