Toll-Like Receptors (TLRs) Expression in Contracted Capsules Compared to Uncontracted Capsules

Area of Science:

• Immunology
• Biomaterials Science
• Surgical Pathology

Background:

• Capsular contracture following breast implant surgery is a common complication with unclear etiology.
• The immune system, particularly Toll-like receptors (TLRs), is implicated in its development.
• TLRs recognize pathogen- and damage-associated molecular patterns, relevant to bacterial presence (e.g., Staphylococcus epidermidis) and mechanical stress.

Purpose of the Study:

• To investigate the expression levels of Toll-like receptors (TLRs) 1-10 in relation to the severity of capsular contracture.
• To determine if specific TLRs are associated with the presence or absence of capsular contracture.

Main Methods:

• Fifty breast capsules were collected during implant removal or replacement and scored using the Baker scale.
• Messenger RNA (mRNA) was extracted, and complementary DNA (cDNA) was synthesized.
• Polymerase Chain Reaction (PCR) was used to quantify the expression of TLRs 1-10 in relation to Baker scores.

Main Results:

• All tested Toll-like receptors (TLRs) were expressed across all Baker scores.
• TLR2 and TLR6 were observed more frequently in contracted capsules (Baker 3 or 4) compared to non-contracted capsules (Baker 1 or 2).
• No significant difference in the concentration of any TLR was found between contracted and uncontracted capsules.

Conclusions:

• TLR2 and TLR6 expression is more common in breast implant capsules with contracture.
• While TLR2 and TLR6 are more frequently present, their concentrations do not significantly increase in contracted capsules.
• These findings suggest a potential role for TLR2 and TLR6 in the pathogenesis of capsular contracture.