Biomedical Research
Online ISSN : 1880-313X
Print ISSN : 0388-6107
ISSN-L : 0388-6107
37 巻 , 1 号
選択された号の論文の8件中1~8を表示しています
Full Papers
  • Fuminori IWASA, Kazuyoshi BABA, Takahiro OGAWA
    2016 年 37 巻 1 号 p. 1-11
    発行日: 2016/02/01
    公開日: 2016/02/25
    ジャーナル フリー
    Ultraviolet (UV) light treatment of titanium immediately prior to use, or photofunctionalization, reactivates the time-dependent degradation of bioactivity of titanium (biological aging of titanium) and increases its osseointegration capacity beyond the inherent maximal level. Although the initial osteoblast attachment is reportedly enhanced on UV-treated titanium surfaces, the detailed mechanism behind the increase in osseointegration is unknown. This study examined the potential modulation of intracellular signaling pathway in osteoblasts on UV-treated titanium surfaces. Rat bone marrow-derived osteoblasts were cultured on 4-week-old, new, and UV-treated titanium surfaces. The new and UV-treated surfaces were superhydrophilic, whereas the 4-week-old surface was hydrophobic. Although the rate of protein adsorption was similarly increased on the new and UV-treated surfaces compared with the 4-week-old surface, the number of attached cells and their spreading behavior were further enhanced on the UV-treated surface. This additional enhancement was associated with the remarkably upregulated expression of paxillin and phospho-paxillin and exclusive upregulation of Rho GTPase family genes. This study provides with the first molecular evidence of the enhanced initial behavior of osteoblasts on UV-treated titanium surfaces. The enhancement was accentuated and distinct from the new titanium surface with similar hydrophilicity, suggesting that surface properties other than the level of hydrophilicity are responsible.
  • Takuya FUJITA, Shin-ichiro KARAKI, Takashi TATEOKA, Atsukazu KUWAHARA
    2016 年 37 巻 1 号 p. 13-20
    発行日: 2016/02/01
    公開日: 2016/02/25
    ジャーナル フリー
    The purpose of this study was to clarify the mode of desacetyl bisacodyl (DAB)-induced secretory action in intestinal tissues using an Ussing chamber assay. DAB is the active metabolite of the laxative bisacodyl. In mucosal-submucosal preparations, mucosal application of DAB induced a transient decrease followed by subsequent increases in short-circuit current and tissue conductance in a concentration-dependent manner. DAB-induced responses occurred from the middle colon to the rectal segment but not in the proximal colon. Moreover, these responses were not observed under chloride (Cl)-free conditions or in the presence of DAB on the serosal side of the mucosalsubmucosal specimens. Treatment with tetrodotoxin had no effect on the DAB-induced responses; however, mucosal treatment with a COX inhibitor piroxicam resulted in the elimination of responses. These results suggest that DAB may contribute to the laxative action by inducing Cl secretion which is associated with the COX signaling pathway. This study also demonstrated that the DAB target molecule is present on the mucosal side from the middle colon to the rectal segment.
  • Shoichiro KAMEOKA, Takeshi KAMEYAMA, Takaya HAYASHI, Seiichi SATO, Nao ...
    2016 年 37 巻 1 号 p. 21-27
    発行日: 2016/02/01
    公開日: 2016/02/25
    ジャーナル フリー
    More than 50% of people in the world are infected with Helicobacter pylori (H. pylori), which induces various gastric diseases. Especially, epidemiological studies have shown that H. pylori infection is a major risk factor for gastric cancer. It has been reported that the levels of interleukin (IL)-1β are upregulated in gastric tissues of patients with H. pylori infection. In this study, we investigated the induction mechanism of IL-1β during H. pylori infection. We found that IL-1βmRNA and protein were induced in phorbol-12-myristate-13-acetate (PMA)-differentiated THP-1 cells after H. pylori infection. This IL-1β production was inhibited by a caspase-1 inhibitor and a ROS inhibitor. Furthermore, K+ efflux and Ca2+ signaling were also involved in this process. These data suggest that NOD-like receptor (NLR) family, pyrin domain containing 3 (NLRP3) and its complex, known as NLRP3 inflammasome, are involved in IL-1β production during H. pylori infection because it is reported that NLRP3 inflammasome is activated by ROS, K+ efflux and/or Ca2+ signaling. These findings may provide therapeutic strategy for the control of gastric cancer in H. pylori-infected patients.
