Expression dynamics of CXCL12 and CXCR4 during the progression of mycosis fungoides.
BACKGROUND
Mycosis fungoides (MF) classically presents from patch stage to plaque stage over a number of years and finally progresses to tumour stage with nodal or visceral involvement. The mechanism of progression remains incompletely elucidated. Chemokines and their receptors are known to be involved in disease mechanisms, with CXCL12 and CXCR4 playing a critical role in carcinogenesis, invasion and cancer cell migration in various carcinomas.


OBJECTIVE
To investigate the expression of CXCL12 and CXCR4 in different cutaneous stages of MF.


METHODS
Formalin-fixed, paraffin-embedded skin samples from 40 patients with MF (21 patch stage, 10 plaque stage, nine tumour stage) and 30 non-neoplastic control skin samples were analysed. CXCL12 and CXCR4 were assessed by quantitative reverse-transcription polymerase chain reaction and immunohistochemical staining.


RESULTS
The expression level of mRNA for CXCL12 in plaque-stage MF was significantly higher than in control skin (P = 0.0035), or patch-stage (P = 0.0108) or tumour-stage disease (P = 0.0089). The CXCR4 mRNA expression level in plaque-stage disease was significantly higher than in control skin (P = 0.0090) or patch-stage disease (P = 0.0387). CXCL12- and CXCR4-positive cell rates in patch-stage and plaque-stage MF were significantly higher than those in control skin (P < 0.0001). CXCL12- and CXCR4-positive cell rates in tumour-stage MF were significantly lower than those in patch- and plaque-stage disease (P = 0.0274 and P = 0.0492, respectively).


CONCLUSIONS
Our data suggest that neoplastic T cells in MF are exposed to the microenvironment, given the abundance of CXCL12 during its progression, and also that neoplastic T cells express CXCR4, especially in the pretumour stage. We reveal that the CXCL12-CXCR4 axis plays a critical role in MF progression.
Department of Comprehensive Pathology, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo, 113-8519, Japan.
R N
RN
Daggett
M
M
Kurata
S
S
Abe
I
I
Onishi
K
K
Miura
Y
Y
Sawada
T
T
Tanizawa
M
M
Kitagawa
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D016022:Case-Control Studies; D054377:Chemokine CXCL12 / Q000378:metabolism*; D018450:Disease Progression; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D008264:Macrophages / Q000378:metabolism; D008297:Male; D008875:Middle Aged; D009182:Mycosis Fungoides / Q000378:metabolism*; D012333:RNA, Messenger / Q000378:metabolism; D019718:Receptors, CXCR4 / Q000378:metabolism*; D020133:Reverse Transcriptase Polymerase Chain Reaction; D012867:Skin / Q000378:metabolism; D012878:Skin Neoplasms / Q000378:metabolism*; D013601:T-Lymphocytes / Q000378:metabolism
C527276:CXCR4 protein, human; D054377:Chemokine CXCL12; D012333:RNA, Messenger; D019718:Receptors, CXCR4