LIVIVO - The Search Portal for Life Sciences

zur deutschen Oberfläche wechseln
Advanced search

Search results

Result 1 - 10 of total 1049

Search options

  1. Article ; Online: Cell sorting in vitro and in vivo: How are cadherins involved?

    Takeichi, Masatoshi

    Seminars in cell & developmental biology

    2022  Volume 147, Page(s) 2–11

    Abstract: Animal tissues are composed of heterogenous cells, and their sorting into different compartments of the tissue is a pivotal process for organogenesis. Cells accomplish sorting by themselves-it is well known that singly dispersed cells can self-organize ... ...

    Abstract Animal tissues are composed of heterogenous cells, and their sorting into different compartments of the tissue is a pivotal process for organogenesis. Cells accomplish sorting by themselves-it is well known that singly dispersed cells can self-organize into tissue-like structures in vitro. Cell sorting is regulated by both biochemical and physical mechanisms. Adhesive proteins connect cells together, selecting particular partners through their specific binding properties, while physical forces, such as cell-cortical tension, control the cohesiveness between cells and in turn cell assembly patterns in mechanical ways. These processes cooperate in determining the overall cell sorting behavior. This article focuses on the 'cadherin' family of adhesion molecules as a biochemical component of cell-cell interactions, addressing how they regulate cell sorting by themselves or by cooperating with other factors. New ideas beyond the classical models of cell sorting are also discussed.
    MeSH term(s) Animals ; Cadherins/metabolism ; Cell Adhesion/physiology ; Cell Communication ; Cell Movement
    Chemical Substances Cadherins
    Language English
    Publishing date 2022-11-12
    Publishing country England
    Document type Journal Article ; Review ; Research Support, Non-U.S. Gov't
    ZDB-ID 1312473-0
    ISSN 1096-3634 ; 1084-9521
    ISSN (online) 1096-3634
    ISSN 1084-9521
    DOI 10.1016/j.semcdb.2022.11.004
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  2. Article ; Online: Comprehension of degraded speech sounds with m-sequence modulation: an fMRI study.

    Takeichi, Hiroshige / Koyama, Sachiko / Terao, Atsushi / Takeuchi, Fumiya / Toyosawa, Yuko / Murohashi, Harumitsu

    NeuroImage

    2010  Volume 49, Issue 3, Page(s) 2697–2706

    Abstract: ... technique for assessing speech comprehension using speech degraded by m-sequence modulation and found ... alternating-block factorial design was used with 23 Japanese-speaking participants, with time reversal and m ... In a recent electroencephalography (EEG) study (Takeichi et al., 2007a), we developed a new ...

    Abstract In a recent electroencephalography (EEG) study (Takeichi et al., 2007a), we developed a new technique for assessing speech comprehension using speech degraded by m-sequence modulation and found a correlation peak with a 400-ms delay. This peak depended on the comprehensibility of the modulated speech sounds. Here we report the results of a functional magnetic resonance imaging (fMRI) experiment comparable to our previous EEG experiment. We examined brain areas related to verbal comprehension of the modulated speech sound to examine which neural system processes this modulated speech. A non-integer, alternating-block factorial design was used with 23 Japanese-speaking participants, with time reversal and m-sequence modulation as factors. A main effect of time reversal was found in the left temporal cortex along the superior temporal sulcus (BA21 and BA39), left precentral gyrus (BA6) and right inferior temporal gyrus (BA21). A main effect of modulation was found in the left postcentral gyrus (BA43) and the right medial frontal gyri (BA6) as an increase by modulation and in the left temporal cortex (BA21, 39), parahippocampal gyrus (BA34), posterior cingulate (BA23), caudate and thalamus and right superior temporal gyrus (BA38) as a decrease by modulation. An interaction effect associated specifically with non-modulated speech was found in the left frontal gyrus (BA47), left occipital cortex in the cuneus (BA18), left precuneus (BA7, 31), right precuneus (BA31) and right thalamus (forward>reverse). The other interaction effect associated specifically with modulation of speech sound was found in the inferior frontal gyrus in the opercular area (BA44) (forward>reverse). Estimated scalp projection of the component correlation function (Cao et al., 2002) for the corresponding EEG data (Takeichi et al., 2007a, showed leftward dominance. Hence, activities in the superior temporal sulcus (BA21 and BA39), which are commonly observed for speech processing, as well as left precentral gyrus (BA6) and left inferior frontal gyrus in the opercular area (BA44) is suggested to contribute to the comprehension-related EEG signal.
    MeSH term(s) Adult ; Brain/physiology ; Brain Mapping ; Comprehension/physiology ; Female ; Functional Laterality/physiology ; Humans ; Image Interpretation, Computer-Assisted ; Magnetic Resonance Imaging ; Male ; Phonetics ; Speech Perception/physiology ; Young Adult
    Language English
    Publishing date 2010-02-01
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1147767-2
    ISSN 1095-9572 ; 1053-8119
    ISSN (online) 1095-9572
    ISSN 1053-8119
    DOI 10.1016/j.neuroimage.2009.10.063
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  3. Article ; Online: Successful cochlear implantation in a patient with mitochondrial hearing loss and m.625G>A transition.

