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Akentjew TL, Terraza C, Suazo C, Maksimcuka J, Wilkens CA, Vargas F, Zavala G, Ocaña M, Enrione J, García-Herrera CM, Valenzuela LM, Blaker JJ, Khoury M, Acevedo JP. Author Correction: Rapid fabrication of reinforced and cell-laden vascular grafts structurally inspired by human coronary arteries. Nat Commun 2019; 10:3508. [PMID: 31366976 PMCID: PMC6668386 DOI: 10.1038/s41467-019-11446-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
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Akentjew TL, Terraza C, Suazo C, Maksimcuka J, Wilkens CA, Vargas F, Zavala G, Ocaña M, Enrione J, García-Herrera CM, Valenzuela LM, Blaker JJ, Khoury M, Acevedo JP. Rapid fabrication of reinforced and cell-laden vascular grafts structurally inspired by human coronary arteries. Nat Commun 2019; 10:3098. [PMID: 31308369 PMCID: PMC6629634 DOI: 10.1038/s41467-019-11090-3] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2017] [Accepted: 06/20/2019] [Indexed: 12/19/2022] Open
Abstract
Design strategies for small diameter vascular grafts are converging toward native-inspired tissue engineered grafts. A new automated technology is presented that combines a dip-spinning methodology for depositioning concentric cell-laden hydrogel layers, with an adapted solution blow spinning (SBS) device for intercalated placement of aligned reinforcement nanofibres. This additive manufacture approach allows the assembly of bio-inspired structural configurations of concentric cell patterns with fibres at specific angles and wavy arrangements. The middle and outer layers were tuned to structurally mimic the media and adventitia layers of native arteries, enabling the fabrication of small bore grafts that exhibit the J-shape mechanical response and compliance of human coronary arteries. This scalable automated system can fabricate cellularized multilayer grafts within 30 min. Grafts were evaluated by hemocompatibility studies and a preliminary in vivo carotid rabbit model. The dip-spinning-SBS technology generates constructs with native mechanical properties and cell-derived biological activities, critical for clinical bypass applications.
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Ocaña M. Preparation and properties of uniform praseodymium-doped ceria colloidal particles. Colloid Polym Sci 2014. [DOI: 10.1007/s00396-001-0607-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Colodrero S, Ocaña M, González-Elipe AR, Míguez H. Response of nanoparticle-based one-dimensional photonic crystals to ambient vapor pressure. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:9135-9139. [PMID: 18630935 DOI: 10.1021/la801210q] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Herein we report an analysis of the variation of the optical properties of different nanoparticle-based one-dimensional photonic crystal architectures versus changes in the ambient vapor pressure. Gradual shift of the optical response provides us with information on the sorption properties of these structures and allow us to measure precise adsorption isotherms of these porous multilayers. The potential of nanoparticle-based one-dimensional photonic crystals as base materials for optical sensing devices is demonstrated in this way.
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Miró J, Flotats A, Rivera MM, Ocaña M, Taberner E, Peña A, Rigau T. OC3 Morphometry Characterisation of Catalan Donkey Spermatozoa and Identification of Sperm Morphometric Subpopulations. Reprod Domest Anim 2006. [DOI: 10.1111/j.1439-0531.2006.00774_1_3.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Morales M, González-Carreño T, Ocaña M, Alonso-Sañudo M, Serna C. Magnetic Iron Oxide/Mullite Nanocomposite Stable up to 1400°C. J SOLID STATE CHEM 2000. [DOI: 10.1006/jssc.2000.8995] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Ocaña M. Preparation and Characterization of Uniform Needle-like Particles of Nickel Basic Sulfate. J Colloid Interface Sci 2000; 228:259-262. [PMID: 10926464 DOI: 10.1006/jcis.2000.6950] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Needle-like particles (maximum length, approximately 2 µm) of nickel basic sulfate (Ni(OH)(1.4)(SO(4))(0.3)) were prepared by forced hydrolysis at 100 degrees C for 2 days of aqueous solutions containing nickel(II) nitrate, nickel(II) sulfate, and sodium acetate in the appropriated concentrations. The needles were characterized in terms of their composition, crystal structure, and electrokinetic behavior. Their structural and compositional evolutions with temperature were also studied. It was found that a dehydroxylation process took place on heating at 500 degrees C after which the particles consisted of a mixture of crystalline NiO and an amorphous nickel sulfate. This compound decomposed at a higher temperature (800 degrees C) yielding NiO. The particles lost the needle-like shape after calcination at 500 degrees C. Copyright 2000 Academic Press.
