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Bolonhezi B, Matsumura L, Turke K, Silva L, Langer A, Feder D, Carvalho A. EP.57Duchenne muscular dystrophy and stroke: systematic review of literature and two cases reports. Neuromuscul Disord 2019. [DOI: 10.1016/j.nmd.2019.06.463] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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2
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Soares I, Comprido V, Hsu B, Turke K, Silva L, Feder D, Carvalho A. EP.22Anti-HMGCR antibody in asymptomatic patients with high CK - Case report. Neuromuscul Disord 2019. [DOI: 10.1016/j.nmd.2019.06.152] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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3
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Da Silva C, Monteiro C, da Silva G, Rosa P, Feder D, Sarni R, de Souza F, Fonseca F. Evaluation of oxidative stress and inflammatory parameters in obese children treated with chia seed (salvia hispÂnica) and its implication on Vitamin E. Clin Nutr 2018. [DOI: 10.1016/j.clnu.2018.06.1561] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Ribola FA, Cançado FB, Schoueri JHM, De Toni VF, Medeiros VHR, Feder D. Effects of SGLT2 inhibitors on weight loss in patients with type 2 diabetes mellitus. Eur Rev Med Pharmacol Sci 2017; 21:199-211. [PMID: 28121337] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
SGLT2 (sodium-glucose cotransporter type 2) inhibitors are a new class of drugs which reversibly block the glucose reabsorption that occurs in the kidneys. Since their mechanisms of action do not rely on insulin secretion, they constitute a complementary alternative to the classic treatment of type 2 diabetes mellitus. A glycemic level reduction in patients who used SGLT2 inhibitors due to the reversible block of their transporters could be observed. Associated with this, there was a reduction in body weight and blood pressure (BP) caused by osmotic diuresis. Few adverse effects and low drug interaction combined with antihyperglycemic effects are some of the benefits of these inhibitors widely discussed in clinical trials. Patients with history of urogenital infections or those on diuretics must be carefully evaluated before the administration of these drugs. While a promising class of drugs indicated as a treatment for patients with type 2 diabetes mellitus, SGLT2 inhibitors should not be prescribed for individuals with severe renal or hepatic impairment. Therefore, as there are only a few situations in which they should not be indicated, the efficacy, safety and tolerability of these inhibitors allow them to be used in a wide range of patients. Nevertheless, further researches are required so that the possible long-term risks can be studied and the benefits associated with their use can be more objectively elucidated.
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Affiliation(s)
- F A Ribola
- Department of Pharmacology of ABC Medical School, São Paulo, Brazil.
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Bacci MR, Leme RCP, Zing NPC, Murad N, Adami F, Hinnig PF, Feder D, Chagas ACP, Fonseca FLA. IL-6 and TNF-α serum levels are associated with early death in community-acquired pneumonia patients. ACTA ACUST UNITED AC 2015; 48:427-32. [PMID: 25714883 PMCID: PMC4445666 DOI: 10.1590/1414-431x20144402] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2014] [Accepted: 12/11/2014] [Indexed: 12/18/2022]
Abstract
Community-acquired pneumonia (CAP) is amongst the leading causes of death worldwide.
As inflammatory markers, cytokines can predict outcomes, if interpreted together with
clinical data and scoring systems such as CURB-65, CRB, and Acute Physiology and
Chronic Health Evaluation II (APACHE II). The aim of this study was to determine the
impact of inflammatory biomarkers on the early mortality of hospitalized CAP
patients. Twenty-seven CAP patients needing hospitalization were enrolled for the
study and samples of interleukin-1 (IL-1) and interleukin-6 (IL-6), tumor necrosis
factor alpha (TNF-α), C-reactive protein (CRP), and homocystein were collected at the
time of admission (day 1) as well as on the seventh day of the treatment. There was a
significant reduction in the levels of IL-6 between the first and the second
collections. Median IL-6 values decreased from 24 pg/mL (day 1) to 8 pg/mL (day 7)
(P=0.016). The median levels of TNF-α were higher in patients: i) with acute kidney
injury (AKI) (P=0.045), ii) requiring mechanical ventilation (P=0.040), iii) with
short hospital stays (P=0.009), iv) admitted to the intensive care unit (ICU)
(P=0.040), v) who died early (P=0.003), and vi) with worse CRB scores (P=0.013). In
summary, IL-6 and TNF-α levels were associated with early mortality of CAP patients.
Longer admission levels demonstrated greater likelihood of early death and overall
mortality, necessity of mechanical ventilation, and AKI.