    Sudo, A / Takeichi, N / Hosoki, K / Saitoh, S

    The Journal of laryngology and otology

    2011  Volume 125, Issue 12, Page(s) 1282–1285

    Abstract: Objective: We present a patient with mitochondrial hearing loss and a novel mitochondrial DNA transition, who underwent successful cochlear implantation.: Case report: An 11-year-old girl showed epilepsy and progressive hearing loss. Despite the use ... ...

    Abstract Objective: We present a patient with mitochondrial hearing loss and a novel mitochondrial DNA transition, who underwent successful cochlear implantation.
    Case report: An 11-year-old girl showed epilepsy and progressive hearing loss. Despite the use of hearing aids, she gradually lost her remaining hearing ability. Laboratory data revealed elevated lactate levels, indicating mitochondrial dysfunction. Magnetic resonance imaging showed diffuse, mild brain atrophy. Cochlear implantation was performed, and the patient's hearing ability was markedly improved. Whole mitochondrial DNA genome analysis revealed a novel heteroplasmic mitochondrial 625G>A transition in the transfer RNA gene for phenylalanine. This transition was not detected in blood DNA from the patient's mother and healthy controls. Mitochondrial respiratory chain activities in muscle were predominantly decreased in complex III.
    Conclusion: This case indicates that cochlear implantation can be a valuable therapeutic option for patients with mitochondrial syndromic hearing loss.
    MeSH term(s) Audiometry, Pure-Tone ; Brain/pathology ; Child ; Cochlear Implantation ; Electron Transport Complex III ; Epilepsy, Generalized/complications ; Female ; Genome, Mitochondrial/genetics ; Growth Disorders/complications ; Hearing Loss, Sensorineural/complications ; Hearing Loss, Sensorineural/genetics ; Hearing Loss, Sensorineural/surgery ; Humans ; Hypertrichosis/complications ; Lactates/metabolism ; Magnetic Resonance Imaging ; Mitochondria/genetics ; Mitochondrial Diseases/genetics ; Mitochondrial Diseases/physiopathology ; Mitochondrial Diseases/surgery ; Phenylalanine/genetics ; Point Mutation/genetics ; RNA, Transfer/genetics ; Treatment Outcome
    Chemical Substances Lactates ; Phenylalanine (47E5O17Y3R) ; RNA, Transfer (9014-25-9) ; Electron Transport Complex III (EC 1.10.2.2)
    Language English
    Publishing date 2011-12
    Publishing country England
    Document type Case Reports ; Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 218299-3
    ISSN 1748-5460 ; 0022-2151
    ISSN (online) 1748-5460
    ISSN 0022-2151
    DOI 10.1017/S0022215111002453
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  4. Article: Speech comprehension assessed by electroencephalography: a new method using m-sequence modulation.