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Ocaña M. Uniform particles of manganese compounds obtained by forced hydrolysis of manganese(II) acetate. Colloid Polym Sci 2000. [DOI: 10.1007/s003960050537] [Citation(s) in RCA: 71] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Ocaña M, Morales MP, Serna CJ. Homogeneous Precipitation of Uniform alpha-Fe2O3 Particles from Iron Salts Solutions in the Presence of Urea. J Colloid Interface Sci 1999; 212:317-323. [PMID: 10092361 DOI: 10.1006/jcis.1998.6042] [Citation(s) in RCA: 88] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Uniform alpha-Fe2O3 particles within the nanometer range (100-300 nm) have been obtained by precipitation of iron (III) perchlorate in the presence of urea. Different morphology, from spheres to ellipsoidal particles with axial ratio up to approximately 10, was obtained by adding to the initial solution increasing amounts of phosphate anions up to 7 x 10(-3) M. The main targets of this work are the reduction in particle size and precipitation time and the increase of the particles axial ratio, keeping a narrow particle size distribution, in comparison to other methods previously developed to obtain homogenous alpha-Fe2O3 particles. A detailed analysis of the reaction products and a systematic study of the influence of the different precipitation conditions on the characteristics of the resulting particles have been carried out. Finally, some information on the formation mechanism of the ellipsoidal hematite particles in the iron (III) salt-urea-phosphate system is also given. Copyright 1999 Academic Press.
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Wells CD, Ocaña M, Moser K, Bergmire-Sweat D, Mohle-Boetani JC, Binkin NJ. A study of tuberculosis among foreign-born Hispanic persons in the U.S. States bordering Mexico. Am J Respir Crit Care Med 1999; 159:834-7. [PMID: 10051259 DOI: 10.1164/ajrccm.159.3.9712122] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
In 1996, 10% of the 20,973 U.S. tuberculosis (TB) cases were among foreign-born (FB) Hispanic persons, with the four states bordering Mexico accounting for 83% of FBH cases. Limited information is available on this population's health care seeking and migration practices and on differences between FB Hispanic patients in border and nonborder areas. Therefore, we conducted interviews and record reviews for all consenting FB Hispanic TB patients from eight counties bordering Mexico (BC; n = 167) and seven urban nonborder counties (NBC; n = 158) in these States during 1995-1997. BC patients had resided in the U.S. longer than NBC patients (17.4 versus 10.8 yr; p < 0.01), had immigrated more often from Mexican border communities (62.4% versus 25.4%; p < 0.01), and had returned to Mexico more often in the past 12 mo (71.5% versus 47.3%; p < 0. 01). TB symptoms were present for >/= 6 mo in 37% of BC and 34% of NBC patients. Binational collaboration is essential for improving TB control in both countries and should extend beyond border areas of Mexico.
