Gene expression of collagen types IX and X in the lumbar disc.
OBJECTIVE
To study gene expression of collagen types IX and X in human lumbar intervertebral discs during aging and degeneration and to explore the role of collagen types IX and X in disc degeneration.


METHODS
Fetal, adult and pathologic specimens were subjected to in situ hybridization with cDNA probes to investigate mRNA-expressions of types IX and X collagen gene.


RESULTS
In fetal intervertebral discs, positive mRNA hybridization signals of type IX collagen were concentrated in the nucleus pulposus and the inner layer of anulus fibrosus. Interstitial matrix of the nucleus pulposus also showed positive type X collagen staining. Positive mRNA hybridization signals of types IX and X were not detected in the middle and outer layers of anulus fibrosus. In adult specimens, expression of type IX collagen mRNA was markedly decreased. No hybridization signals of type X collagen was observed. As for pathological specimens, there was no gene expression of type IX collagen. In severe degenerated discs from adults, there were focal positive expressions of type X collagen.


CONCLUSIONS
Obvious changes of collagen gene expression occur with aging. Expression of type IX collagen decreases in adult and pathological discs. Results of type X collagen expression suggest that type X collagen is expressed only in older adult and senile discs (i.e., when disc degeneration has already reached a terminal stage), indicating the terminal stage of degeneration.
Xi
Yong-ming
YM
Department of Orthopaedics, Affiliated Hospital of Qingdao Medical College, Qingdao University, Qingdao 266003, China.
Hu
You-gu
YG
Lü
Zhen-hua
ZH
Zheng
Hong-jun
HJ
Chen
Yan
Y
Qi
Zonghua
Z
D000293:Adolescent; D000328:Adult; D024081:Collagen Type IX / Q000378:metabolism*; D024121:Collagen Type X / Q000378:metabolism*; D005260:Female; D015870:Gene Expression; D006801:Humans; D007150:Immunohistochemistry; D017403:In Situ Hybridization; D007403:Intervertebral Disc / Q000196:embryology / Q000378:metabolism*; D008159:Lumbar Vertebrae; D008297:Male
D024081:Collagen Type IX; D024121:Collagen Type X