Cals are ideal neuroprotective agents. Heat shock protein 27 (HSP27) provides robust cellular protection, is an adenosine Ailure in treatment was defined as individuals who required continual antibiotic triphosphate-independent chaperone, a free radical scavenger, and is anti-apoptotic [7]. HSP27 undergoes various posttranslational modifications, including phosphorylation and oligomerization, and interacts with other small heat shock proteins, such as ab-crystallin and HSP20 [8], influencing its oligomeric state and regulating its function [9,10]. HSP27-transgenic cell and mouse lines exhibit numerous cytoprotective effects in in vivo models of various 10457188 diseases, including cardiac ischemia [11,12], kainate-induced hippocampal cell death [13], and nerve injury [14], in the tau model ofHSP27 Protects against Ischemic Brain InjuryAlzheimer disease [15,16], and in the SOD1G93A model of amyotrophic lateral sclerosis [17]. HSP27-transgenic mice exhibit reduced infarcts after transient cerebral ischemia [18], and viral delivery of HSP27 and intraperitoneal injection of PEP1-HSP27, but not HSP27 recombinant protein, into ischemic animal models are also protective [19,20]. Finally, endogenous induction of HSP27 was observed in ischemia-surviving cells [21] and in ischemic preconditioning models [22,23], suggesting that HSP27 is associated with cellular survival following cerebral ischemia. Phosphorylation and Title Loaded From File oligomerization of HSP27 are both essential for mediating neuroprotection against ischemic neuronal injury in HSP27 transgenic mouse models [24]. All of which suggest that HSP27 is a strong candidate molecule for brain protection against ischemic insults, and led 1315463 us to hypothesize that posttranslationally modified HSP27 might be a better treatment therapy than nonmodified recombinant HSP27. We tested this hypothesis by purifying HSP27 from human lymphocytes (hHSP27) and demonstrated that it attenuated ischemic brain damage in a mouse model of transient middle cerebral artery occlusion (MCAO).Materials and Methods HSP27 AntibodiesWe generated 2 anti-HSP27 rabbit polyclonal antibodies: antiHSP27-N1 against the 15-mer sequence MTERRVPFSLLRGPC at the N-terminal domain of human HSP27 and anti-HSP27-C1 against the 15-mer sequence CGGPEAAKSDETAAK at the Cterminal domain of human HSP27.lighting and provided food and water ad libitum. Mice were subjected to transient, 1-h MCAO, and then randomly divided into 3 groups: (1) an hHSP27 group that received tail-vein injections of hHSP27 after reperfusion, (2) a control group that received intravenous injections of 50 mg of bovine serum albumin (BSA), and (3) a sham-operated group that underwent the same procedure without MCAO. During this procedure, body temperature was maintained at 37.060.5uC with a heating pad. Systolic blood pressure was monitored by a noninvasive tail-cuff system (Softron BP-98A NIBP, Softron Co., Ltd.) in conscious mice. The selected dose and schedule of hHSP27 treatments were based on preliminary experiments that used 5 or 50 mg/mouse hHSP27 administered 0 (immediately), 1, 3, or 6 h after reperfusion (n = 3 in each group). Regional cerebral blood flow was measured by laser Doppler flowmetry before, during, and after MCAO, and before the mice were sacrificed. 24 h after reperfusion, mice were anesthetized by intraperitoneal injections of 50 mg/kg pentobarbital and decapitated. To evaluate infarct area and volume, brain slices were stained with cresyl violet or 2,3,5-triphenyltetrazolium chloride, scanned with AxioVision software (Carl Zeiss MicroImaging GmbH),.Cals are ideal neuroprotective agents. Heat shock protein 27 (HSP27) provides robust cellular protection, is an adenosine triphosphate-independent chaperone, a free radical scavenger, and is anti-apoptotic [7]. HSP27 undergoes various posttranslational modifications, including phosphorylation and oligomerization, and interacts with other small heat shock proteins, such as ab-crystallin and HSP20 [8], influencing its oligomeric state and regulating its function [9,10]. HSP27-transgenic cell and mouse lines exhibit numerous cytoprotective effects in in vivo models of various 10457188 diseases, including cardiac ischemia [11,12], kainate-induced hippocampal cell death [13], and nerve injury [14], in the tau model ofHSP27 Protects against Ischemic Brain InjuryAlzheimer disease [15,16], and in the SOD1G93A model of amyotrophic lateral sclerosis [17]. HSP27-transgenic mice exhibit reduced infarcts after transient cerebral ischemia [18], and viral delivery of HSP27 and intraperitoneal injection of PEP1-HSP27, but not HSP27 recombinant protein, into ischemic animal models are also protective [19,20]. Finally, endogenous induction of HSP27 was observed in ischemia-surviving cells [21] and in ischemic preconditioning models [22,23], suggesting that HSP27 is associated with cellular survival following cerebral ischemia. Phosphorylation and oligomerization of HSP27 are both essential for mediating neuroprotection against ischemic neuronal injury in HSP27 transgenic mouse models [24]. All of which suggest that HSP27 is a strong candidate molecule for brain protection against ischemic insults, and led 1315463 us to hypothesize that posttranslationally modified HSP27 might be a better treatment therapy than nonmodified recombinant HSP27. We tested this hypothesis by purifying HSP27 from human lymphocytes (hHSP27) and demonstrated that it attenuated ischemic brain damage in a mouse model of transient middle cerebral artery occlusion (MCAO).Materials and Methods HSP27 AntibodiesWe generated 2 anti-HSP27 rabbit polyclonal antibodies: antiHSP27-N1 against the 15-mer sequence MTERRVPFSLLRGPC at the N-terminal domain of human HSP27 and anti-HSP27-C1 against the 15-mer sequence CGGPEAAKSDETAAK at the Cterminal domain of human HSP27.lighting and provided food and water ad libitum. Mice were subjected to transient, 1-h MCAO, and then randomly divided into 3 groups: (1) an hHSP27 group that received tail-vein injections of hHSP27 after reperfusion, (2) a control group that received intravenous injections of 50 mg of bovine serum albumin (BSA), and (3) a sham-operated group that underwent the same procedure without MCAO. During this procedure, body temperature was maintained at 37.060.5uC with a heating pad. Systolic blood pressure was monitored by a noninvasive tail-cuff system (Softron BP-98A NIBP, Softron Co., Ltd.) in conscious mice. The selected dose and schedule of hHSP27 treatments were based on preliminary experiments that used 5 or 50 mg/mouse hHSP27 administered 0 (immediately), 1, 3, or 6 h after reperfusion (n = 3 in each group). Regional cerebral blood flow was measured by laser Doppler flowmetry before, during, and after MCAO, and before the mice were sacrificed. 24 h after reperfusion, mice were anesthetized by intraperitoneal injections of 50 mg/kg pentobarbital and decapitated. To evaluate infarct area and volume, brain slices were stained with cresyl violet or 2,3,5-triphenyltetrazolium chloride, scanned with AxioVision software (Carl Zeiss MicroImaging GmbH),.
