RNA aptamers targeting cancer stem cell marker CD133

Area of Science:

• Biochemistry
• Molecular Biology
• Cancer Research

Background:

• The AC133 epitope of CD133 is a widely used cell surface marker for cancer stem cells.
• Monoclonal antibodies targeting AC133 are common but may have limitations in therapeutic applications.

Purpose of the Study:

• To isolate and characterize novel RNA aptamers that specifically recognize the AC133 epitope of CD133.
• To compare the efficacy of these RNA aptamers with the AC133 antibody in terms of sensitivity, tumor penetration, and retention.

Main Methods:

• Isolation and characterization of RNA aptamers.
• Assessment of aptamer specificity and sensitivity for the AC133 epitope and CD133 protein.
• Evaluation of aptamer and antibody performance in a 3-D tumor sphere model.

Main Results:

• Two novel RNA aptamers were successfully isolated, including a 15-nucleotide aptamer, the smallest described.
• Both aptamers demonstrated high sensitivity and specific recognition of the AC133 epitope and CD133 protein.
• The aptamers exhibited superior tumor penetration and retention compared to the AC133 antibody in a 3-D tumor sphere model.

Conclusions:

• Novel RNA aptamers targeting CD133 offer a promising alternative to antibodies for cancer stem cell applications.
• These aptamers possess high sensitivity and enhanced tumor penetration, suitable for targeted therapeutics and molecular imaging.
• The development of these aptamers represents a significant advancement in targeting cancer stem cells for improved diagnostics and treatments.