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Affiliation(s)
- M R Bacci
- Departamento de Cliníca Médica, Faculdade de Medicina do ABC, Santo André, SP, Brasil
| | - R C P Leme
- Departamento de Cliníca Médica, Faculdade de Medicina do ABC, Santo André, SP, Brasil
| | - N P C Zing
- Departamento de Cliníca Médica, Faculdade de Medicina do ABC, Santo André, SP, Brasil
| | - N Murad
- Departamento de Cardiologia, Faculdade de Medicina do ABC, Santo André, SP, Brasil
| | - F Adami
- Departamento de Cliníca Médica, Faculdade de Medicina do ABC, Santo André, SP, Brasil
| | - P F Hinnig
- Departamento de Cliníca Médica, Faculdade de Medicina do ABC, Santo André, SP, Brasil
| | - D Feder
- Departamento de Farmacologia, Faculdade de Medicina do ABC, Santo André, SP, Brasil
| | - A C P Chagas
- Departamento de Cardiologia, Faculdade de Medicina do ABC, Santo André, SP, Brasil
| | - F L A Fonseca
- Departamento de Cliníca Médica, Faculdade de Medicina do ABC, Santo André, SP, Brasil
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Bruniera FR, Ferreira FM, Saviolli LRM, Bacci MR, Feder D, da Luz Gonçalves Pedreira M, Sorgini Peterlini MA, Azzalis LA, Campos Junqueira VB, Fonseca FLA. The use of vancomycin with its therapeutic and adverse effects: a review. Eur Rev Med Pharmacol Sci 2015; 19:694-700. [PMID: 25753888] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
OBJECTIVE Vancomycin (VCM) is a tricyclic glycopeptide antibiotic produced by Streptococcus orientalis. Widely used in hospitals, it is indicated to fight severe infections caused by Gram-positive bacteria, especially with the advent of MRSA (methicillin-resistant Staphylococcus aureus), penicillin-resistant pneumococci among others. Furthermore, it is indicated for the treatment of patients allergic to penicillins and cephalosporins. Dose recommendations, dilution rates and types of infusion are controversial and also result in toxic effects. Aim of this paper was to perform a literature review showing the therapeutic and adverse effects of vancomycin. MATERIALS AND METHODS This is a literature review of recent articles published on MEDLINE and SciELO databases in English, Portuguese and Spanish. RESULTS The main adverse effects of vancomycin are: hypotension, phlebitis, nephrotoxicity, ototoxicity, hypersensitivity reactions, red man syndrome, neutropenia, chills, fever, interstitial nephritis. CONCLUSIONS The use of vancomycin is still very common; however, inadequate doses and prolonged therapy pose a risk of increasing minimum inhibitory concentrations (MICs), resulting in subtherapeutic levels, treatment failures and toxicity. Therefore, further studies should be conducted to optimize the administration of vancomycin, monitoring treatments from the beginning in order to ensure a safe and effective use of the drug.
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Affiliation(s)
- F R Bruniera
- Discipline of Pharmacology, Morphology Department, Faculdade de Medicina do ABC, Santo André, Brazil.
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7
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Feder D, Rugollini M, Santomauro A, Oliveira LP, Lioi VP, Santos RD, Ferreira LG, Nunes MT, Carvalho MH, Delgado PO, Carvalho AAS, Fonseca FLA. Erythropoietin reduces the expression of myostatin in mdx dystrophic mice. ACTA ACUST UNITED AC 2014. [PMID: 25296358 PMCID: PMC4230286 DOI: 10.1590/1414-431x20143858] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Erythropoietin (EPO) has been well characterized as a renal glycoprotein hormone
regulating red blood cell production by inhibiting apoptosis of erythrocyte
progenitors in hematopoietic tissues. EPO exerts regulatory effects in cardiac and
skeletal muscles. Duchenne muscular dystrophy is a lethal degenerative disorder of
skeletal and cardiac muscle. In this study, we tested the possible therapeutic
beneficial effect of recombinant EPO (rhEPO) in dystrophic muscles in mdx mice. Total
strength was measured using a force transducer coupled to a computer. Gene expression
for myostatin, transforming growth factor-β1 (TGF-β1), and tumor necrosis factor-α
(TNF-α) was determined by quantitative real time polymerase chain reaction. Myostatin
expression was significantly decreased in quadriceps from mdx mice treated with rhEPO
(rhEPO=0.60±0.11, control=1.07±0.11). On the other hand, rhEPO had no significant
effect on the expression of TGF-β1 (rhEPO=0.95±0.14, control=1.05±0.16) and TNF-α
(rhEPO=0.73±0.20, control=1.01±0.09). These results may help to clarify some of the
direct actions of EPO on skeletal muscle.
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Affiliation(s)
- D Feder
- Faculdade de Medicina do ABC, Santo André, SP, Brasil
| | - M Rugollini
- Faculdade de Medicina do ABC, Santo André, SP, Brasil
| | - A Santomauro
- Faculdade de Medicina do ABC, Santo André, SP, Brasil
| | - L P Oliveira
- Faculdade de Medicina do ABC, Santo André, SP, Brasil
| | - V P Lioi
- Faculdade de Medicina do ABC, Santo André, SP, Brasil
| | - R dos Santos
- Instituto de Ciências Biomédicas, Universidade de São Paulo, São Paulo, SP, Brasil
| | - L G Ferreira
- Instituto de Ciências Biomédicas, Universidade de São Paulo, São Paulo, SP, Brasil
| | - M T Nunes
- Instituto de Ciências Biomédicas, Universidade de São Paulo, São Paulo, SP, Brasil
| | - M H Carvalho
- Instituto de Ciências Biomédicas, Universidade de São Paulo, São Paulo, SP, Brasil
| | - P O Delgado
- Faculdade de Medicina do ABC, Santo André, SP, Brasil
| | | | - F L A Fonseca
- Faculdade de Medicina do ABC, Santo André, SP, Brasil
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Castro RF, Azzalis LA, Feder D, Perazzo FF, Pereira EC, Junqueira VBC, Rocha KC, Machado CD, Paschoal FC, Gnann LA, Fonseca FLA. Safety and efficacy analysis of liposomal insulin-like growth factor-1 in a fluid gel formulation for hair-loss treatment in a hamster model. Clin Exp Dermatol 2012; 37:909-12. [PMID: 22924775 DOI: 10.1111/j.1365-2230.2012.04441.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Insulin-like growth factor (IGF)-1 has shown some interesting results in studies examining its use as a hair-loss treatment. IGF-1 works by regulating cellular proliferation and migration during the development of hair follicles. Hepatotoxicity and myelotoxicity were evaluated in hamsters (Mesocricetus auratus) after topical application of the liquid gel vehicle (placebo), 1% IGF-1 or 3% IGF-1. No significant difference in the levels of aspartate aminotransferase or alanine aminotransferase was found between the control and treated groups. ELISA did not shown any increase in the plasma level of IGF-1. A haematopoietic niche was found, but it was not associated with myelotoxicity. Efficacy was determined by dermatoscopy analysis of hair density and microscopy analysis of hair diameter, with hair found to be thicker and with more rapid growth in the 3% group than in either the 1% group or the control group. These results strongly suggest that liposomal IGF-1 in a liquid gel formulation is a safe and efficient treatment for hair loss.
