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1

cGMP-dependent protein kinases

100%
Kurowska E., Siednienko J., Gorczyca W. A.
Postępy Higieny i Medycyny Doświadczalnej
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2003
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vol. 57
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issue 6
631-648
EN
Cyclic GMP is common second messenger in a plethora of processes. Its major intracellular receptors are the cGMP-dependent protein kinases (PKGs). In this minireview we summarise the main results of studies on structure and physiological role of PKGs.
2
Content available remote

Synaptic plasticity of local connections in rat motor cortex

100%
Hess G.
Acta Neurobiologiae Experimentalis
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2004
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vol. 64
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issue 2
271-276
EN
This paper reviews studies that investigated mechanisms of the induction of long-term synaptic efficacy increase in local horizontal connections in slices of adult rat motor cortex. Long-term potentiation (LTP) could be induced by electrical stimulation of afferents using theta burst stimulation (TBS) conditionally, when synaptic inhibition was transiently blocked by focal application of GABAA receptor antagonist. Robust, long-lasting enhancement of synaptic transmission in horizontal connections was induced by brief application of the potassium channel blocker, tetraethylammonium (TEA, 25 mM), to the incubation medium. This TEA-LTP could be blocked by nifedipine, a voltage-dependent calcium channel blocker. A transient exposure of slices to elevated extracellular calcium (5 mM) resulted in a long-lasting enhancement of responses, termed Ca-LTP, which could be blocked by the antagonist of NMDA receptors, APV. The induction of both TEA-LTP and Ca-LTP, could be prevented by inhibitors of the extracellular signal regulated kinase (ERK) cascade U0126 and PD 98059. A transient activation of the ERK, 15 min after application of TEA or elevated [Ca2+], was demonstrated using immunofluorescence. Both forms of plasticity could also be prevented by the inhibitor of cAMP-dependent protein kinases (PKA), Rp-cAMPS. These studies indicate the involvement of the ERK and PKA signaling mechanisms in synaptic plasticity of the motor cortex in vitro. Since LTP in horizontal connections of the motor cortex has previously been shown to be related to the acquisition of a motor skill, it is suggested that the ERK and PKA signaling pathways may be involved in motor learning.
3

The cGMP synthesis and PKG1 expression in murine lymphoid organs

88%
Kurowska E., Kobialka M., Ziolo E., Strzadala L., Gorczyca W. A.
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issue 4
289-295
EN
Numerous reports indicate that cyclic 3',5' guanosine monophosphate (cGMP) is involved in the regulation of immune processes. However, the mechanisms responsible for the synthesis of this nucleotide and its signaling pathways in immune cells are still not well recognized. The aim of our study was to establish: 1) which form of guanylyl cyclase synthesizes cGMP in murine lymphoid organs and 2) whether the same organs express the isoforms PKG1alpha and/or PKG1beta of protein kinase G, known as a possible target for synthesized cGMP. Cells isolated from thymus, lymph nodes, and spleen were treated with activators (SNP, ANP, CNP, STa) of soluble or particulate cyclases. Sodium nitroprusside (SNP) elevated intracellular cGMP 2-fold in thymic and lymph node cells and about 10-fold in spleen cells. Atrial natriuretic peptide (ANP) caused modest but statistically significant increases of cGMP in cells of all the organs. Additionally, spleen cells elevated their cGMP content about 2-fold in response to C-type natriuretic protein (CNP). In cellular homogenates of all the analyzed organs, the antibody anti-PKG1beta stained the 78 kDa band corresponding to the molecular mass of PKG1. Only homogenates of spleen cells were stained by the antibody recognizing PKG1alpha. Our results indicate that in all the investigated organs, cGMP may be synthesized mainly by soluble guanylyl cyclases in response to nitric oxide. The modest increase of cGMP upon stimulation by ANP suggests that in all these organs either exist only a small subpopulation of cells that express particulate cyclase GC-A or GC-A is expressed at very low level. In spleen cells, however, cyclase GC-B appears to be the more active enzyme. Elevated cGMP concentration may in turn activate PKG1beta in thymus, lymph node, and spleen cells and also PKG1alpha in spleen cells.
4
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Protein kinase C in the barrel cortex

87%
Nowicka D.
Acta Neurobiologiae Experimentalis
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2000
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vol. 60
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issue 4
509
5
Content available remote

Effect of opioids on Ca2+/cAMP responsive element binding protein

75%
Bilecki W., Przewlocki P. R., Przewlocki R.
Acta Neurobiologiae Experimentalis
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2000
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vol. 60
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issue 4
557-567
EN
Ca2+/cAMP response element binding protein (CREB) is an important factor linking the opioid-regulated secondary messenger systems to alterations in gene expression. Opioids regulate CREB level, its phosphorylation and binding to its corresponding response element in the promoters of several genes implicated in drug addiction. CREB mediates the action of opioids on the expression of several genes in brain regions responsible for drug-seeking behavior and manifestation of signs of dependence. Moreover, alterations in CREB level can affect the rewarding properties of morphine and regulate the self-administration of cocaine. At the cellular level CREB acts as convergence point for different cellular pathways. Opioids affect two different intracellular mediator systems: inhibitory - connected with cAMP, and stimulatory - involving calcium and the PKC pathway. Both can affect CREB but in different phases of opiate action. The presence of this biphasic mechanism can explain the phenomenon of the induction of some CRE-controlled genes after both acute and chronic morphine administration. Cellular studies also highlight the relevance of other ATF/CREB family members which can affect Ca2+/cAMP response element (CRE) controlled transcription as well as other transcription factors which make the opioid induction longer lasting.
6

Heparin and atherosclerosis

75%
Stajszczak M., Gminski J.
Postępy Higieny i Medycyny Doświadczalnej
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1994
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vol. 48
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issue 3
275-290
EN
Heparin is a highly sulfated glycosaminoglycan with many functions such as antilipemic and antithrombotic.In spite os these activities heparin is able to inhibit vacsular smooth muscle cells proliferation and mmigration what seems to be very important event in the pathogenesis of atherosclerosos.The molecular mechanism of the action of heparin on smooth muscle cells is not yet understood.Heparin inhibits growth factors binding to their receptors,oncogenes expressionand has influence on the extracellular matrix protein deposition in the artery wall.
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