Lavrnja, Irena

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Authority KeyName Variants
orcid::0000-0002-0607-5594
  • Lavrnja, Irena (3)
  • Lavrnja, I. (1)
  • Lavrnja, Irene (1)
Projects

Author's Bibliography

Expression of ecto-nucleoside triphosphate diphosphohydrolase3 (NTPDase3) in the female rat brain during postnatal development

Grković, Ivana; Bjelobaba, Ivana; Mitrović, Nataša Lj.; Lavrnja, Irena; Drakulić, Dunja R.; Martinović, Jelena; Stanojlović, Miloš R.; Horvat, Anica; Nedeljković, Nadežda

(2016)

TY  - JOUR
AU  - Grković, Ivana
AU  - Bjelobaba, Ivana
AU  - Mitrović, Nataša Lj.
AU  - Lavrnja, Irena
AU  - Drakulić, Dunja R.
AU  - Martinović, Jelena
AU  - Stanojlović, Miloš R.
AU  - Horvat, Anica
AU  - Nedeljković, Nadežda
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1289
AB  - Nucleoside triphosphate diphosphohydrolase3 (NTPDase3) is membrane-bound ecto-enzyme which hydrolyzes extracellular ATP, thus modulating the function of purinergic receptors and the pattern of purinergic signaling. Here we analyzed the developmental expression of NTPDase3 in female hypothalamus, cerebral cortex and hippocampal formation at different postnatal ages (PD7-PD90) by qRT-PCR and immunohistochemistry. In hypothalamus and hippocampus, a similar developmental profile was seen: NTPDase3 gene expression was stable during postnatal development and increased in adults. In the cortex, upregulation of NTPDase3 mRNA expression was seen at PD15 and further increase was evidenced in adults. Immunohistochemical analysis at PD7 revealed faint neuronal NTPDase3 localization in a dorsal hypothalamus. The immunoreactivity (ir) gradually increased in PD15 and PD20, in clusters of cells in the lateral, ventral and dorsomedial hypothalamus. Furthermore, in PD20 animals, NTPDase3-ir was detected on short fibers in the posterior hypothalamic area, while in PD30 the fibers appeared progressively longer and markedly varicose. In adults, the strongest NTPDase3-ir was observed in collections of cells in dorsomedial hypothalamic nucleus, dorsal and lateral hypothalamus and in several thalamic areas, whereas the varicose fibers traversed entire diencephalon, particularly paraventricular thalamic nucleus, ventromedial and dorsomedial hypothalamic nuclei, the arcuate nucleus and the prefornical part of the lateral hypothalamus. The presumably ascending NTPDase3-ir fibers were first observed in PD20; their density and the varicose appearance increased until the adulthood. Prominent enhancement of NTPDase3-ir in the hypothalamus coincides with age when animals acquire diurnal rhythms of sleeping and feeding, supporting the hypothesis that this enzyme may be involved in regulation of homeostatic functions. (C) 2016 Elsevier B.V. All rights reserved.
T2  - Journal of Chemical Neuroanatomy
T1  - Expression of ecto-nucleoside triphosphate diphosphohydrolase3 (NTPDase3) in the female rat brain during postnatal development
VL  - 77
SP  - 10
EP  - 18
DO  - 10.1016/j.jchemneu.2016.04.001
ER  - 
@article{
author = "Grković, Ivana and Bjelobaba, Ivana and Mitrović, Nataša Lj. and Lavrnja, Irena and Drakulić, Dunja R. and Martinović, Jelena and Stanojlović, Miloš R. and Horvat, Anica and Nedeljković, Nadežda",
year = "2016",
