[Fibrotic remodeling of nasal mucosa in rat model after radiation injury].
OBJECTIVE
To investigate the role of nasal mucosa fibrosis on radiation induced nasal mucosa injury.


METHODS
Seventy two male rats were randomly divided into two groups, control group and irradiation injured group (radiation dose were 40 Gy); the rats were killed 1 week, 2 weeks, 4 weeks, 8 weeks, 3 months and 6 months after the finish of radiation. The middle turbinates of the animals were removed. The pathological change of the nasal mucosa were observed with scanning electron microscope, transmission electron microscope, hematoxylin and eosin (HE), alcian blue-periodic acid-Schif (AB-PAS), and Masson Trichrome (MT). The Hyp content in nasal mucosa was measured with chemo-chromatometry.


RESULTS
After radiation, the pathological characteristics in early stage (within 4 weeks) was acute inflammatory reaction. The repair of nasal mucosa started 4 weeks after radiation, lasted to 6 months. The deposition of collagen in nasal mucosa could be found 1 week after irradiation and increased gradually.


CONCLUSIONS
Irradiation could induce a serials of pathological changes on nasal mucosa. The nasal mucosa fibrosis may be one of the reasons of persistent irradiation induced nasal mucosa injury.
Xiao
Mang
M
Department of Otorhinolaryngology Head and Neck Surgery, Sir Run Run Shaw Hospital, Zhejiang University, Key Laboratory of Biotherapy of Zhejiang Province, Hangzhou 310016, China.
Tang
Jian-Guo
JG
Sun
Xiao-Nan
XN
Jiang
Xiu-Wen
XW
Luo
Bao-Zhen
BZ
Zhao
Li-Na
LN
D000818:Animals; D005355:Fibrosis; D008297:Male; D009297:Nasal Mucosa / Q000473:pathology*; D011833:Radiation Injuries, Experimental / Q000473:pathology*; D051381:Rats; D017207:Rats, Sprague-Dawley; D014945:Wound Healing