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Related Experiment Videos

Complement-mediated killing of microtumors in vitro

J Hakulinen1, S Meri

  • 1Department of Bacteriology and Immunology, Haartman Institute, University of Helsinki, Finland.

The American Journal of Pathology
|September 15, 1998
PubMed
Summary

Targeting complement lysis inhibitor protectin (CD59) with antibodies effectively destroys cancer cells in 3D tumor models. This approach shows promise for treating micrometastases and small solid tumors by inducing significant cell death and tumor volume reduction.

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Area of Science:

  • Immunology
  • Cancer Biology
  • Biochemistry

Background:

  • Complement-mediated lysis of cancer cells differs between suspension and 3D aggregates.
  • Multicellular tumor spheroids model micrometastases and small solid tumors.

Purpose of the Study:

  • To investigate complement-mediated destruction of cancer cells in 3D tumor models.
  • To evaluate the efficacy of targeting protectin (CD59) in these models.

Main Methods:

  • Utilized breast carcinoma (T47D) and ovarian teratocarcinoma (PA-1) cell lines to create multicellular tumor spheroids.
  • Treated spheroids with an antitumor antibody and a monoclonal antibody (YTH53.1) against protectin (CD59).
  • Assessed complement component infiltration (C1q, C3, C5b-9) and cell killing using 51Cr release and propidium iodide staining.

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Main Results:

  • A 1-2 hour lag phase preceded significant microtumor killing after antibody and CD59 inhibitor treatment.
  • Overnight incubation showed YTH53.1 and C1q infiltration, with C3 and C5b-9 at the periphery.
  • 24-hour complement treatment killed 33% of spheroid cells and reduced tumor volume by 28%.
  • Propidium iodide staining indicated outer layer cell death and peeling.

Conclusions:

  • Targeting protectin (CD59) in conjunction with complement can effectively lyse cancer cells within 3D tumor structures.
  • This strategy demonstrates potential for treating micrometastases and small solid tumors by disrupting their integrity.