1
|
Tofanello A, Miranda ÉA, Dias IWR, Lanfredi AJC, Arantes JT, Juliano M, Nantes IL. pH-Dependent Synthesis of Anisotropic Gold Nanostructures by Bioinspired Cysteine-Containing Peptides. ACS Omega 2016; 1:424-434. [PMID: 31457138 PMCID: PMC6640750 DOI: 10.1021/acsomega.6b00140] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2016] [Accepted: 09/06/2016] [Indexed: 05/28/2023]
Abstract
In the present study, alkaline peptides AAAXCX (X = lysine or arginine residues) were designed based on the conserved motif of the enzyme thioredoxin and used for the synthesis of gold nanoparticles (GNPs) in the pH range of 2-11. These peptides were compared with free cysteine, the counterpart acidic peptides AAAECE and γ-ECG (glutathione), and the neutral peptide AAAACA. The objective was to investigate the effect of the amino acids neighboring a cysteine residue on the pH-dependent synthesis of gold nanocrystals. Kohn-Sham density functional theory (KS-DFT) calculations indicated an increase in the reducing capacity of AAAKCK favored by the successive deprotonation of their ionizable groups at increasing pH values. Experimentally, it was observed that gold speciation and the peptide structure also have a strong influence on the synthesis and stabilization of GNPs. AAAKCK produced GNPs at room temperature, in the whole investigated pH range. By contrast, alkaline pH was the best condition for the synthesis of GNP assisted by the AAARCR peptide. The acidic peptides produced GNPs only in the presence of polyethylene glycol, and the synthesis using AAAECE and γ-ECG also required heating. The ionization state of AAAKCK had a strong influence on the preferential growth of the GNPs. Therefore, pH had a remarkable effect on the synthesis, kinetics, size, shape, and polydispersity of GNPs produced using AAAKCK. The AAAKCK peptide produced anisotropic decahedral and platelike nanocrystals at acidic pH values and spherical GNPs at alkaline pH values. Both alkaline peptides were also efficient capping agents for GNPs, but they produced a significant difference in the zeta potential, probably because of different orientations on the gold surface.
Collapse
Affiliation(s)
- Aryane Tofanello
- NanoBioMAv, Centro de Ciências Naturais e Humanas (CCNH) and Centro de Engenharia,
Modelagem e Ciências Sociais Aplicadas (CECS), Universidade Federal do ABC (UFABC), Avenida dos Estados 5001, Bairro Bangu, 09210-580 Santo André, São Paulo, Brazil
| | - Érica
G. A. Miranda
- NanoBioMAv, Centro de Ciências Naturais e Humanas (CCNH) and Centro de Engenharia,
Modelagem e Ciências Sociais Aplicadas (CECS), Universidade Federal do ABC (UFABC), Avenida dos Estados 5001, Bairro Bangu, 09210-580 Santo André, São Paulo, Brazil
| | - Igor W. R. Dias
- NanoBioMAv, Centro de Ciências Naturais e Humanas (CCNH) and Centro de Engenharia,
Modelagem e Ciências Sociais Aplicadas (CECS), Universidade Federal do ABC (UFABC), Avenida dos Estados 5001, Bairro Bangu, 09210-580 Santo André, São Paulo, Brazil
| | - Alexandre J. C. Lanfredi
- NanoBioMAv, Centro de Ciências Naturais e Humanas (CCNH) and Centro de Engenharia,
Modelagem e Ciências Sociais Aplicadas (CECS), Universidade Federal do ABC (UFABC), Avenida dos Estados 5001, Bairro Bangu, 09210-580 Santo André, São Paulo, Brazil
| | - Jeverson T. Arantes
- NanoBioMAv, Centro de Ciências Naturais e Humanas (CCNH) and Centro de Engenharia,
Modelagem e Ciências Sociais Aplicadas (CECS), Universidade Federal do ABC (UFABC), Avenida dos Estados 5001, Bairro Bangu, 09210-580 Santo André, São Paulo, Brazil
| | - Maria
A. Juliano
- Departamento
de Biologia Molecular, Universidade Federal
de São Paulo, Rua 3 de Maio 100, Vila Clementino, 04044-020 São Paulo, São Paulo, Brazil
| | - Iseli L. Nantes
- NanoBioMAv, Centro de Ciências Naturais e Humanas (CCNH) and Centro de Engenharia,
Modelagem e Ciências Sociais Aplicadas (CECS), Universidade Federal do ABC (UFABC), Avenida dos Estados 5001, Bairro Bangu, 09210-580 Santo André, São Paulo, Brazil
