# Establishment and application of a new 4/6 infarct nephrectomy rat model for moderate chronic kidney disease

## TL;DR

Researchers created a new rat model for moderate chronic kidney disease by modifying a standard surgical procedure and tested a supplement's effectiveness.

## Contribution

A new 4/6 infarct nephrectomy rat model was developed to better mimic moderate chronic kidney disease.

## Key findings

- The 4/6 INx model showed less severe kidney damage compared to the conventional 5/6 INx model.
- A supplementary compound reduced blood urea nitrogen in the 4/6 INx group but not in the 5/6 INx group.
- The 4/6 INx model may be useful for evaluating drugs and supplements for CKD prevention and treatment.

## Abstract

To develop a new 4/6 infarct nephrectomy (INx) model rat mimicking moderate chronic kidney disease (CKD) and to evaluate its application.

We modified the conventional 5/6 INx rat model to create the 4/6 INx model by ligating the renal artery branch to induce infarction of one-third of the left kidney after right kidney removal and compared biochemically and histologically both models. To demonstrate the application of the 4/6 INx model, the effects of a supplementary compound containing calcium carbonate, chitosan, palm shell activated charcoal etc., that is effective for both CKD and its complications, were compared between both models.

Impairment of renal function in the 4/6 INx group was significantly more moderate than in the 5/6 INx group (P < 0.05). The 4/6 INx group showed less histological damage in kidney than in the 5/6 INx group. The supplementary compound did not improve CKD in the 5/6 INx group, but ameliorated elevation of blood urea nitrogen in the 4/6 INx group.

We developed the 4/6 INx model, which is more moderate than the conventional 5/6 INx model. This model could potentially demonstrate the effectiveness of drugs and supplements intended to prevent CKD and its progression.