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Definition Diabetic nephropathy is a chronic kidney complication that results from prolonged hyperglycemia.Prevalence It is the most common cause of chronic kidney disease (CKD) and end-stage renal disease (ESRD) worldwide, affecting up to half of individuals with diabetes.Pathophysiology • Sustained hyperglycemia triggers multiple hemodynamic and metabolic changes in the kidney. • Early in the disease, increased renal blood flow and glomerular hyperfiltration...
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DefinitionDiabetic neuropathy is nerve damage caused by long-standing diabetes mellitus. It results directly from prolonged high blood sugar levels.PathophysiologyThe pathophysiology of diabetic neuropathy involves both metabolic and vascular disturbances triggered by chronic hyperglycemia.Metabolic injury: Elevated glucose levels activate the polyol pathway within nerve cells, leading to the accumulation of sorbitol and fructose. This increases oxidative stress, disrupts normal nerve...
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DefinitionDiabetic retinopathy is a microvascular complication of diabetes affecting the retinal blood vessels.Risk FactorsDiabetic retinopathy is present in almost all individuals with type 1 diabetes and more than 60% of those with type 2 diabetes after two decades of disease.The risk increases with poor glycemic control, hypertension, dyslipidemia, smoking, pregnancy, and puberty.Although cataracts and glaucoma are also more frequent in people with diabetes, retinopathy remains the leading...
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Nursing management for nephrotic syndrome adapts as the disease progresses, with strategies evolving to address advancing symptoms and complications.Early-Stage Management In the early stages, nursing interventions for nephrotic syndrome resemble those used in managing acute glomerulonephritis, focusing on symptom monitoring, fluid balance, and managing mild to moderate edema.Vital Signs: Regularly monitor blood pressure, pulse, respiratory rate, and temperature to promptly identify...
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Semaphorin3a promotes advanced diabetic nephropathy.

Pardeep K Aggarwal1, Delma Veron1, David B Thomas2

  • 1Department of Pediatrics/Nephrology, Yale University School of Medicine, New Haven, CT.

Diabetes
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Summary

Excess semaphorin3a (sema3a) in podocytes drives diabetic nephropathy (DN) progression. Inhibiting sema3a or its interaction with plexinA1 shows therapeutic potential for DN.

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Area of Science:

  • Nephrology
  • Molecular Biology
  • Pathology

Background:

  • Diabetic nephropathy (DN) is characterized by glomerular filtration barrier damage.
  • Identifying key pathogenic factors in DN is essential for developing new treatments.
  • Semaphorin3a (sema3a), a podocyte-secreted protein, is implicated in DN pathogenesis.

Purpose of the Study:

  • To investigate the role of excess semaphorin3a (sema3a) in the development and progression of diabetic nephropathy (DN).
  • To identify molecular pathways and potential therapeutic targets involved in sema3a-mediated DN.

Main Methods:

  • Immunohistochemistry on human renal biopsies.
  • Inducible, podocyte-specific Sema3a gain-of-function mouse models of diabetes.
  • Assessment of proteinuria, renal function, and glomerular histology.
  • Analysis of molecular interactions involving nephrin, αvβ3 integrin, MICAL1, and plexinA1.

Main Results:

  • Increased podocyte SEMA3A expression in human DN biopsies.
  • Diabetic mice with podocyte-specific Sema3a overexpression exhibited severe DN phenotypes, including proteinuria and nodular glomerulosclerosis.
  • Sema3a exacerbated podocyte injury via interactions with MICAL1 and plexinA1, leading to foot process effacement.
  • Inhibition of sema3a binding or plexinA1 deletion ameliorated DN markers in mice.

Conclusions:

  • Excess semaphorin3a (sema3a) is a significant driver of diabetic nephropathy (DN) progression.
  • The sema3a-plexinA1-MICAL1 axis is crucial for sema3a-induced podocyte damage in DN.
  • Targeting sema3a or its interaction with plexinA1 represents a promising therapeutic strategy for DN.