Secretory cell immunoscreening assay--a highly sensitive screening method for secretory cells

Area of Science:

• Biotechnology
• Cell Biology
• Immunology

Background:

• Detecting and selecting transformed cells that secrete specific proteins is essential for biotechnology and biopharmaceutical research.
• Existing methods for screening high-protein-secreting cell clones can be time-consuming and lack sensitivity.

Purpose of the Study:

• To develop a rapid, sensitive, and efficient method for screening transformed secretory cells.
• To validate the secretory cell immunoscreening assay (SCISA) for identifying high-producing clones secreting human interleukin-6 (hIL-6).

Main Methods:

• Developed the secretory cell immunoscreening assay (SCISA) using solid-phase antibodies adsorbed onto a nitrocellulose membrane.
• Applied the SCISA method to screen recombinant BHK-21 cells secreting human interleukin-6 (hIL-6).
• Utilized an enhanced chemiluminescence detection system for sensitive protein detection.

Main Results:

• The SCISA method demonstrated high sensitivity, detecting less than 100 pg of hIL-6 secreted by a single cell colony.
• Successfully screened recombinant BHK-21 cells to identify highly productive clones secreting hIL-6.
• The assay allows for rapid and easy selection of high-producing colonies from large cell populations.

Conclusions:

• The secretory cell immunoscreening assay (SCISA) is a rapid and sensitive tool for detecting secreted products from transformed cells.
• SCISA facilitates efficient identification and selection of high-producing cell clones, accelerating biopharmaceutical development.
• This method offers a significant advancement in screening methodologies for cell-based protein production.