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ABSTRACT: Purpose: It has been reported that granulocyte colony-stimulating factor (G-CSF) provides neuroprotection in models in which neuronal cell death is induced. This research was designed to investigate the effects of G-CSF on neurodegeneration of the inner retinal layer in a rat model of ischemic reperfusion (I/R) injury. Materials and Methods: Retinal ischemia was induced by increasing the intraocular pressure to 110 mm Hg for 45 min in the left eyes of the rats. A sham operation was carried out on the right eyes. G-CSF (100 µg/kg/day in 0.3 ml saline) or the same volume of saline was intraperitoneally injected just before the operation and continued for 4 consecutive days (a total of 5 consecutive days). Morphological examinations, including the terminal deoxynucleotidyl transferase dUTP nick end labeling (TUNEL) assay, were performed 7 days after I/R induction. The expression of phosphorylated AKT in the retina was examined by Western blot analysis and immunohistochemistry. Results: Cell loss in the ganglion cell layer was more significantly reduced in the I/R-induced eyes of the G-CSF-injected rats than in the I/R-induced eyes of the saline-injected rats (20.3 vs. 6.6%). The inner retinal thickness ratios, such as the inner plexiform layer to the inner limiting membrane/outer nuclear layer and the inner nuclear layer/outer nuclear layer, were significantly better preserved in the I/R-induced eyes of the G-CSF-injected rats than in the I/R-induced eyes of the saline-injected rats. TUNEL assays showed fewer apoptotic cells in the retinal sections of the I/R-induced eyes of the G-CSF-injected rats. The phosphorylation of AKT (p-AKT/AKT) was upregulated in the retinas of the I/R-induced eyes of the G-CSF-injected rats. Conclusion: Our results demonstrated that systemic injection of G-CSF can protect retinal ganglion cells and inner retinal layers from I/R injury. The effects could be associated with the activation of AKT.
Ophthalmic Research 08/2012; 48(4):199-207. · 1.56 Impact Factor
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ABSTRACT: PURPOSE:: Large diurnal intraocular pressure (IOP) fluctuation (▵IOP) is believed to be one of the causes of progression in glaucomatous changes. Some fully medicated glaucoma patients whose IOPs are controlled during the regular office hours (10:00 to 16:00 h) still have progression in glaucomatous changes and IOP elevation during off-office hours. The purpose of this study was to determine whether ▵IOP is dampened after combined trabeculotomy and sinusotomy (LOT+SIN) in glaucoma patients with low IOPs during the regular office hours. PATIENTS AND METHODS:: Fourteen eyes of 8 open-angle glaucoma patients who had large ▵IOP despite low IOPs during the office hours were studied. The IOP was measured every 3 hours for 24 hours before and >3 months after the operation. The IOPs were measured in the sitting position with a Goldmann applanation tonometer. All patients underwent LOT+SIN. RESULTS:: All patients had IOP elevations >20 mm Hg between 0:00 and 3:00 hours before the operation, and none had an IOP peak after the operation. The postoperative mean IOP (16.5±1.7 to 13.9±2.0 mm Hg, P=0.00064), the maximum IOP (21.9±2.4 to 16.1±2.5 mm Hg, P=0.0020), and ▵IOP (8.9±2.7 to 4.3±1.2 mm Hg, P=0.0032) were significantly lower than the preoperative values. However, the minimum IOP was not reduced significantly (13.0±1.9 to 11.7±1.7 mm Hg). CONCLUSIONS:: The diurnal ▵IOPs are dampened by LOT+SIN in glaucoma patients with controlled IOPs during regular office hours. These results indicate that these surgical procedures can be used for the treatment of open-angle glaucoma patients.
