Table 1.

Immunostaining pattern of endomysial inflammatory cells and muscle fibers in patients with inflammatory myopathies and control subjects

Endomysial inflammatory cellsNon-necrotic, MHC class I positive muscle fibersRegenerating muscle fibersEndothelial cellsβ-amyloid
+ = present; − = absent.
MMP = matrix metalloproteinase; MHC = major histocompatibility complex; s-IBM = sporadic inclusion body myositis; PM = polymyositis; DM = dermatomyositis; DMD = Duchenne muscular dystrophy; NL = normal.
MMP-2
s-IBM++++
PM+++
DM++
DMD++
ALS+
NL+
MMP-9
s-IBM++++
PM++++
DM+++
DMD+++
ALS+
NL+