1
|
Gekka M, Abumiya T, Komatsu T, Funaki R, Kurisu K, Shimbo D, Kawabori M, Osanai T, Nakayama N, Kazumata K, Houkin K. Novel Hemoglobin-Based Oxygen Carrier Bound With Albumin Shows Neuroprotection With Possible Antioxidant Effects. Stroke 2018; 49:1960-1968. [DOI: 10.1161/strokeaha.118.021467] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Masayuki Gekka
- From the Department of Neurosurgery, Hokkaido University Graduate School of Medicine, Sapporo, Japan (M.G., T.A., K.K., D.S., M.K., T.O., N.N., K.K., K.H.)
| | - Takeo Abumiya
- From the Department of Neurosurgery, Hokkaido University Graduate School of Medicine, Sapporo, Japan (M.G., T.A., K.K., D.S., M.K., T.O., N.N., K.K., K.H.)
| | - Teruyuki Komatsu
- Department of Applied Chemistry, Faculty of Science and Engineering, Chuo University, Tokyo, Japan (R.F., T.K.)
| | - Ryosuke Funaki
- Department of Applied Chemistry, Faculty of Science and Engineering, Chuo University, Tokyo, Japan (R.F., T.K.)
| | - Kota Kurisu
- From the Department of Neurosurgery, Hokkaido University Graduate School of Medicine, Sapporo, Japan (M.G., T.A., K.K., D.S., M.K., T.O., N.N., K.K., K.H.)
| | - Daisuke Shimbo
- From the Department of Neurosurgery, Hokkaido University Graduate School of Medicine, Sapporo, Japan (M.G., T.A., K.K., D.S., M.K., T.O., N.N., K.K., K.H.)
| | - Masato Kawabori
- From the Department of Neurosurgery, Hokkaido University Graduate School of Medicine, Sapporo, Japan (M.G., T.A., K.K., D.S., M.K., T.O., N.N., K.K., K.H.)
| | - Toshiya Osanai
- From the Department of Neurosurgery, Hokkaido University Graduate School of Medicine, Sapporo, Japan (M.G., T.A., K.K., D.S., M.K., T.O., N.N., K.K., K.H.)
| | - Naoki Nakayama
- From the Department of Neurosurgery, Hokkaido University Graduate School of Medicine, Sapporo, Japan (M.G., T.A., K.K., D.S., M.K., T.O., N.N., K.K., K.H.)
| | - Ken Kazumata
- From the Department of Neurosurgery, Hokkaido University Graduate School of Medicine, Sapporo, Japan (M.G., T.A., K.K., D.S., M.K., T.O., N.N., K.K., K.H.)
| | - Kiyohiro Houkin
- From the Department of Neurosurgery, Hokkaido University Graduate School of Medicine, Sapporo, Japan (M.G., T.A., K.K., D.S., M.K., T.O., N.N., K.K., K.H.)
| |
Collapse
|
3
|
Abstract
Integrin α1β1 is widely expressed in mesenchyme and the immune system, as well as a minority of epithelial tissues. Signaling through α1 contributes to the regulation of extracellular matrix composition, in addition to supplying in some tissues a proliferative and survival signal that appears to be unique among the collagen binding integrins. α1 provides a tissue retention function for cells of the immune system including monocytes and T cells, where it also contributes to their long-term survival, providing for peripheral T cell memory, and contributing to diseases of autoimmunity. The viability of α1 null mice, as well as the generation of therapeutic monoclonal antibodies against this molecule, have enabled studies of the role of α1 in a wide range of pathophysiological circumstances. The immune functions of α1 make it a rational therapeutic target.