Journal of glaucoma 01/2012; · 1.74 Impact Factor
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ABSTRACT: We report a case of choroidal melanoma with massive extraocular extensions through the sclera. A 64-year-old woman reported blurred vision in her right eye. At the first visit, visual acuity was 10/20 OD. An ophthalmological examination revealed a raised choroidal mass and exudative retinal detachment in the lower retina. A diagnosis of peripheral choroidal melanoma was confirmed by additional test results. Because the tumor size was large and no systemic metastasis was found, we recommended enucleation. However, the patient refused and requested only to be followed without treatment. Seven months later, the tumor showed extraocular extensions through the sclera into subconjunctival space and she finally agreed to undergo enucleation. Histopathologic findings showed that the tumor was a mixed cell malignant melanoma of the choroid. The eye was filled with tumor cells, and the tumor had massive extraocular extensions into the orbit through the sclera and scleral emissarium vessels. The intraocular tumor was markedly necrotic, which indicated rapid growth. Choroidal melanomas can increase quickly in size resulting in extraocular extensions through the sclera.
Clinical ophthalmology (Auckland, N.Z.) 01/2012; 6:2081-4.
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ABSTRACT: The combination of allogeneic bone marrow transplantation (allo-BMT) and donor lymphocyte infusion (DLI) is a useful method for establishing donor chimerism and preventing a relapse of leukemia/lymphoma. However, there is a risk of inducing uncontrollable fatal graft-versus-host disease (GVHD). In fact, allo-BMT plus intravenous (IV)-DLI using donor splenocytes induces fatal GVHD in recipient mice. In this study, we examined the effects of the combination of intra-bone marrow (IBM)-BMT and the subcutaneous injection of donor splenocytes (SC-DLI) on the allo-BMT system. Recipient BALB/c mice were conditioned by sublethal irradiation (5 Gy), followed by IBM-BMT plus IV-DLI or SC-DLI in C57BL/6 mice. The IV-DLI group showed better engraftment of donor hemopoietic cells than the control group (without DLI) but showed fatal GVHD. The SC-DLI group, however, showed good reconstitution and mild GVHD. These results suggest that the combination of SC-DLI and IBM-BMT promotes the reconstitution of hemopoiesis and helps reduce the risk of GVHD.
Stem cells and development 10/2010; 20(5):759-68. · 4.15 Impact Factor
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ABSTRACT: There have been reports that bone marrow cells (BMCs) can differentiate into various cells and tissues and that BMCs improve the function of the injured organs or reduce the organ damage, thereby rescuing the individuals from death. However, these reports also noted that injuries were induced in the organs. Therefore, it is not clear whether BMCs can differentiate into parenchymal cells in organs in normal life or whether BMCs can supply organ-specific stem cells. In this paper, we examine whether adult BMCs could contribute to the development of various organs in normal development after birth and in normal life. BMCs from adult eGFP mice (8 weeks old) were injected into the liver of newborn C57BL/6 mice. The existence of donor-derived cells in various organs was examined 1 year after the injection. In the organs of recipient mice, some of the CD45(+) hemopoietic cells (1.4-13.2%) and CD31(+) endothelial cells (0-2.2%) expressed eGFP, though no other lineage cells did so. These results suggest that adult BMCs can differentiate into not only hemopoietic cells but also vascular endothelial cells, but cannot differentiate into other lineage cells in normal growth and normal life.
International journal of hematology 03/2010; 91(2):213-8. · 1.17 Impact Factor
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ABSTRACT: It has been reported that the fusion cells of dendritic cells (DCs) and tumor cells have anti-tumor effects. In this experiment, we examined the anti-tumor effects of fusion cells of bone marrow-derived DC type 1 (DC1) and irradiated tumor cells using a newly commercially available hemagglutinating virus of Japan-envelope (HVJ-E) after cell fusion, in a mouse model. To induce DC1, bone marrow cells (BMCs) from BALB/c mice were cultured with GM-CSF, IL-12 and IFN-gamma. BMC-derived DC1 were fused with 20-Gy-irradiated Meth A cells (BALB/c-derived fibrosarcoma) using HVJ-E. We subcutaneously injected: i) the BMC-derived DC1, or ii) the fusion cells of the DC1 and the irradiated Meth A cells, into Meth A-bearing BALB/c mice. The injection of only DC1 showed a moderate anti-tumor effect, as we previously described. However, the fusion cells were more effective in not only suppressing tumor growth but also prolonging survival. These results suggest that the fusion cells of DC1 and the irradiated tumor cells using HVJ-E were more effective in tumor suppression than DC1 alone.