| |
Collapse
|
2
|
Sauter B, Dabulis S, Juliano M. 58: Fetal Outcomes in First Trimester Symptomatic Pregnancies Presenting to an Emergency Department With Indeterminate Ultrasound. Ann Emerg Med 2008. [DOI: 10.1016/j.annemergmed.2008.06.124] [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: 11/16/2022]
|
3
|
Juliano M, Dabulis S, Heffner A. Fetal Loss in Symptomatic First Trimester Pregnancies with Documented Fetal Cardiac Activity. Acad Emerg Med 2007. [DOI: 10.1197/j.aem.2007.03.1242] [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: 11/10/2022]
|
4
|
Naghettini AV, Nogueira PC, Juliano M, Bueno AA, Casarini DE, de Abreu Carvalhaes JT. Tubular urinary enzymes in acute post-infectious glomerulonephritis. Pediatr Nephrol 2001; 16:719-22. [PMID: 11511985 DOI: 10.1007/s004670100643] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/31/2000] [Accepted: 04/27/2001] [Indexed: 11/28/2022]
Abstract
Tubular function of 17 pediatric patients with a mild form of acute post-infectious glomerulonephritis was prospectively evaluated by assessment of the urinary activity of proximal and distal tubule enzymes. Neutral-like endopeptidase (NEP-like) and angiotensin-converting enzyme (ACE) were the proximal tubule enzymes assessed, while prolyl-endopeptidase (PE) and serine-endopeptidase H1 and H2 were the distal tubule enzymes analyzed. Urine was collected at diagnosis (T0) and after 2 (T2) and 6 (T6) months of follow-up. NEP-like enzyme activity (nmol/mg creatinine; median+/-quartile range) was increased at diagnosis, and this remained stable during the first 6 months (T0 18.30+/-83.26, T2 17.32+/-49.56, T6 23.38+/-107.18). Urinary activity of the other enzymes was as follows: ACE (mU/ml per mg creatinine) T0 0.08+/-0.16, T2 0.06+/-0.10, T6 0.18+/-0.29; PE (nmol/mg creatinine) T0 6.70+/-84.87, T2 9.55+/-69.00, T6 13.67+/-28.70; serine-endopeptidase H1 (nmol/mg creatinine) T0 7.86+/-26.95, T2 17.17+/-59.37, T6 18.19+/- 79.14; and serine-thiol-endopeptidase H2 (nmol/mg creatinine) T0 3.06+/-21.97, T2 12.06+/-32.42, T6 16.22+/- 44.06. Thirty other healthy children matched for age and gender were considered as a control group. This group was assessed once and the results were: NEP-like activity 6.05+/-10.54, ACE 0.11+/-0.22, PE 7.10+/-13.36, H1 5.00+/-17.30, and H2 6.00+/-20.16. In conclusion, we observed that NEP-like and H1 enzymes exhibited significant increased urinary activity 6 months after the diagnosis. This increase occurred in spite of the disappearance of clinical symptoms, which occurred 2 months after the diagnosis. We believe that the increase in urinary enzymatic activity could be a manifestation of a silent tubular dysfunction following an episode of acute post-infectious glomerulonephritis.
Collapse
Affiliation(s)
- A V Naghettini
- Pediatric Nephrology Unit, Department of Pediatrics, Escola Paulista de Medicina, UNIFESP, São Paulo, Brazil. naghetti@ terra.com.br
| | | | | | | | | | | |
Collapse
|
5
|
Bourguignon S, Paes F, Calheiros E, Juliano M, Aguiar A, Melgarejo A, Giovanni-De-Simone S. Bothrops Moojeni Venom Peptides Containing Bradykinin Potentiating Peptides Sequences. Protein Pept Lett 2001. [DOI: 10.2174/0929866013409689] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
6
|
Coburn CA, Rush DM, Williams PD, Homnick C, Lyle EA, Lewis SD, Lucas BJ, Di Muzio-Mower JM, Juliano M, Krueger JA, Vastag K, Chen IW, Vacca JP. Bicyclic pyridones as potent, efficacious and orally bioavailable thrombin inhibitors. Bioorg Med Chem Lett 2000; 10:1069-72. [PMID: 10843219 DOI: 10.1016/s0960-894x(00)00170-0] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [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: 11/18/2022]
Abstract
A new class of conformationally constrained thrombin inhibitors is described. These compounds contain a unique bicyclic pyridone scaffold which serves as a P3P2 dipeptide surrogate. The synthesis and antithrombotic activity of these inhibitors is reported.