abstract = "Nucleoside triphosphate diphosphohydrolase3 (NTPDase3) is membrane-bound ecto-enzyme which hydrolyzes extracellular ATP, thus modulating the function of purinergic receptors and the pattern of purinergic signaling. Here we analyzed the developmental expression of NTPDase3 in female hypothalamus, cerebral cortex and hippocampal formation at different postnatal ages (PD7-PD90) by qRT-PCR and immunohistochemistry. In hypothalamus and hippocampus, a similar developmental profile was seen: NTPDase3 gene expression was stable during postnatal development and increased in adults. In the cortex, upregulation of NTPDase3 mRNA expression was seen at PD15 and further increase was evidenced in adults. Immunohistochemical analysis at PD7 revealed faint neuronal NTPDase3 localization in a dorsal hypothalamus. The immunoreactivity (ir) gradually increased in PD15 and PD20, in clusters of cells in the lateral, ventral and dorsomedial hypothalamus. Furthermore, in PD20 animals, NTPDase3-ir was detected on short fibers in the posterior hypothalamic area, while in PD30 the fibers appeared progressively longer and markedly varicose. In adults, the strongest NTPDase3-ir was observed in collections of cells in dorsomedial hypothalamic nucleus, dorsal and lateral hypothalamus and in several thalamic areas, whereas the varicose fibers traversed entire diencephalon, particularly paraventricular thalamic nucleus, ventromedial and dorsomedial hypothalamic nuclei, the arcuate nucleus and the prefornical part of the lateral hypothalamus. The presumably ascending NTPDase3-ir fibers were first observed in PD20; their density and the varicose appearance increased until the adulthood. Prominent enhancement of NTPDase3-ir in the hypothalamus coincides with age when animals acquire diurnal rhythms of sleeping and feeding, supporting the hypothesis that this enzyme may be involved in regulation of homeostatic functions. (C) 2016 Elsevier B.V. All rights reserved.",
journal = "Journal of Chemical Neuroanatomy",
title = "Expression of ecto-nucleoside triphosphate diphosphohydrolase3 (NTPDase3) in the female rat brain during postnatal development",
volume = "77",
pages = "10-18",
doi = "10.1016/j.jchemneu.2016.04.001"
}
Grković, I., Bjelobaba, I., Mitrović, N. Lj., Lavrnja, I., Drakulić, D. R., Martinović, J., Stanojlović, M. R., Horvat, A.,& Nedeljković, N.. (2016). Expression of ecto-nucleoside triphosphate diphosphohydrolase3 (NTPDase3) in the female rat brain during postnatal development. in Journal of Chemical Neuroanatomy, 77, 10-18.
https://doi.org/10.1016/j.jchemneu.2016.04.001
Grković I, Bjelobaba I, Mitrović NL, Lavrnja I, Drakulić DR, Martinović J, Stanojlović MR, Horvat A, Nedeljković N. Expression of ecto-nucleoside triphosphate diphosphohydrolase3 (NTPDase3) in the female rat brain during postnatal development. in Journal of Chemical Neuroanatomy. 2016;77:10-18.
doi:10.1016/j.jchemneu.2016.04.001 .
Grković, Ivana, Bjelobaba, Ivana, Mitrović, Nataša Lj., Lavrnja, Irena, Drakulić, Dunja R., Martinović, Jelena, Stanojlović, Miloš R., Horvat, Anica, Nedeljković, Nadežda, "Expression of ecto-nucleoside triphosphate diphosphohydrolase3 (NTPDase3) in the female rat brain during postnatal development" in Journal of Chemical Neuroanatomy, 77 (2016):10-18,
https://doi.org/10.1016/j.jchemneu.2016.04.001 . .
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Brain Injury Alters Ectonucleotidase Activities and Adenine Nucleotide Levels in Rat Serum

