Involvement of cyclic adenosine diphosphoribose receptor activation in ischemic preconditioning induced protection in mouse brain

Rehni, Ashish K.; Singh, Thakur Gurjeet; Bhateja, Pradeep; Singh, Nirmal; Arora, Sandeep

doi:10.1016/j.brainres.2009.10.071

Cited by 11 publications

(2 citation statements)

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“…21,23,24) Therefore, the assessment of cerebral infarct size using the triphenyltetrazolium chloride staining method and the quantitation of spatial memory and motor coordination using the elevated plus maze test and the rota-rod test respectively, were employed in order to assess the loss of brain structure and functions elicited by the ischemia-reperfusion injury as standardized earlier in our laboratory. [25][26][27][28] MATERIALS AND METHODS Swiss albino mice of either sex weighing 25Ϯ2 g, maintained on standard laboratory diet (Kisan Feeds Ltd., Mumbai, India) and having free access to tap water were employed in the present study. They were housed in the departmental animal house and were exposed to 12 h cycle of light and dark.…”

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confidence: 99%

Possible Involvement of Ubiquitin Proteasome System and Other Proteases in Acute and Delayed Aspects of Ischemic Preconditioning of Brain in Mice

Rehni

Singh

Behl

et al. 2010

Biological & Pharmaceutical Bulletin

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Ischemic stroke is a syndrome characterized by rapid onset of neurological injury due to interruption of blood flow to the brain. 1) Although mortality from ischemic stroke has declined over the last decade but it still remains the third leading cause of death as only limited therapeutically strategies exist.2) Ischemic preconditioning is a potent protective strategy introduced by Murray and coworkers 3) for the ischemic myocardium which was later applied by Kitagawa et al. to the ischemic neuronal injury as well. 4)Multiple mediators have been shown to cause the protective effect produced by ischemic preconditioning of brain, including adenosine, acetylcholine, catecholamines, angiotensin II, bradykinin, endothelin and opioids.5-12) Ubiquitin-proteasome system and other proteases are few of the principal enzyme systems responsible for protein degradation and has been reported to be abundantly expressed in the various cell types of the central nervous system. 13,14) The addition of poly-ubiquitin chains to a protein results in its translocation to the proteasome, a large multi-subunit protease, which then results in its degradation. Recent in vitro reports have demonstrated the role of this ubiquitin-proteasome enzyme system as playing an essential role in rapid phase of ischemic preconditioning of cultured neurons. 15,16) Moreover, ubiquitin-proteasome system activation is one of the important mechanisms regulating the cell death pathways in ischemic neurons.13) And given the fact that a sub-threshold activation of various cell death pathways has been reported to contribute towards the biochemical progression of the phenomenon of preconditioning.17) Further, a recent experimental report has indicated the involvement of ubiquitin-proteasome system activation in mediating the cardioprotective effect of different phases of ischemic preconditioning of myocardial cells.18) Z-Leu-Leu-Phe-Chinese hamster ovary (CHO) is a cell permeable proteasome inhibitor acting on the ubiquitin proteasome enzyme system. 19) Therefore, the present study has been designed to evaluate the possible effect of Z-Leu-Leu-Phe-CHO (2 mg/kg, intraperitoneally (i.p.)), a selective inhibitor of ubiquitin proteasome system and other proteases, 19) on acute and delayed aspects of ischemic preconditioning induced protection of the mouse brain.Various research groups have reported that an episode of severe ischemia followed by reperfusion induces a marked cell death in the rodent brain. [20][21][22] This cell damage has been shown to be of diffused nature and is spread throughout the brain including the hippocampus and the motor cortex. 21,23,24) Therefore, the assessment of cerebral infarct size using the triphenyltetrazolium chloride staining method and the quantitation of spatial memory and motor coordination using the elevated plus maze test and the rota-rod test respectively, were employed in order to assess the loss of brain structure and functions elicited by the ischemia-reperfusion injury as standardized earlier in our laboratory. [25][26]...

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confidence: 99%

Possible Involvement of Ubiquitin Proteasome System and Other Proteases in Acute and Delayed Aspects of Ischemic Preconditioning of Brain in Mice

Rehni

Singh

Behl

et al. 2010

Biological & Pharmaceutical Bulletin

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“…This cell damage has been shown to be of diffused nature and is spread throughout the brain including the hippocampus and the motor cortex (Dobkin, 1991;Jenkins et al, 1981;Yamamoto et al, 2009). Therefore, the assessment of cerebral infarct size using the triphenyltetrazolium chloride staining method and the quantitation of spatial memory and motor coordination using the elevated plus maze test and the rota-rod test respectively, were employed in order to assess the loss of brain structure and functions elicited by the ischemia-reperfusion injury as standardized earlier in our laboratory (Rehni et al, 2008a(Rehni et al, ,b, 2009(Rehni et al, , 2010.…”

Section: Introductionmentioning

confidence: 99%