Age-Dependent Remodeling in Infrapatellar Fat Pad Adipocytes and Extracellular Matrix: A Comparative Study

Elena Stocco, Elisa Belluzzi, Martina Contran, Rafael Boscolo-Berto, Edgardo Picardi, Diego Guidolin, Chiara Giulia Fontanella, Eleonora Olivotto, Giuseppe Filardo, Giulia Borile, Filippo Romanato, Roberta Ramonda, Pietro Ruggieri, Marta Favero, Andrea Porzionato, Raffaele De Caro, Veronica Macchi

Research output: Contribution to journalArticlepeer-review

Abstract

The infrapatellar fat pad (IFP) is actively involved in knee osteoarthritis (OA). However, a proper description of which developmental modifications occur in the IFP along with age and in absence of joint pathological conditions, is required to adequately describe its actual contribution in OA pathophysiology. Here, two IFP sources were compared: (a) IFP from healthy young patients undergoing anterior-cruciate ligament (ACL) reconstruction for ACL rupture (n = 24); (b) IFP from elderly cadaver donors (n = 23). After histopathological score assignment to confirm the absence of inflammatory features (i.e., inflammatory infiltrate and increased vascularity), the adipocytes morphology was determined; moreover, extracellular matrix proteins were studied through histology and Second Harmonic Generation approach, to determine collagens content and orientation by Fast Fourier Transform and OrientationJ. The two groups were matched for body mass index. No inflammatory signs were observed, while higher area, perimeter, and equivalent diameter and volume were detected for the adipocytes in the elderly group. Collagen III displayed higher values in the young group and a lower total collagen deposition with aging was identified. However, collagen I/III ratio and the global architecture of the samples were not affected. A higher content in elastic fibers was observed around the adipocytes for the ACL-IFPs and in the septa cadaver donor-IFPs, respectively. Age affects the characteristics of the IFP tissue also in absence of a pathological condition. Variable mechanical stimulation, depending on age-related different mobility, could be speculated to exert a role in tissue remodeling.

Original languageEnglish
Pages (from-to)1-13
Number of pages13
JournalFrontiers in Medicine
Volume8
DOIs
Publication statusPublished - May 10 2021

Keywords

  • aging
  • anterior-cruciate ligament rupture
  • cadaver donors
  • extracellular matrix
  • infrapatellar fat pad
  • osteoarthritis

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