    Takeichi, Hiroshige / Koyama, Sachiko / Matani, Ayumu / Cichocki, Andrzej

    Neuroscience research

    2007  Volume 57, Issue 2, Page(s) 314–318

    Abstract: ... by a binary m-sequence and played forward or backward. A circular cross-correlation function was computed ... between the EEG signals and the m-sequence and averaged across subjects. Independent component analysis ...

    Abstract Electroencephalograms (EEGs) were recorded from eight Japanese speakers while they listened to Japanese and Spanish sentences (approximately 51s each). The sentences were modulated in amplitude by a binary m-sequence and played forward or backward. A circular cross-correlation function was computed between the EEG signals and the m-sequence and averaged across subjects. Independent component analysis of the averaged function revealed a component source response which was obtained only for the comprehensible Japanese and not for the incomprehensible sentences. The present study has thus shown that a 1-min long EEG signal is sufficient for the assessment of speech comprehension.
    MeSH term(s) Acoustic Stimulation ; Adult ; Brain Mapping ; Comprehension/physiology ; Electroencephalography ; Female ; Humans ; Male ; Phonetics ; Speech ; Speech Acoustics
    Language English
    Publishing date 2007-02
    Publishing country Ireland
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 605842-5
    ISSN 1872-8111 ; 0168-0102 ; 0921-8696
    ISSN (online) 1872-8111
    ISSN 0168-0102 ; 0921-8696
    DOI 10.1016/j.neures.2006.10.008
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  5. Article ; Online: Complex Cell Type-Specific Transcriptional Regulation by the Promoter and an Intron of the Mouse P-Cadherin Gene: (P-cadherin/cell adhesion molecule/transcriptional regulation).

    Hatta, Masayuki / Takeichi, Masatoshi

    Development, growth & differentiation

    2023  Volume 36, Issue 5, Page(s) 509–519

    Abstract: Expression of cell-cell adhesion molecule cadherins is dynamically regulated during development. We describe the structure of the promoter of the mouse P-cadherin gene and its transcriptional activity. The P-cadherin promoter had a tandem of B2 ... ...

    Abstract Expression of cell-cell adhesion molecule cadherins is dynamically regulated during development. We describe the structure of the promoter of the mouse P-cadherin gene and its transcriptional activity. The P-cadherin promoter had a tandem of B2 repetitive elements showing structural similarities to the E-cadherin gene promoter. Transcriptional properties of the P-cadherin promoter were surveyed along about 10 kbp of the 5° flanking region by CAT assay in several cell lines expressing or not expressing P-cadherin mRNA. The P-cadherin promoter exhibited complex profiles of transcriptional activity. When the promoter was introduced into P-cadherin positive cell lines, its activity greatly varied with the cell lines. Moreover, this promoter was active even in some of P-cadherin negative cell lines. Analyses of 5° deletions of the promoter suggest that multiple elements are differentially used by different cell lines. We also detected enhancer-like elements in the 2nd intron, which can activate both the P-cadherin and thymidine kinase promoters. The activity of each enhancer varied with cell lines, being independent of endogenous P-cadherin expression. These results suggest that P-cadherin gene transcription is regulated by highly complex combinations of elements in the promoter and the 2nd intron studied here and other regions for the cell-type specific expression.
    Language English
    Publishing date 2023-06-06
    Publishing country Japan
    Document type Journal Article
    ZDB-ID 280433-5
    ISSN 1440-169X ; 0012-1592
    ISSN (online) 1440-169X
    ISSN 0012-1592
    DOI 10.1111/j.1440-169X.1994.00509.x
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  6. Article ; Online: CELL ASSOCIATION PATTERN IN AGGREGATES CONTROLLED BY MULTIPLE CELL-CELL ADHESION MECHANISMS.

    Atsumi, Tadao / Takeichi, Masatoshi

    Development, growth & differentiation

    2023  Volume 22, Issue 2, Page(s) 133–142

    Abstract: We have previously assumed the presence of two mechanisms for the aggregation of Chinese hamster V79 cells, the ... ...