Collapse
|
4
|
Baalman KL, Cotton RJ, Rasband SN, Rasband MN. Blast wave exposure impairs memory and decreases axon initial segment length. J Neurotrauma 2013; 30:741-51. [PMID: 23025758 DOI: 10.1089/neu.2012.2478] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Exposure to a blast wave has been proposed to cause mild traumatic brain injury (mTBI), with symptoms including altered cognition, memory, and behavior. This idea, however, remains controversial, and the mechanisms of blast-induced brain injury remain unknown. To begin to resolve these questions, we constructed a simple compressed air shock tube, placed rats inside the tube, and exposed them to a highly reproducible and controlled blast wave. Consistent with the generation of a mild injury, 2 weeks after exposure to the blast, we found that motor performance was unaffected, and a panel of common injury markers showed little or no significant changes in expression in the cortex, corpus callosum, or hippocampus. Similarly, we were unable to detect elevated spectrin breakdown products in brains collected from blast-exposed rats. Using an object recognition task, however, we found that rats exposed to a blast wave spent significantly less time exploring a novel object when compared with control rats. Intriguingly, we also observed a significant shortening of the axon initial segment (AIS) in both the cortex and hippocampus of blast-exposed rats, suggesting altered neuronal excitability after exposure to a blast. A computational model showed that shortening the AIS increased both threshold and the interspike interval of repetitively firing neurons. These results support the conclusion that exposure to a single blast wave can lead to mTBI with accompanying cognitive impairment and subcellular changes in the molecular organization of neurons.
Collapse
Affiliation(s)
- Kelli L Baalman
- Department of Neuroscience, Baylor College of Medicine, Houston, Texas 77030, USA
| | | | | | | |
Collapse
|
6
|
Lee DH, Lee HR, Shin HK, Park SY, Hong KW, Kim EK, Bae SS, Lee WS, Rhim BY, Kim CD. Cilostazol enhances integrin-dependent homing of progenitor cells by activation of cAMP-dependent protein kinase in synergy with Epac1. J Neurosci Res 2011; 89:650-60. [PMID: 21337364 DOI: 10.1002/jnr.22558] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2010] [Revised: 10/25/2010] [Accepted: 10/25/2010] [Indexed: 11/10/2022]
Abstract
Recruitment and adhesion of exogenous endothelial progenitor cells (EPCs) or endogenously mobilized bone marrow mononuclear cells (BM MNCs) to the sites of ischemia is an important focus of cell therapy. This study sought to determine whether cilostazol enhances integrin-dependent homing of progenitor cells both in vitro and in vivo. In the in vitro experiments with human umbilical cord blood (HUCB)-derived EPCs, cilostazol (10 μM) stimulated up-regulation of integrins β1, α1, and αv as well as 8-pCPT-2'-O-Me-cAMP (100 μM; 8-pCPT, Epac activator). Cilostazol and 8-pCPT significantly enhanced migration and adhesion of HUCB EPCs to a fibronectin-coated plate and endothelial cells, which were inhibited by KT5720 (PKA inhibitor, 1 μM) and GGTI-298 (Rap1 inhibitor, 20 μM). Cilostazol stimulated Epac1 expression and up-regulated the active Rap1, as did 8-pCPT, and they were suppressed by KT5720 (P < 0.001) and GGTI-298 (P < 0.001). 8-pCPT increased p-CREB expression and stimulated PKA activity, which was inhibited by KT5720, Rp-cAMPS, and GGTI-298. In addition, N(6)-benzoyl-cAMP (100 μM) increased Rap1 GTP expression, as did 8-pCPT; they were suppressed by Rp-cAMPS and GGTI-298. The in vivo experiments showed that cilostazol (30 mg/kg/day, orally for 7 days) significantly enhanced the integrin β1 expression in the molecular layer and up-regulated homing of BM MNCs to the injured molecular layer with increased capillary density in mouse brain subjected to transient forebrain ischemia (n = 6, P < 0.001). In conclusion, cilostazol stimulated integrin expression and enhanced migration and adhesion of progenitor cells through cooperative activation of PKA and Epac signals; such activity may improve the efficacy of cell therapy for ischemic disease.
Collapse
Affiliation(s)
- Dong Hyung Lee
- Medical Research Center for Ischemic Tissue Regeneration, Department of Pharmacology, School of Medicine, Pusan National University, Yangsan-si, Gyeongsangnam-do, Korea
| | | | | | | | | | | | | | | | | | | |
Collapse
|