  • Lingyang TIAN, Takuichi SATO, Kousuke NIWA, Mitsuo KAWASE, Gen MAYANAG ...
    2016 年 37 巻 1 号 p. 29-36
    発行日: 2016/02/01
    公開日: 2016/02/25
    ジャーナル フリー
    The onset of plaque-mediated disease, including dental caries and periodontal diseases, is highly associated with compositional change of the resident microflora from the ecological perspective. As specific bacterial profiles have been linked to different disease stages, microbial compositional measurements might therefore have great value for clinical diagnosis. Previously we have reported a dry-reagent strip biosensor–PCR-dipstick DNA chromatography, which utilized molecular recognition of oligonucleotides and biotin-streptavidin, and the optical property of colored microspheres, for semiquantifying a five-membered subgroup of caries-associated bacterial species in supragingival plaque from healthy coronal surfaces of teeth. The present study aimed to evaluate this technique’s ability to differentiate microflora by comparing the subset profiles. Sixteen subgingival plaque specimens were pooled from periodontal pockets and analyzed for the composition of Streptococcus mutans, Streptococcus sobrinus, Scardovia wiggsiae, Actinomyces sp. and Veillonella parvula. Detection frequencies, relative abundance of each bacterial species, and the five-membered bacterial profiles were compared between supra- and subgingival groups. The supragingival plaque harbored significantly more of the tested species and higher amount of Actinomyces sp. and V. parvula. In subgingival plaque, the predominance was obscured, since several highly overlapped profiles were found at comparable frequencies. Thus, PCR-dipstick DNA chromatography using the same plaque sample enabled simultaneous profiling of multiple species at species level and facilitated discrimination between anticipated different microflora, making this technique a promising chair-side microbiota profiling method.
  • Kasumi MORIGUCHI-MORI, Hironori HIGASHIO, Kanako ISOBE, Miho KUMAGAI, ...
    2016 年 37 巻 1 号 p. 37-49
    発行日: 2016/02/01
    公開日: 2016/02/25
    ジャーナル フリー
    Adenosine 5’-triphosphate (ATP) can act as an extracellular signal that regulates various cellular functions. The present study aimed to determine which purinoceptors play a role in ATP-induced changes in intracellular Ca2+ ([Ca2+]i) and amylase secretion in mouse parotid glands. ATP induced a steep increase in [Ca2+]i in acinar cells. The removal of extracellular Ca2+ or the use of Ca2+ channel blockers slightly inhibited this increase. Inhibition of PLCγ by U73122 and of IP3 by xestospongin C did not completely block this increase. The purinoceptor antagonists suramin and reactive blue-2 strongly inhibited the ATP-induced changes in [Ca2+]i. 2-MeSATP induced a strong increase in [Ca2+]i, while Bz-ATP induced a small [Ca2+]i increase, and UTP and α,β-MeATP had no effect. The potency order of ATP analogs (2-MeSATP > ATP >> UTP) suggested that P2Y1 and P2Y12 play a significant role in the cellular response to ATP. RT-PCR revealed that P2X2,4,7 and P2Y1,2,10,12,14 were expressed in acinar cells. Ca2+-dependent exocytotic secretion of amylase was detected in parotid glands. These findings indicated that ATP activates P2Y receptors more than P2X receptors at low concentrations. Thus, P2Y receptors were found to be the main receptors involved in Ca2+-related cell homeostasis and amylase secretion in mouse parotid glands.