    Abstract We have previously assumed the presence of two mechanisms for the aggregation of Chinese hamster V79 cells, the Ca
    Language English
    Publishing date 2023-06-06
    Publishing country Japan
    Document type Journal Article
    ZDB-ID 280433-5
    ISSN 1440-169X ; 0012-1592
    ISSN (online) 1440-169X
    ISSN 0012-1592
    DOI 10.1111/j.1440-169X.1980.00133.x
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  7. Article ; Online: Current understanding of the phenotypic spectrum of patients with NLRP1 variants.

    Takeichi, Takuya / Akiyama, Masashi

    The British journal of dermatology

    2023  Volume 188, Issue 2, Page(s) 160–167

    MeSH term(s) Humans ; Genetic Predisposition to Disease ; Adaptor Proteins, Signal Transducing/genetics ; Inflammasomes ; NLR Proteins/genetics
    Chemical Substances Adaptor Proteins, Signal Transducing ; Inflammasomes ; NLRP1 protein, human ; NLR Proteins
    Language English
    Publishing date 2023-02-09
    Publishing country England
    Document type Journal Article ; Comment
    ZDB-ID 80076-4
    ISSN 1365-2133 ; 0007-0963
    ISSN (online) 1365-2133
    ISSN 0007-0963
    DOI 10.1093/bjd/ljac036
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  8. Article ; Online: Interrupted mosaic speech revisited: Gain and loss in intelligibility by stretchinga).

    Ueda, Kazuo / Hashimoto, Masashi / Takeichi, Hiroshige / Wakamiya, Kohei

    The Journal of the Acoustical Society of America

    2024  Volume 155, Issue 3, Page(s) 1767–1779

    Abstract: ... interrupted speech stimuli showed remarkable intelligibility gains [Udea, Takeichi, and Wakamiya (2022). J ...

    Abstract Our previous investigation on the effect of stretching spectrotemporally degraded and temporally interrupted speech stimuli showed remarkable intelligibility gains [Udea, Takeichi, and Wakamiya (2022). J. Acoust. Soc. Am. 152(2), 970-980]. In this previous study, however, gap durations and temporal resolution were confounded. In the current investigation, we therefore observed the intelligibility of so-called mosaic speech while dissociating the effects of interruption and temporal resolution. The intelligibility of mosaic speech (20 frequency bands and 20 ms segment duration) declined from 95% to 78% and 33% by interrupting it with 20 and 80 ms gaps. Intelligibility improved, however, to 92% and 54% (14% and 21% gains for 20 and 80 ms gaps, respectively) by stretching mosaic segments to fill silent gaps (n = 21). By contrast, the intelligibility was impoverished to a minimum of 9% (7% loss) when stretching stimuli interrupted with 160 ms gaps. Explanations based on auditory grouping, modulation unmasking, or phonemic restoration may account for the intelligibility improvement by stretching, but not for the loss. The probability summation model accounted for "U"-shaped intelligibility curves and the gain and loss of intelligibility, suggesting that perceptual unit length and speech rate may affect the intelligibility of spectrotemporally degraded speech stimuli.
    MeSH term(s) Speech ; Cognition ; Probability ; Software
    Language English
    Publishing date 2024-03-05
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 219231-7
    ISSN 1520-8524 ; 0001-4966
    ISSN (online) 1520-8524
    ISSN 0001-4966
    DOI 10.1121/10.0025132
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  9. Article ; Online: Multiple functions of α-catenin beyond cell adhesion regulation.

    Takeichi, Masatoshi

    Current opinion in cell biology

    2018  Volume 54, Page(s) 24–29

    Abstract: α-Catenin is known to play a pivotal role in cell-cell adhesion as a cytoplasmic partner for the cadherin adhesion receptors that are essential for tissue organization. The action of cadherins to firmly connect cells together depends on α-catenin; ... ...

