urpose: Misonidazole is a radiosensitizer that binds in hypoxic cells. The purpose of this study was to find out the feasibility of I-131-Iodomisonidazole (IMISO) for imaging of tumor hypoxia. MATERIALS AND METHODS: Tosyl precursor was dissolved in acetonitrile and I-131-NaI was added to synthesize IMISO. Balb/c mice inoculated with CT-26 adenocarcinoma were injected with IMISO. Mice were sacrificed at 1,2,4,24 hr and % of injected dose per gram of tissue (%ID/g) was determined. For scintigraphy and MRI, mouse bearing CT-26 adenocarcinoma was administered with IMISO and imaging was performed 4 hr after. Then, mouse body was fixed and microtomized slice was placed on radiographic film for autoradiography. RESULTS: %ID/g of tumor was 1.64 (1h), 0.98 (2h), 0.85 (4h) and 0.20 (24h), respectively. At 24h, %ID/g of tumor was higher than that of all other tissues except thyroid. Tumor to muscle ratio increased with time and tumor to blood ratio also increased with time and reached 1.53 at 24 hr. On autoradiogram, tumor was well visualized as an increased activity in central hypoxic area of the tumor which corresponds to the area of high signal intensity on T2-weighted MR image. On scintigraphy, tumor uptake was visualized. CONCLUSION:: This RESULTS suggest that IMISO may have a potential for tumor hypoxia imaging in mouse model. However, further study is needed to improve it's localization in tumor tissue and to achieve acceptable images of tumor hypoxia.
Adenocarcinoma* ; Animals ; Anoxia* ; Autoradiography ; Magnetic Resonance Imaging ; Mice* ; Misonidazole ; Radionuclide Imaging ; Thyroid Gland ; X-Ray Film

In a murine model of systemic lupus erythematosus (SLE)-like chronic graft-versus-host disease (cGVHD), donor CD8+T cells rapidly fall into anergy to host cells, while donor CD4+T cells hyperactivate B cells and break B-cell tolerance to self-Ags in the recipient mouse. The functional recovery of donor CD8+T cells can result in the conversion of cGVHD to acute GVHD (aGVHD), indicating that donor CD8+T-cell anergy is a restriction factor in the development of cGVHD. In this report, we present evidence that donor CD4+CD25+regulatory T cells (T(reg) cells) are critical in maintaining the donor CD8+T-cell anergy and thus suppressing the development of aGVHD in mice that are naturally prone to cGVHD. Our results provide a novel insight into the role of T(reg) cells in determining cGVHD versus aGVHD.
T-Lymphocytes, Regulatory/*immunology ; Mice, Inbred DBA ; Mice ; Interleukin-2 Receptor alpha Subunit/*metabolism ; Immune Tolerance/physiology ; Graft vs Host Disease/*immunology ; Female ; Clonal Anergy/*physiology ; Chronic Disease ; CD8-Positive T-Lymphocytes/*immunology ; CD4-Positive T-Lymphocytes/*immunology ; Animals

OBJECTIVE: The freezing response in rats has been used widely as an index of fear in threatening or stressful situations. Considering its importance in basic studies of affective disorders and in drug testing, it is necessary to develop a reliable, automated system for measuring the freezing response accurately. METHODS: We developed the Vision-Based Analysis for Freezing (V-BAFF) system to analyze the freezing response in rats, based on several image-processing modules and motion classification schemes generated from our own experience. We compared the performance of V-BAFF with that of experienced human observers. RESULTS: The level of freezing measured with V-BAFF was highly correlated with that measured by human observers. CONCLUSION: We demonstrated that V-BAFF could yield a bias-free, accurate, and efficient measurement of freezing in rats.
Animals ; Freezing ; Humans ; Mood Disorders ; Rats

Background and Objectives: To investigate the association between metabolic syndrome (MetS) and hearing impairment (HI) in elderly Korean adults using a large-scale cohort data.Subjects and Method Data was collected on 729664 adults who underwent at least one health screening between 2009 and 2012 from the Korea National Health Insurance Service-Senior Cohort. The study utilized a Cox proportional hazards regression model to assess the relationship between MetS and the risk of developing HI. The results were presented as an adjusted hazard ratio (aHR) with 95% confidence intervals (CI). All subjects were monitored until the occurrence of HI, death, or December 31, 2019. Results: A total of 10102 cases of HI were identified during the follow-up period of 4920397 person-years. In the crude model, MetS was linked to an increased risk of developing HI (HR, 1.14; 95% CI, 1.10-1.19). No significant association was found after adjusting for potential confounding factors (aHR, 1.03; 95% CI, 0.99-1.08). Abnormal triglyceride (TG) levels were associated with a higher risk of HI compared to normal TG levels (aHR, 1.07; 95% CI, 1.03-1.12). In addition, the risk of HI increased as TG levels increased (>150 mg/dL). Conclusion Abnormalities in TG levels were independently associated with an increased risk of HI among elderly adults. Management of TG levels may protect against the risk of incident HI.