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Stachen M, Morales MP, Ocaña M, Serna CJ. Effect of precursor impurities on the magnetic properties of uniform γ-Fe2O3 ellipsoidal particles. Phys Chem Chem Phys 1999. [DOI: 10.1039/a904606b] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Ocaña M, Caballero A, González-Elı́pe A, Tartaj P, Serna C. Valence and Localization of Praseodymium in Pr-Doped Zircon. J SOLID STATE CHEM 1998. [DOI: 10.1006/jssc.1998.7875] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Ferreyra M, Cervantes R, Ocaña M. [Criteria for pharmacologic quality in artificial nutritional support applied in Peru]. REVISTA DE GASTROENTEROLOGIA DEL PERU : ORGANO OFICIAL DE LA SOCIEDAD DE GASTROENTEROLOGIA DEL PERU 1996; 16:106-24. [PMID: 8924650] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
This is a report on the metabolic consequences derived from widely using a parenteral nutrition scheme in Peru. That scheme was in disagreement with internationally accepted principles. Its lack of capacity to achieve anabolism is demonstrated. Enteral and parenteral nutrition schemes that clearly achieve anabolism are shown as well as the notorious contrast with the parenteral nutrition scheme referred to previously. These facts set up the basis of the Formulary of Nutritional Support Units of Instituto Peruano de Seguridad Social.
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Ocaña M, Barrios M, Baeyens JM. Cromakalim differentially enhances antinociception induced by agonists of alpha(2)adrenoceptors, gamma-aminobutyric acid(B), mu and kappa opioid receptors. J Pharmacol Exp Ther 1996; 276:1136-42. [PMID: 8786544] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
The influence of the ATP-sensitive K+(KATP) channel opener cromakalim on the antinociception induced by agonists of several receptors coupled to pertussis toxin-sensitive G proteins, clonidine (alpha2 adrenoceptor), baclofen (gamma-aminobutyric acid(B) receptor), morphine (mu opioid receptor) and U50,488H (kappa opioid receptor), was evaluated with a tail-flick test in mice. The subcutaneous administration of clonidine (0.12-2 mg/kg), morphine (0.5-16 mg/kg), baclofen (2-16 mg/kg) and U50,488H (2-16 mg/kg) induced a dose-dependent antinociceptive effect. Cromakalim (8-64 microgram/mouse intracerebroventricularly [i.c.v.]) did not change tail-flick latency in control animals but produced a dose-dependent enhancement of the antinociception induced by clonidine and morphine, and shifted their dose-response curves to the left. These effects of cromakalim were antagonized dose dependently by the K(ATP) channel blocker gliquidone (0.1-8 microgram/mouse i.c.v.). On the other hand, cromakalim (16-64 microgram/mouse i.c.v.) did not significantly enhance the antinociception induced by baclofen and U50,488H and did not shift their dose-response curves. These results suggest that opening of the K(ATP) channels plays an important role in the antinociception mediated by alpha(2) adrenoceptors and mu opioid receptors, but not in that induced by gamma-aminobutyric acid(B) and kappa opioid receptors.
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Ocaña M, Del Pozo E, Barrios M, Baeyens JM. Subgroups among mu-opioid receptor agonists distinguished by ATP-sensitive K+ channel-acting drugs. Br J Pharmacol 1995; 114:1296-302. [PMID: 7620721 PMCID: PMC1510369 DOI: 10.1111/j.1476-5381.1995.tb13346.x] [Citation(s) in RCA: 71] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
1. We evaluated the effects of the i.c.v. administration of different K+ channel blockers (gliquidone, 4-aminopyridine and tetraethylammonium) and an opener of K+ channels (cromakalim) on the antinociception induced by several mu-opioid receptor agonists in a tail flick test in mice. 2. The s.c. administration of all agonists of mu-opioid receptors tested (morphine, 1-16 mg kg-1; metadone, 1-6 mg kg-1; buprenorphine, 0.04-0.64 mg kg-1; fentanyl, 0.02-0.32 mg kg-1 and levorphanol, 0.2-3.2 mg kg-1) elicited a dose-dependent antinociceptive effect. 3. The ATP-sensitive K+ channel blocker, gliquidone (0.06-16 micrograms per mouse, i.c.v.) antagonized the antinociception induced by buprenorphine, morphine and metadone. In contrast, gliquidone (0.25-160 micrograms per mouse) did not modify the antinociceptive effects of fentanyl and levorphanol. 4. Cromakalim (4-64 micrograms per mouse, i.c.v.), an opener of ATP-sensitive K+ channels, enhanced the antinociception produced by buprenorphine, morphine, and methadone, and did not significantly modify the antinociceptive effects of fentanyl and levorphanol. 5. The i.c.v. administration of the K+ channel blockers tetraethylammonium (10 micrograms per mouse) or 4-aminopyridine (25 ng per mouse) did not significantly modify the antinociception induced by any mu-opioid receptor agonist tested. 6. These results suggest that the opening of ATP-sensitive K+ channels is involved in the antinociceptive effect of morphine, buprenorphine and methadone, but not in that of fentanyl or levorphanol. Consequently, we suggest that at least two subgroups can be distinguished among mu-opioid receptor agonists, each inducing antinociception through different effector mechanisms.
