Interleukin-1-induced subacromial synovitis and shoulder pain in rotator cuff diseases.
OBJECTIVE
To determine the relationship between the expression of interleukin-1beta (IL-1beta) and IL-1 receptor antagonists (IL-1ra) in the subacromial bursa and shoulder pain in rotator cuff diseases.


METHODS
Synovial specimens were analysed using various methods including reverse transcriptase-polymerase chain reaction (RT-PCR), immunohistochemistry and in situ RT-PCR. Thirty-nine patients with rotator cuff diseases were candidates. The degree of their shoulder pain was evaluated using a visual analogue scale.


RESULTS
The mRNA expression levels of the cytokines were significantly correlated with the degree of pain [IL-1beta: r=0.782; secreted IL-1ra (sIL-1ra): r=0.756; intracellular IL-1ra (icIL-1ra): r=0.806, P<0.001, respectively]. The combined results of immunohistochemistry and in situ RT-PCR analysis indicated that both synovial lining and sublining cells produce IL-1beta, while synovial lining cells predominantly produce icIL-1ra and sublining cells secrete sIL-1ra.


CONCLUSIONS
The differential regulation of the two forms of IL-1ra mRNAs may play an important role in shoulder pain in rotator cuff diseases, regulating IL-1-induced subacromial synovitis.
Gotoh
M
M
Department of Orthopaedic Surgery, Department of Pathology, Tokai University School of Medicine, Isehara, Kanagawa, Japan.
Hamada
K
K
Yamakawa
H
H
Yanagisawa
K
K
Nakamura
M
M
Yamazaki
H
H
Ueyama
Y
Y
Tamaoki
N
N
Inoue
A
A
Fukuda
H
H
D000328:Adult; D000368:Aged; D002061:Bursa, Synovial / Q000378:metabolism / Q000473:pathology; D006801:Humans; D007124:Immunoenzyme Techniques; D053590:Interleukin 1 Receptor Antagonist Protein; D007375:Interleukin-1 / Q000235:genetics / Q000378:metabolism*; D008875:Middle Aged; D010147:Pain Measurement; D012313:RNA / Q000032:analysis; D012333:RNA, Messenger / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D017006:Rotator Cuff / Q000378:metabolism* / Q000503:physiopathology; D019534:Shoulder Impingement Syndrome / Q000150:complications / Q000378:metabolism* / Q000503:physiopathology; D020069:Shoulder Pain / Q000209:etiology / Q000378:metabolism*; D012795:Sialoglycoproteins / Q000235:genetics / Q000378:metabolism; D013583:Synovial Membrane / Q000378:metabolism / Q000473:pathology; D013585:Synovitis / Q000378:metabolism* / Q000503:physiopathology
C507763:IL1RN protein, human; D053590:Interleukin 1 Receptor Antagonist Protein; D007375:Interleukin-1; D012333:RNA, Messenger; D012795:Sialoglycoproteins; D012313:RNA