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Related Experiment Video

Updated: Jun 1, 2026

A "Dual-Addition" Calcium Fluorescence Assay for the High-Throughput Screening of Recombinant G Protein-Coupled Receptors

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The kallikrein-kinin system.

Sydney Cw Tang, Joseph C K Leung, Kar Neng Lai

Contributions to Nephrology

|June 11, 2011

Summary

The kallikrein-kinin system (KKS) has a complex role in diabetic nephropathy (DN). Evidence suggests both protective and damaging effects, requiring further research to clarify its function in kidney disease.

Area of Science:

Nephrology
Endocrinology
Biochemistry

Background:

The kallikrein-kinin system (KKS) is implicated in diabetic nephropathy (DN) pathogenesis.
Key components include tissue kallikrein 1, kinins (like bradykinin, BK), and their receptors (B2R, B1R).
KKS components are present in the kidney, with kallikrein 1 found in proximal tubules of diabetic kidneys.

Purpose of the Study:

To review and analyze the conflicting evidence regarding the role of the KKS in DN.
To highlight the dual nature of KKS involvement, potentially protective or detrimental.
To emphasize the need for further investigation into KKS function in diabetic tubulopathy.

Main Methods:

Review of existing scientific literature on KKS and DN.
Analysis of studies using genetic models (e.g., B2R-/-, KLK-/- mice) and pharmacological interventions (e.g., icatibant).

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Examination of cellular and molecular mechanisms, including cytokine and growth factor expression.

Main Results:

Conflicting data exists: BK may reduce mesangial cell proliferation, and KKS deficiency exacerbates DN in some models.
Conversely, BK can upregulate pro-inflammatory mediators, and B2R blockade shows protective effects in other DN models.
These opposing findings suggest context-dependent roles for the KKS in DN.

Conclusions:

The role of the KKS in DN is complex and appears to be both renoprotective and detrimental.
Further research is essential to elucidate the precise mechanisms and therapeutic potential of targeting the KKS in diabetic kidney disease.
Clarifying the KKS's function is crucial for understanding and treating diabetic tubulopathy.