Direct Involvement of Intracellular Ca Transport ATPase in the Development of Thapsigargin Resistance by Chinese Hamster Lung Fibroblasts (*)

Thapsigargin (TG), a specific inhibitor of intracellular Ca transport ATPases (SERCA), inhibits cell proliferation when added to culture media in the nanomolar concentration range. However, long term exposure to gradually increasing concentrations of TG induces resistance to TG inhibition in both the parental Chinese hamster lung fibroblast DC-3F and a subline derived from it via transfection and stable expression of a full-length cDNA encoding avian SERCA1 ATPase (DC-3F/Ca cells). TG resistance develops in parallel with selection of cells expressing higher levels of the endogenous SERCA2 as well as of the exogenous transfected SERCA1 ATPase, whose Ca transport function can be studied in situ by imaging techniques and following isolation in microsomal fractions. Microsomes isolated from resistant cells contain two functionally distinct populations of ATPases: a population that is inhibited by stoichiometric titration with TG, and a population displaying resistance to inhibition even when TG exceeds the enzyme stoichiometry. It is apparent that resistance to TG develops in parallel with (a) selection of cells expressing high levels of SERCA ATPases, and (b) selection of an ATPase that is resistant to TG.

• Publication year

  1995

• Venue

  Journal of Biological Chemistry

• Publication date

  1995-05-19

• Fields of study

  Biology, Medicine

• Identifiers
  DOI 10.1074/JBC.270.20.12140PMID 7744863
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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