Laketa, Danijela; Savić, Jasmina; Bjelobaba, Ivana; Lavrnja, Irene; Vasić, Vesna M.; Stojiljković, Mirjana; Nedeljković, Nadežda

(2015)

TY  - JOUR
AU  - Laketa, Danijela
AU  - Savić, Jasmina
AU  - Bjelobaba, Ivana
AU  - Lavrnja, Irene
AU  - Vasić, Vesna M.
AU  - Stojiljković, Mirjana
AU  - Nedeljković, Nadežda
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/385
AB  - Background: Cortical stab injury (CSI) induces changes in the activity, expression and cellular distribution of specific ectonucleotidases at the injury site. Also, several experimentally induced neuropathologies are associated with changes in soluble ectonucleotidase activities in the plasma and serum, whilst various insults to the brain alter purine compounds levels in cerebrospinal fluid, but also in serum, indicating that insults to the brain may induce alterations in nucleotides release and rate of their hydrolysis in the vascular system. Since adenine nucleotides and adenosine regulate diverse cellular functions in the vascular system, including vascular tone, platelet aggregation and inflammatory responses of lymphocytes and macrophages, alterations of ectonucleotidase activities in the vascular system may be relevant for the clinical outcome of the primary insult. Methods: We explored ectonucleotidase activities using specific enzyme assays and determined adenine nucleotides concentrations by the UPLC method in the rat serum after cortical stab injury. Results: At 4-h post-injury, ATP and AMP hydrolysis increased by about 60% and 40%, respectively, while phosphodiesterase activity remained unchanged. Also, at 4-h postinjury a marked decrease in ATP concentration and more than 2-fold increase in AMP concentration were recorded. Conclusions: CSI induces rapid up-regulation of nucleotide catabolizing soluble ectonucleotidases in rat serum, which leads to the observed shift in serum nucleotide levels. The results obtained imply that ectonucleotidases and adenine nucleotides participate in the communication between the brain and the vascular system in physiological and pathological conditions and thereby may be involved in the development of various human neuropathologies.
T2  - Journal of Medical Biochemistry
T1  - Brain Injury Alters Ectonucleotidase Activities and Adenine Nucleotide Levels in Rat Serum
VL  - 34
IS  - 2
SP  - 215
EP  - 222
DO  - 10.2478/jomb-2014-0025
ER  - 
@article{
author = "Laketa, Danijela and Savić, Jasmina and Bjelobaba, Ivana and Lavrnja, Irene and Vasić, Vesna M. and Stojiljković, Mirjana and Nedeljković, Nadežda",
year = "2015",
abstract = "Background: Cortical stab injury (CSI) induces changes in the activity, expression and cellular distribution of specific ectonucleotidases at the injury site. Also, several experimentally induced neuropathologies are associated with changes in soluble ectonucleotidase activities in the plasma and serum, whilst various insults to the brain alter purine compounds levels in cerebrospinal fluid, but also in serum, indicating that insults to the brain may induce alterations in nucleotides release and rate of their hydrolysis in the vascular system. Since adenine nucleotides and adenosine regulate diverse cellular functions in the vascular system, including vascular tone, platelet aggregation and inflammatory responses of lymphocytes and macrophages, alterations of ectonucleotidase activities in the vascular system may be relevant for the clinical outcome of the primary insult. Methods: We explored ectonucleotidase activities using specific enzyme assays and determined adenine nucleotides concentrations by the UPLC method in the rat serum after cortical stab injury. Results: At 4-h post-injury, ATP and AMP hydrolysis increased by about 60% and 40%, respectively, while phosphodiesterase activity remained unchanged. Also, at 4-h postinjury a marked decrease in ATP concentration and more than 2-fold increase in AMP concentration were recorded. Conclusions: CSI induces rapid up-regulation of nucleotide catabolizing soluble ectonucleotidases in rat serum, which leads to the observed shift in serum nucleotide levels. The results obtained imply that ectonucleotidases and adenine nucleotides participate in the communication between the brain and the vascular system in physiological and pathological conditions and thereby may be involved in the development of various human neuropathologies.",
journal = "Journal of Medical Biochemistry",
title = "Brain Injury Alters Ectonucleotidase Activities and Adenine Nucleotide Levels in Rat Serum",
volume = "34",
number = "2",
pages = "215-222",
doi = "10.2478/jomb-2014-0025"
}
Laketa, D., Savić, J., Bjelobaba, I., Lavrnja, I., Vasić, V. M., Stojiljković, M.,& Nedeljković, N.. (2015). Brain Injury Alters Ectonucleotidase Activities and Adenine Nucleotide Levels in Rat Serum. in Journal of Medical Biochemistry, 34(2), 215-222.
https://doi.org/10.2478/jomb-2014-0025
Laketa D, Savić J, Bjelobaba I, Lavrnja I, Vasić VM, Stojiljković M, Nedeljković N. Brain Injury Alters Ectonucleotidase Activities and Adenine Nucleotide Levels in Rat Serum. in Journal of Medical Biochemistry. 2015;34(2):215-222.
doi:10.2478/jomb-2014-0025 .
Laketa, Danijela, Savić, Jasmina, Bjelobaba, Ivana, Lavrnja, Irene, Vasić, Vesna M., Stojiljković, Mirjana, Nedeljković, Nadežda, "Brain Injury Alters Ectonucleotidase Activities and Adenine Nucleotide Levels in Rat Serum" in Journal of Medical Biochemistry, 34, no. 2 (2015):215-222,
https://doi.org/10.2478/jomb-2014-0025 . .
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Low-Dose Dexamethasone Treatment Promotes the Pro-Survival Signalling Pathway in the Adult Rat Prefrontal Cortex

