Heat Shock Protein Mechanisms in Renal Pathophysiology

Heat shock proteins (HSPs) are molecular chaperones that safeguard proteostasis during renal stress. They facilitate protein folding and prevent aggregation, modulate signalling cascades, and attenuate apoptosis. In the kidney, HSP70 family members support mitochondrial integrity and calcium homeostasis in acute ischaemia–reperfusion injury, whereas small HSPs such as HSP27 regulate cytoskeletal dynamics and inflammatory responses. Collagen-specific chaperones like HSP47 contribute to extracellular matrix deposition and fibrogenesis in chronic nephropathies. Osp94, a member of the HSP110 subfamily, maintains cell viability in the hyperosmolar medullary environment. Activation of heat shock factor 1 drives transcriptional upregulation of HSPs following hypoxia, oxidative stress and toxic insults. Dysregulated expression has been linked to acute kidney injury, diabetic nephropathy, chronic fibrosis and the cardiorenal syndrome. Beyond protective roles, extracellular HSPs can act as danger signals, modulating immune responses and influencing tubular injury and repair. These insights underpin the development of HSP-based diagnostics and therapeutic strategies, including pharmacological preconditioning, targeted inhibition of maladaptive chaperones and novel biomarker applications to monitor renal function and guide personalised interventions.

Research from Nature Portfolio

Recent studies have elucidated how stabilisation of hypoxia-inducible factors alters renal epithelial cell behaviour during acute injury. Pharmacological induction of HIF caused prominent cytoskeletal remodelling in tubular cells, leading to reduced collective migration and impaired wound closure. This effect was accompanied by reorganisation of actin stress fibres, enhanced focal adhesion complexes and keratin filament bundling. These findings reveal a direct link between HIF signalling, chaperone-mediated cytoskeletal support and the regenerative capacity of renal epithelium following hypoxic stress. By defining these molecular interconnections, the work highlights potential strategies to modulate epithelial repair in acute kidney injury without exacerbating maladaptive remodelling.

Heat Shock Protein Mechanisms in Renal Pathophysiology publication trend

The graph below shows the total number of articles in heat shock protein mechanisms in renal pathophysiology across all publications each year (not limited to Nature Index journals).

Technical terms

Heat shock proteins (HSPs): A family of conserved molecular chaperones that assist protein folding and protect cells from stress.

Ischaemia–reperfusion injury: Tissue damage caused by restoration of blood flow after a period of oxygen deprivation.

Hypoxia-inducible factor (HIF): A transcription factor stabilised in low-oxygen conditions that regulates adaptive gene expression.

Mitochondrial permeability transition pore (mPTP): A channel whose opening leads to loss of mitochondrial membrane potential and can trigger cell death.

Chaperone-mediated cytoskeletal support: The role of HSPs in facilitating assembly and stability of cytoskeletal elements under stress.

References

1. Heat Shock Protein 70 Is Involved in the Efficiency of Preconditioning with Cyclosporine A in Renal Ischemia Reperfusion Injury by Modulating Mitochondrial Functions. International Journal of Molecular Sciences (2023).
2. Mild Therapeutic Hypothermia Protects from Acute and Chronic Renal Ischemia-Reperfusion Injury in Mice by Mitigated Mitochondrial Dysfunction and Modulation of Local and Systemic Inflammation. International Journal of Molecular Sciences (2022).
3. Advanced Glycation End Products Increase Collagen-specific Chaperone Protein in Mouse Diabetic Nephropathy*. Journal of Biological Chemistry (2004).
4. Osmotic Stress Protein 94 (Osp94) A NEW MEMBER OF THE Hsp110/SSE GENE SUBFAMILY (∗). Journal of Biological Chemistry (1996).
5. HIF stabilization inhibits renal epithelial cell migration and is associated with cytoskeletal alterations. Scientific Reports (2018).