A semantically complete extension sequence of the system L*

2003 ◽  
Vol 46 (2) ◽  
pp. 81
Author(s):  
Daowu PEI
Keyword(s):  
Complete Extension ◽  
System L ◽  
Extension Sequence

Imbalance in the system L-arginin-NO in pathogenesis of obstetric complications and intrauterine growth retardation (Literature review)

2016 ◽  
pp. 43-47
Author(s):  
O.V. Basystyi ◽  
Keyword(s):  
Nitric Oxide ◽  
Literature Review ◽  
Growth Retardation ◽  
Intrauterine Growth Retardation ◽  
Obstetric Complications ◽  
Pathogenetic Role ◽  
Intrauterine Growth ◽  
System L ◽  
Nitric Oxide Deficiency

The data of domestic and foreign literature on etiology, pathogenesis and intrauterine growth retardation diagnosis are presented in the paper. It highlights pathogenetic role of nitric oxide deficiency in case of obstetric complications and intrauterine growth retardation. Key words: intrauterine growth retardation (IUGR), system L-arginin–NO, obstetric complications.

scholarly journals PSMA-D4 Radioligand for Targeted Therapy of Prostate Cancer: Synthesis, Characteristics and Preliminary Assessment of Biological Properties

2021 ◽  
Vol 22 (5) ◽  
pp. 2731
Author(s):  
Piotr Garnuszek ◽  
Urszula Karczmarczyk ◽  
Michał Maurin ◽  
Arkadiusz Sikora ◽  
Jolanta Zaborniak ◽  
...  
Keyword(s):  
Prostate Cancer ◽  
Targeted Therapy ◽  
Ex Vivo ◽  
Specific Binding ◽  
Biological Evaluation ◽  
In Vitro Assays ◽  
The Novel ◽  
Distribution Profile ◽  
System L

A new PSMA ligand (PSMA-D4) containing the Glu-CO-Lys pharmacophore connected with a new linker system (L-Trp-4-Amc) and chelator DOTA was developed for radiolabeling with therapeutic radionuclides. Herein we describe the synthesis, radiolabeling, and preliminary biological evaluation of the novel PSMA-D4 ligand. Synthesized PSMA-D4 was characterized using TOF-ESI-MS, NMR, and HPLC methods. The novel compound was subject to molecular modeling with GCP-II to compare its binding mode to analogous reference compounds. The radiolabeling efficiency of PSMA-D4 with 177Lu, 90Y, 47Sc, and 225Ac was chromatographically tested. In vitro studies were carried out in PSMA-positive LNCaP tumor cells membranes. The ex vivo tissue distribution profile of the radioligands and Cerenkov luminescence imaging (CLI) was studied in LNCaP tumor-bearing mice. PSMA-D4 was synthesized in 24% yield and purity >97%. The radio complexes were obtained with high yields (>97%) and molar activity ranging from 0.11 to 17.2 GBq mcmol−1, depending on the radionuclide. In vitro assays confirmed high specific binding and affinity for all radiocomplexes. Biodistribution and imaging studies revealed high accumulation in LNCaP tumor xenografts and rapid clearance of radiocomplexes from blood and non-target tissues. These render PSMA-D4 a promising ligand for targeted therapy of prostate cancer (PCa) metastases.

scholarly journals Differential Expression of System L Amino Acid Transporters during Wound Healing Process in the Skin of Young and Old Rats

2008 ◽  
Vol 31 (3) ◽  
pp. 395-399
Author(s):  
Moon-Jin Jeong ◽  
Chun Sung Kim ◽  
Joo-Cheol Park ◽  
Heung-Joong Kim ◽  
Yeong Mu Ko ◽  
...  
Keyword(s):  
Wound Healing ◽  
Amino Acid ◽  
Differential Expression ◽  
Healing Process ◽  
Wound Healing Process ◽  
Amino Acid Transporters ◽  
System L ◽  
Old Rats

scholarly journals Characterization of the system L amino acid transporter in T24 human bladder carcinoma cells

2002 ◽  
Vol 1565 (1) ◽  
pp. 112-122 ◽  
Author(s):  
Do Kyung Kim ◽  
Yoshikatsu Kanai ◽  
Hye Won Choi ◽  
Sahatchai Tangtrongsup ◽  
Arthit Chairoungdua ◽  
...  
Keyword(s):  
Amino Acid ◽  
Bladder Carcinoma ◽  
Amino Acid Transporter ◽  
Carcinoma Cells ◽  
Human Bladder ◽  
System L ◽  
Acid Transporter ◽  
Bladder Carcinoma Cells

Morphological descriptions of the egg and larval stages of Trichuris suis Schrank, 1788

Parasitology ◽  
1973 ◽  
Vol 67 (3) ◽  
pp. 263-278 ◽  
Author(s):  
R. J. S. Beer
Keyword(s):  
Reproductive System ◽  
Intestinal Tract ◽  
Vas Deferens ◽  
Ejaculatory Duct ◽  
The Body ◽  
Vitelline Membrane ◽  
Initial Development ◽  
Larval Stages ◽  
Trichuris Suis ◽  
System L

