Spatially Continuous Non-Contact Cold Sensation Presentation Based on Low-Temperature Airflows

Our perception of cold enriches our understanding of the world and allows us to interact with it. Therefore, the presentation of cold sensations will be beneficial in improving the sense of immersion and presence in virtual reality and the metaverse. This study proposed a novel method for spatially continuous cold sensation presentation based on low-temperature airflows. We defined the shortest distance between two airflows perceived as different cold stimuli as a local cold stimulus group discrimination threshold (LCSGDT). By setting the distance between airflows within the LCSGDT, spatially continuous cold sensations can be achieved with an optimal number of cold airflows. We hypothesized that the LCSGDTs are related to the heat-transfer capability of airflows and developed a model to relate them. We investigated the LCSGDTs at a flow rate of 25 L/min and presentation distances ranging from 10 to 50 mm. The results showed that under these conditions, the LCSGDTs are 131.4 $\pm$ 1.9 mm, and the heat-transfer capacity of the airflow corresponding to these LCSGDTs is an almost constant value, that is, 0.92.Comment: 7 page

Application of hot spring pool training in outpatients with chronic diseases and its clinical evaluation

1996年4月より6月までの3ヵ月間に,三朝分院内の温泉プールで水泳ないし歩行訓練を受けた内科外来患者は延べ2109例(実数213例)で,外来患者総数(延べ6848例)に対する利用率は30.8%であった｡これらの対象症例について,リハビリテーション受診カードにより,性別,年令別,疾患別の検討を行った｡その結果,性別では女性が多く(72.3%),年齢別では50才以上の患者が多い(80.3%)傾向が見られた｡また,地域別検討では,鳥取県内からの患 者が多い(88.3%)傾向であった。さらに,1996年12月より1997年1月へかけて,アンケート調査を行い(集計数;64例)継続期間,利用回数,効果を感じた期間,効果のあった症状などについて疾患別に比較検討した｡その結果,慢性閉塞性肺疾患を主とした呼吸器疾患では,週に1～2回の利用回数(50.0%)で長期間(3年以上:52.9%)続けている患者が多い傾向であった｡また慢性関節リウマチ,腰痛などの慢性疼痛性疾患では,訓練期間は比較的短期間であっ たが（3年以下:52.9%),利用回数は週に3～5回(38.0%)と多い傾向が見られた。温泉プール訓練では,疾患本来の症状改善に加えて,全身状態の改善,精神的リラックス,気分転換などを感じていることが示唆された｡For three months from April to June in 1996, 2109(30.8%) of 6848 outpatients (the total number) had swimming and walking traning in a hot spring pool. Of the 213 patients (the actual number), the numbers of female patients (72.3%), of patients over the age of 50 (80.3%), and of those coming inside Tottori prefecture (88.3%) were larger in analysis by the consultation cards for rehabillitation. The results of questionnaire from the patients performed from December 1996 to January 1997 demonstrated that patients with chronic respiratory disease had pool training 1 to 2 times a week (50.0%) and for longer term (more than 3 years, 52.9%), and patients with chronic pain disease had the training 3 to 5 times a week (38.0%) and for shoter term (less than 3 years, 61.9%). It was suggested from the results that tha training in a hot spring pool improved subjective and objective symptoms of each disease, and, furthermore, brought about improvement of general condition, psychological relaxation, and a change of feeling

Characterization of the gut microbiota of Kawasaki disease patients by metagenomic analysis

Kawasaki disease (KD) is an acute febrile illness of early childhood. Previous reports have suggested that genetic disease susceptibility factors, together with a triggering infectious agent, could be involved in KD pathogenesis; however, the precise etiology of this disease remains unknown. Additionally, previous culture-based studies have suggested a possible role of intestinal microbiota in KD pathogenesis. In this study, we performed metagenomic analysis to comprehensively assess the longitudinal variation in the intestinal microbiota of twenty-eight KD patients. Several notable bacterial genera were commonly extracted during the acute phase, whereas a relative increase in the number of Ruminococcus bacteria was observed during the non-acute phase of KD. The metagenomic analysis results based on bacterial species classification suggested that the number of sequencing reads with similarity to five Streptococcus spp. (S. pneumonia, pseudopneumoniae, oralis, gordonii, and sanguinis), in addition to patient-derived Streptococcus isolates, markedly increased during the acute phase in most patients. Streptococci include a variety of pathogenic bacteria and probiotic bacteria that promote human health; therefore, this further species discrimination could comprehensively illuminate the KD-associated microbiota. The findings of this study suggest that KD-related Streptococci might be involved in the pathogenesis of this disease

