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Area of Science:

  • Biochemistry
  • Pharmacology
  • Oncology

Background:

  • Thapsia garganica contains a skin-irritating compound, thapsigargin.
  • Thapsigargin inhibits the sarco/endoplasmic reticulum Ca(2+) ATPase (SERCA), inducing apoptosis.
  • Targeted drug delivery can enhance cancer treatment efficacy.

Purpose of the Study:

  • To isolate and elucidate the structure of the skin-irritating principle from Thapsia garganica.
  • To develop novel prodrugs by conjugating thapsigargin to peptides targeting cancer-specific antigens.
  • To evaluate the therapeutic potential of these prodrugs in prostate cancer treatment.

Main Methods:

  • Isolation and structural elucidation of thapsigargin.
  • Chemical conjugation of thapsigargin to PSA- and PSMA-specific peptides.
  • In vitro and in vivo evaluation of prodrug cytotoxicity and selectivity.

Main Results:

  • Thapsigargin was isolated and its structure determined.
  • Prodrugs selectively targeting prostate specific antigen (PSA) or prostate specific membrane antigen (PSMA) were successfully synthesized.
  • One prodrug, mipsagargin, is currently undergoing Phase II clinical trials.

Conclusions:

  • Thapsigargin is a potent apoptosis-inducing agent.
  • Thapsigargin-based prodrugs offer a targeted approach for prostate cancer therapy.
  • Mipsagargin demonstrates promising clinical efficacy and safety in ongoing trials.