International Journal of Oncology 09/2009; 35(2):249-55. · 2.40 Impact Factor
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ABSTRACT: When bone marrow transplantation (BMT) is carried out, survival of the donor hematopoietic stem cells is crucial to maintain donor hematopoiesis in the recipients. We have shown that intra-bone marrow-bone marrow transplantation (IBM-BMT) can induce the rapid recovery of donor hematopoiesis and allow a reduction in radiation doses as a pretreatment for BMT. If IBM-BMT methodology can be further improved, BMT could be carried out more safely and more easily. In this experiment, we attempted to suppress apoptosis of donor hematopoietic cells using a caspase inhibitor, ZVAD-fmk, upon IBM-BMT in mouse allogeneic IBM-BMT. IBM-BMT with ZVAD-fmk induced superior engraftment of donor hematopoietic cells and greater numbers of day-12 colony-forming units of spleen (CFU-S) than IBM-BMT without ZVAD-fmk upon allogeneic BMT (C57BL/6 into BALB/c mice). ZVAD-fmk slightly suppressed apoptosis of whole BMCs, whereas it significantly suppressed apoptosis of c-kit+/Sca-1+/lineage(-) cells (KSL cells) in vitro. These results suggest that ZVAD-fmk can suppress apoptosis of hematopoietic stem cells and/or immature progenitor cells of the donor bone marrow cells, thereby accelerating the donor hematopoiesis.
Stem cells and development 09/2009; 19(4):461-8. · 4.15 Impact Factor
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Yoko Tokuyama,
Yasushi Adachi,
Keizo Minamino,
Hiroshi Shintaku,
Mitsuhiko Okigaki,
Kumi Hayashi,
Aiko Kitajima,
Takashi Takaki,
Naoko Koike, Chieko Shima,
Yuichiro Imai,
Ming Shi,
Seiji Yanai,
Susumu Ikehara
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ABSTRACT: (NZW x BXSB)F1 mice (W/BF1 mice) have been reported to develop autoimmune diseases with aging. We have also reported that the number of dendritic cells (DCs) increases in the various organs, and that the B-cell response to LPS or interleukin-4 plus anti-mu increase with aging in W/BF1 mice. In the present experiment, we show that many DCs exist not only in the T-cell area but also in the B-cell area and the sinus in the spleen of aged W/BF1 mice, and that the coculturing of DCs from aged W/BF1 mice and B cells from disease-free young W/BF1 mice produces much more IgG and IgM than normal mice. These results suggest that an abnormal distribution of DCs and the interaction of DCs and B cells induce the hyperproduction of immunoglobulin in aged W/BF1 mice.
Autoimmunity 08/2009; 42(5):399-405. · 2.47 Impact Factor
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ABSTRACT: Bevacizumab is a human monoclonal IgG1 antibody that blocks the action of vascular endothelial growth factor (VEGF). The purpose of this study was to determine the level of VEGF and pigment epithelium-derived factor (PEDF) in eyes with proliferative diabetic retinopathy (PDR) before and after an intravitreal injection of bevacizumab.
Eleven eyes of ten patients were studied. Patients were included if they had neovascular glaucoma, rubeosis of the iris with PDR, or aggressive PDR. Samples of aqueous humor were collected just before the injection of bevacizumab and the vitrectomy. The concentrations of VEGF and PEDF in the aqueous humor were measured by enzyme-linked immunosorbent assay, and the effects of bevacizumab on PDR were evaluated.
The free VEGF concentration before the injection was 676.5 +/- 186.7 pg/ml (mean +/- SEM, n = 11). Seven days later, it was significantly reduced to 7.1 +/- 7.1 pg/ml (P < 0.005, n = 9). The PEDF concentration before the injection was 2.32 +/- 0.49 microg/ml (n = 11), and 7 days later, it was 3.23 +/- 0.76 microg/ml (P = 0.33). During the vitrectomy, patients had less intraoperative bleeding when the neovascular tissues were cut.
