What role do lysosomal pathways play in the progression of autoimmune kidney disease like lupus nephritis?

Lupus nephritis is a severe kidney complication of systemic lupus erythematosus (SLE) where the immune system attacks the kidneys. Lysosomes are cellular compartments that break down waste and help control immune responses. Recent research shows that lysosomal pathways act as 'checkpoints' that can either keep the immune system in balance or push it toward attacking the body's own tissues. In lupus nephritis, these lysosomal checkpoints become disrupted, leading to improper processing of self-antigens, activation of harmful immune cells, and metabolic changes that worsen kidney damage.

What the research says

A systematic review highlights that lysosomes serve as critical hubs for degradation and signaling, maintaining immune homeostasis. In autoimmune kidney diseases like lupus nephritis, lysosomal functions are conceptualized as 'checkpoints' that regulate autoantigen processing and presentation, immune cell activation, and breakdown of tolerance. Disruption of these checkpoints can lead to the initiation and progression of kidney autoimmunity ³.

Lysosomal pathways also intersect with metabolic reprogramming in lupus nephritis. Glucose metabolic shifts, including increased glycolysis and changes in the pentose phosphate pathway, drive pathogenic immune cell activation. These metabolic alterations are linked to lysosomal function, as lysosomes sense nutrient availability and influence immune cell metabolism. Targeting these pathways may offer new therapeutic strategies ⁷.

Additionally, intracellular complement activity, known as the 'complosome,' is connected to lysosomal processes. The complement system, beyond its traditional immune roles, can regulate metabolism, autophagy (a lysosomal degradation process), and gene expression inside cells. Dysregulation of both extracellular and intracellular complement is implicated in lupus nephritis, suggesting that lysosomal and complement pathways interact to promote kidney injury ⁴.

What to ask your doctor

• Could lysosomal pathway dysfunction be contributing to my lupus nephritis progression?
• Are there any treatments that target lysosomal checkpoints or metabolic pathways in lupus nephritis?
• How do my current medications (e.g., hydroxychloroquine, mycophenolate) affect lysosomal function?
• Should I consider participating in clinical trials for drugs that modulate lysosomal or metabolic pathways?
• What lifestyle changes (e.g., diet, exercise) might help support lysosomal health and reduce kidney inflammation?