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Affiliation(s)
- R F Castro
- Discipline of Dermatology, Department of Clinical Medicine, Faculty of Medicine ABC, Santo André, SP, Brazil
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Feder D, Segtnan B. G.P.13.12 Parents vision on Duchenne muscular dystrophy (DMD) research. Neuromuscul Disord 2009. [DOI: 10.1016/j.nmd.2009.06.307] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Gomes SAO, Misael D, Silva BA, Feder D, Silva CS, Gonçalves TCM, Santos ALS, Santos-Mallet JR. Major cysteine protease (cruzipain) in Z3 sylvatic isolates of Trypanosoma cruzi from Rio de Janeiro, Brazil. Parasitol Res 2009; 105:743-9. [DOI: 10.1007/s00436-009-1446-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2008] [Accepted: 04/17/2009] [Indexed: 11/30/2022]
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Mello CB, Mendonça-Lopes D, Feder D, Uzeda CD, Carneiro RM, Rocha MA, Gonzalez MS. Laboratory evaluation of the effects of triflumuron on the development of Rhodnius prolixus nymph. Mem Inst Oswaldo Cruz 2008; 103:839-42. [DOI: 10.1590/s0074-02762008000800017] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2008] [Accepted: 09/08/2008] [Indexed: 11/22/2022] Open
Affiliation(s)
- CB Mello
- Universidade Federal Fluminense, Brasil
| | | | - D Feder
- Universidade Federal Fluminense, Brasil
| | - CD Uzeda
- Universidade Federal Fluminense, Brasil
| | | | - MA Rocha
- Universidade Federal Fluminense, Brasil
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12
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Azambuja P, Feder D, Garcia ES. Isolation of Serratia marcescens in the midgut of Rhodnius prolixus: impact on the establishment of the parasite Trypanosoma cruzi in the vector. Exp Parasitol 2004; 107:89-96. [PMID: 15208042 DOI: 10.1016/j.exppara.2004.04.007] [Citation(s) in RCA: 133] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2003] [Revised: 02/04/2004] [Accepted: 04/15/2004] [Indexed: 10/26/2022]
Abstract
The effects of resident bacteria in the stomach of 5th-instar larvae of Rhodnius prolixus on the erythrocyte lysis and Trypanosoma cruzi infection were studied. The bacteria population increased approximately 10,000-fold after feeding. Hemolysis rose to approximately 28% within 24h postfeeding and then linearly grew until day 4 attaining almost 100%. The number of surviving Y strain of T. cruzi in the stomach declined drastically, while the infection with Dm28c clone was maintained stable. Five days after feeding, few different types of bacterial colonies were obtained when stomach content suspensions were spread onto BHI agar plates. The hemolytic bacteria were isolated and identified as Serratia marcescens biotype A1a (referenced as RPH), which produces the pigment prodigiosin. In vitro experiments, comparing incubations of RPH with S. marcescens SM365, a prodigiosin pigment producer, and S. marcescens DB11, a nonpigment variant, as a control, with erythrocytes and T. cruzi demonstrated that: (i) at 30 degrees C, SM365 and RPH diminished the populations of Y strain, but not DM28c clone, and DB11 was unable to lyse both T. cruzi strains; (ii) at 0 degrees C, SM263 and RPH killed the flagellates, but DB11 did not; and (iii) all three strains of S. marcescens were able to lyse erythrocytes. These results suggest that S. marcescens trypanolytic activity from the SM365 and RPH strains is distinct from the hemolytic activity and that prodigiosin is an important factor for the trypanolytic action of the bacteria.
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Affiliation(s)
- P Azambuja
- Departamento de Bioquímica e Biologia Molecular, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz, Av. Brasil 4365, CEP 21045-900, Rio de Janeiro, RJ, Brazil.
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Gomes SAO, Feder D, Garcia ES, Azambuja P. Suppression of the prophenoloxidase system in Rhodnius prolixus orally infected with Trypanosoma rangeli. J Insect Physiol 2003; 49:829-37. [PMID: 16256685 DOI: 10.1016/s0022-1910(03)00133-1] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2003] [Revised: 05/20/2003] [Accepted: 05/20/2003] [Indexed: 05/05/2023]
Abstract
Investigations were carried out to compare aspects of the prophenoloxidase (proPO)-activating pathway in Rhodnius prolixus hemolymph in response to oral infection and inoculation of the insects with two developmental forms of Trypanosoma rangeli epimastigotes strain H14. In vivo experiments demonstrated that in control insects fed on uninfected blood, inoculation challenge with short epimastigotes resulted in high phenoloxidase (PO) activity. In contrast, previous feeding on blood containing either short or long epimastigotes was able to suppress the proPO activation induced by thoracic inoculation of the short forms. In vitro assays in the presence of short epimastigotes demonstrated that control hemolymph or hemolymph provided by insects previously fed on blood containing epimastigotes incubated with fat body homogenates from control insects significantly increased the PO activity. However, fat body homogenates from insects previously fed on blood containing epimastigotes, incubated with hemolymph taken from insects fed on control blood or blood infected with epimastigotes, drastically reduced the proPO activation. The proteolytic activity in the fat body homogenates of control insects was significantly higher than in those obtained from fat body extracts of insects previously fed on blood containing epimastigotes. These findings indicate that the reduction of the proteolytic activities in the fat body from insects fed on infected blood no longer allows a significant response of the proPO system against parasite challenge. It also provides a better understanding of T. rangeli infection in the vector and offer novel insights into basic immune processes in their invertebrate hosts.
