Conversion to renin of exogenously administered recombinant human prorenin in liver and kidney of monkeys

1990 ◽  
Vol 258 (3) ◽  
pp. E451-E458
Author(s):  
S. Kim ◽  
M. Hosoi ◽  
F. Ikemoto ◽  
K. Murakami ◽  
Y. Ishizuka ◽  
...  
Keyword(s):  
Blood Circulation ◽  
High Performance ◽  
Slow Component ◽  
Polyacrylamide Gel Electrophoresis ◽  
Sodium Dodecyl ◽  
Gel Permeation ◽  
Liver And Kidney ◽  
The Brain ◽  
No Activation

Highly purified recombinant human prorenin, labeled with 125I (125I-prorenin), was intravenously given to monkeys to examine the possible in vivo conversion of this prorenin to renin. 125I-prorenin and 125I-renin were detected using specific anti-prorenin prosegment antibody and anti-renin antibody, respectively. The plasma disappearance of immunoreactive 125I-prorenin in marmosets showed two exponential components with a half-life of 10.4 +/- 0.2 min for the rapid component and 165.7 +/- 12.6 min for the slow component. Fifteen minutes after the injection of 125I-prorenin, 38.7 +/- 2.8 and 3.9 +/- 0.5% of the administered dose accumulated in the liver and kidney, respectively. Less than 1% of the dose injected distributed in the other organs, including the brain, submandibular gland, lung, heart, aorta, adrenal gland, spleen, uterus, ovary, and testis. Thus the labeled prorenin was predominantly taken up by the liver and kidney. Analysis of liver and kidney extracts and plasma, by both gel permeation high-performance liquid chromatography and sodium dodecyl sulfate-polyacrylamide gel electrophoresis, demonstrated that 125I-prorenin (Mr = 46,000) taken up by the liver and kidney was significantly converted to 125I-renin (Mr = 42,000), whereas only a negligible amount of 125I-renin (Mr = 42,000) was present in the plasma. Although there seems to be no activation of prorenin in the blood circulation, prorenin does seem to be activated by the liver and kidney.

Purification and Characterization of Virginiamycin M1 Reductase from Streptomyces virginiae

1998 ◽  
Vol 42 (11) ◽  
pp. 2985-2988 ◽  
Author(s):  
Naoyoshi Suzuki ◽  
Chang-Kwon Lee ◽  
Takuya Nihira ◽  
Yasuhiro Yamada
Keyword(s):  
High Performance ◽  
Reaction Rate ◽  
Polyacrylamide Gel Electrophoresis ◽  
Sodium Dodecyl ◽  
Purification And Characterization ◽  
Streptomyces Virginiae ◽  
Virginiamycin M1 ◽  
Terminal Amino

ABSTRACT Virginiamycin M1 (VM1), produced byStreptomyces virginiae, is a polyunsaturated macrocyclic lactone antibiotic belonging to the virginiamycin A group.S. virginiae possesses an activity which stereospecifically reduces a 16-carbonyl group of VM1, resulting in antibiotically inactive 16R-dihydroVM1. The corresponding VM1 reductase was purified to homogeneity from crude extracts of S. virginiae in five steps, with 5,650-fold purification and 23% overall yield. The N-terminal amino acid sequence was determined to be MAIKLVIA. The purified enzyme showed an apparent M r of 73,000 by sodium dodecyl sulfate-polyacrylamide gel electrophoresis and anM r of 280,000 by native molecular sieve high-performance liquid chromatography, indicating the tetrameric nature of the native enzyme. NADPH served as a coenzyme for the reduction, with a Km value of 0.13 mM, but NADH did not support the reaction, even at a concentration of 5 mM, indicating the NADPH-specific nature of the enzyme. TheKm for VM1 was determined to be 1.5 mM in the presence of 2 mM NADPH. In the reverse reaction, only 16R-dihydroVM1, not the 16S-epimer, served as a substrate, with a less than 0.1% overall reaction rate compared to that of the forward reaction, confirming that the VM1 reductase participates solely in VM1 inactivation in vivo.