Background and Objectives: To investigate the association between metabolic syndrome (MetS) and hearing impairment (HI) in elderly Korean adults using a large-scale cohort data.Subjects and Method Data was collected on 729664 adults who underwent at least one health screening between 2009 and 2012 from the Korea National Health Insurance Service-Senior Cohort. The study utilized a Cox proportional hazards regression model to assess the relationship between MetS and the risk of developing HI. The results were presented as an adjusted hazard ratio (aHR) with 95% confidence intervals (CI). All subjects were monitored until the occurrence of HI, death, or December 31, 2019. Results: A total of 10102 cases of HI were identified during the follow-up period of 4920397 person-years. In the crude model, MetS was linked to an increased risk of developing HI (HR, 1.14; 95% CI, 1.10-1.19). No significant association was found after adjusting for potential confounding factors (aHR, 1.03; 95% CI, 0.99-1.08). Abnormal triglyceride (TG) levels were associated with a higher risk of HI compared to normal TG levels (aHR, 1.07; 95% CI, 1.03-1.12). In addition, the risk of HI increased as TG levels increased (>150 mg/dL). Conclusion Abnormalities in TG levels were independently associated with an increased risk of HI among elderly adults. Management of TG levels may protect against the risk of incident HI.

Background and Objectives: To investigate the association between metabolic syndrome (MetS) and hearing impairment (HI) in elderly Korean adults using a large-scale cohort data.Subjects and Method Data was collected on 729664 adults who underwent at least one health screening between 2009 and 2012 from the Korea National Health Insurance Service-Senior Cohort. The study utilized a Cox proportional hazards regression model to assess the relationship between MetS and the risk of developing HI. The results were presented as an adjusted hazard ratio (aHR) with 95% confidence intervals (CI). All subjects were monitored until the occurrence of HI, death, or December 31, 2019. Results: A total of 10102 cases of HI were identified during the follow-up period of 4920397 person-years. In the crude model, MetS was linked to an increased risk of developing HI (HR, 1.14; 95% CI, 1.10-1.19). No significant association was found after adjusting for potential confounding factors (aHR, 1.03; 95% CI, 0.99-1.08). Abnormal triglyceride (TG) levels were associated with a higher risk of HI compared to normal TG levels (aHR, 1.07; 95% CI, 1.03-1.12). In addition, the risk of HI increased as TG levels increased (>150 mg/dL). Conclusion Abnormalities in TG levels were independently associated with an increased risk of HI among elderly adults. Management of TG levels may protect against the risk of incident HI.

Background and Objectives: To investigate the association between metabolic syndrome (MetS) and hearing impairment (HI) in elderly Korean adults using a large-scale cohort data.Subjects and Method Data was collected on 729664 adults who underwent at least one health screening between 2009 and 2012 from the Korea National Health Insurance Service-Senior Cohort. The study utilized a Cox proportional hazards regression model to assess the relationship between MetS and the risk of developing HI. The results were presented as an adjusted hazard ratio (aHR) with 95% confidence intervals (CI). All subjects were monitored until the occurrence of HI, death, or December 31, 2019. Results: A total of 10102 cases of HI were identified during the follow-up period of 4920397 person-years. In the crude model, MetS was linked to an increased risk of developing HI (HR, 1.14; 95% CI, 1.10-1.19). No significant association was found after adjusting for potential confounding factors (aHR, 1.03; 95% CI, 0.99-1.08). Abnormal triglyceride (TG) levels were associated with a higher risk of HI compared to normal TG levels (aHR, 1.07; 95% CI, 1.03-1.12). In addition, the risk of HI increased as TG levels increased (>150 mg/dL). Conclusion Abnormalities in TG levels were independently associated with an increased risk of HI among elderly adults. Management of TG levels may protect against the risk of incident HI.

