Lewis X trisaccharide - glycobiological key to unlocking cellular communication and disease intervention

Lewis X trisaccharide, as a crucial carbohydrate epitope, is known as the "identification code" on the cell surface. It is not only a key messenger in physiological processes such as embryonic development and cell adhesion, but also a high-profile star molecule in the fields of modern immunology, cancer research and stem cell biology.

Chemical Information

Chemical name: Galβ1-4(Fucα1-3)GlcNAc (β-D-galactosyl-(1→4)-[α-L-fucosyl-(1→3)]-2-acetylamino-2-deoxy-D-glucose)

Common name: Lewis X trisaccharide, CD15, SSEA-1

Chemical formula: C20H35NO15

Molecular weight: 529.49 g/mol

CAS number: 71208-06-5

Structural features

The structure of Lewis X trisaccharide is exquisite and unique. Its core mystery lies in:

Characteristic fucosylation: At position 3 of N-acetylglucosamine (GlcNAc), a fucose (Fuc) is connected by an α-1,3 glycosidic bond, which together with galactose (Gal) forms a typical "trisaccharide branch" structure.

Key recognition epitope: This unique spatial conformation enables it to be recognized with high specificity by specific lectins (such as selectins) and antibodies (such as anti-SSEA-1), as precise as a "lock and key", mediating important biorecognition processes.

Main applications and advantages

1. Markers for cancer research and diagnosis

Tumor marker: Lewis X antigen (usually detected as CD15 or SSEA-1) is abnormally highly expressed on the surface of various cancer cells (such as myeloid leukemia, lymphoma, and various solid tumors). It can be used as a powerful immunohistochemical marker for pathological diagnosis, classification and prognosis assessment of cancer.

Metastasis research: The Lewis X structure can bind to E-selectin on the surface of endothelial cells. This process is a key initial step for cancer cells to target organ invasion and metastasis. It is a core tool for studying the mechanism of cancer metastasis and developing inhibitory drugs.

2. Core player in immune regulation and inflammatory response

The “brake” and “throttle” of inflammation: The interaction between Lewis X and selectins on the surface of leukocytes is the core mechanism that guides leukocytes to roll, adhere, and ultimately migrate to the site of inflammation. Research on this pathway provides clear targets for the development of new anti-inflammatory drugs (such as selectin inhibitors).

Immune cell identification: As CD15 antigen, it is an important surface marker for the identification and isolation of myeloid immune cells such as neutrophils.

3. Key tools for stem cell and developmental biology research

Stem cell marker: Lewis

Fate regulation research: Lewis X trisaccharide is an ideal molecular tool to explore how glycosylation regulates stem cell differentiation, fate, and intercellular communication.

4. New targets for drug development and vaccine design

Targeted therapy: Based on its specific expression, antibody-drug conjugates (ADC) and CAR-T cell therapy targeting Lewis X are in the cutting-edge exploration stage, opening up new ways for precise cancer treatment.

Sugar vaccine development: Using Lewis X or its analogs as antigens can stimulate the body to produce specific immune responses, providing candidate molecules for the development of sugar vaccines against cancer or specific pathogens.

Conclusion

Lewis From the precise diagnosis of cancer to innovative treatments for inflammatory diseases, from the mysterious world of stem cells to the development of next-generation biopharmaceuticals, their value is being rapidly explored.