GLORIA

GEOMAR Library Ocean Research Information Access

X

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Online Resource
    Online Resource
    CD44 expression and regulation during mammary gland development and function
    The Company of Biologists ; 2000
    In:  Journal of Cell Science Vol. 113, No. 14 ( 2000-07-15), p. 2619-2630
    Details
    In: Journal of Cell Science, The Company of Biologists, Vol. 113, No. 14 ( 2000-07-15), p. 2619-2630
    Abstract: The CD44v6 epitope has been widely reported to be expressed in human mammary carcinomas, yet its prognostic significance is controversial and its function in mammary tumors and mammary glands is unknown. To begin to resolve these issues, we analysed in detail the normal postnatal expression patterns and regulation of the CD44v6 epitope in murine mammary glands. We demonstrate that significant CD44v6 epitope expression is first seen during puberty, and that after puberty CD44v6 epitope expression follows the estrous cycle. CD44v6 epitope expression is observed in the myoepithelium and also less widely in luminal epithelial cells. During lactation, CD44v6 epitope expression is turned off and reappears during involution. The CD44 variant isoform bearing the v6 epitope is CD44v1-v10. Using HC11, a mammary epithelial cell line with stem cell characteristics, and facilitated by the cloning of the murine CD44 promoter, we show that growth factors and hormones which regulate ductal growth and differentiation modulate CD44 transcription. Together our data suggest that the CD44v6 epitope is expressed in mammary epithelial stems cells and in lineages derived from these cells, and that CD44v6 expression is regulated in part by hormones and growth factors such as IGF-1 and EGF which regulate the growth and differentiation of the mammary epithelium. The function of these same growth factors and hormones is often perturbed in mammary carcinomas, and we suggest that CD44v6 expression in tumors reflects this perturbation. We conclude that the expression of the CD44v6 epitope observed in some mammary tumors reflects the stem cell origin of breast tumors, and that whether or not the CD44v6 epitope is expressed in a mammary tumor is determined by the differentiation status of the tumor cells.
    Type of Medium: Online Resource
    ISSN: 0021-9533 , 1477-9137
    URL: Article
    DOI: 10.1242/jcs.113.14.2619
    Language: English
    Publisher: The Company of Biologists
    Publication Date: 2000
    detail.hit.zdb_id: 219171-4
    detail.hit.zdb_id: 1483099-1
    SSG: 12
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 2
    Online Resource
    Online Resource
    CD44 is the major peanut lectin-binding glycoprotein of human epidermal keratinocytes and plays a role in intercellular adhesion
    The Company of Biologists ; 1995
    In:  Journal of Cell Science Vol. 108, No. 5 ( 1995-05-01), p. 1959-1970
    Details
    In: Journal of Cell Science, The Company of Biologists, Vol. 108, No. 5 ( 1995-05-01), p. 1959-1970
    Abstract: Although binding of peanut agglutinin (PNA) to keratinocytes is often used as a marker of terminal differentiation, the identity of the PNA-binding glycoproteins has been unclear. We now show that an antiserum raised against the glycoproteins recognises isoforms of CD44, the most abundant of which could be labelled with [35S]sulphate, indicating the presence of glycosaminoglycan side chains. RT-PCR analysis showed that keratinocytes expressed at least 5 forms of CD44 containing different numbers of exons from the variable region of the extracellular domain and also expressed the standard ‘haemopoietic’ form of CD44 which lacks the variable exons. Standard and variant isoforms of CD44 were expressed both by proliferating keratinocytes and cells undergoing terminal differentiation, although the level of CD44 mRNAs decreased when keratinocytes were placed in suspension to induce differentiation. The role of CD44 in intercellular adhesion was investigated by plating keratinocytes onto a rat pancreatic carcinoma line transfected with different CD44 isoforms. Keratinocyte adhesion to transfectants expressing variant exons 4-7 was greater than to cells expressing standard CD44 and could be inhibited with hyaluronan or digestion with hyaluronidase. These observations confirm earlier predictions that the PNA-binding glycoproteins of keratinocytes play a role in intercellular adhesion.
    Type of Medium: Online Resource
    ISSN: 0021-9533 , 1477-9137
    URL: Article
    DOI: 10.1242/jcs.108.5.1959
    Language: English
    Publisher: The Company of Biologists
    Publication Date: 1995
    detail.hit.zdb_id: 219171-4
    detail.hit.zdb_id: 1483099-1
    SSG: 12
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 3
    Online Resource
    Online Resource
    Identification of IHABP, a 95 kDa intracellular hyaluronate binding protein
    The Company of Biologists ; 1998
    In:  Journal of Cell Science Vol. 111, No. 12 ( 1998-06-15), p. 1673-1684
    Details
    In: Journal of Cell Science, The Company of Biologists, Vol. 111, No. 12 ( 1998-06-15), p. 1673-1684
