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Silicone induces strong local T-cell immune response.
2004 OCT 7 - (NewsRx.com & NewsRx.net) -- Silicone in breast implants induces a strong local response by T lymphocytes, but why this is remains unclear.
"During the past 30 years, much debate has centered around side effects of silicone breast implants. Meta-analyses rejected the presumed relationship between silicone breast implants and connective tissues diseases, but, in seeming contradiction, case reports about connective tissue diseases and rheumatoid symptoms continue to be published," wrote W. Dolores and colleagues at Innsbruck University, Austria.
"We analyzed the cellular and molecular composition of fibrous capsules removed from patients at various times after surgery for diagnostic purposes (breast cancer relapse) or to relieve painful constrictive fibrosis. Frozen sections of capsule tissue were immunohistochemically stained for subsets of lymphocytes, macrophages, dendritic cells, fibroblasts, smooth muscle cells, for collagenous and non-collagenous extracellular matrix proteins, for heat shock protein 60 (HSP60), and for adhesion molecules," the researchers said.
They observed "[m]assive deposition of fibronectin and tenascin ... adjacent to the implant surface. The capsule/silicone implant contact zone was consistently characterized by a palisade-like single or multilayered cell accumulation consisting of HSP60 + macrophages and HSP60 + fibroblasts."
Additionally, reported Dolores and coworkers, "Mononuclear cell infiltrates consisting of activated CD4 + T cells, expressing ...
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Source: HighBeam Research, Silicone induces strong local T-cell immune response.