The cytochemical detection of acidic glycoconjugates located in rat gastrointestinal epithelia wa... more The cytochemical detection of acidic glycoconjugates located in rat gastrointestinal epithelia was performed using tissue sections embedded in Lowicryl K4M and cationic colloidal gold (CCG). CCG was prepared from poly-L-lysine and colloidal gold solution (10 nm). The staining of CCG was amplified after a photochemical silver reaction using silver acetate as an ion donor at the light microscopic level. The staining solutions adjusted to pH 2.5, CCG (2.5) and pH 1.0, CCG (1.0) were used for the characterization of carboxylated and sulfated glycoconjugates. At light microscopic level, CCG (2.5) stained several cell types of mucous cells in the rat gastrointestinal tract, while CCG (1.0) stained selectively mucous cells in gastric pits, glandular pylorus, upper crypts of the proximal colon and entire crypts of the distal colon. At the electron microscopic level, both CCG (2.5) and CCG (1.0) labeled the trans side of the Golgi apparatus and mucous granules in some mucous cells. These results are consistent with previous glycoconjugates histochemistry of the rat gastrointestinal tract at both the light and electron microscopic levels. CCG (2.5) and CCG (1.0) staining methods are useful and reliable postembedding staining procedures for the light and electron microscopic demonstration of intra- and extracellular acidic glycoconjugates.
In order to clarify pathogenesis of HAM/TSP, we performed a detailed neuropathologic analysis of ... more In order to clarify pathogenesis of HAM/TSP, we performed a detailed neuropathologic analysis of seven autopsy patients with HAM/TSP. Inflammatory infiltrates of mononuclear cells and degeneration of myelin and axons were noted in the middle to lower thoracic spinal cords and were continuously extended to the entire spinal cord. Horizontal distribution of inflammatory lesions was symmetric at any spinal levels. Immunohistochemical analysis demonstrated T-cell dominance. The numbers of CD4+ T cells and CD8+ T cells were equally present in patients with shorter clinical course. Apoptosis of helper/inducer T cells were observed in the presence of TIA1+ cytotoxic T cells in these active inflammatory lesions. Inflammatory infiltrates were markedly decreased and CD8+/TIA1- T cells were predominated over CD4+ cells in patients with prolonged clinical course. HTLV-1 proviral DNA amounts in the freshly frozen spinal cord measured by quantitative PCR were well correlated with the numbers of infiltrated CD4+ cells. In situ PCR of HTLV-1 proviral DNA using multi-primary pairs demonstrated the presence of HTLV-1 infected cells exclusively in the mononuclear infiltrates of perivascular areas. From these findings, it is suggested that the target of the inflammatory process seen in HAM/TSP lesions may be HTLV-1 infected CD4+ T cells infiltrating the spinal cord.
Expression of dystrophin, beta-spectrin, merosin, and alpha- and beta-sarcoglycans on the vacuola... more Expression of dystrophin, beta-spectrin, merosin, and alpha- and beta-sarcoglycans on the vacuolar membranes in some types of vacuolar myopathies has previously been reported. We studied expression of caveolin-3; alpha-, beta-, gamma-, and delta-sarcoglycans; dystrophin; and merosin on the vacuolar membranes in various vacuolar myopathies. Caveolin-3 and dystrophin were expressed on the vacuolar membranes in lysosomal glycogen storage disease with normal acid maltase, hypokalemic myopathy, and centronuclear myopathy. Sarcoglycans and merosin were expressed only on the vacuolar membrane in lysosomal glycogen storage disease with normal acid maltase. Immunostain of caveolin-3 and sarcoglycans is therefore useful for differential diagnosis of vacuolar myopathies.
We report the pathological changes in skeletal muscle from a patient with acute adult T cell leuk... more We report the pathological changes in skeletal muscle from a patient with acute adult T cell leukemia (ATL). HTLV-I provirus was detected in infiltrating cells using in situ polymerase chain reaction in frozen sections. Furthermore, aberrant expression of the p53 protein was observed in the infiltrating cells. As p53 protein was not observed in mononuclear inflammatory cells in patients with polymyositis, expression of the p53 protein was considered to be one of the characteristic findings in ATL cells. This is the first direct detection of ATL cells in skeletal muscle.
Sulfated glycoconjugates in epithelial cells and mesenchymal cells were investigated after staini... more Sulfated glycoconjugates in epithelial cells and mesenchymal cells were investigated after staining with high iron diamine-thiocarbohydrazide-silver proteinate. One purpose of the experiment was to apply a new physical developed to the staining. Instead of silver nitrate, silver lactate or silver bromide, we used silver acetate as an ion donor. This new method allowed physical development under normal lighting conditions, and resulted in the reduction of background staining even after amplification. As the developer did not contain gum arabic, troublesome treatment was not necessary. The time required for staining was very short and the electron density of the final reaction product was high and easily identifiable under the electron microscope. Fixing was not necessary. Very small amounts of reactive substance were detectable after physical development. This developmental procedure has been applied to both the preembedding staining and postembedding staining of sulfated glycoconjugates. The results obtained using this method are presented.