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Affiliation(s)
- S A O Gomes
- Instituto Oswaldo Cruz, Fundação Oswaldo Cruz, Departamento de Bioquímica e Biologia Molecular, Av. Brasil 4365, Rio de Janeiro 21045-900, Brazil
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14
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Barak Z, Fawcett E, Feder D, Lorincz G, Walker MB. Experimental and theoretical investigation of the magnetic phase diagram of chromium. ACTA ACUST UNITED AC 2000. [DOI: 10.1088/0305-4608/11/4/020] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Affiliation(s)
- P Azambuja
- Departamento de Bioquímica e Biologia Molecular, Instituto Oswaldo Cruz, Rio de Janeiro, Brasil.
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17
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Abstract
Protease activities in the haemolymph and fat body in a bloodsucking insect, Rhodnius prolixus, infected with Trypanosoma rangeli, were investigated. After SDS-polyacrylamide gel electrophoresis containing gelatin as substrate, analysis of zymograms performed on samples of different tissues of controls and insects inoculated or orally infected with short or long epimastigotes of T. rangeli, demonstrated distinct patterns of protease activities: (i) proteases were detected in the haemolymph of insects which were fed on, or inoculated with, short epimastigotes of T. rangeli (39 kDa and 33 kDa, respectively), but they were not observed in the fat body taken from these insects; (ii) protease was also presented in the fat bodies derived from naive insects or controls inoculated with sterile phosphate-saline buffer (49 kDa), but it was not detected in the haemolymph of these insects; (iii) no protease activity was observed in both haemolymph and fat bodies taken from insects inoculated with, or fed on, long epimastigotes of T. rangeli. Furthermore, in short epimastigotes of T. rangeli extracts, three bands of the protease activities with apparent molecular weights of 297, 198 and 95 kDa were detected while long epimastigotes preparation presented only two bands of protease activities with molecular weights of 297 and 198 kDa. The proteases from the insect infected with T. rangeli and controls belong to the class of either metalloproteases or metal-activated enzymes since they are inhibited by 1,10-phenanthroline. The significance of these proteases in the insects infected with short epimastigotes of T. rangeli is discussed in relation to the success of the establishment of infection of these parasites in its vector, R. prolixus.
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Affiliation(s)
- D Feder
- Departamento de Bioquímica e Biologia Molecular, Instituto Oswaldo Cruz, Rio de Janeiro, RJ, 21045-900, Brasil
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18
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Abstract
Studies were carried out on the activation of the prophenoloxidase (proPO) in adults of Rhodnius prolixus infected by short and long epimastigote forms of Trypanosoma rangeli. The in vitro activation of the proPO cascade using l-DOPA as substrate was very low in the absence of fat body extract, hemolymph, and parasites. On the other hand, a higher PO activity was observed when short, but not long, epimastigotes of T. rangeli were incubated with fresh hemolymph, fat body extract, and l-DOPA. Supernatant from lysed long epimastigotes increased the PO activity at levels identical to those observed with supernatants from lysed short epimastigotes. Similarly, the PO activity of hemolymph obtained from inoculated insects with long epimastigotes of T. rangeli showed a very low activity when incubated with l-DOPA compared to the PO activity of hemolymph taken from insects inoculated with short epimastigotes of T. rangeli. Control insects inoculated with sterile PBS showed no PO activity. These data indicate the presence of (a) factor(s) in the hemolymph as well as in the fat body extract that may be released (or induced) by the presence of short epimastigotes of T. rangeli and which results in the activation of the R. prolixus proPO system. The implications of these findings are discussed in relation to the development of T. rangeli and its ability to overcome the proPO system, survive, and successfully colonize the hemolymph of R. prolixus.
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Affiliation(s)
- S A Gomes
- Departamento de Bioquímica e Biologia Molecular, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz, Avenue Brasil 4365, Rio de Janeiro, RJ, CEP 21045-900, Brazil
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19
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Feder D, Salles JM, Garcia ES, Azambuja P. Haemolymph and fat body metallo-protease associated with Enterobacter cloacae infection in the bloodsucking insect, Rhodnius prolixus. Mem Inst Oswaldo Cruz 1998; 93:823-6. [PMID: 9921310 DOI: 10.1590/s0074-02761998000600023] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Analysis of zymograms with SDS-polyacrilamide gel electrophoresis containing gelatin as substrate, and performed on samples of haemolymph or fat body taken from Rhodnius prolixus inoculated or not with Enterobacter cloacae, demonstrated distinct patterns of protease activities: (i) in the haemolymph two proteases were induced in insects inoculated with bacteria; (ii) two proteases were detected in the fat bodies derived from non-inoculated controls or insect inoculated with sterile culture medium; (iii) haemolymph and fat body had both the same apparent molecular weights proteases (46 and 56 kDa); and (iv) these enzymes were characterized as metallo-proteases. The association of these enzymes in Rhodnius infected with bacteria was discussed.
