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[Reversal of multidrug resistance by cyproheptadine in KBV200 cells]

Z H Miao1, X T Li, Y J Zhu

  • 1Cancer Research Institute, Chinese Academy of Medical Sciences.

Yao Xue Xue Bao = Acta Pharmaceutica Sinica
|May 1, 1997
PubMed

Insights

Cyproheptadine (CYP) effectively reverses multidrug resistance (MDR) in cancer cells by inhibiting P-glycoprotein (PGP) function. This study demonstrates CYP

Area of Science:

  • Pharmacology
  • Cancer Biology
  • Drug Resistance

Background:

  • Multidrug resistance (MDR) significantly limits cancer chemotherapy efficacy.
  • P-glycoprotein (PGP) is a key efflux pump contributing to MDR.
  • Identifying novel MDR reversal agents is crucial for improving treatment outcomes.

Purpose of the Study:

  • To investigate the potential of cyproheptadine (CYP) as a multidrug resistance (MDR) reversing agent.
  • To elucidate the mechanism by which CYP affects MDR in the KBV200 cell line.

Main Methods:

  • MTT assay was used to evaluate the reversal of drug resistance by CYP.
  • Drug accumulation and efflux studies were performed using adriamycin (ADR) and rhodamine 123 (R123).
  • Immunocytochemical assays and slot blot analysis assessed PGP expression and mdr1 RNA levels.

Main Results:

  • CYP reversed resistance to vincristine, adriamycin (ADR), and etoposide in KBV200 cells.
  • CYP enhanced ADR and R123 accumulation within cells and reduced their efflux.
  • CYP did not alter PGP protein levels or mdr1 RNA expression, suggesting functional inhibition.

Conclusions:

  • Cyproheptadine (CYP) acts as a potent multidrug resistance (MDR) reversing agent.
  • CYP's mechanism involves the inhibition of P-glycoprotein (PGP) pumping activity, not altered expression.
  • CYP shows promise as an adjuvant therapy to overcome MDR in cancer treatment.

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