Drakulić, Dunja R.; Velickovic, N.; Stanojlović, Miloš R.; Grković, Ivana; Mitrović, Nataša Lj.; Lavrnja, I.; Horvat, Anica

(2013)

TY  - JOUR
AU  - Drakulić, Dunja R.
AU  - Velickovic, N.
AU  - Stanojlović, Miloš R.
AU  - Grković, Ivana
AU  - Mitrović, Nataša Lj.
AU  - Lavrnja, I.
AU  - Horvat, Anica
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5549
AB  - Synthetic glucocorticoid dexamethasone (DEX), a highly potent anti-inflammatory and immunosuppressive agent, is widely used in the treatment of brain cancer, as well as for inflammatory and autoimmune diseases. The present study aimed to determine whether low-dose subchronic DEX treatment (100g/kg for eight consecutive days) exerts long-term effects on apoptosis in the adult rat prefrontal cortex (PFC) by examining the expression of cell death-promoting molecules [poly(ADP-ribose) polymerase (PARP), p53, procaspase 3, cleaved caspase 3, Bax] and cell-survival molecules (AKT, Bcl-2). The results obtained revealed that body, thymus and adrenal gland weights, as well corticosterone levels, in the serum and PFC were reduced 1day after the last DEX injection. In the PFC, DEX caused activation of AKT, augmentation of pro-survival Bcl-2 protein and an enhanced Bcl-2/Bax protein ratio, as well Bcl-2 translocation to the mitochondria. An unaltered profile with respect to the protein expression of apoptotic molecules PARP, procaspase 3 and Bax was detected, whereas p53 protein was decreased. Reverse transcriptase -polymerase chain reaction analysis showed a decrease of p53 mRNA levels and no significant difference in Bcl-2 and Bax mRNA expression in DEX-treated rats. Finally, a DNA fragmentation assay and Fluoro-Jade staining demonstrated no considerable changes in apoptosis in the rat PFC. Our findings support the concept that low-dose DEX creates a hypocorticoid state in the brain and also indicate that subchronic DEX treatment activates the pro-survival signalling pathway but does not change apoptotic markers in the rat PFC. This mechanism might be relevant for the DEX-induced apoptosis resistance observed during and after chemotherapy of patients with brain tumours.
T2  - Journal of Neuroendocrinology
T1  - Low-Dose Dexamethasone Treatment Promotes the Pro-Survival Signalling Pathway in the Adult Rat Prefrontal Cortex
VL  - 25
IS  - 7
SP  - 605
EP  - 616
DO  - 10.1111/jne.12037
ER  - 
@article{
author = "Drakulić, Dunja R. and Velickovic, N. and Stanojlović, Miloš R. and Grković, Ivana and Mitrović, Nataša Lj. and Lavrnja, I. and Horvat, Anica",
year = "2013",