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Affiliation(s)
- D Feder
- Departamento de Bioquímica e Biologia Molecular, Instituto Oswaldo Cruz, Rio de Janeiro, RJ, Brasil
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20
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Garcia ES, Azambuja P, de Souza W, Feder D, Nogueira NF, Gonzalez MS. Role of the head in the ultrastructural midgut organization in Rhodnius prolixus larvae: evidence from head transplantation experiments and ecdysone therapy. J Insect Physiol 1998; 44:553-560. [PMID: 12769937 DOI: 10.1016/s0022-1910(98)00048-1] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Studies on the effects of decapitation, head transplantation and ecdysone therapy on the ultrastructural organization of the midgut in 5th-instar larvae of Rhodnius prolixus, were carried out. Control insects had a typical and significant organization of the epithelial cells (mainly microvilli, extracellular membrane layers and basal portion of the epithelial cells) of the midgut (stomach and intestine) during the entire period of the experiment. However, the host larvae, when decapitated 1 day after feeding, demonstrated significant changes in the ultrastructural organization of the epithelial cells of these compartments. In converse experiments, head transplantations from untreated donors 4-5 days after feeding into headless larvae sustained the ultrastructural organization of the epithelial cells in the midgut. Oral therapy with ecdysone (5 &mgr;g/mL of blood meal) in decapitated insects significantly reversed the altered organization of the stomach and intestine. These results point to a brain factor, possibly the prothoracicotropic hormone (PTTH) which stimulates ecdysteroid production in the prothoracic glands, may be a factor responsible, directly or indirectly, for the midgut cell organization in R. prolixus.
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Affiliation(s)
- E S. Garcia
- Department of Biochemistry and Molecular Biology, Fundação Oswaldo Cruz, Av. Brasil 4365, Castel Mourisco-5o Andar, Manguinhos, CEP 21045-900, Rio de Janeiro, Brazil
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21
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Abstract
Starved larvae of Rhodnius prolixus, when challenged with Enterobacter cloacae B12, had their mortality related to their period of starvation. R. prolixus larvae fed on plasma alone, compared with insects fed on whole blood, had their immune reactivity affected as shown by: (i) a significant reduction in the ability to produce cecropin-like and lysozyme activities in the haemolymph when inoculated with E. cloacae; (ii) a reduction in numbers of haemocytes and nodule formation following challenge with bacteria; (iii) a decreased ability of plasma-fed insects in destroying their infection caused by inoculation of E. cloacae cells; and (iv) alpha-ecdysone therapy counteracted the immune depression in Rhodnius larvae fed on plasma alone. However, unlike other immune reactions, this set of experiments failed to demonstrate any interference of the plasma feeding on the prophenoloxidase-activating system, since melanin production was not reduced when the system was stimulated by the presence of bacteria in the haemolymph. The significance of these data is discussed in relation to the effect of diet components and the moulting hormone on the immune reactivity in insects.
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Affiliation(s)
- P Azambuja
- Departamento de Bioqui;mica e Biologia Molecular, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz, Av. Brasil 4365, Rio de Janeiro, Brazil
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Groopman JE, Feder D. Hematopoietic growth factors in AIDS. Semin Oncol 1992; 19:408-14. [PMID: 1380730] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Three hematopoietic growth factors, erythropoietin, GM-CSF, and G-CSF, have all been evaluated in the context of HIV infection. Recombinant human Epo is currently licensed for therapy of anemia related to zidovudine and is well tolerated in this patient population. Although myelosuppression can clearly be overcome using recombinant human GM-CSF or G-CSF in HIV-infected hosts, the clinical benefits for such patients are still not determined. It is likely that these growth factor therapies will allow for delivery of certain important myelosuppressive medications that otherwise could not be tolerated. Improvements in virological quantitation in vivo should help settle the controversies regarding modulation of HIV replication caused by cytokine treatment. The clinical use of hematopoietic growth factors in HIV disease requires further study with regard to the optimization of increases in blood cell number and/or modulation of blood cell function.
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Affiliation(s)
- J E Groopman
- Division of Hematology/Oncology, New England Deaconess Hospital, Harvard Medical School, Boston, MA 02215
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Feder D, Bishop JM. Identification of platelet membrane proteins that interact with amino-terminal peptides of pp60c-src. J Biol Chem 1991; 266:19040-6. [PMID: 1717459] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Platelets contain exceptionally high levels of pp60c-src and, thus, provide a convenient system for investigating the physiological function of this protein-tyrosine kinase. We have employed chemical cross-linking of myristylated amino-terminal peptides of pp60c-src to platelet membranes in order to identify platelet membrane components that interact with pp60c-src to regulate or mediate its activity. We detected specific binding of radioiodinated peptides to platelet membrane proteins of 32, 50, 92, and 105 kDa. The 32-kDa protein may be related to the putative src receptor component recently identified in fibroblast membranes. The most reactive platelet protein, however, is the 50-kDa protein, which is either absent or nonreactive in fibroblast membranes. Binding of src peptides to this protein was saturable, and we estimate the presence of approximately 1 x 10(6) of the 50-kDa binding sites per platelet. The specificity of the peptide binding to the 50- and 32-kDa platelet proteins was analyzed by competition with different peptides. The binding sites displayed an absolute requirement for an N-myristoyl moiety and a strong preference for pp60c-src amino-terminal sequences. The identification of these src-interacting proteins may help to decipher the biochemical pathways in which platelet pp60c-src is involved.
