Systemic and local collagen turnover in hernia patients

Area of Science:

• Biochemistry
• Connective Tissue Biology
• Surgical Research

Background:

• Hernia formation is multifactorial, influenced by endogenous and exogenous factors.
• Altered collagen composition, particularly increased breakdown, contributes to abdominal wall hernias.
• Collagen alterations are systemic, affecting fascia and skin, and are more pronounced in recurrent hernias.

Purpose of the Study:

• To investigate systemic and local collagen turnover in patients with primary inguinal, multiple, and incisional hernias.
• To identify potential systemic biomarkers for hernia disease.
• To explore the relationship between hernia types and systemic predisposition.

Main Methods:

• Systematic literature review of 55 articles on connective tissue alterations in hernia patients.
• Nationwide study analyzing 92,283 inguinal hernia repairs and 843 ventral hernia repairs.
• Cohort study measuring serum matrix metalloproteinases (MMPs) and tissue inhibitors of metalloproteinases (TIMPs).
• Analysis of serological biomarkers for collagen turnover (types I, III, IV, V) and wound healing potential via ePTFE tubes and fascia transversalis biopsies.

Main Results:

• A decreased type I to III collagen ratio was observed in inguinal and incisional hernias, most notably in direct and recurrent inguinal hernias.
• Systemic MMP-9 and TIMP-1 levels did not differ between hernia patients and controls.
• Type IV collagen turnover was significantly increased in both inguinal and incisional hernia patients and may predict hernia presence.
• No significant differences in total collagen concentration or morphology were found in fascia transversalis biopsies.

Conclusions:

• Direct and recurrent inguinal hernia repairs are associated with ventral hernia repair, indicating a systemic predisposition.
• MMPs are not suitable serum biomarkers for hernia disease.
• Altered collagen turnover, especially type IV, shows potential as a systemic biomarker for predicting hernia disease, aiding tailored surgical strategies.