An intravitreal injection of bevacizumab significantly decreased the free VEGF in the aqueous humor by 7 days, indicating that the clinical effects of bevacizumab appear rapidly. However, intravitreal bevacizumab did not affect the level of intraocular PEDF.
Japanese Journal of Ophthalmology 05/2009; 53(3):243-8. · 0.92 Impact Factor
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Masaru Inatani,
Keiichiro Iwao,
Takahiro Kawaji,
Yoshio Hirano,
Yuichiro Ogura,
Kazuyuki Hirooka,
Fumio Shiraga,
Yoriko Nakanishi,
Hiroyuki Yamamoto,
Akira Negi,
Yuka Shimonagano,
Taiji Sakamoto, Chieko Shima,
Miyo Matsumura,
Hidenobu Tanihara
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ABSTRACT: To determine the risk factors for intraocular pressure (IOP) elevation after the injection of triamcinolone acetonide (TA).
Retrospective interventional case-control study.
Multicenter.
Four hundred and twenty-seven patients.
Intraocular pressure levels after TA treatment by the sub-Tenon capsule injection (STI; 12 mg, 20 mg, or 40 mg), intravitreal injection (IVI; 4 mg or 8 mg), or the combination of STI (20 mg) and IVI (4 mg), and IOP levels after two TA treatments.
Risk factors for IOP levels of 24 mm Hg or higher.
Younger age (hazards ratio [HR], 0.96/year; P < .0001), IVI (HR, 1.89/year; P < .0001), and higher baseline IOP (HR, 1.15/mm Hg; P = .003) were identified as risk factors. Dose dependency was shown in STI-treated eyes (HR, 1.07/mg; P = .0006), as well as after IVI (HR, 1.64/mg; P = .013). The combination of STI and IVI was a significant risk factor (HR, 2.27; P = .003) compared with STI alone. In eyes receiving two TA treatments, IVI (HR, 2.60; P = .010), higher IOP elevation after the first injection (HR, 1.18/mm Hg; P = .011), and increased dosage of STI (HR, 1.07/mm Hg; P = .033) were risk factors.
Younger age, higher baseline IOP, IVI, and increased TA dosage were associated with TA-induced IOP elevation. IOP elevation after repeated TA injection was frequently associated with eyes treated with IVI, high IOP elevation after the first injection, and high doses of STI.
American Journal of Ophthalmology 04/2008; 145(4):676-681. · 4.22 Impact Factor
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ABSTRACT: Diabetic retinopathy and nephropathy are microvascular complications in patients with diabetes that are considered to be related. Pigment epithelium-derived factor (PEDF), a strong inhibitor of angiogenesis, is significantly elevated in the blood of diabetic patients, especially those with proliferative diabetic retinopathy (PDR). The level of PEDF in the blood, on the other hand, is reported to be low in a diabetic nephropathy. The aim of this study was to determine the relationship between PEDF and renal function in patients with diabetic retinopathy.
A total of 243 type 2 diabetic patients were studied. The relationship between the diabetic retinopathy and levels of PEDF, HbA1c, blood urea nitrogen (BUN), and creatinine were evaluated.
The mean plasma PEDF level in patients with PDR (7.69+/-6.14 microg/ml; mean+/-standard error) was significantly higher than that of mild-to-moderate nonproliferative diabetic retinopathy (5.07+/-4.37 microg/ml, p=0.02). The level of BUN and creatinine increased significantly as the stage of diabetic retinopathy advanced. The plasma PEDF levels were significantly correlated with the levels of BUN and creatinine (r=0.54, p<0.0001; r=0.57, p<0.0001, respectively).
The levels of plasma PEDF increases with advances in both diabetic retinopathy and nephropathy. Thus, increased levels of PEDF in the blood may indicate microvascular damages in diabetic patients and may be predictor of the progression of retinopathy and nephropathy.
Molecular vision 01/2008; 14:992-6. · 2.20 Impact Factor
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ABSTRACT: Metastasis of a malignant tumor to the iris is rare. We treated a patient with such a metastasis from esophageal cancer.
