Title |
Molecular markers of DNA damage and repair in cervical cancer patients treated with cisplatin neoadjuvant chemotherapy: an exploratory study
|
---|---|
Published in |
Cell Stress and Chaperones, June 2017
|
DOI | 10.1007/s12192-017-0811-z |
Pubmed ID | |
Authors |
Nilda E. Real, Gisela N. Castro, F. Darío Cuello-Carrión, Claudia Perinetti, Hanna Röhrich, Niubys Cayado-Gutiérrez, Martin E. Guerrero-Gimenez, Daniel R. Ciocca |
Abstract |
Neoadjuvant (or induction) chemotherapy can be used for cervical cancer patients with locally advanced disease; this treatment is followed by radical surgery and/or radiation therapy. Cisplatin is considered to be the most active platinum agent drug for this cancer, with a response rate of 20%. In order to understand how the cisplatin treatment affects the stress response, in this work, we performed an exploratory study to analyze a number of stress proteins before and after cisplatin neoadjuvant chemotherapy. The study involved 14 patients; the pre- and post-chemotherapy paired biopsies were examined by hematoxylin and eosin staining and by immunohistochemistry. The proteins evaluated were p53, P16/INK4A, MSH2, nuclear protein transcriptional regulator 1 (NUPR1), and HSPB1 (total: HSPB1/t and phosphorylated: HSPB1/p). These proteins were selected because there is previous evidence of their relationship with drug resistance. The formation of platinum-DNA adducts was also studied. There was a great variation in the expression levels of the mentioned proteins in the pre-chemotherapy biopsies. After chemotherapy, p53 was not significantly affected by cisplatin, as well as P16/INK4A and MSH2 while nuclear NUPR1 content tended to decrease (p = 0.056). Cytoplasmic HSPB1/t expression levels decreased significantly following cisplatin therapy while nuclear HSPB1/t and HSPB1/p tended to increase. Since the most significant changes following chemotherapy appeared in the HSPB1 expression levels, the changes were confirmed by Western blot. The platinum-DNA adducts were observed in HeLa cell in apoptosis; however, in the tumor samples, the platinum-DNA adducts were observed in morphologically healthy tumor cells; these cells displayed nuclear HSPB1/p. Further mechanistic studies should be performed to reveal how HSPB1/p is related with drug resistance. When the correlations of the markers with the response to neoadjuvant chemotherapy were examined, only high pre-chemotherapy levels of cytoplasmic HSPB1/p correlated with a poor clinical and pathological response to neoadjuvant cisplatin chemotherapy (p = 0.056) suggesting that this marker could be useful opening its study in a larger number of cases. |
Mendeley readers
Geographical breakdown
Country | Count | As % |
---|---|---|
Unknown | 36 | 100% |
Demographic breakdown
Readers by professional status | Count | As % |
---|---|---|
Student > Bachelor | 10 | 28% |
Student > Master | 4 | 11% |
Researcher | 4 | 11% |
Student > Doctoral Student | 3 | 8% |
Student > Ph. D. Student | 3 | 8% |
Other | 3 | 8% |
Unknown | 9 | 25% |
Readers by discipline | Count | As % |
---|---|---|
Medicine and Dentistry | 8 | 22% |
Biochemistry, Genetics and Molecular Biology | 8 | 22% |
Agricultural and Biological Sciences | 3 | 8% |
Psychology | 2 | 6% |
Business, Management and Accounting | 1 | 3% |
Other | 5 | 14% |
Unknown | 9 | 25% |