title: In vitro analysis of the relationships between metallothionein expression and cisplatin sensitivity of non-small cellular lung cancer cells.
abstract: BACKGROUND
  Cisplatin-based therapy is a pivotal type of chemotherapy for non-small cell lung cancer (NSCLC) and chemoresistance to cisplatin represents one of the most significant barriers to improving long-term clinical outcomes.
  
  
  METHODS
  The present study aimed at examining metallothionein (MT) expression in six NSCLC cell lines as well as examining effects of exposure to cisplatin on MT expression in the most cisplatin-resistant (97/97) and the cisplatin-sensitive (DV90) cell lines.
  
  
  RESULTS
  The most cisplatin-resistant NSCLC cell line [97/97; (IC50)=4.659 μM] exposed to the highest concentration of cisplatin (10 μM) exhibited decreased nuclear MT expression (MTn=6) compared to cells cultured in medium with a lower concentration of cisplatin (0, 1 and 5 μM) (MTn=12). A higher cytoplasmic metallothionein expression (MTc=6) was found in the 97/97 cell line exposed to the highest concentration of cisplatin (10 μM), compared to cells cultured in the medium with lower concentrations of cisplatin (0, 1 and 5 μM) (MTc=3). The most cisplatin-sensitive NSCLC cell line (DV90; IC50=0.184 μM) was characterized by a significant decrease of both nuclear and cytoplasmic MT expression with increasing cisplatin concentrations (5 vs. 10 μM).
  
  
  CONCLUSIONS
  Nuclear and cytoplasmic expression of MT has no significant impact on the development of cisplatichemoresistance in NSCLC cell lines. The present study suggests that cisplatin resistance in NSCLC is metallothionein-independent.
authors: Department of Pathomorphology and Oncological Cytology, Wroclaw Medical University, Borowska 213, 50-556 Wroclaw, Poland. piotrdonizy@wp.pl.
authors: Tserenchunt
authors: T
authors: Gansukh
authors: Piotr
authors: P
authors: Donizy
authors: Agnieszka
authors: A
authors: Halon
authors: Hermann
authors: H
authors: Lage
authors: Pawel
authors: P
authors: Surowiak
mesh_terms: D000970:Antineoplastic Agents / Q000494:pharmacology*; D002289:Carcinoma, Non-Small-Cell Lung / Q000378:metabolism* / Q000473:pathology; D002945:Cisplatin / Q000494:pharmacology*; D006801:Humans; D066298:In Vitro Techniques; D008175:Lung Neoplasms / Q000378:metabolism* / Q000473:pathology; D008668:Metallothionein / Q000378:metabolism*
chemical_list: D000970:Antineoplastic Agents; D008668:Metallothionein; D002945:Cisplatin
keywords: DV90 cells; Non-small cell lung cancer; cisplatin resistance 97/97; immunocytochemistry; metallothionein