scholarly journals Biodistribution and Anticancer Characteristics of Les-3833, A Novel 4-thiazolidinone-Based Lead Compound

2020 ◽  
Vol 88 (2) ◽  
pp. 18 ◽  
Author(s):  
Lesya Kobylinska ◽  
Andrii Lozynskii ◽  
Roman Lesyk ◽  
Rostyslav Stoika ◽  
Sandor G. Vari
Keyword(s):  
Maximum Concentration ◽  
High Performance ◽  
Maximum Level ◽  
Lead Compound ◽  
Short Period ◽  
Liquid Chromatography Tandem Mass ◽  
Liver And Kidney ◽  
The Brain

Recently, we identified the promising anticancer potential of the synthetic 4-thiazolidinone-based anticancer lead compound Les-3833 which demonstrated tumor-suppressing action in vitro and in vivo. Based on the results of previous studies, the aim of this research was to investigate the cytotoxicity in vitro and the biodistribution in laboratory mice to support the biotherapeutic drug development of Les-3833. Les-3833 (2.5 mg/kg) was intravenously injected into male Balb/c mice. Measurements were performed at 5 min, 15 min, 1 h, 4 h, and 24 h time points in blood plasma, brain, liver, and kidney using high-performance liquid chromatography/tandem mass spectrometry. After the administration of Les-3833, the maximum level of this compound was observed in plasma at 2.08 min. In the brain, the mean maximum concentration of Les-3833 was 7.17 ng/mL at 5 min, while after 15 min, it was not found. In the liver, at 5 min, the maximum concentration was 1190 ng/g. At 15 min, concentration of Les-3833 in the liver decreased by 14.3%; at 6 h by 22.8%; and after 24 h by 64.7%. Its maximum concentration in kidney was 404 ng/g within 5–15 min, at 1 h it decreased by 36.1%, and after 24 h by 49.3%. Thus, Les-3833 was rapidly taken up by different organs from the bloodstream, partially metabolized in the liver, and excreted mainly through the kidneys, while in the brain, a very low concentration could be observed for only a short period of time.

Purification and the effect of peptide N-glycosidase F on lysosomal membrane-bound glucocerebrosidase from human cultured fibroblasts

1991 ◽  
Vol 69 (8) ◽  
pp. 551-556 ◽  
Author(s):  
Francis Y. M. Choy ◽  
Mary Woo
Keyword(s):  
Molecular Weight ◽  
High Performance ◽  
Polyacrylamide Gel Electrophoresis ◽  
Sodium Dodecyl ◽  
Dermal Fibroblasts ◽  
Cultured Fibroblasts ◽  
Apparent Homogeneity ◽  
Gel Permeation ◽  
Catalytically Active ◽  
Total Molecular Weight

Glucocerebrosidase was purified from human cultured dermal fibroblasts more than 2200-fold to apparent homogeneity using high performance Alkyl-Superose HR 5/5 hydrophobic interaction and Bio-Sil TSK-250 gel permeation column chromatography. Sodium dodecyl sulfate – polyacrylamide gel electrophoresis and protein staining of the catalytically active and concentrated enzyme fractions from the gel permeation columns revealed the presence of one band of Mr 64 000. The glucocerebrosidase preparation purified to homogeneity was digested with peptide N-glycosidase F that cleaves N-linked oligosaccharide structures from glycoproteins. The molecular weight of glucocerebrosidase after digestion with peptide N-glycosidase F was reduced to Mr 57 000, suggesting that the mature enzyme is a glycoprotein and that N-linked oligosaccharide constitutes a minimum of about 10% of the total molecular weight of the polypeptide. These findings are compatible with the hypothesis that glucocerebrosidase was initially synthesized as a precursor polypeptide which was subsequently glycosylated to become the mature enzyme.Key words: glucocerebrosidase, purification, deglycosylation, N-glycosidase F, fibroblasts.

scholarly journals A novel PET tracer 18F-deoxy-thiamine: synthesis, metabolic kinetics, and evaluation on cerebral thiamine metabolism status