The egg and larval stages of Trichuris suis can be briefly characterized as follows: The egg: barrel shaped, possesses a thick shell consisting of three thick outer layers and an inner thin vitelline membrane, is operculate at each end and is unsegmented and unfertilized when freshly deposited. L. 1 within the egg: presence of an oral spear, a poorly denned oesophagus and an intestinal tract consisting of undifferentiated granulated material. L. 1 within the host: initial differentiation of an oesophagus, cell body, intestine and rectum. L. 2: further differentiation of the body organs and the appearance of the rudiments of the reproductive system. L. 3: initial development of reproductive system and development of a cloaca in the male thus distinguishing the sexes. L. 4: differentiation of reproductive system into vagina, uterus, oviduct and ovary in the female, and testis, vas deferens, ejaculatory duct, spicule and spicular muscle, sheath and tube in the male. L. 5 or adult stage: completed development of the sexual organs including formation of the vulval orifice and eggs in the female and seminal vesicle in the male.

Molecular design to mimic the copper(II) transport site of human albumin: studies of equilibria between copper(II) and glycylglycyl-L-histidine-N-methyl amide and comparison with human albumin

1976 ◽  
Vol 54 (8) ◽  
pp. 1300-1308 ◽  
Author(s):  
Theo P. A. Kruck ◽  
Show-Jy Lau ◽  
Bibudhendra Sarkar
Keyword(s):  
Ternary System ◽  
Equilibrium Dialysis ◽  
Human Albumin ◽  
Binary Complex ◽  
Mixed Complex ◽  
Free Peptide ◽  
System L ◽  
Peptide Derivative ◽  
Carboxyl Terminal ◽  
Transport Site

In continuing the investigation of designing the specific Cu(II)-transport site of human serum albumin, the peptide derivative glycylglycyl-L-histidine-N-methyl amide was designed to approximate more closely to the native protein. This peptide derivative was synthesized in good yield. The equilibria involved in the binary system, Cu(II)–glycylglycyl-L-histidine-N-methyl amide, have been studied, as well as those in the ternary system, L-histidine–Cu(II)–glycylglycyl-L-histidine-N-methyl amide. This peptide derivative was found to bind Cu(II) exclusively as a 1:1 complex in the pH range 4 to 11, having the same ligand atoms as those for the carboxyl-terminal free peptide and human albumin. However, it was found that glycylglycyl-L-histidine-N-methyl amide bound Cu(II) more strongly than did glycylglycyl-L-histidine, the stability constants being log β1–21 = −0.479 and −1.99 respectively. In the ternary system, only 10% of the mixed complex was detected at pH 7, in comparison to 80% found in the case of the carboxyl-terminal free peptide. This finding agrees well with the increased stability of this peptide binary complex. These observations are also consistent with the results obtained from the equilibrium dialysis experiments. The Cu(II) – peptide amide complex has a dissociation constant of 2.07 × 10−17, indicating a higher binding strength of this peptide derivative for Cu(II) over the native albumin by a factor of 3.

scholarly journals Antagonists of the system L neutral amino acid transporter (LAT) promote endothelial adhesivity of human red blood cells

2017 ◽  
Vol 117 (07) ◽  
pp. 1402-1411 ◽  
Author(s):  
Laura Beth Mann Dosier ◽  
Vikram J. Premkumar ◽  
Hongmei Zhu ◽  
Izzet Akosman ◽  
Michael F. Wempe ◽  
...  
Keyword(s):  
Amino Acid ◽  
Red Blood Cells ◽  
Blood Cells ◽  
Amino Acid Transporter ◽  
Neutral Amino Acid ◽  
Neutral Amino Acid Transporter ◽  
System L

SummaryThe system L neutral amino acid transporter (LAT; LAT1, LAT2, LAT3, or LAT4) has multiple functions in human biology, including the cellular import of S-nitrosothiols (SNOs), biologically active derivatives of nitric oxide (NO). SNO formation by haemoglobin within red blood cells (RBC) has been studied, but the conduit whereby a SNO leaves the RBC remains unidentified. Here we hypothesised that SNO export by RBCs may also depend on LAT activity, and investigated the role of RBC LAT in modulating SNO-sensitive RBC-endothelial cell (EC) adhesion. We used multiple pharmacologic inhibitors of LAT in vitro and in vivo to test the role of LAT in SNO export from RBCs and in thereby modulating RBC-EC adhesion. Inhibition of human RBC LAT by type-1-specific or nonspecific LAT antagonists increased RBC-endothelial adhesivity in vitro, and LAT inhibitors tended to increase post-transfusion RBC sequestration in the lung and decreased oxygenation in vivo. A LAT1-specific inhibitor attenuated SNO export from RBCs, and we demonstrated LAT1 in RBC membranes and LAT1 mRNA in reticulocytes. The proadhesive effects of inhibiting LAT1 could be overcome by supplemental L-CSNO (S-nitroso-L-cysteine), but not D-CSNO or L-Cys, and suggest a basal anti-adhesive role for stereospecific intercellular SNO transport. This study reveals for the first time a novel role of LAT1 in the export of SNOs from RBCs to prevent their adhesion to ECs. The findings have implications for the mechanisms of intercellular SNO signalling, and for thrombosis, sickle cell disease, and post-storage RBC transfusion, when RBC adhesivity is increased.

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