Verification of renal tissue regeneration using human perinephric fat-derived collagen sheet in a partially nephrectomized animal model.

Chronic kidney disease (CKD), a global health issue, affects approximately 10% of the population. However, limited treatment options, such as dialysis or transplantation, have significant drawbacks. Therefore, this study aims to investigate the potential of a collagen sheet derived from human perirenal adipose tissue for kidney regeneration. Collagen sheets were derived from discarded perirenal adipose tissues and implanted into partially nephrectomized mice. The right kidneys were completely removed, and 2 mm of the upper and lower poles of the left kidneys were resected. A collagen sheet measuring 1 × 1 × 3 mm³ was implanted in the mid-pole of the left kidney following partial resection of renal parenchyme. Renal function, inflammation, and tissue regeneration were evaluated using serum analysis, PCR, histological staining, and immunohistochemistry to assess structural and functional improvements. The collagen sheet reduced pro-inflammatory markers, minimized fibrosis, and restored renal function indicators such as BUN and cystatin C, though creatinine levels remained unchanged. Regenerative markers, including PAX2 and Wt1, were significantly elevated, indicating enhanced tissue repair and structural recovery. The perirenal adipose tissue-derived collagen sheet demonstrated anti-inflammatory effects and promoted renal tissue regeneration. These findings suggest its potential as a biomaterial for renal injury management. However, further research is needed to evaluate long-term efficacy, optimize application methods, and ensure clinical safety.