A patient, 50-year-old female, developed progressive weakness of lower extremities, and gait dist... more A patient, 50-year-old female, developed progressive weakness of lower extremities, and gait disturbance for 2 years. Neurological examination revealed hyperreflexia with pathological reflex, fasciculation in the limbs and tongue, muscle weakness and atrophy in distal limbs, but no sensory disturbance. Needle EMG showed neurogenic findings compatible with motor neuron disease (MND). Laboratory data showed polyclonal IgM hyperimmunoglobulinemia, positive several autoimmune antibodies including antisingle strand DNA antibody (Ab), ENAab, SS-A ab and RA. There were no antibodies for gangliosides and Myelin-associated glycoprotein (MAG), but positive antibody for 54KD protein of cerebral gray and white matter. The clinical manifestations including gait disturbance and muscle weakness, and serum IgM level were moderately improved by plasmapheresis which is considered important for consideration of causes of MND.
Proceedings of the National Academy of Sciences, 1998
CD45 is a family of transmembrane protein tyrosine phosphatases exclusively expressed by hematopo... more CD45 is a family of transmembrane protein tyrosine phosphatases exclusively expressed by hematopoietic cells and critically involved in the regulation of T cell activation signals. We now demonstrate that three 100-μg doses of anti-CD45RB mAb MB23G2 can induce long-term engraftment of islets into major histcompatibility complex-disparate chemically diabetic mice. Long-term graft survivors (>120 days) were tolerant to new islet allografts from the original donor strain. MB23G2 induced a temporary decrease in number circulating leukocytes but had no effect on leukocyte number in other lymphoid compartments. Histologic examination of allografts from treated and untreated recipients revealed a similar peri-islet infiltration on day 6. Eleven days after transplant, the peri-islet infiltrate in treated animals persisted, but in marked contrast to untreated control animals, there was no insulitis and islet integrity was preserved. The peri-islet infiltrate from treated animals showed a ...
The cytochemical detection of acidic glycoconjugates located in rat gastrointestinal epithelia wa... more The cytochemical detection of acidic glycoconjugates located in rat gastrointestinal epithelia was performed using tissue sections embedded in Lowicryl K4M and cationic colloidal gold (CCG). CCG was prepared from poly-L-lysine and colloidal gold solution (10 nm). The staining of CCG was amplified after a photochemical silver reaction using silver acetate as an ion donor at the light microscopic level. The staining solutions adjusted to pH 2.5, CCG (2.5) and pH 1.0, CCG (1.0) were used for the characterization of carboxylated and sulfated glycoconjugates. At light microscopic level, CCG (2.5) stained several cell types of mucous cells in the rat gastrointestinal tract, while CCG (1.0) stained selectively mucous cells in gastric pits, glandular pylorus, upper crypts of the proximal colon and entire crypts of the distal colon. At the electron microscopic level, both CCG (2.5) and CCG (1.0) labeled the trans side of the Golgi apparatus and mucous granules in some mucous cells. These results are consistent with previous glycoconjugates histochemistry of the rat gastrointestinal tract at both the light and electron microscopic levels. CCG (2.5) and CCG (1.0) staining methods are useful and reliable postembedding staining procedures for the light and electron microscopic demonstration of intra- and extracellular acidic glycoconjugates.
In order to clarify pathogenesis of HAM/TSP, we performed a detailed neuropathologic analysis of ... more In order to clarify pathogenesis of HAM/TSP, we performed a detailed neuropathologic analysis of seven autopsy patients with HAM/TSP. Inflammatory infiltrates of mononuclear cells and degeneration of myelin and axons were noted in the middle to lower thoracic spinal cords and were continuously extended to the entire spinal cord. Horizontal distribution of inflammatory lesions was symmetric at any spinal levels. Immunohistochemical analysis demonstrated T-cell dominance. The numbers of CD4+ T cells and CD8+ T cells were equally present in patients with shorter clinical course. Apoptosis of helper/inducer T cells were observed in the presence of TIA1+ cytotoxic T cells in these active inflammatory lesions. Inflammatory infiltrates were markedly decreased and CD8+/TIA1- T cells were predominated over CD4+ cells in patients with prolonged clinical course. HTLV-1 proviral DNA amounts in the freshly frozen spinal cord measured by quantitative PCR were well correlated with the numbers of infiltrated CD4+ cells. In situ PCR of HTLV-1 proviral DNA using multi-primary pairs demonstrated the presence of HTLV-1 infected cells exclusively in the mononuclear infiltrates of perivascular areas. From these findings, it is suggested that the target of the inflammatory process seen in HAM/TSP lesions may be HTLV-1 infected CD4+ T cells infiltrating the spinal cord.