abstract = "Synthetic glucocorticoid dexamethasone (DEX), a highly potent anti-inflammatory and immunosuppressive agent, is widely used in the treatment of brain cancer, as well as for inflammatory and autoimmune diseases. The present study aimed to determine whether low-dose subchronic DEX treatment (100g/kg for eight consecutive days) exerts long-term effects on apoptosis in the adult rat prefrontal cortex (PFC) by examining the expression of cell death-promoting molecules [poly(ADP-ribose) polymerase (PARP), p53, procaspase 3, cleaved caspase 3, Bax] and cell-survival molecules (AKT, Bcl-2). The results obtained revealed that body, thymus and adrenal gland weights, as well corticosterone levels, in the serum and PFC were reduced 1day after the last DEX injection. In the PFC, DEX caused activation of AKT, augmentation of pro-survival Bcl-2 protein and an enhanced Bcl-2/Bax protein ratio, as well Bcl-2 translocation to the mitochondria. An unaltered profile with respect to the protein expression of apoptotic molecules PARP, procaspase 3 and Bax was detected, whereas p53 protein was decreased. Reverse transcriptase -polymerase chain reaction analysis showed a decrease of p53 mRNA levels and no significant difference in Bcl-2 and Bax mRNA expression in DEX-treated rats. Finally, a DNA fragmentation assay and Fluoro-Jade staining demonstrated no considerable changes in apoptosis in the rat PFC. Our findings support the concept that low-dose DEX creates a hypocorticoid state in the brain and also indicate that subchronic DEX treatment activates the pro-survival signalling pathway but does not change apoptotic markers in the rat PFC. This mechanism might be relevant for the DEX-induced apoptosis resistance observed during and after chemotherapy of patients with brain tumours.",
journal = "Journal of Neuroendocrinology",
title = "Low-Dose Dexamethasone Treatment Promotes the Pro-Survival Signalling Pathway in the Adult Rat Prefrontal Cortex",
volume = "25",
number = "7",
pages = "605-616",
doi = "10.1111/jne.12037"
}
Drakulić, D. R., Velickovic, N., Stanojlović, M. R., Grković, I., Mitrović, N. Lj., Lavrnja, I.,& Horvat, A.. (2013). Low-Dose Dexamethasone Treatment Promotes the Pro-Survival Signalling Pathway in the Adult Rat Prefrontal Cortex. in Journal of Neuroendocrinology, 25(7), 605-616.
https://doi.org/10.1111/jne.12037
Drakulić DR, Velickovic N, Stanojlović MR, Grković I, Mitrović NL, Lavrnja I, Horvat A. Low-Dose Dexamethasone Treatment Promotes the Pro-Survival Signalling Pathway in the Adult Rat Prefrontal Cortex. in Journal of Neuroendocrinology. 2013;25(7):605-616.
doi:10.1111/jne.12037 .
Drakulić, Dunja R., Velickovic, N., Stanojlović, Miloš R., Grković, Ivana, Mitrović, Nataša Lj., Lavrnja, I., Horvat, Anica, "Low-Dose Dexamethasone Treatment Promotes the Pro-Survival Signalling Pathway in the Adult Rat Prefrontal Cortex" in Journal of Neuroendocrinology, 25, no. 7 (2013):605-616,
https://doi.org/10.1111/jne.12037 . .
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Hyperbaric oxygenation reduces neuronal degeneration by regulation of oxidant/antioxidant status in the rat brain tissue after cortical injury