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Ocaña M, Baeyens JM. Role of ATP-sensitive K+ channels in antinociception induced by R-PIA, an adenosine A1 receptor agonist. NAUNYN-SCHMIEDEBERG'S ARCHIVES OF PHARMACOLOGY 1994; 350:57-62. [PMID: 7935855 DOI: 10.1007/bf00180011] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The influence of several K+ channel-acting drugs on antinociception induced by the adenosine A1 receptor agonist (-)-N6-(2-phenylisopropyl)-adenosine (R-PIA) was evaluated with a tail flick test in mice. The subcutaneous administration of R-PIA (0.5-8 mg/kg) induced a dose-dependent antinociceptive effect. The ATP-sensitive K+ (KATP) channel blocker gliquidone (2-8 micrograms/mouse, i.c.v.) produced a dose-dependent displacement to the right of the R-PIA dose-response line, whereas the KATP channel opener cromakalim (32 micrograms/mouse, i.c.v.) shifted it to the left. Several KATP channel blockers dose-dependently antagonized the antinociceptive effect of R-PIA, the order of potency being gliquidone > glipizide > glibenclamide (i.e., the same order of potency shown by these drugs in blocking KATP channels in neurons). In contrast, the K+ channel blockers 4-aminopyridine and tetraethylammonium did not antagonize the effect of R-PIA. These data suggest that antinociception produced by adenosine A1 receptor agonists is mediated by the opening of ATP-sensitive K+ channels. The present results, together with those of previous studies, further support a role for K+ channel opening in the antinociceptive effect of agonists of receptors coupled to Gi/Go proteins.
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Ocaña M, Andres M, Serna C. Spherical HfO2 particles obtained by hydrolysis of hafnium tert-butoxide. Colloids Surf A Physicochem Eng Asp 1993. [DOI: 10.1016/0927-7757(93)80172-b] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Ocaña M, Baeyens JM. Differential effects of K+ channel blockers on antinociception induced by alpha 2-adrenoceptor, GABAB and kappa-opioid receptor agonists. Br J Pharmacol 1993; 110:1049-54. [PMID: 7905339 PMCID: PMC2175792 DOI: 10.1111/j.1476-5381.1993.tb13919.x] [Citation(s) in RCA: 51] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
1. The effects of several K+ channel blockers (sulphonylureas, 4-aminopyridine and tetraethylammonium) on the antinociception induced by clonidine, baclofen and U50,488H were evaluated by use of a tail flick test in mice. 2. Clonidine (0.125-2 mg kg-1, s.c.) induced a dose-dependent antinociceptive effect. The ATP-dependent K+ (KATP) channel blocker gliquidone (4-8 micrograms/mouse, i.c.v.) produced a dose-dependent displacement to the right of the clonidine dose-response line, but neither 4-aminopyridine (4-AP) (25-250 ng/mouse, i.c.v.) nor tetraethylammonium (TEA) (10-20 micrograms/mouse, i.c.v.) significantly modified clonidine-induced antinociception. 3. The order of potency of sulphonylureas in antagonizing clonidine-induced antinociception was gliquidone > glipizide > glibenclamide > tolbutamide, which is the same order of potency as these drugs block KATP channels in neurones of the CNS. 4. Baclofen (2-16 mg kg-1, s.c.) also induced a dose-dependent antinociceptive effect. Both 4-AP (2.5-25 ng/mouse, i.c.v.) and TEA (10-20 micrograms/mouse, i.c.v.) dose-dependently antagonized baclofen antinociception, producing a displacement to the right of the baclofen dose-response line. However, gliquidone (8-16 micrograms/mouse, i.c.v.) did not significantly modify the baclofen effect. 5. None of the K+ channel blockers tested (gliquidone, 8-16 micrograms/mouse; 4-AP, 25-250 ng/mouse and TEA, 10-20 micrograms/mouse, i.c.v.), significantly modified the antinociception induced by U50,488H (8 mg kg-1, s.c.). 6. These results suggest that the opening of K+ channels is involved in the antinociceptive effect of alpha 2 and GABAB, but not kappa-opioid, receptor agonists. The K+ channels opened by alpha2-adrenoceptor agonists seem to be ATP-dependent channels, whereas those opened by GABAB receptor agonists are not.