Background and Objectives: To investigate the association between metabolic syndrome (MetS) and hearing impairment (HI) in elderly Korean adults using a large-scale cohort data.Subjects and Method Data was collected on 729664 adults who underwent at least one health screening between 2009 and 2012 from the Korea National Health Insurance Service-Senior Cohort. The study utilized a Cox proportional hazards regression model to assess the relationship between MetS and the risk of developing HI. The results were presented as an adjusted hazard ratio (aHR) with 95% confidence intervals (CI). All subjects were monitored until the occurrence of HI, death, or December 31, 2019. Results: A total of 10102 cases of HI were identified during the follow-up period of 4920397 person-years. In the crude model, MetS was linked to an increased risk of developing HI (HR, 1.14; 95% CI, 1.10-1.19). No significant association was found after adjusting for potential confounding factors (aHR, 1.03; 95% CI, 0.99-1.08). Abnormal triglyceride (TG) levels were associated with a higher risk of HI compared to normal TG levels (aHR, 1.07; 95% CI, 1.03-1.12). In addition, the risk of HI increased as TG levels increased (>150 mg/dL). Conclusion Abnormalities in TG levels were independently associated with an increased risk of HI among elderly adults. Management of TG levels may protect against the risk of incident HI.

PURPOSE: I-131 labeled (2'-deoxy-2-iodo-p-D-arabinofuranosyl) adenine (IAD) may be involved in DNA synthesis during active proliferation of tumor cells. We conducted this study to find out the biodistribution of IAD and its feasibility for scintigraphic tumor imaging. MATERIALS AND METHODS: Tosyl acetyl-adenosine was dissolved in acetonitrile, and I-131-NaI was added and heated to synthesize IAD. Female Fisher 344 rats innoculated with breast tumor cells were injected witb 0.27 MBq of IAD. Rats were sacrificed at 0.5, 1, 2, 4, 24h and the % of injected dose per gram of tissue (%ID/g) was determined. For scintigraphy, rats bearing breast cancer were administered with 1.11 MBq of IAD and imaging was perforrned after 2 and 24h. Then, rat body was fixed and rnicrotomized slice was placed on radiographic film for autoradiography, RESULTS: %ID/g of tumor wa.' 0.74 (0.5h), 0.73 (1h), 0.55 (2h), 0.38 (4h), and 0.05 (24h), respectively. At 1h after injection, %ID/g of tumor was higher than that of heart (0.34), liver (0.42), spleen (0.47), kidney (0,69), muscle (0.14), bone (0.33) and intestine (0.51). However, %1D/g of tumor was lower than blood (1.06), lung (0.77), and thyroid (177.71). At 4h, %ID/g of tumor in comparison with other tissue did not change. Tumor contrast expressed by tumor to blood ratio was 0.69 and tumor to muscle ratio was 5.11 at 1h. However, these ratios did not improve through 24h. On autoradiogram and scintigraphy at 2 and 24 hour, the tumor was well visualized. CONCLUSION: This results suggest that Ial) may have a potential for tumor scintigraphy. However, further work is needed to improve localization in tumor tissue.
Adenine ; Animals ; Autoradiography ; Breast Neoplasms* ; Breast* ; DNA ; Female ; Heart ; Hot Temperature ; Humans ; Intestines ; Kidney ; Liver ; Lung ; Radionuclide Imaging* ; Rats* ; Spleen ; Thyroid Gland ; X-Ray Film

BACKGROUND AND OBJECTIVES: The aim of this study is to report the clinical results of maxillary reconstruction with free flap. SUBJECTS AND METHOD: Patients who had undergone free flap reconstruction after maxillectomy from January 2009 to January 2013 were included in the study. The medical records of the maxillary defect classification, the type of flap used for reconstruction, follow-up results including the survival rate of flap and postoperative complications were analyzed retrospectively. RESULTS: A total of 13 cases underwent maxillary reconstruction after maxillectomy. Maxillary resection were classified from Ia to V according to the Brown classlification system, and various composite flaps including rectus abdominis, latissimus dorsi, radial forearm and iliac crest were used. One case (class Ia) was reconstructed with a radial forearm free flap while six cases (classes II, III) were reconstructed with the osteomuscular free flap type, such as iliac crest. Another six cases needed orbital exenteration (class IV, V) and were reconstructed with a soft tissue free flap type, such as a rectus abdominis or latissimus dorsi. Of the 13 cases, four patients had postoperative wound dehiscence and two had preoperative radiotherapy. In all 13 cases, the flaps survived. CONCLUSION: Maxillary reconstructions were performed successfully with various free flaps according to the extent of maxillary defect.
Follow-Up Studies ; Forearm ; Free Tissue Flaps* ; Humans ; Maxilla* ; Medical Records ; Orbit ; Postoperative Complications ; Rectus Abdominis ; Survival Rate