Brkić, Predrag; Jovanović, Tomislav; Krstić, Danijela Z.; Stojiljković, Mirjana; Čolović, Mirjana B.; Dacic, Sanja; Mitrovic, Ana; Bjelaobaba, Ivana; Savić, Danijela; Parbucki, Ana; Lavrnja, Irena; Rakić, Ljubisav; Peković, Sanja

(2012)

TY  - CONF
AU  - Brkić, Predrag
AU  - Jovanović, Tomislav
AU  - Krstić, Danijela Z.
AU  - Stojiljković, Mirjana
AU  - Čolović, Mirjana B.
AU  - Dacic, Sanja
AU  - Mitrovic, Ana
AU  - Bjelaobaba, Ivana
AU  - Savić, Danijela
AU  - Parbucki, Ana
AU  - Lavrnja, Irena
AU  - Rakić, Ljubisav
AU  - Peković, Sanja
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4847
C3  - Brain Injury
T1  - Hyperbaric oxygenation reduces neuronal degeneration by regulation of oxidant/antioxidant status in the rat brain tissue after cortical injury
VL  - 26
IS  - 4-5
SP  - 486
EP  - 487
UR  - https://hdl.handle.net/21.15107/rcub_vinar_4847
ER  - 
@conference{
author = "Brkić, Predrag and Jovanović, Tomislav and Krstić, Danijela Z. and Stojiljković, Mirjana and Čolović, Mirjana B. and Dacic, Sanja and Mitrovic, Ana and Bjelaobaba, Ivana and Savić, Danijela and Parbucki, Ana and Lavrnja, Irena and Rakić, Ljubisav and Peković, Sanja",
year = "2012",
journal = "Brain Injury",
title = "Hyperbaric oxygenation reduces neuronal degeneration by regulation of oxidant/antioxidant status in the rat brain tissue after cortical injury",
volume = "26",
number = "4-5",
pages = "486-487",
url = "https://hdl.handle.net/21.15107/rcub_vinar_4847"
}
Brkić, P., Jovanović, T., Krstić, D. Z., Stojiljković, M., Čolović, M. B., Dacic, S., Mitrovic, A., Bjelaobaba, I., Savić, D., Parbucki, A., Lavrnja, I., Rakić, L.,& Peković, S.. (2012). Hyperbaric oxygenation reduces neuronal degeneration by regulation of oxidant/antioxidant status in the rat brain tissue after cortical injury. in Brain Injury, 26(4-5), 486-487.
https://hdl.handle.net/21.15107/rcub_vinar_4847
Brkić P, Jovanović T, Krstić DZ, Stojiljković M, Čolović MB, Dacic S, Mitrovic A, Bjelaobaba I, Savić D, Parbucki A, Lavrnja I, Rakić L, Peković S. Hyperbaric oxygenation reduces neuronal degeneration by regulation of oxidant/antioxidant status in the rat brain tissue after cortical injury. in Brain Injury. 2012;26(4-5):486-487.
https://hdl.handle.net/21.15107/rcub_vinar_4847 .
Brkić, Predrag, Jovanović, Tomislav, Krstić, Danijela Z., Stojiljković, Mirjana, Čolović, Mirjana B., Dacic, Sanja, Mitrovic, Ana, Bjelaobaba, Ivana, Savić, Danijela, Parbucki, Ana, Lavrnja, Irena, Rakić, Ljubisav, Peković, Sanja, "Hyperbaric oxygenation reduces neuronal degeneration by regulation of oxidant/antioxidant status in the rat brain tissue after cortical injury" in Brain Injury, 26, no. 4-5 (2012):486-487,
https://hdl.handle.net/21.15107/rcub_vinar_4847 .

Biochemical characterization of soluble nucleotide pyrophosphatase/phosphodiesterase activity in rat serum

Laketa, Danijela; Bjelobaba, Ivana; Savić, Jasmina; Lavrnja, Irena; Stojiljković, Mirjana; Rakić, Ljubisav; Nedeljković, Nadežda

(2010)