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Changpeng Wang ◽  
Siwei Zhang ◽  
Yuefei Zou ◽  
Hongzhao Ma ◽  
Donglang Jiang ◽  
...  
Keyword(s):  
High Performance ◽  
Specific Activity ◽  
High Accumulation ◽  
Metabolic Kinetics ◽  
Thiamine Metabolism ◽  
Pet Tracer ◽  
The Status ◽  
The Brain

Abstract Background Some neuropsychological diseases are associated with abnormal thiamine metabolism, including Korsakoff–Wernicke syndrome and Alzheimer’s disease. However, in vivo detection of the status of brain thiamine metabolism is still unavailable and needs to be developed. Methods A novel PET tracer of 18F-deoxy-thiamine was synthesized using an automated module via a two-step route. The main quality control parameters, such as specific activity and radiochemical purity, were evaluated by high-performance liquid chromatography (HPLC). Radiochemical concentration was determined by radioactivity calibrator. Metabolic kinetics and the level of 18F-deoxy-thiamine in brains of mice and marmosets were studied by micro-positron emission tomography/computed tomography (PET/CT). In vivo stability, renal excretion rate, and biodistribution of 18F-deoxy-thiamine in the mice were assayed using HPLC and γ-counter, respectively. Also, the correlation between the retention of cerebral 18F-deoxy-thiamine in 60 min after injection as represented by the area under the curve (AUC) and blood thiamine levels was investigated. Results The 18F-deoxy-thiamine was stable both in vitro and in vivo. The uptake and clearance of 18F-deoxy-thiamine were quick in the mice. It reached the max standard uptake value (SUVmax) of 4.61 ± 0.53 in the liver within 1 min, 18.67 ± 7.04 in the kidney within half a minute. The SUV dropped to 0.72 ± 0.05 and 0.77 ± 0.35 after 60 min of injection in the liver and kidney, respectively. After injection, kidney, liver, and pancreas exhibited high accumulation level of 18F-deoxy-thiamine, while brain, muscle, fat, and gonad showed low accumulation concentration, consistent with previous reports on thiamine distribution in mice. Within 90 min after injection, the level of 18F-deoxy-thiamine in the brain of C57BL/6 mice with thiamine deficiency (TD) was 1.9 times higher than that in control mice, and was 3.1 times higher in ICR mice with TD than that in control mice. The AUC of the tracer in the brain of marmosets within 60 min was 29.33 ± 5.15 and negatively correlated with blood thiamine diphosphate levels (r = − 0.985, p = 0.015). Conclusion The 18F-deoxy-thiamine meets the requirements for ideal PET tracer for in vivo detecting the status of cerebral thiamine metabolism.

Glycogen phosphorylase in fish muscle: demonstration of three interconvertible forms

1990 ◽  
Vol 258 (2) ◽  
pp. C344-C351 ◽  
Author(s):  
H. Schmidt ◽  
G. Wegener
Keyword(s):  
Glycogen Phosphorylase ◽  
Specific Activity ◽  
Polyacrylamide Gel Electrophoresis ◽  
Sodium Dodecyl ◽  
Muscular Activity ◽  
Fish Muscle ◽  
Kinetic Properties ◽  
Phosphorylase Activity ◽  
Tissue Extracts

White skeletal muscle of crucian carp contains a single isoenzyme of glycogen phosphorylase, which was purified approximately 300-fold to a specific activity of approximately 13 mumol.min-1.mg protein-1 (assayed in the direction of glycogen breakdown at 25 degrees C). Tissue extracts of crucian muscle produced three distinct peaks of phosphorylase activity when separated on DEAE-Sephacel. Peaks 1 and 3 were identified, in terms of kinetic properties and by interconversion experiments, as phosphorylase b and a, respectively. Peak 2 was shown to be a phospho-dephospho hybrid. The three interconvertible forms of phosphorylase were purified and shown to be dimeric molecules at 20 degrees C. At 5 degrees C, a and the hybrid tended to form tetramers. The Mr of the subunit was estimated to be 96,400 from sodium dodecyl sulfate-polyacrylamide gel electrophoresis. The hybrid is kinetically homogeneous, and its kinetic properties are intermediate between those of b and a forms. The b, hybrid, and a forms of phosphorylase can be isolated from rapidly frozen muscle of crucian but in different proportions, depending on whether fish were anesthetized or forced to muscular activity for 20 s. Muscle of anesthetized crucian had 36, 36, and 28% of phosphorylase b, hybrid, and a forms, respectively, whereas the corresponding values for exercised fish were 12, 37, and 51%. Results suggest that three interconvertible forms of phosphorylase exist simultaneously in crucian muscle and that hybrid phosphorylase is active in contracting muscle in vivo.