    Abstract: The extracellular matrix component hyaluronan is believed to play important roles in various processes of organogenesis, cell migration and cancer. Recognition of and binding to hyaluronan is mediated by cell surface receptors. Three of them, CD44, ICAM-1 and RHAMM (receptor for hyaluronic acid mediated motility), have been identified. A cDNA clone designated RHAMM turned out to possess transforming capacity. Based on this published sequence, we isolated the complete cDNA of the murine gene. The cDNA comprises an open reading frame of 2.3 kb and encodes a 95 kDa protein. The protein carries a hyaluronan binding motif which binds to hyaluronan in vitro but not to heparin or chondroitin sulphate. It is ubiquitously expressed in normal cells and in all tumour cell lines irrespective of their metastatic properties. One tumour cell line, the metastatic Lewis lung carcinoma, expresses a larger 105 kDa variant form of the protein due to a genomic rearrangement. Antibodies raised against the 95 kDa protein were used for subcellular localization studies. The hyaluronan binding protein is not detectable at the cell surface but is rather localized exclusively intracellularly. Clearly, the sequence we have identified encodes a protein with properties substantially different to the RHAMM protein. We tentatively name the protein intracellular hyaluronic acid binding protein, IHABP.
    Type of Medium: Online Resource
    ISSN: 0021-9533 , 1477-9137
    URL: Article
    DOI: 10.1242/jcs.111.12.1673
    Language: English
    Publisher: The Company of Biologists
    Publication Date: 1998
    detail.hit.zdb_id: 219171-4
    detail.hit.zdb_id: 1483099-1
    SSG: 12
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 4
    Online Resource
    Online Resource
    CD44-dependent lymphoma cell dissemination: a cell surface CD44 variant, rather than standard CD44, supports in vitro lymphoma cell rolling on hyaluronic acid substrate and its in vivo accumulation in the peripheral lymph nodes
    The Company of Biologists ; 2001
    In:  Journal of Cell Science Vol. 114, No. 19 ( 2001-10-01), p. 3463-3477
    Details
    In: Journal of Cell Science, The Company of Biologists, Vol. 114, No. 19 ( 2001-10-01), p. 3463-3477
    Abstract: Cell motility is an essential element of tumor dissemination, allowing organ infiltration by cancer cells. Using mouse LB lymphoma cells transfected with standard CD44 (CD44s) cDNA (LB-TRs cells) or with the alternatively spliced CD44 variant CD44v4-v10 (CD44v) cDNA (LB-TRv cells), we explored their CD44-dependent cell migration. LB-TRv cells, but not LB-TRs or parental LB cells, bound soluble hyaluronic acid (HA) and other glycosaminoglycans (GAGs), and exclusively formed, under physiological shear force, rolling attachments on HA substrate. Furthermore, LB-TRv cells, but not LB-TRs cells or their parental LB cells, displayed accelerated local tumor formation and enhanced accumulation in the peripheral lymph nodes after s.c. inoculation. The aggressive metastatic behavior of i.v.-injected LB-TRV cells, when compared with that of other LB-transfectants, is attributed to more efficient migration to the lymph nodes, rather than to local growth in the lymph node. Injection of anti-CD44 monoclonal antibody or of the enzyme hyaluronidase also prevented tumor growth in lymph nodes of BALB/c mice inoculated with LB-TRv cells. The enhanced in vitro rolling and enhanced in vivo local tumor growth and lymph node invasion disappeared in LB cells transfected with CD44v cDNA bearing a point mutation at the HA binding site, located at the distal end of the molecule constant region. These findings show that the interaction of cell surface CD44v with HA promotes cell migration both in vitro and in vivo, and they contribute to our understanding of the mechanism of cell trafficking, including tumor spread.
    Type of Medium: Online Resource
    ISSN: 1477-9137 , 0021-9533
    URL: Article
    DOI: 10.1242/jcs.114.19.3463
    Language: English
    Publisher: The Company of Biologists
    Publication Date: 2001
    detail.hit.zdb_id: 219171-4
    detail.hit.zdb_id: 1483099-1
    SSG: 12
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 5
    Online Resource
    Online Resource
    Hyaluronan-oligosaccharide-induced transcription of metalloproteases
    The Company of Biologists ; 2004
    In:  Journal of Cell Science Vol. 117, No. 2 ( 2004-01-15), p. 359-367
    Details
    In: Journal of Cell Science, The Company of Biologists, Vol. 117, No. 2 ( 2004-01-15), p. 359-367
    Abstract: Activated dendritic epidermal Langerhans cells and metastatic tumour cells share many properties. Both cell types can invade the surrounding tissue, enter the lymphatic system and travel to regional lymph nodes. We have recently shown that fragments of the extracellular matrix component hyaluronan, which are typically produced at sites of inflammation, can activate dendritic cells. Upon activation, dendritic cells upregulate expression of matrix metalloproteases (MMPs). These observations prompted us to investigate whether exposure to hyaluronan fragments also induces MMP expression in tumour cells. Here, we report that MMP-9, MMP-13 and urokinase plasminogen activator are upregulated in murine 3LL tumour cells after exposure to mixed-size hyaluronan. Similarly upregulated MMP-9 and MMP-13 expression was observed in primary fibroblasts. By using size-fractionated hyaluronan preparations, we show that the enhanced expression of MMP-9 and MMP-13 is only induced by small hyaluronan (HA) fragments. Although our data suggest that HA-fragment-induced MMP-9 and MMP-13 expression is receptor mediated, they rule out an involvement of the hyaluronan receptors CD44, RHAMM/IHAP and TLR-4. Finally, we show that HA fragment-induced MMP-9 transcription is mediated via NF-κB. Our results suggest that the metastasis-associated HA degradation in tumours might promote invasion by inducing MMP expression.
    Type of Medium: Online Resource
    ISSN: 1477-9137 , 0021-9533
    URL: Article
    DOI: 10.1242/jcs.00831
    Language: English
    Publisher: The Company of Biologists
    Publication Date: 2004
    detail.hit.zdb_id: 219171-4
    detail.hit.zdb_id: 1483099-1
    SSG: 12
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...