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Affiliation(s)
- D Feder
- Department of Microbiology and Immunology, G. W. Hooper Research Foundation, University of California, San Francisco 94143
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Affiliation(s)
- D T Scadden
- Hematology/Oncology Division, New England Deaconess Hospital, Harvard Medical School, 110 Francis St., Suite 4A, Boston, Massachusetts 02215, USA
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25
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Feder D, Bueno MA, Krybus J, Novak A, Martins MC, Andrade Júnior AF, Cabral M. [Effects of H2 blockers on the spreading of macrophages in vitro]. Rev Paul Med 1991; 109:213-6. [PMID: 1687946] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
PURPOSE To verify if cimetidine, ranitidine, and famotidine, when inoculated by ip route in mice, do enhance macrophage activation and whether or not such activation is altered with prior use of sodium thioglycolate. KIND OF STUDY: Experimental. ANIMALS isogenic, Balb/c mice, 19-21 g. INTERVENTION The authors used 8 groups of 10 animals. The mice were treated by ip route with cimetidine (100 mg/kg), ranitidine (62.5 mg/kg), and famotidine (50 mg/kg), and were compared to a control group (saline). The method of spreading of macrophages was applied twenty-four hours after the inoculation. The same procedure was repeated on a later stage in groups submitted to a prior treatment with sodium thioglycolate (15 mg/kg). EVALUATION Kruskal-Wallis and Mann-Whitney's tests were used. RESULTS Inoculation of anti-H2 drugs in the peritoneal cavity of mice significantly enhances the spreading of macrophages independently of the presence of a peritoneal irritant.
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Affiliation(s)
- D Feder
- Departamento de Morfologia e Fisiologia da Faculdade de Medicina do ABC, São Paulo
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26
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Feder D, Romaldini H. [Cough induced by angiotensin converting enzyme inhibitors: report of a case by lysinopril]. AMB Rev Assoc Med Bras 1991; 37:160. [PMID: 1668546] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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27
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Feder D, Romaldini H, Silva CO, dos Santos ML. [The effect of nifedipine on hemodynamics and gas exchange in dogs with experimental acute respiratory insufficiency]. Arq Bras Cardiol 1991; 57:27-32. [PMID: 1823758] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
PURPOSE Evaluate the action of nifedipine, a calcium channel blocking agent, on the hemodynamics and gas exchange experimental acute respiratory failure. METHODS Lung injury was provoked in sixteen mongrel dogs with intratracheal instillation of hydrochloric acid (HC1) (0.1N; pH = 2.0; 2.0 ml/kg body weight). As steady state was achieved after HC1 instillation (maintenance of a stable arterial PO2), saline 1 ml (six dogs) or nifedipine (ten dogs) 30 micrograms/kg for body weight were intravenously injected. The hemodynamic variables and gas exchange parameters were analyzed before HC1, after HC1 and 10 and 30 minutes after nifedipine or saline. RESULTS The intratracheal instillation of HC1 provoked significant drop of PaO2, of systemic oxygen transport index (ITO2S), and increase of venous admixture (QVA/Q). Nifedipine provoked significant reduction of the mean systemic arterial pressure (Pas), and of the systemic (IRVS) and pulmonary vascular resistance index (IRVP), with significant increase of cardiac (IC) and systolic index (IS), with no changes ot the mean arterial pulmonary (Pap) and capillary pressures (Pcap). After nifedipine there was a significant increase of PaO2, PvO2, and ITO2S, with no significant variations of QVA/Q and alveolar arterial O2 difference (P(A-a)O2). CONCLUSION Nifedipine promoted systemic vasodilation, and probably by increasing the venous return and/or by a reflex mechanism, the cardiac output increased, augmenting the ITO2S. The IRVP decreased in the nifedipine group, with no significant alterations of Pap and Pcap, probably consequent to the systemic vasodilation provoked by the drug. The arterial PO2 augmented in the nifedipine group, as a consequence of mixed venous PO2 increase, since no changes occurred in QVA/Q, P(A-a)O2, inspired fraction of O2 and alveolar ventilation.
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Affiliation(s)
- D Feder
- Escola Paulista de Medicina, São Paulo
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Feder D, Bishop JM. Purification and enzymatic characterization of pp60c-src from human platelets. J Biol Chem 1990; 265:8205-11. [PMID: 1692324] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
The purification of pp60c-src has been hampered by the low levels of protein it represents in most cells and its tendency to undergo proteolysis during purification. The discovery that the platelet expresses unusually high levels of pp60c-src has made large-scale purification from a normal source feasible. We have developed a method for the purification of intact pp60c-src to near homogeneity from human platelets and have determined the enzymatic properties of this purified protein in vitro. Rapid, high yield purification of pp60c-src from isolated platelet membranes was achieved in a two-step protocol involving sequential chromatography on an anti-pp60c-src immunoaffinity matrix and phenyl-Sepharose. This protocol yielded 0.5 mg of pp60c-src from 30 units of platelets. Using enolase as an exogenous substrate, the specific activity of the enzyme was 25 nmol P.min-1.mg-1. The Km for MnATP2- for enolase phosphorylation (2.2 microM) was higher than for the autophosphorylation of pp60c-src (0.6 microM). Maximal enzyme activity required either Mn2+ or Mg2+, and both ATP and GTP could be utilized as the phosphate donor. Evidence is shown which indicate that the autophophorylation of pp60c-src in vitro occurs through an intramolecular mechanism and that this reaction is reversible.