scholarly journals The Potential Roles of Blood–Brain Barrier and Blood–Cerebrospinal Fluid Barrier in Maintaining Brain Manganese Homeostasis

Nutrients ◽  
2021 ◽  
Vol 13 (6) ◽  
pp. 1833
Author(s):  
Shannon Morgan McCabe ◽  
Ningning Zhao
Keyword(s):  
Cerebrospinal Fluid ◽  
Blood Brain Barrier ◽  
Blood Circulation ◽  
Critical Role ◽  
Systemic Circulation ◽  
Brain Parenchyma ◽  
Brain Barrier ◽  
Blood Brain ◽  
The Brain

Manganese (Mn) is a trace nutrient necessary for life but becomes neurotoxic at high concentrations in the brain. The brain is a “privileged” organ that is separated from systemic blood circulation mainly by two barriers. Endothelial cells within the brain form tight junctions and act as the blood–brain barrier (BBB), which physically separates circulating blood from the brain parenchyma. Between the blood and the cerebrospinal fluid (CSF) is the choroid plexus (CP), which is a tissue that acts as the blood–CSF barrier (BCB). Pharmaceuticals, proteins, and metals in the systemic circulation are unable to reach the brain and spinal cord unless transported through either of the two brain barriers. The BBB and the BCB consist of tightly connected cells that fulfill the critical role of neuroprotection and control the exchange of materials between the brain environment and blood circulation. Many recent publications provide insights into Mn transport in vivo or in cell models. In this review, we will focus on the current research regarding Mn metabolism in the brain and discuss the potential roles of the BBB and BCB in maintaining brain Mn homeostasis.

Study on Degradation of Radix Isatidis Polypeptide in Artificial Gastrointestinal Environment

2014 ◽  
Vol 989-994 ◽  
pp. 1020-1024
Author(s):  
Nan Nan ◽  
Xi Jing Liu
Keyword(s):  
Gel Electrophoresis ◽  
Free Amino ◽  
High Performance ◽  
Polyacrylamide Gel Electrophoresis ◽  
Sodium Dodecyl ◽  
Radix Isatidis ◽  
Sds Page ◽  
Electrophoresis Method ◽  
Amino Acid Levels ◽  
Different Molecular Weight

Radix Isatidis is a traditional Chinese medicine for treatment of influenza and inflammation in China. In this paper, in order to study the degradation situation of Radix Isatidis polypeptide in artificial gastrointestinal environment, the SDS-PAGE (Sodium dodecyl sulfate-polyacrylamide gel electrophoresis) method was used to detect the degradation of Radix Isatidis polypeptide in artificial intestinal juice and gastric juice, and it showed that Radix Isatidis peptides could be degradated to different degrees. HPLC (High Performance Liquid Chromatography) was used to determine the change of peptides degradation, and it indicated that free amino acid levels did not change significantly. The result after degradation was also detected by BCA method, and it showed that there were still a large number of polypeptides in the liquid. From this experiment we can come to this conclusion that Radix Isatidis polypeptides in artificial gastrointestinal juice mostly degraded into a series of different molecular weight peptides.

scholarly journals Isolation and Characterization of Two Proteins fromMoraxella catarrhalis That Bear a Common Epitope

1998 ◽  
Vol 66 (9) ◽  
pp. 4374-4381 ◽  
Author(s):  
John C. McMichael ◽  
Michael J. Fiske ◽  
Ross A. Fredenburg ◽  
Deb N. Chakravarti ◽  
Karl R. VanDerMeid ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Polyacrylamide Gel Electrophoresis ◽  
Sodium Dodecyl ◽  
Gel Filtration ◽  
Bacterial Attachment ◽  
Vaccine Candidates ◽  
Isolation And Characterization ◽  
Sds Page