TY  - JOUR
AU  - Laketa, Danijela
AU  - Bjelobaba, Ivana
AU  - Savić, Jasmina
AU  - Lavrnja, Irena
AU  - Stojiljković, Mirjana
AU  - Rakić, Ljubisav
AU  - Nedeljković, Nadežda
PY  - 2010
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3996
AB  - Biochemical properties of nucleotide pyrophosphatase/phosphodiesterase (NPP) in rat serum have been described by assessing its nucleotide phosphodiesterase activity, using p-nitrophenyl-5-thymidine monophosphate (p-Nph-5-TMP) as a substrate. It was demonstrated that NPP activity shares some typical characteristics described for other soluble NPP, such as divalent cation dependence, strong alkaline pH optimum (pH 10.5), inhibition by glycosaminoglycans, and K (m) for p-Nph-5-TMP hydrolysis of 61.8 +/- A 5.2 mu M. In order to characterize the relation between phosphodiesterase and pyrophosphatase activities of NPP, we have analyzed the effects of different natural nucleotides and nucleotide analogs. ATP, ADP, and AMP competitively inhibited p-Nph-5-TMP hydrolysis with K (i) values ranging 13-43 mu M. Nucleotide analogs, alpha,beta-metATP, BzATP, 2-MeSATP, and dialATP behaved as competitive inhibitors, whereas alpha,beta-metADP induced mixed inhibition, with K (i) ranging from 2 to 20 mu M. Chromatographic analysis revealed that alpha,beta-metATP, BzATP, and 2-MeSATP were catalytically degraded in the serum, whereas dialATP and alpha,beta-metADP resisted hydrolysis, implying that the former act as substrates and the latter as true competitive inhibitors of serum NPP activity. Since NPP activity is involved in generation, breakdown, and recycling of extracellular adenine nucleotides in the vascular compartment, the results suggest that both hydrolyzable and non-hydrolyzable nucleotide analogs could alter the amplitude and direction of ATP actions and could have potential therapeutic application.
T2  - Molecular and Cellular Biochemistry
T1  - Biochemical characterization of soluble nucleotide pyrophosphatase/phosphodiesterase activity in rat serum
VL  - 339
IS  - 1-2
SP  - 99
EP  - 106
DO  - 10.1007/s11010-009-0373-1
ER  - 
@article{
author = "Laketa, Danijela and Bjelobaba, Ivana and Savić, Jasmina and Lavrnja, Irena and Stojiljković, Mirjana and Rakić, Ljubisav and Nedeljković, Nadežda",
year = "2010",
abstract = "Biochemical properties of nucleotide pyrophosphatase/phosphodiesterase (NPP) in rat serum have been described by assessing its nucleotide phosphodiesterase activity, using p-nitrophenyl-5-thymidine monophosphate (p-Nph-5-TMP) as a substrate. It was demonstrated that NPP activity shares some typical characteristics described for other soluble NPP, such as divalent cation dependence, strong alkaline pH optimum (pH 10.5), inhibition by glycosaminoglycans, and K (m) for p-Nph-5-TMP hydrolysis of 61.8 +/- A 5.2 mu M. In order to characterize the relation between phosphodiesterase and pyrophosphatase activities of NPP, we have analyzed the effects of different natural nucleotides and nucleotide analogs. ATP, ADP, and AMP competitively inhibited p-Nph-5-TMP hydrolysis with K (i) values ranging 13-43 mu M. Nucleotide analogs, alpha,beta-metATP, BzATP, 2-MeSATP, and dialATP behaved as competitive inhibitors, whereas alpha,beta-metADP induced mixed inhibition, with K (i) ranging from 2 to 20 mu M. Chromatographic analysis revealed that alpha,beta-metATP, BzATP, and 2-MeSATP were catalytically degraded in the serum, whereas dialATP and alpha,beta-metADP resisted hydrolysis, implying that the former act as substrates and the latter as true competitive inhibitors of serum NPP activity. Since NPP activity is involved in generation, breakdown, and recycling of extracellular adenine nucleotides in the vascular compartment, the results suggest that both hydrolyzable and non-hydrolyzable nucleotide analogs could alter the amplitude and direction of ATP actions and could have potential therapeutic application.",
journal = "Molecular and Cellular Biochemistry",
title = "Biochemical characterization of soluble nucleotide pyrophosphatase/phosphodiesterase activity in rat serum",
volume = "339",
number = "1-2",
pages = "99-106",
doi = "10.1007/s11010-009-0373-1"
}
Laketa, D., Bjelobaba, I., Savić, J., Lavrnja, I., Stojiljković, M., Rakić, L.,& Nedeljković, N.. (2010). Biochemical characterization of soluble nucleotide pyrophosphatase/phosphodiesterase activity in rat serum. in Molecular and Cellular Biochemistry, 339(1-2), 99-106.
https://doi.org/10.1007/s11010-009-0373-1
Laketa D, Bjelobaba I, Savić J, Lavrnja I, Stojiljković M, Rakić L, Nedeljković N. Biochemical characterization of soluble nucleotide pyrophosphatase/phosphodiesterase activity in rat serum. in Molecular and Cellular Biochemistry. 2010;339(1-2):99-106.
doi:10.1007/s11010-009-0373-1 .
Laketa, Danijela, Bjelobaba, Ivana, Savić, Jasmina, Lavrnja, Irena, Stojiljković, Mirjana, Rakić, Ljubisav, Nedeljković, Nadežda, "Biochemical characterization of soluble nucleotide pyrophosphatase/phosphodiesterase activity in rat serum" in Molecular and Cellular Biochemistry, 339, no. 1-2 (2010):99-106,
https://doi.org/10.1007/s11010-009-0373-1 . .
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