Collapse
Affiliation(s)
- C A Coburn
- Department of Medicinal Chemistry, Merck Research Laboratories, West Point, PA 19486, USA.
| | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
7
|
Oliva ML, Andrade SA, Batista IF, Sampaio MU, Juliano M, Fritz H, Auerswald EA, Sampaio CA. Human plasma kallikrein and tissue kallikrein binding to a substrate based on the reactive site of a factor Xa inhibitor isolated from Bauhinia ungulata seeds. Immunopharmacology 1999; 45:145-9. [PMID: 10615004 DOI: 10.1016/s0162-3109(99)00146-0] [Citation(s) in RCA: 26] [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] [Indexed: 11/24/2022]
Abstract
Kunitz type Bauhinia ungulata factor Xa inhibitor (BuXI) was purified from B. ungulata seeds. BuXI inactivates factor Xa and human plasma kallikrein (HuPK) with Ki values of 18.4 and 6.9 nM, respectively. However, Bauhinia variegata trypsin inhibitor (BvTI) which is 70% homologous to BuXI does not inhibit factor Xa and is less efficient on HuPK (Ki = 80 nM). The comparison between BuXI and BvTI reactive site structure indicates differences at Met59, Thr66 and Met67 residues. The hydrolysis rate of quenched fluorescence peptide substrates based on BuXI reactive site sequence, Abz-VMIAALPRTMFIQ-EDDnp (leading peptide), by HuPK and porcine pancreatic kallikrein (PoPK) is low, but hydrolysis is enhanced with Abz-VMIAALPRTMQ-EDDnp, derived from the leading peptide shortened by removing the dipeptide Phe-Ileu from the C-terminal portion, for HuPK (Km = 0.68 microM, k(cat)/Km = 1.3 x 10(6) M(-1) s(-1)), and the shorter substrate Abz-LPRTMQ-EDDnp is better for PoPK (Km = 0.66 microM, k(cat)/Km = 2.2 x 10(3) M(-1) s(-1)). The contribution of substrate methionine residues to HuPK and PoPK hydrolysis differs from that observed with factor Xa. The determined Km and k(cat) values suggest that the substrates interact with kallikreins the same as an enzyme and inhibitor interacts to form complexes.
Collapse
Affiliation(s)
- M L Oliva
- Departamento de Bioquímica, Universidade Federal de São Paulo-Escola Paulista de Medicina, UNIFESP, SP, Brazil
| | | | | | | | | | | | | | | |
Collapse
|
8
|
Quinto BM, Juliano L, Juliano M, Carmona AK, Stella RC, Casarini DE. Characterization of a kinin inactivating serine endopeptidase H2 (kininase) from human urine using fluorogenic substrates. Immunopharmacology 1999; 45:223-8. [PMID: 10615015 DOI: 10.1016/s0162-3109(99)00081-8] [Citation(s) in RCA: 4] [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] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We have previously described a kinin-inactivating endopeptidase (H2), which was purified 19-fold from human urine by DEAE-cellulose chromatography and gel filtration. The enzyme was inhibited 100% by PMSF, TPCK and pOHMB. In the present communication, we further characterized this enzyme using the fluorogenic substrates Abz-RPPGFSPFRQ-EDDnp (Abz-BKQ-EDDnp) and Abz-FRQ-EDDnp (Abz = ortho-aminobenzoic acid; EDDnp = N-[2,4-dinitrophenyl] ethylenediamine). Also a rapid, sensitive and specific assay for the H2 was developed. The enzyme hydrolyzed bradykinin (BK = RPPGFSPFR) at the F-S peptide bond, differing from the cleavage site F-R, in the fluorogenic substrates Abz-BKQ-EDDnp and Abz-FRQ-EDDnp. Other enzymes present in urine as the serine endopeptidase H1, prolyl endopeptidase and neutral endopeptidase-like were not able to hydrolyze the related substrate Abz-FRQ-EDDnp. The determined Km for Abz-BKQ-EDDnp and Abz-FRQ-EDDnp were 0.79 microM and 3.02 microM, respectively. Using the fluorogenic substrates, we observed that PMSF and p-hydroxymercuribenzoate irreversibly inhibited the enzyme H2. E-64 was a weak and reversible inhibitor, whereas EDTA and pepstatin were not inhibitory. The inhibition observed in the presence of pOHMB was partially reversed by 2 mM cysteine. These results suggest that the H2 enzyme belongs to the subfamily of SH-containing serine proteases. Based on the molecular weight of isolated H2 (60 kDa), we believe that this enzyme originated from the kidney and may cleave the kinins filtered through the glomerulus and also that produced in the kidney.