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MESH Headings
- 3,4-Dichloro-N-methyl-N-(2-(1-pyrrolidinyl)-cyclohexyl)-benzeneacetamide, (trans)-Isomer
- 4-Aminopyridine/pharmacology
- Adrenergic alpha-Agonists/pharmacology
- Analgesics/pharmacology
- Animals
- Baclofen/pharmacology
- Clonidine/pharmacology
- Drug Interactions
- Female
- Mice
- Mice, Inbred Strains
- Nociceptors/drug effects
- Potassium Channels/drug effects
- Pyrrolidines/pharmacology
- Receptors, Adrenergic, alpha-2/physiology
- Receptors, GABA/drug effects
- Receptors, GABA/physiology
- Receptors, Opioid, kappa/drug effects
- Receptors, Opioid, kappa/physiology
- Sulfonylurea Compounds/pharmacology
- Tetraethylammonium
- Tetraethylammonium Compounds/pharmacology
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Ocaña M, Del Pozo E, Baeyens JM. Gliquidone, an ATP-dependent K+ channel antagonist, antagonizes morphine-induced hypermotility. Eur J Pharmacol 1993; 239:253-5. [PMID: 8223904 DOI: 10.1016/0014-2999(93)91006-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
The effect of gliquidone, an ATP-dependent K+ (KATP) channel blocker, on morphine-induced hypermotility in mice was studied. Morphine (5-40 mg/kg s.c.) dose dependently increased ambulatory activity. Gliquidone (10 micrograms/mouse i.c.v.) induced a parallel displacement to the right of the morphine dose-response curve. Moreover, gliquidone (10 and 40 micrograms/mouse i.c.v.) produced a dose-dependent antagonism of morphine (20 mg/kg s.c.)-induced hypermotility. These results suggest that KATP channels are involved in morphine-induced hypermotility. The present data, together with those of previous studies showing antagonism by KATP channel blockers of morphine-induced antinociception and hyperthermia, further indicate that the opening of KATP channels plays an important role in the mechanism of action of morphine.
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Ocaña M, Del Pozo E, Baeyens JM. ATP-dependent K+ channel blockers antagonize morphine- but not U-504,88H-induced antinociception. Eur J Pharmacol 1993; 230:203-7. [PMID: 8422902 DOI: 10.1016/0014-2999(93)90803-p] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
The effects of four ATP-dependent K+ channel blockers (hypoglycemic sulfonylureas) against morphine- and U50488H-induced antinociception were evaluated using the tail flick test in mice. None of the sulfonylureas tested significantly modified tail flick latency in control animals. However, i.c.v. pretreatment with gliquidone (0.4-1.6 micrograms/mouse), glipizide (2.5-10 micrograms/mouse), glibenclamide (10-40 micrograms/mouse) or tolbutamide (20-80 micrograms/mouse) dose dependently antagonized morphine-induced antinociception approximately equieffectively, the only difference being in potency: gliquidone > glipizide > glibenclamide > tolbutamide. This effect of sulfonylureas was very specific, since none antagonized the antinociception elicited by U50488H even at doses twice as great as the dose that induced maximum antagonism of morphine antinociception. Because morphine, but not U50488H, opens K+ channels in neurons and because the order of potency of the different sulfonylureas for blocking ATP-dependent K+ channels in neurons and for antagonizing morphine antinociception is the same, we suggest that morphine antinociception is mediated by the opening of ATP-dependent K+ channels.