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Affiliation(s)
- D Feder
- Department of Microbiology and Immunology, University of California Medical Center, San Francisco 94143
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Feder D, Figueiredo MS, da Silva GP, Romaldini H. [Idiopathic pulmonary hemosiderosis in the adult: a case report]. Rev Paul Med 1990; 108:95-6. [PMID: 2291762] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The case of idiopathic pulmonary hemosiderosis in a 20 year old male is presented. Iron deficiency anemia, recurrent hemoptysis and micronodular infiltrate in lower lung areas were the most important signs observed. The transbronchial biopsy showed alveolar and interstitial hemorrhage and hemosiderin in the pulmonary macrophages. Treatment was started with prednisone, but the addition of immunosuppressive drugs (cyclophosphamide) was needed, followed by a clinical remission.
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Affiliation(s)
- D Feder
- Médico do Ambulatório Geral da Escola Paulista de Medicina (EPM)
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Garcia ES, Feder D, Gomes JE, Rembold H. Short- and long-term effects of azadirachtin A on development and egg production of Rhodnius prolixus. Mem Inst Oswaldo Cruz 1990; 85:11-5. [PMID: 2215221 DOI: 10.1590/s0074-02761990000100002] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Azadirachtin A was given through a blood meal to 4th-instar larvae and to adult females of Rhodnius prolixus. Development (ecdysis) and egg production were inhibited in a dose-dependent manner. Long-term experiments with subsequent four feedings on azadirachtin-free blood were performed with 4th-instar larvae and with adult females. Only in the low-dose azadirachtin larval groups (0.01 and 0.1 microgram/ml of blood), development was partially restored; after a single 1.0 microgram/ml treatment about 50% of the treated larvae were still alive 120 days later without any adult emergence. Similarly fed females had a dose-dependent lower survival and egg deposition rate. The results are discussed in relation to the mode of azadirachtin A action.
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Affiliation(s)
- E S Garcia
- Instituto Oswaldo Cruz, Departamento de Bioquímica e Biologia Molecular, Rio de Janeiro, Brasil
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Feder D, Romaldini H. [Pulmonary hypertension in adult respiratory distress syndrome: review of the literature]. Rev Paul Med 1989; 107:244-9. [PMID: 2701193] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
This paper is a review of clinical and experimental studies on pulmonary hypertension in acute respiratory distress syndrome (ARDS) and its consequences on the outcome of such syndrome. The most probable causes: hypoxic pulmonary vasoconstriction, vasoconstriction provoked by vasoactive substances, extra and intraluminal occlusions are discussed. The authors also discuss the action of vasoactive drugs on the pulmonary circulation and on the pulmonary gas exchange.
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Feder D, Romaldini H, dos Santos ML. [Hemodynamic and pulmonary effects of nifedipine]. Rev Paul Med 1989; 107:113-8. [PMID: 2697929] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The authors reviewed the actions of nifedipine, a blocker of calcium channels, on the systemic and pulmonary circulation. The mechanism of action of the drug on the systemic and pulmonary circulation and on the gas exchange is discussed. The main effects of nifedipine on the coronary circulation and indications for therapeutic use of the drug are discussed on the topics of coronary insufficiency, systemic and pulmonary blood hypertension, acute respiratory failure, and Raynaud's phenomenon.
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Valente O, Muniz JR, Maciel RM, Feder D, Gebara MB. [Changes of creatine phosphokinase and creatine phosphokinase isoenzyme in primary hypothyroidism before and after the treatment with thyroid hormone]. Rev Paul Med 1988; 106:126-30. [PMID: 3251342] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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Garcia ES, Feder D, Gomes JE, de Azambuja P. Effects of precocene and azadirachtin in Rhodnius prolixus: some data on development and reproduction. Mem Inst Oswaldo Cruz 1987; 82 Suppl 3:67-73. [PMID: 3334403 DOI: 10.1590/s0074-02761987000700014] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
The results presented in this paper clearly indicate that precocene and azadirachtin are effective inhibitors of moulting and reproduction in the hemipteran Rhodnius prolixus. The time of application is important and only applications of these substances early in the intermoulting period cause their effects in nymphs. The inhibition of moulting is fully reversed by ecdysone therapy. Precocene and azadirachtin also affected drastically the oogenesis and egg deposition in this insect. Precocene-induced sterilization is reversed by application of juvenile hormone III. However, this hormone is unable to reverse the effect of azadirachtin on reproduction. Ecdysteroid titers in nymphs and adult females are decreased by these treatments. In vitro analysis suggest that precocene and azadirachtin may act directly on the prothoracic glands and ovaries producing ecdysteroids. Based on these and other findings the possible mode of action of these compounds on the development and reproduction of Rhodnius prolixus is discussed.