A 58-year-old man who had had an operation for squamous esophageal cancer complained of conjunctival injection affecting the left eye. On examination, visual acuity in both eyes was 1.2, and intraocular pressure (IOP) in both eyes was 18 mmHg. A grayish tumor with irregular contours was found on the surface of the iris of the left eye at 2 o'clock, and cottonlike material was pooled in the anterior chamber. No metastases elsewhere in the body were clinically evident. After IOP rose to 34 mmHg accompanied by ocular pain, we performed a peripheral iridectomy for diagnosis. Pathologic findings indicated squamous esophageal cancer metastatic to the iris. Metastases to lung and liver were found by computed tomography shortly after hospitalization. Radiotherapy 40 Gy was applied to the iris tumor. IOP then fell, and ocular pain disappeared.
Metastasis of a squamous esophageal cancer to the iris can resemble a hypopyon. Radiotherapy was effective in this patient.
Nippon Ganka Gakkai zasshi 10/2007; 111(9):735-40.
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Nahoko Ogata,
Masato Matsuoka,
Kayako Matsuyama, Chieko Shima,
Aran Tajika,
Toshiyuki Nishiyama,
Mitsumasa Wada,
Nobuo Jo,
Akiko Higuchi,
Keizo Minamino,
Hiroshi Matsunaga,
Toshihiko Takeda,
Miyo Matsumura
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ABSTRACT: Pigment epithelium-derived factor (PEDF) is a strong inhibitor of angiogenesis. Eyes with diabetic retinopathy have low levels of ocular PEDF; however, the PEDF levels in the blood of diabetics have still not been determined.
Our objective was to determine the plasma levels of PEDF in diabetic patients and to determine the relationship with the stage of the diabetic retinopathy.
This study was designed as a cross-sectional, institutional study.
A total of 145 Japanese were studied; 112 had type 2 diabetes mellitus, and 33 were healthy controls.
There was no intervention.
The plasma level of PEDF was measured by ELISA, and the stage of diabetic retinopathy was determined by ophthalmic examinations. Clinical systemic status of diabetic patients was also examined.
The plasma PEDF level in diabetic patients (6.68 +/- 0.54 microg/ml; mean +/- sem) was significantly higher than that in controls (4.38 +/- 0.59 microg/ml, P = 0.03), and the level was especially high in patients with proliferative diabetic retinopathy (7.78 +/- 0.98 microg/ml; n = 45; P = 0.005). The gender (P = 0.03), blood urea nitrogen (P = 0.005), and triglycerides (P = 0.04) were significant and independent determinants of plasma PEDF levels in diabetic patients.
The PEDF level in the plasma was significantly elevated in diabetic patients, especially those with proliferative diabetic retinopathy. High levels of PEDF in the plasma may be related to the progression of diabetic retinopathy.
Journal of Clinical Endocrinology & Metabolism 04/2007; 92(3):1176-9. · 6.50 Impact Factor
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ABSTRACT: To determine whether a posterior sub-Tenon injection of triamcinolone acetonide (TA) before focal photocoagulation is safe and effective in patients with diabetic macular edema.
Sixteen eyes of 11 diabetic patients with unresolved diffuse macular edema were treated with a 20-mg sub-Tenon injection of TA 1 to 2 months before focal photocoagulation. Focal photocoagulation was applied only to microaneurysms, and grid laser photocoagulation was not performed. The main outcome measures used were visual acuity (VA), central macular thickness (CMT) determined by optical coherence tomography (OCT), and the fluorescein angiographic appearance of the retina. Patients were followed for at least 6 months.
One month after the sub-Tenon injection of TA, the macular edema was resolved with a significant reduction of the CMT on OCT. VA improved slightly. Subsequent focal photocoagulation of the microaneurysms maintained the significant reduction of CMT for up to 6 months. A significant improvement of VA was observed in 37.5% patients at 6 months, and there was no decrease in VA in any of the patients.
A 20-mg sub-Tenon TA injection prior to focal laser photocoagulation is a safe and beneficial treatment in patients with diabetic macular edema.
Japanese Journal of Ophthalmology 52(4):265-8. · 0.92 Impact Factor
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Japanese Journal of Ophthalmology 52(5):426. · 0.92 Impact Factor
