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Erschienen in:
21.06.2023 | Original Article
Particles of Different Sizes Affect the Retention Pattern of the Fat Grafts in a Mouse Model
Erschienen in: Aesthetic Plastic Surgery | Ausgabe 5/2023
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Background
Autologous fat grafting is an effective form of soft tissue regeneration. However, the optimal fat particle size and graft retention pattern need more research.
Methods
The mouse inguinal fat pad was harvested and cut into fat particles of different diameters: ≥ 5 mm, 3–4 mm, 2–3 mm, 1–2 mm and 1 mm (micro-fat). A volume of 0.2 ml fat was transplanted into another mouse dorsum. Volume and retention rate were measured at 1, 4, 8 and 12 weeks. Histology analysis was performed. Immunofluorescence staining was used to evaluate M1 and M2 macrophage infiltration and graft angiogenesis.
Results
Fat retention was highest in the “> 5 mm” group and lowest in the “micro-fat” group. Large vacuoles were more common in larger-diametered fat particles. There was less collagen accumulation in the well-vascularized connective tissue in the “1–2 mm” group. The infiltrated nucleated cells peak at week 4 in groups of fat particles under 3 mm and at week 8 in in groups with fat particles above 3 mm. The number of M1 macrophages peaked at week 1 and then declined in all groups except for the “5 mm” group. The number of M2 macrophages peaked at week 4 and gradually decreased through 12 weeks in the groups below 3 mm, but increased through 12 weeks in the groups above 3 mm. Vascular intensity was similar to M2 macrophage prevalence.
Conclusions
Fat particles of different sizes may posses different retention patterns. Larger grafts have higher retention rate but worse quality. Meanwhile, smaller grafts have better quality with lower retention rate.
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