  • Kenichi URAKAMI, Yuji SHIMODA, Keiichi OHSHIMA, Takeshi NAGASHIMA, Mas ...
    2016 年 37 巻 1 号 p. 51-62
    発行日: 2016/02/01
    公開日: 2016/02/25
    ジャーナル フリー
    Next-generation DNA sequencing (NGS) of the genomes of cancer cells is contributing to new discoveries that illuminate the mechanisms of tumorigenesis. To this end, the International Cancer Genome Consortium and The Cancer Genome Atlas are investigating novel alterations of genes that will define the pathways and mechanisms of the development and growth of cancers. These efforts contribute to the development of innovative pharmaceuticals as well as to the introduction of genome sequencing as a component of personalized medicine. In particular, chromosomal translocations that fuse coding sequences serve as important pharmaceutical targets and diagnostic markers given their association with tumorigenesis. Although increasing numbers of fusion genes are being discovered using NGS, the methodology used to identify such fusion genes is complicated, expensive, and requires relatively large samples. Here, to address these problems, we describe the design and development of a panel of 491 fusion genes that performed well in the analysis of cultured human cancer cell lines and 600 clinical tumor specimens.
  • Katsuhisa NAGAI, Yojiro YANAGAWA, Seiji KATAGIRI, Masashi NAGANO
    2016 年 37 巻 1 号 p. 63-71
    発行日: 2016/02/01
    公開日: 2016/02/25
    ジャーナル フリー
    To clarify the relationship between ovarian reserve and the developmental competence of bovine oocytes, oocyte-granulosa complexes (OGCs) collected from early antral follicles (≤1 mm) in ovaries with high (≥25) and low (<25) antral follicle counts (AFCs) were used. OGCs derived from different AFC groups were cultured for growth followed by maturation, fertilization and blastocyst formation. Viability of OGCs during growth culture was similar between groups; however, OGCs in the high-AFC group had a larger number of granulosa cells than the low-AFC group at 12 days of growth. The proportion of matured oocytes in the high-AFC group was higher than that in the low-AFC group. Mitochondrial activity of oocytes before maturation in the high-AFC group was higher than that in the low-AFC group; however, accumulation of reactive oxygen species was similar between groups. Cleavage rate in the high-AFC group tended to be higher than that in the low-AFC group, although blastocyst development was similar between groups. In conclusion, oocytes derived from ovaries with high AFC have higher maturational ability and fertilizability than those from low AFC. The difference may be caused by high proliferation of granulosa cells from ovaries with high AFC.
Communication
  • Nobusuke SHIBATA, Toshiki MATSUNAGA, Daisuke KUDO, Kana SASAKI, Takash ...
    2016 年 37 巻 1 号 p. 73-76
    発行日: 2016/02/01
    公開日: 2016/02/25
    ジャーナル フリー
    The purpose of this study was to compare postcontraction hyperemia after electrical stimulation between patients with upper extremity paralysis caused by upper motor neuron diseases and healthy controls. Thirteen healthy controls and eleven patients with upper extremity paralysis were enrolled. The blood flow in the basilic vein was measured by ultrasound before the electrical stimulation of the biceps brachii muscle and 30 s after the stimulation. The stimulation was performed at 10 mA and at a frequency of 70 Hz for 20 s. The mean blood flow in the healthy control group and in upper extremity paralysis group before the electrical stimulation was 60 ± 20 mL/min (mean ± SD) and 48 ± 25 mL/min, respectively. After the stimulation, blood flow in both groups increased to 117 ± 23 mL/min and 81 ± 41 mL/min, respectively. We show that it is possible to measure postcontraction hyperemia using an ultrasound system. In addition, blood flow in both groups increased after the electrical stimulation because of postcontraction hyperemia. These findings suggest that evaluating post contraction hyperemia in patients with upper extremity paralysis can assess rehabilitation effects.
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