    Abstract α-Catenin is known to play a pivotal role in cell-cell adhesion as a cytoplasmic partner for the cadherin adhesion receptors that are essential for tissue organization. The action of cadherins to firmly connect cells together depends on α-catenin; without α-catenin, cells tend to disperse. Despite this established role of α-catenin in cell junction formation, evidence has accumulated that it also plays extra-junctional roles, regulating various cell behaviors such as cell motility and polarity. Moreover, α-catenin has also been detected in non-metazoan organisms that lack cadherins, suggesting that its ancient role may not be related to cell adhesion. This article provides an overview of recent findings of such cadherin-independent functions of α-catenin, and discusses how these functions can be performed.
    MeSH term(s) Actins/metabolism ; Animals ; Cell Adhesion ; Cell Movement ; Cell Polarity ; Evolution, Molecular ; Humans ; alpha Catenin/metabolism ; beta Catenin/metabolism
    Chemical Substances Actins ; alpha Catenin ; beta Catenin
    Language English
    Publishing date 2018-03-08
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Review
    ZDB-ID 1026381-0
    ISSN 1879-0410 ; 0955-0674
    ISSN (online) 1879-0410
    ISSN 0955-0674
    DOI 10.1016/j.ceb.2018.02.014
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  10. Article: M-spondin, a novel ECM protein highly homologous to vertebrate F-spondin, is localized at the muscle attachment sites in the Drosophila embryo.

    Umemiya, T / Takeichi, M / Nose, A

    Developmental biology

    1997  Volume 186, Issue 2, Page(s) 165–176

    Abstract: ... by the M-spondin (mspo) gene. M-spondin protein contains a thrombospondin type I repeat (TSR) previously ... in the embryonic body wall. Secreted M-spondin protein diffused and eventually became immobilized at the MAS in late ... mutants suffered no obvious developmental defects. We propose that M-spondin, although its function is ...

    Abstract The muscle attachment site (MAS) in Drosophila provides a unique and excellent model system to study the mechanism of cell-matrix adhesion in developing organisms. Here, we report on the isolation and characterization of a novel extracellular matrix (ECM) molecule localized at the MAS, encoded by the M-spondin (mspo) gene. M-spondin protein contains a thrombospondin type I repeat (TSR) previously found in a variety of ECM molecules. Furthermore, it shares two conserved domains with F-spondin, a vertebrate ECM molecule with TSRs. The presence of TSR(s) and the two homologous domains thus defines a novel gene family of ECM molecules. The mspo mRNA was expressed by a large subset of muscles in the embryonic body wall. Secreted M-spondin protein diffused and eventually became immobilized at the MAS in late embryos. When expressed in S2 cells, the protein was secreted and became concentrated in the matrix on the surface of the culture dish. Genetic analysis revealed that both deletion mutants and misexpression mutants suffered no obvious developmental defects. We propose that M-spondin, although its function is redundant, is a component of the ECM and mediates mechanical linkage between the muscles and apodemes.
    MeSH term(s) Amino Acid Sequence ; Animals ; Base Sequence ; Cells, Cultured ; DNA, Complementary/chemistry ; DNA, Complementary/isolation & purification ; Drosophila/embryology ; Drosophila Proteins ; Extracellular Matrix Proteins/analysis ; Extracellular Matrix Proteins/chemistry ; Extracellular Matrix Proteins/genetics ; Gene Expression ; Growth Substances ; Microscopy, Electron ; Molecular Sequence Data ; Muscles/chemistry ; Muscles/embryology ; Neural Cell Adhesion Molecules/chemistry ; Neural Cell Adhesion Molecules/genetics ; Peptides ; RNA, Messenger/metabolism ; Sequence Analysis ; Sequence Homology
    Chemical Substances DNA, Complementary ; Drosophila Proteins ; Extracellular Matrix Proteins ; Growth Substances ; M-spondin ; Neural Cell Adhesion Molecules ; Peptides ; RNA, Messenger ; mspo protein, Drosophila
    Language English
    Publishing date 1997-06-15
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1114-9
    ISSN 1095-564X ; 0012-1606
    ISSN (online) 1095-564X
    ISSN 0012-1606
    DOI 10.1006/dbio.1997.8591
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

To top