Transforming growth factor-β1 stimulates collagen matrix remodeling through increased adhesive and contractive potential by human renal fibroblasts

AbstractRenal tubulointerstitial fibrosis is the common final pathway leading to end-stage renal failure. Tubulointerstitial fibrosis is characterized by fibroblast proliferation and excessive matrix accumulation. Transforming growth factor-β1 (TGF-β1) has been implicated in the development of renal fibrosis accompanied by α-smooth muscle actin (α-SMA) expression in renal fibroblasts. To investigate the molecular and cellular mechanisms involved in tubulointerstitial fibrosis, we examined the effect of TGF-β1 on collagen type I (collagen) gel contraction, an in vitro model of scar collagen remodeling. TGF-β1 enhanced collagen gel contraction by human renal fibroblasts in a dose- and time-dependent manner. Function-blocking anti-α1 or anti-α2 integrin subunit antibodies significantly suppressed TGF-β1-stimulated collagen gel contraction. Scanning electron microscopy showed that TGF-β1 enhanced the formation of the collagen fibrils by cell attachment to collagen via α1β1 and α2β1 integrins. Flow cytometry and cell adhesion analyses revealed that the stimulation of renal fibroblasts with TGF-β1 enhanced cell adhesion to collagen via the increased expression of α1 and α2 integrin subunits within collagen gels. Fibroblast migration to collagen was not up-regulated by TGF-β1. Furthermore, TGF-β1 increased the expression of a putative contractile protein, α-SMA, by human renal fibroblasts in collagen gels. These results suggest that TGF-β1 stimulates fibroblast–collagen matrix remodeling by increasing both integrin-mediated cell attachment to collagen and α-SMA expression, thereby contributing to pathological tubulointerstitial collagen matrix reorganization in renal fibrosis

Peptidoglycan recognition protein-triggered induction of Escherichia coli gene in Drosophila melanogaster

Interaction between the host and pathogen determines the fate of both organisms during the infectious state. The host is equipped with a battery of immune reactions, while the pathogen displays a variety of mechanisms to compromise host immunity. Although bacteria alter their pattern of gene expression in host organisms, studies to elucidate the mechanism behind this are only in their infancy. We here examined the possibility that host immune proteins directly participate in the change of gene expression in bacteria. Escherichia coli was treated with a mixture of the extracellular region of peptidoglycan recognition protein (PGRP)-LC and the antimicrobial peptide attacin of Drosophila, and subjected to DNA microarray analysis for mRNA repertoire. We identified 133 annotated genes whose mRNA increased after the treatment, and at least four of them were induced in response to PGRP-LC. One such gene, lipoprotein-encoding nlpI, showed a transient increase of mRNA in adult flies depending on PGRP-LC but not PGRP-LE. NlpI-lacking E. coli had a lowered growth rate and/or viability in flies than the parental strain. These results suggest that a host immune receptor triggers a change of gene expression in bacteria simultaneously with their recognition and induction of immune responses. © The Authors 2015. Published by Oxford University Press on behalf of the Japanese Biochemical Society. All rights reserved

Inhibition of phagocytic killing of Escherichia coli in Drosophila Hemocytes by RNA Chaperone Hfq

An RNA chaperone of Escherichia coli, called host factor required for phage Qb RNA replication (Hfq), forms a complex with small noncoding RNAs to facilitate their binding to target mRNA for the alteration of translation efficiency and stability. Although the role of Hfq in the virulence and drug resistance of bacteria has been suggested, how this RNA chaperone controls the infectious state remains unknown. In the present study, we addressed this issue using Drosophila melanogaster as a host for bacterial infection. In an assay for abdominal infection using adult flies, an E. coli strain with mutation in hfq was eliminated earlier, whereas flies survived longer compared with infection with a parental strain. The same was true with flies deficient in humoral responses, but the mutant phenotypes were not observed when a fly line with impaired hemocyte phagocytosis was infected. The results from an assay for phagocytosis in vitro revealed that Hfq inhibits the killing of E. coli by Drosophila phagocytes after engulfment. Furthermore, Hfq seemed to exert this action partly through enhancing the expression of s38, a stress-responsive s factor that was previously shown to be involved in the inhibition of phagocytic killing of E. coli, by a posttranscriptional mechanism. Our study indicates that the RNA chaperone Hfq contributes to the persistent infection of E. coli by maintaining the expression of bacterial genes, including one coding for s38, that help bacteria evade host immunity. ©2016 by The American Association of Immunologists, Inc.Embargo Period 12 month