Collapse
Affiliation(s)
- B M Quinto
- Depto. de Medicina, Escola Paulista de Medicina, Universidade Federal de São Paulo, SP, Brazil
| | | | | | | | | | | |
Collapse
|
9
|
Di Marco GS, Quinto BM, Juliano M, Carmona AK, Stella RC, Plavnik FL, Casarini DE. Purification and characterization of a neutral endopeptidase-like enzyme from human urine. J Hypertens 1998; 16:1971-8. [PMID: 9886885 DOI: 10.1097/00004872-199816121-00018] [Citation(s) in RCA: 6] [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: 11/25/2022]
Abstract
OBJECTIVE The aims of this study were to purify and characterize a neutral endopeptidase-like enzyme (NEP-like) in human urine and propose a rapid, sensitive and specific assay for this enzyme using the fluorogenic substrate Abz-FDQ-EDDnp, where Abz = O-aminobenzoic acid and EDDnp = N-(2,4-dinitrophenyl)ethylenediamine. METHODS Soluble urinary NEP was purified from human urine using a DEAE-cellulose Cellex D column and gel filtration on an AcA-44 column. NEP-like activity was assayed by its ability to hydrolyse bradykinin (BK) and the fluorogenic substrates Abz-BKQ-EDDnp and Abz-FDQ-EDDnp. The Km was determined using Abz-FDQ-EDDnp as a substrate. The hydrolysis products of BK and Abz-FDQ-EDDnp were analysed by high-performance liquid chromatography (HPLC). The mol. wt was estimated by polyacrylamide gel electrophoresis and the enzyme analysed by Western blot using the antibody obtained from purified recombinant NEP expressed in Pichia pastoris yeast. RESULTS The NEP-like was purified from human urine until homogeneity and presented a mol. wt of 94000. The substrate Abz-FDQ-EDDnp was selectively hydrolysed at the F-D bond by NEP-like and by recombinant NEP. For this substrate, the NEP-like activity was maximal at pH 7.0, although a small peak of activity was observed at pH 8.0, and the determined Km was 14 microM. The enzymatic activity was inhibited by thiorphan and phosphoramidon. In Western blot analysis, NEP-like reacted strongly with a polyclonal antibody for NEP. CONCLUSION A NEP-like enzyme was purified from human urine. Based on the mol. wt of the isolated NEP-like enzyme, it was concluded that this enzyme was produced in the kidney. In the kidney, this enzyme may cleave the kinins filtered through the glomerulus and also the kinins produced in the distal nephron. An internally quenched fluorogenic peptide, Abz-FDQ-EDDnp, was selectively hydrolysed by NEP-like and by recombinant NEP.
Collapse
Affiliation(s)
- G S Di Marco
- Department of Medicine, EPM, UNIFESP, São Paulo, SP, Brazil
| | | | | | | | | | | | | |
Collapse
|
10
|
De Sarro A, Ammendola D, Juliano M, Gareri P, De Sarro G. Only some anticonvulsants protect against seizures induced by aminophylline in quinolone-treated genetically epilepsy prone rats. Gen Pharmacol 1993; 24:1393-401. [PMID: 8112511 DOI: 10.1016/0306-3623(93)90425-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
1. The effects of some anticonvulsant drugs against seizures induced by a combined treatment with aminophylline and quinolone in genetically epilepsy-prone rat have been investigated. 2. Animals were intraperitoneally pretreated with carbamazepine, diazepam, phenobarbital, CPPene and dizocilpine or saline and 15 min later administered orally with 51.86 mumol/kg b. wt of either cinoxacin or ciprofloxacin. 60 min after quinolones, rats received intraperitoneally aminophylline (100, 120, 140, 160 or 180 mg/kg b. wt). 3. Ciprofloxacin showed to be more effective than cinoxacin in potentiating the aminophylline convulsant effects. 4. Neither carbamazepine nor diazepam and phenobarbital, at the lowest dose used, elicited any effect in reducing the aminophylline-induced seizures in both cinoxacin- and ciprofloxacin-treated animals. Whereas, diazepam and phenobarbital when administered i.p. at 2.5 and 60 mg/kg b. wt respectively demonstrated protective properties. 5. CPPene and dizocilpine, two excitatory amino acid antagonists, were both very effective in antagonizing the seizures produced by concomitant treatment with cinoxacin or ciprofloxacin plus aminophylline. 6. The present results suggest an involvement of the excitatory amino acid receptors in mediating the seizures induced by the combined treatment with quinolones and aminophylline.
Collapse
Affiliation(s)
- A De Sarro
- Institute of Pharmacology, School of Medicine, Italy
| | | | | | | | | |
Collapse
|
11
|
De Sarro GB, Rotiroti D, Gratteri S, Sinopoli S, Juliano M, De Sarro A. Tolerance to anticonvulsant effects of clobazam, diazepam, and clonazepam in genetically epilepsy prone rats. Adv Biochem Psychopharmacol 1992; 47:249-54. [PMID: 1354917] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 03/25/2023]
Affiliation(s)
- G B De Sarro
- Department of Experimental Medicine, Faculty of Medicine, University of Reggio Calabria, Catanzaro, Italy
| | | | | | | | | | | |
Collapse
|
12
|
Masella L, Imparato A, Juliano M, Marzano D, Maio G, Conte MP. [Hypotension controlled with isoflurane in neurosurgery]. Minerva Anestesiol 1987; 53:203-5. [PMID: 3438009] [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: 01/05/2023]
|