ABSTRACT The UspA1 and UspA2 proteins of Moraxella catarrhalisare potential vaccine candidates for preventing disease caused by this organism. We have characterized both proteins and evaluated their vaccine potential using both in vitro and in vivo assays. Both proteins were purified from the O35E isolate by Triton X-100 extraction, followed by ion-exchange and hydroxyapatite chromatography. Analysis of the sequences of internal peptides, prepared by enzymatic and chemical cleavage of the proteins, revealed that UspA1 and UspA2 exhibited distinct structural differences but shared a common sequence including an epitope recognized by the monoclonal antibody 17C7. By sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE), purified UspA1 exhibited a molecular weight of approximately 350,000 when unheated and a molecular weight of 100,000 after being heated for 10 min at 100°C. In contrast, purified UspA2 exhibited an apparent molecular weight of 240,000 by SDS-PAGE that did not change with the length of time of heating. Their sizes as determined by gel filtration were 1,150,000 and 830,000 for UspA1 and UspA2, respectively. Preliminary results indicate the proteins have separate functions in bacterial pathogenesis. Purified UspA1 was found to bind HEp-2 cells, and sera against UspA1, but not against UspA2, blocked binding of the O35E isolate to the HEp-2 cells. UspA1 also bound fibronectin and appears to have a role in bacterial attachment. Purified UspA2, however, did not bind fibronectin but had an affinity for vitronectin. Both proteins elicited bactericidal antibodies in mice to homologous and heterologous disease isolates. Finally, mice immunized with each of the proteins, followed by pulmonary challenge with either the homologous or a heterologous isolate, cleared the bacteria more rapidly than mock-immunized mice. These results suggest that UspA1 and UspA2 serve different virulence functions and that both are promising vaccine candidates.

scholarly journals Characterization of proteins from the cytoskeleton of Giardia lamblia

1983 ◽  
Vol 59 (1) ◽  
pp. 81-103 ◽  
Author(s):  
R. Crossley ◽  
D.V. Holberton
Keyword(s):  
Molecular Weight ◽  
Sodium Dodecyl Sulphate ◽  
Giardia Lamblia ◽  
Polyacrylamide Gel Electrophoresis ◽  
Sodium Dodecyl ◽  
Gel Filtration ◽  
Molecular Size ◽  
Molecular Weights

Proteins from the axonemes and disc cytoskeleton of Giardia lamblia have been examined by sodium dodecyl sulphate/polyacrylamide gel electrophoresis. In addition to tubulin and the 30 X 10(3) molecular weight disc protein, at least 18 minor components copurify with the two major proteins in Triton-insoluble structures. The most prominent minor bands have the apparent molecular weights of 110 X 10(3), 95 X 10(3) and 81 X 10(3). Protein of 30 X 10(3) molecular weight accounts for about 20% of organelle protein on gels. In continuous 25 mM-Tris-glycine buffer it migrates mostly as a close-spaced doublet of polypeptides, which are here given the name giardins. Giardia tubulin and giardin have been purified by gel filtration chromatography in the presence of sodium dodecyl sulphate. Well-separated fractions were obtained that could be further characterized. Both proteins are heterogeneous when examined by isoelectric focusing. Five tubulin chains were detected by PAGE Blue 83 dye-binding after focusing in a broad-range ampholyte gel. Giardin is slightly less acidic than tubulin. On gels it splits into four major and four minor chains with isoelectric points in the pI range from 5.8 to 6.2. The amino acid composition of the giardin fraction has been determined, and compared to Giardia tubulin and a rat brain tubulin standard. Giardins are rich in helix-forming residues, particularly leucine. They have a low content of proline and glycine; therefore they may have extensive alpha-helical regions and be rod-shaped. As integral proteins of disc microribbons, giardins in vivo associate closely with tubulin. The properties of giardins indicate that in a number of respects - molecular size, charge, stoichiometry - their structural interaction with tubulin assemblies will be different from other tubulin-accessory protein copolymers studied in vitro.

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