A recombinant immunotoxin that is active on prostate cancer cells and that is composed of the Fv region of monoclonal antibody PR1 and a truncated form of Pseudomonas exotoxin

Proc Natl Acad Sci U S A. 1993 Jan 15;90(2):547-51. doi: 10.1073/pnas.90.2.547.

Abstract

Monoclonal antibody PR1 binds to the surface of normal prostate cells and to adenocarcinomas of the prostate. The cDNAs coding for the heavy and light chain variable regions of monoclonal antibody PR1 were cloned by PCR techniques. A recombinant toxin was then constructed that has the heavy chain variable region of monoclonal antibody PR1 connected to the light chain variable region by a flexible peptide linker to create a single-chain Fv; the Fv in turn is fused to a truncated form of Pseudomonas exotoxin. The resulting recombinant immunotoxin PR1(Fv)-PE38KDEL was produced in Escherichia coli and accumulated in inclusion bodies. After denaturation and renaturation, active monomeric molecules with a molecular mass of approximately 65 kDa were purified to homogeneity. PR1(Fv)-PE38KDEL binds specifically to cells containing the PR1 antigen and is very cytotoxic toward a subset of LNCaP cells that express the PR1 antigen on their surface.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • ADP Ribose Transferases*
  • Amino Acid Sequence
  • Antibodies, Monoclonal / genetics
  • Antibodies, Monoclonal / pharmacology
  • Antibody Specificity
  • Bacterial Toxins / genetics
  • Bacterial Toxins / pharmacology*
  • Base Sequence
  • Carcinoma / therapy*
  • Dose-Response Relationship, Drug
  • Exotoxins / genetics
  • Exotoxins / pharmacology*
  • Humans
  • Immunoglobulin Heavy Chains / genetics
  • Immunoglobulin Light Chains / genetics
  • Immunoglobulin Variable Region / genetics
  • Immunotoxins / biosynthesis
  • Immunotoxins / genetics
  • Immunotoxins / pharmacology*
  • Immunotoxins / toxicity
  • Male
  • Molecular Sequence Data
  • Plasmids / genetics
  • Prostatic Neoplasms / therapy*
  • Pseudomonas aeruginosa Exotoxin A
  • Recombinant Proteins / pharmacology
  • Recombinant Proteins / therapeutic use
  • Tumor Cells, Cultured
  • Virulence Factors*

Substances

  • Antibodies, Monoclonal
  • Bacterial Toxins
  • Exotoxins
  • Immunoglobulin Heavy Chains
  • Immunoglobulin Light Chains
  • Immunoglobulin Variable Region
  • Immunotoxins
  • Recombinant Proteins
  • Virulence Factors
  • ADP Ribose Transferases