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Ocaña M, Del Pozo E, Carlos R, Baeyens JM. Differential potentiation by calcium antagonists of neuromuscular blockade induced by pancuronium and succinylcholine in cats in vivo. J Neural Transm (Vienna) 1992; 88:223-34. [PMID: 1418860 DOI: 10.1007/bf01244734] [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: 12/26/2022]
Abstract
The effects of several calcium antagonists (verapamil, nicardipine and two diltiazem isomers, d-cis and l-cis diltiazem) alone and associated to non-depolarizing (pancuronium) and depolarizing (succinylcholine) neuromuscular blockers, were evaluated on sciatic nerve-tibialis anterior muscle preparations from cats in vivo. The calcium antagonists used (at 0.1 and 0.5 mg/kg iv) did not modify the height of muscular twitches elicited indirectly. However, these agents potentiated in a dose-dependent way the neuromuscular blockade induced by iv pancuronium (2-40 micrograms/kg) and succinylcholine (6-200 micrograms/kg). The order of potency in increasing the effects of pancuronium was nicardipine much greater than d-cis diltiazem greater than or equal to verapamil, whereas the order of potency in enhancing succinylcholine effects was d-cis diltiazem greater than or equal to verapamil much greater than nicardipine. The effects of diltiazem were stereoselective, thus the potentiation induced by d-cis diltiazem was significantly greater in all cases than that induced by l-cis diltiazem, which suggests that calcium channel blockade plays a role in these interactions. However, other mechanisms such as calcium antagonists-induced nicotinic receptor desensitization may also be involved.
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Ocaña M, Baeyens JM. Analgesic effects of centrally administered aminoglycoside antibiotics in mice. Neurosci Lett 1991; 126:67-70. [PMID: 1866086 DOI: 10.1016/0304-3940(91)90373-2] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The possible analgesic effects of i.c.v. administration of several aminoglycoside antibiotics were evaluated in mice using hot plate and tail flick tests. Neomycin (10-80 micrograms/mouse), gentamicin (40-160 micrograms/mouse) and kanamycin (80-320 micrograms/mouse) produced dose-dependent increases in the latencies to forepaw licking and jumping in hot plate test. These drugs also produced dose-dependent increases in the percentage of animals showing analgesia in tail flick test. The order of potency of these aminoglycoside antibiotics in both tests was neomycin greater than gentamicin greater than kanamycin, which is exactly the same order that these drugs show as N-type calcium channel blockers. Bearing in mind this fact and the well known analgesic activity of several drugs which decrease neuronal calcium availability, we suggest that the mechanism of aminoglycoside-induced antinociception may be related to the capacity of these antibiotics to block N-type calcium channels and decrease neuronal calcium availability.
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Ocaña M, Serna C. Variations of the infrared powder spectra of TiO2 and SnO2 (rutile) with polarization. ACTA ACUST UNITED AC 1991. [DOI: 10.1016/0584-8539(91)80148-c] [Citation(s) in RCA: 54] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Ocaña M, Del Pozo E, Barrios M, Robles LI, Baeyens JM. An ATP-dependent potassium channel blocker antagonizes morphine analgesia. Eur J Pharmacol 1990; 186:377-8. [PMID: 2127024 DOI: 10.1016/0014-2999(90)90466-j] [Citation(s) in RCA: 108] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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