Expression of dystrophin, beta-spectrin, merosin, and alpha- and beta-sarcoglycans on the vacuola... more Expression of dystrophin, beta-spectrin, merosin, and alpha- and beta-sarcoglycans on the vacuolar membranes in some types of vacuolar myopathies has previously been reported. We studied expression of caveolin-3; alpha-, beta-, gamma-, and delta-sarcoglycans; dystrophin; and merosin on the vacuolar membranes in various vacuolar myopathies. Caveolin-3 and dystrophin were expressed on the vacuolar membranes in lysosomal glycogen storage disease with normal acid maltase, hypokalemic myopathy, and centronuclear myopathy. Sarcoglycans and merosin were expressed only on the vacuolar membrane in lysosomal glycogen storage disease with normal acid maltase. Immunostain of caveolin-3 and sarcoglycans is therefore useful for differential diagnosis of vacuolar myopathies.
We report the pathological changes in skeletal muscle from a patient with acute adult T cell leuk... more We report the pathological changes in skeletal muscle from a patient with acute adult T cell leukemia (ATL). HTLV-I provirus was detected in infiltrating cells using in situ polymerase chain reaction in frozen sections. Furthermore, aberrant expression of the p53 protein was observed in the infiltrating cells. As p53 protein was not observed in mononuclear inflammatory cells in patients with polymyositis, expression of the p53 protein was considered to be one of the characteristic findings in ATL cells. This is the first direct detection of ATL cells in skeletal muscle.
Sulfated glycoconjugates in epithelial cells and mesenchymal cells were investigated after staini... more Sulfated glycoconjugates in epithelial cells and mesenchymal cells were investigated after staining with high iron diamine-thiocarbohydrazide-silver proteinate. One purpose of the experiment was to apply a new physical developed to the staining. Instead of silver nitrate, silver lactate or silver bromide, we used silver acetate as an ion donor. This new method allowed physical development under normal lighting conditions, and resulted in the reduction of background staining even after amplification. As the developer did not contain gum arabic, troublesome treatment was not necessary. The time required for staining was very short and the electron density of the final reaction product was high and easily identifiable under the electron microscope. Fixing was not necessary. Very small amounts of reactive substance were detectable after physical development. This developmental procedure has been applied to both the preembedding staining and postembedding staining of sulfated glycoconjugates. The results obtained using this method are presented.
A patient, 50-year-old female, developed progressive weakness of lower extremities, and gait dist... more A patient, 50-year-old female, developed progressive weakness of lower extremities, and gait disturbance for 2 years. Neurological examination revealed hyperreflexia with pathological reflex, fasciculation in the limbs and tongue, muscle weakness and atrophy in distal limbs, but no sensory disturbance. Needle EMG showed neurogenic findings compatible with motor neuron disease (MND). Laboratory data showed polyclonal IgM hyperimmunoglobulinemia, positive several autoimmune antibodies including antisingle strand DNA antibody (Ab), ENAab, SS-A ab and RA. There were no antibodies for gangliosides and Myelin-associated glycoprotein (MAG), but positive antibody for 54KD protein of cerebral gray and white matter. The clinical manifestations including gait disturbance and muscle weakness, and serum IgM level were moderately improved by plasmapheresis which is considered important for consideration of causes of MND.
Proceedings of the National Academy of Sciences, 1998
CD45 is a family of transmembrane protein tyrosine phosphatases exclusively expressed by hematopo... more CD45 is a family of transmembrane protein tyrosine phosphatases exclusively expressed by hematopoietic cells and critically involved in the regulation of T cell activation signals. We now demonstrate that three 100-μg doses of anti-CD45RB mAb MB23G2 can induce long-term engraftment of islets into major histcompatibility complex-disparate chemically diabetic mice. Long-term graft survivors (>120 days) were tolerant to new islet allografts from the original donor strain. MB23G2 induced a temporary decrease in number circulating leukocytes but had no effect on leukocyte number in other lymphoid compartments. Histologic examination of allografts from treated and untreated recipients revealed a similar peri-islet infiltration on day 6. Eleven days after transplant, the peri-islet infiltrate in treated animals persisted, but in marked contrast to untreated control animals, there was no insulitis and islet integrity was preserved. The peri-islet infiltrate from treated animals showed a ...
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Papers by Nobuyuki KASHIO