Molecular analysis of apoptosis pathway after photodynamic therapy in breast cancer: Animal model study.
Photodiagnosis Photodyn Ther 2016;
14:152-8. [PMID:
27018246 DOI:
10.1016/j.pdpdt.2016.03.006]
[Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2016] [Revised: 03/06/2016] [Accepted: 03/21/2016] [Indexed: 02/07/2023]
Abstract
BACKGROUND
Molecular investigation of breast tumors has permitted better understanding about interaction of genes and pathways involved in tumor progression.
OBJECTIVE
The aim of this study was to evaluate the association between genes belonging to the pathway of apoptosis with tumor response to photodynamic therapy.
STUDY DESIGN/MATERIALS AND METHODS
The mammary tumors were induced in twenty-four Spraguey-Dawley female rats by oral gavage of 7,12-dimethylbenz(a)anthracene (8mg/Kg body weight). Animals were divided into three groups: G1 (normal tissue), G2 (tumors without treatment), G3 (animals euthanized 48h after treatment). The photosensitizer used was a chlorin, 5,15-bis-(2-bromo-5-hydroxyphenyl) chlorin in the dose of 8mg/kg for each animal. Light source of diode laser at a wavelength of 660nm, fluence rate of 100mW/cm, and light dose of 100J/cm was delivery to lesions for treatment. A sample from each animal was investigated by quantitative real time PCR using Rat Apoptosis RT(2) Profiler™ PCR Array platform.
RESULTS
Pro-apoptotic BAK1, CARD6, CASP8, CIDEA, CIDEB, DAPK1, TNF, TNFRSF10B, FASLG, LOC687813, and TP73 genes showed increased expression, and CD40 anti-apoptotic gene showed decreased expression in the group who underwent PDT (G3) in relation to G2.
CONCLUSION
The results indicated that these genes are involved more directly with cellular apoptosis induced by PDT using the Chlorin photosensitizer.
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