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Cancer-associated glycosphingolipid antigens: their structure, organization, and function
1Pacific Northwest Research Institute and Department of Pathobiology University of Washington, Seattle, WA 98122, USA.
Abstract:
Experimental and human cancers are often characterized by the presence of tumor-associated glycosphingolipid (GSL) antigens defined by monoclonal antibodies. Major progress has been made during the past two decades on structural identification of these antigens. None of these structures are truly 'tumor-specific'. However, many of the antibodies show preferential or 'specific' reactivity with tumors, based on organizational differences of membrane GSLs in tumor cells versus normal cells. Clustered GSL antigens organized with transducer molecules in microdomain have been found recently to comprise a structural and functional unit involved in tumor cell adhesion coupled with signal transduction. Some of the GSL antigens have been identified as adhesion molecules recognized by carbohydrate-binding proteins or by complementary carbohydrates on target cells. Such adhesion, coupled with signaling, may initiate the metastatic process. Elucidating the mechanism of this initial adhesion/signaling step may lead to discovery of therapeutic agents that disrupt adhesion ('antiadhesion therapy') or normalize signaling ('ortho-signaling therapy'). Tumor-associated GSL antigens are also a target in immunotherapy of tumors, including development of antitumor vaccines.
Insights
Tumor-associated glycosphingolipid (GSL) antigens are key targets for cancer immunotherapy. Understanding their role in cell adhesion and signaling may lead to novel antiadhesion and ortho-signaling therapies.
Area of Science:
- Biochemistry
- Immunology
- Oncology
Background:
- Tumor-associated glycosphingolipid (GSL) antigens are prevalent in experimental and human cancers.
- Monoclonal antibodies have identified numerous GSL antigen structures, though none are strictly tumor-specific.
- Antibody reactivity with tumors often stems from altered GSL organization in cancer cell membranes.
Purpose of the Study:
- To explore the structural and functional roles of tumor-associated GSL antigens.
- To investigate the involvement of GSLs in tumor cell adhesion and signal transduction.
- To identify potential therapeutic targets for cancer treatment.
Main Methods:
- Structural identification of GSL antigens using monoclonal antibodies.
- Analysis of membrane GSL organization in tumor versus normal cells.
- Investigation of GSLs as adhesion molecules and their interaction with carbohydrate-binding proteins.
Main Results:
- Clustered GSL antigens, organized within microdomains with transducer molecules, are implicated in tumor cell adhesion and signal transduction.
- Certain GSL antigens function as adhesion molecules, interacting with complementary carbohydrates or proteins on target cells.
- This adhesion and signaling mechanism is potentially involved in initiating cancer metastasis.
Conclusions:
- Elucidating the adhesion/signaling mechanism of GSL antigens can lead to new therapeutic strategies like antiadhesion or ortho-signaling therapy.
- Tumor-associated GSL antigens represent promising targets for cancer immunotherapy, including vaccine development.