PEST domain-enriched tyrosine phosphatase (PEP) regulation of effector/memory T cells     

Hasegawa K  Martin F  Huang G  Tumas D  Diehl L  Chan AC 《Science (New York, N.Y.)》2004,303(5658):685-689

Protein tyrosine kinases and phosphatases cooperate to regulate normal immune cell function. We examined the role of PEST domain-enriched tyrosine phosphatase (PEP) in regulating T cell antigen-receptor function during thymocyte development and peripheral T cell differentiation. Although normal na?ve T cell functions were retained in pep-deficient mice, effector/memory T cells demonstrated enhanced activation of Lck. In turn, this resulted in increased expansion and function of the effector/memory T cell pool, which was also associated with spontaneous development of germinal centers and elevated serum antibody levels. These results revealed a central role for PEP in negatively regulating specific aspects of T cell development and function.  相似文献   

Neurons in monkey prefrontal cortex that track past or predict future performance     

Hasegawa RP  Blitz AM  Geller NL  Goldberg ME 《Science (New York, N.Y.)》2000,290(5497):1786-1789

Although frontal cortex is thought to be important in controlling behavior across long periods of time, most studies of this area concentrate on neuronal responses instantaneously relevant to the current task. In order to investigate the relationship of frontal activity to behavior over longer time periods, we trained rhesus monkeys on a difficult oculomotor task. Their performance fluctuated during the day, and the activity of prefrontal neurons, even measured while the monkeys waited for the targets to appear at the beginning of each set of trials, correlated with performance in a probabilistic rather than a determinist manner: neurons reflected past or predicted future performance, much more than they reflected current performance. We suggest that this activity is related to processes such as arousal or motivation that set the tone for behavior rather than controlling it on a millisecond basis, and could result from ascending pathways that utilize slow, second-messenger synaptic processes.  相似文献   

Ecology of Armillaria species on conifers in Japan     

E. Hasegawa  Y. Ota  T. Hattori  N. Sahashi  T. Kikuchi 《Forest Pathology》2011,41(6):429-437

Distribution, host preference and pathogenicity of Japanese Armillaria species on conifers were investigated on the basis of field collections of 65 isolates. We identified seven Armillaria species from 19 conifer species including six major Japanese plantation conifers using mating tests and sequences of the translation elongation‐1 α gene. Armillaria mellea, Armillaria ostoyae, Armillaria cepistipes and Armillaria sinapina were frequently collected, whereas Armillaria nabsnona, Armillaria tabescens and a biological species Nagasawa’s E were rare. On the basis of host condition when the isolates were collected, A. mellea, A. ostoyae, A. cepistipes and A. tabescens are considered as moderate to aggressive pathogens of conifers in Japan.  相似文献   

Analysis of limonoid glucosides from citrus by electrospray ionization liquid chromatography-mass spectrometry   总被引：3，自引：0，他引：3  

Schoch TK  Manners GD  Hasegawa S 《Journal of agricultural and food chemistry》2001,49(3):1102-1108

An electrospray ionization liquid chromatography-mass spectrometry (ESI-LC-MS) method for the detection and quantitation of limonoid glucosides has been developed. Negative ions [M - H(+)](-) characteristic of six limonoid glucosides can be detected and quantified from selected ion monitoring chromatograms using carminic acid as an internal standard. The described method has been applied to the analysis of limonoid glucoside content in various liquid and solid Citrus spp. samples as well as complex mixtures of partially purified limonoid glucosides. Rapid and sensitive qualitative screening of samples for limonoid glucosides can also be accomplished with slight modifications of the method.  相似文献   

Glycated hemoglobin fractions in normal and diabetic dogs measured by high performance liquid chromatography.   总被引：1，自引：0，他引：1  

S Hasegawa  T Sako  N Takemura  H Koyama  S Motoyoshi 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》1991,53(1):65-68

We established a new analytical condition to measure the canine glycated hemoglobin by high performance liquid chromatography (HPLC) using cation exchange column. The canine hemoglobin gave five peaks consisting of 2 major and 3 minor hemoglobin fractions such as HbA1a, HbA1b and HbA1c. Measurement was done in 38 clinically normal dogs and 10 diabetic dogs. Mean HbA1c values (% of total Hb) in normal and diabetic dogs were 2.60 and 6.41%, respectively. And mean HbA1 values were 3.58 and 7.41%, respectively. The mean values of the canine HbA1c and HbA1 in diabetic dogs was higher than those in normal dogs, significantly (p less than 0.01). Advantages of the HPLC method and applicability for monitoring effectiveness of insulin therapy in the canine diabetes mellitus are discussed.  相似文献   

A lactate dehydrogenase anomaly in a cat     

H Iwata  K Yasuda  K Ono  A Hasegawa  I Tomoda 《Nippon juigaku zasshi. The Japanese journal of veterinary science》1986,48(1):145-148

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Interleukin 1 alpha mRNA-expressing cells on the local inflammatory response in feline infectious peritonitis.   总被引：1，自引：0，他引：1  

T Hasegawa  A Hasegawa 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》1991,53(6):995-999

By in situ hybridization with biotinylated human interleukin 1 alpha (IL-1 alpha) cDNA probe, distribution of feline IL-1 alpha mRNA-expressing cells was examined in the tissues from 49 cases diagnosed as feline infectious peritonitis (FIP) by pathological examination. IL-1 alpha mRNA-expressing cells were found in visceral peritoneum, lymphoid organs, liver, kidney, pancreas, digestive tract, lung, pleura, brain, palpebral conjunctiva, and bone marrow. Hybridization signals for IL-1 alpha mRNA were mostly located in the local inflammatory lesions on the serosal surface of various organs and omentum, which were frequently involved in the lesions of FIP (27.8 +/- 5.1 cells/mm2). Morphological examination suggested that they were infiltrated macrophages. However, few IL-1 alpha mRNA-expressing macrophages were in the lesions of other organs. These data suggested that IL-1 alpha produced from macrophages in the local inflammatory sites might participate in the initiation and development of the lesions on the visceral peritoneum in FIP.  相似文献   

Feline interleukin 1 derived from alveolar macrophages stimulated with lipopolysaccharide     

R Goitsuka  Y Hirota  A Hasegawa  I Tomoda 《Nippon juigaku zasshi. The Japanese journal of veterinary science》1987,49(4):631-636

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A cytochemical study on feline blood cells   总被引：1，自引：0，他引：1  

H Tsujimoto  A Hasegawa  I Tomoda 《Nippon juigaku zasshi. The Japanese journal of veterinary science》1983,45(3):373-382

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Experimental transmission of rabbit syphilis     

Saito K  Tagawa M  Mimura M  Hasegawa A 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2005,67(1):79-81

Rabbit syphilis was experimentally transmitted from clinical cases to healthy rabbits. The purpose was to evaluate changes in RPR titers during the course of infection and to detect the pathogenic organism. Two of three littermate rabbits were inoculated topically. One rabbit became symptomatic, with typical clinical signs on its genitalia about 8 weeks after inoculation and a marked rise in RPR titers, another remained asymptomatic with a moderate rise in titers, and the control rabbit remained negative. These results supported the specific relationship between clinical signs and RPR titers. Histopathological examination of the skin lesion from the symptomatic rabbit revealed spirochetes.  相似文献