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Affiliation(s)
- E S Garcia
- Departamento de Bioquímica e Biologia Molecular, Rio de Janeiro, Brasil
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Feder D, Im MJ, Klein HW, Hekman M, Holzhöfer A, Dees C, Levitzki A, Helmreich EJ, Pfeuffer T. Reconstitution of beta 1-adrenoceptor-dependent adenylate cyclase from purified components. EMBO J 1986; 5:1509-14. [PMID: 3017696 PMCID: PMC1166973 DOI: 10.1002/j.1460-2075.1986.tb04390.x] [Citation(s) in RCA: 84] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
In continuation of our efforts to reconstitute from purified components into lipid vesicles the signal transmission chain from beta 1-adrenoceptors to adenylate cyclase, we now report on the total reconstitution of the hormone-dependent adenylate cyclase. In these reconstitution experiments we have employed the purified adenylate cyclase (C) from bovine brain and rabbit heart, the stimulatory GTP-binding protein (GS) purified from turkey erythrocytes and rabbit liver and the beta 1-adrenoceptor (R) from turkey erythrocytes. Several detergents were compared with respect to their suitability to allow reconstitution of subunits into phospholipid vesicles. While octyl-polyoxyethylene (octyl-POE) was almost as potent as lauroyl-sucrose for preparation of vesicles containing GS.C, the latter detergent was clearly superior for vesicles enabling productive R.GS and R.GS.C coupling. The catalytic subunit from either bovine brain or rabbit heart was equally efficient in reconstitution. However, GS from turkey erythrocytes and rabbit liver revealed significant differences in RGS and RGS.C containing vesicles. While isoproterenol-induced activation of GS by GTP gamma S was first order in both instances, kon with turkey GS was 0.12 min-1, whereas kon with rabbit liver GS was 0.6 min-1. Moreover, GTP gamma S activation of erythrocyte GS was significantly more dependent on the presence of hormone than that of liver GS, confirming observations made on the native membrane-bound system. Compared with stimulation by isoproterenol (GTP gamma S) (4-fold), stimulation by isoproterenol/GTP was modest (1.3- to 1.6-fold).(ABSTRACT TRUNCATED AT 250 WORDS)
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Feder D, Langer AL, Alexandrino E, Medeiros S, Lotto M, Valente O. [Probucol in the treatment of hyperlipidemias]. Arq Bras Cardiol 1986; 46:77-80. [PMID: 3827649] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
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Gontar G, Cardash Z, Feder D, Helft M. A reinforced composite resin fixed partial denture. Refuat Hashinayim 1986; 4:16-9. [PMID: 3516473] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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39
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Fitzig S, Feder D, Marshak B, Orstein M. An improved copper band impression technique. Quintessence Int 1985; 16:851-3. [PMID: 3913987] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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40
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Hekman M, Feder D, Keenan AK, Gal A, Klein HW, Pfeuffer T, Levitzki A, Helmreich EJ. Reconstitution of beta-adrenergic receptor with components of adenylate cyclase. EMBO J 1984; 3:3339-45. [PMID: 6098472 PMCID: PMC557860 DOI: 10.1002/j.1460-2075.1984.tb02301.x] [Citation(s) in RCA: 54] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
Beta 1-Adrenergic receptor proteins were extracted from turkey erythrocyte membranes with lauroyl sucrose and digitonin and purified by affinity chromatography on a column of alprenolol agarose Affi-gel 10 or 15. The 5000-fold purified receptor is able to couple functionally with the stimulatory GTP-binding protein (GS) from either turkey or duck erythrocytes. Functional coupling was achieved by three different approaches. (i) Purified beta-receptor polypeptides were coupled in phospholipid (asolectin) vesicles with GS from a crude cholate or lauroyl sucrose extract of turkey erythrocyte membranes. The detergent was removed and vesicles were formed with SM-2 beads. (ii) Purified beta-receptor was reconstituted with pure, homogeneous GS in asolectin vesicles. (iii) Purified beta-receptors were either coupled in asolectin vesicles with a mixture of pure, homogeneous Gpp(NH)p-activated GS and a lauroyl sucrose extract of turkey erythrocyte membranes, or with pure, homogeneous Gpp(NH)p-activated GS alone. The decay of activity was measured on addition of GTP and hormone. In (ii) and (iii), the detergent was removed and vesicles were formed by gel filtration on Sephadex G-50 columns. In each of the three different experimental conditions, the beta-receptor was activated with l-isoproterenol and activation was blocked with d,l-propranolol. Activated GS were measured separately by means of their capacity to activate a crude Lubrol PX-solubilized adenylate cyclase preparation from rabbit myocardial membrane. The kinetics of GS activation by purified beta-receptors occupied by l-isoproterenol was first order and activation was linearly dependent on receptor concentration.(ABSTRACT TRUNCATED AT 250 WORDS)
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Gal A, Braun S, Feder D, Levitzki A. Reconstitution of a functional beta-adrenergic receptor using cholate and a novel method for its functional assay. Eur J Biochem 1983; 134:391-6. [PMID: 6307696 DOI: 10.1111/j.1432-1033.1983.tb07580.x] [Citation(s) in RCA: 28] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Solubilization of purified turkey erythrocyte membranes at increasing cholate to protein ratios and in the presence of salt, extracts up to 20% of the beta-adrenergic receptor together with the GTP stimulatory protein (Ns) of adenylate cyclase. Upon removal of the cholate, by active absorption on Bio-beads, the functional interaction between the beta-receptor and the GTP regulatory protein Ns is quantitatively restored. The receptor (R) in the presence of l-isoproterenol and p[NH]ppG is able to catalyze the activation of Ns to its permanently active state, N's p[NH]ppG, with a rate constant (kon) identical to that of the native membrane. Reconstitution of the R/Ns mixture using poly(ethyleneglycol)-6000 restores the receptor binding properties as effectively as SM-2 Bio-beads. Unlike SM-2 Bio-beads, however, poly(ethyleneglycol) is not as efficient in restoring the R to Ns functional coupling. In this communication we also report on the ability to monitor quantitatively N's . p[NH]ppG, using native turkey erythrocyte membranes in the presence of Lubrol-PX as the source of the catalytic unit (c) of adenylate cyclase. The latter method is as efficient as using S49 AC- lymphoma cell membranes but much less expensive. Using this technique, we also demonstrate that when the Ns to C interaction is nullified, employing treatment with N-ethylmaleimide, the parameters which characterize R to Ns coupling remain unchanged.
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