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2015 ; 109
(5
): 374-90
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English Wikipedia
Increased Expression of Connective Tissue Growth Factor (CTGF) in Multiple Organs
After Exposure of Non-Human Primates (NHP) to Lethal Doses of Radiation
#MMPMID26425899
Zhang P
; Cui W
; Hankey KG
; Gibbs AM
; Smith CP
; Taylor-Howell C
; Kearney SR
; MacVittie TJ
Health Phys
2015[Nov]; 109
(5
): 374-90
PMID26425899
show ga
Exposure to sufficiently high doses of ionizing radiation is known to cause
fibrosis in many different organs and tissues. Connective tissue growth factor
(CTGF/CCN2), a member of the CCN family of matricellular proteins, plays an
important role in the development of fibrosis in multiple organs. The aim of the
present study was to quantify the gene and protein expression of CTGF in a
variety of organs from non-human primates (NHP) that were previously exposed to
potentially lethal doses of radiation. Tissues from non-irradiated NHP and NHP
exposed to whole thoracic lung irradiation (WTLI) or partial-body irradiation
with 5% bone marrow sparing (PBI/BM5) were examined by real-time quantitative
reverse transcription PCR, western blot, and immunohistochemistry. Expression of
CTGF was elevated in the lung tissues of NHP exposed to WTLI relative to the lung
tissues of the non-irradiated NHP. Increased expression of CTGF was also observed
in multiple organs from NHP exposed to PBI/BM5 compared to non-irradiated NHP;
these included the lung, kidney, spleen, thymus, and liver. These irradiated
organs also exhibited histological evidence of increased collagen deposition
compared to the control tissues. There was significant correlation of CTGF
expression with collagen deposition in the lung and spleen of NHP exposed to
PBI/BM5. Significant correlations were observed between spleen and multiple
organs on CTGF expression and collagen deposition, respectively, suggesting
possible crosstalk between spleen and other organs. These data suggest that CTGF
levels are increased in multiple organs after radiation exposure and that
inflammatory cell infiltration may contribute to the elevated levels of CTGF in
multiple organs.