Triggers, bullets and targets, puzzle of membranous nephropathy

Mohammadreza Ardalan1

  • 1Nephrology Department, Tabriz University of Medical sciences, Tabriz, IR Iran ; Mario NegriInstitute of Pharmacological Research, Bergamo, Italy.

Nephro-Urology Monthly
|April 11, 2013
PubMed
Abstract

Insights

Idiopathic Membranous Nephropathy (MN) is linked to the M-type phospholipase A2 receptor (PLA2-R). Rituximab shows promise as a treatment for MN patients requiring immunosuppression.

Area of Science:

  • Nephrology
  • Immunology
  • Pathophysiology

Background:

  • Idiopathic Membranous Nephropathy (MN) is a primary cause of nephrotic syndrome in adults.
  • The M-type phospholipase A2 receptor (PLA2-R) is identified as the key podocyte antigen in MN pathogenesis.
  • Recent findings highlight the pathogenic role of anti-PLA2-R antibodies.

Purpose of the Study:

  • To review the literature on membranous nephropathy, rituximab, and PLA2-R.
  • To summarize current understanding of PLA2-R's role in idiopathic MN.
  • To evaluate rituximab as a therapeutic option for MN.

Main Methods:

  • A mini-review of English-language MEDLINE literature.
  • Search terms included "membranous nephropathy", "rituximab", and "phospholipase A2 receptor".
  • Literature search conducted up to October 2011.

Main Results:

  • Reports confirm the pathogenic role of IgG4 antibodies against PLA2-R in idiopathic MN.
  • Rare cases involve antibodies against aldose reductase (AR) and manganese superoxide dismutase (SOD2).
  • Rituximab is suggested as a viable therapeutic choice for immunosuppression in MN.

Conclusions:

  • Significant advancements have been made in diagnosing and treating idiopathic MN.
  • The precise pathogenic mechanisms and triggers for anti-PLA2-R antibody production remain undetermined.

Related Concept Videos

Nephrotic Syndrome I : Introduction01:24

Nephrotic Syndrome I : Introduction

Nephrotic Syndrome is a chronic kidney disorder defined by clinical findings such as severe proteinuria, hypoalbuminemia, hyperlipidemia, and edema. These symptoms result from damage to the glomeruli, the kidney’s filtering units, increasing their permeability to proteins.Definition and Meaning:Proteinuria, defined as the loss of more than 3.5 grams of protein per day in adults, is a crucial feature of nephrotic syndrome. This condition is often accompanied by edema, the accumulation of fluid...
Renal Corpuscle01:20

Renal Corpuscle

The glomerulus and Bowman's capsule are two essential components of the nephron, which is the functional unit of the kidney. These microscopic structures play a critical role in the process of blood filtration to produce urine.
Glomerulus: Structure and Function
The glomerulus is a tiny, intricate network of capillaries located at the beginning of the nephron. It's enveloped by the Bowman's capsule and receives its blood supply from an afferent arteriole, which divides into numerous capillaries...
Nephrons01:10

Nephrons

The kidneys are intricate organs with millions of working units known as nephrons. Each nephron features two major structures: the renal corpuscle, which facilitates blood plasma filtration, and the renal tubule, which handles the glomerular filtrate. Blood supply is directly linked to the nephrons. The renal corpuscle consists of the glomerulus, a capillary network, and the Bowman's capsule, a double-walled epithelial structure that encases the glomerulus. The filtering of blood plasma happens...
Diabetic Nephropathy01:28

Diabetic Nephropathy

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 occur due to afferent arteriolar...
Transducer Mechanism: Enzyme-Linked Receptors01:27

Transducer Mechanism: Enzyme-Linked Receptors

Enzyme-linked receptors are cell-surface receptors acting as an enzyme or associating with an enzyme intracellularly. They make excellent drug targets. Drugs can bind to the extracellular ligand-binding domain or directly affect their enzymatic domain and alter their activity.
Major types that are helpful drug targets include:
Enzyme-linked Receptors01:00

Enzyme-linked Receptors

Enzyme-linked receptors are proteins that act as both receptor and enzyme, activating multiple intracellular signals. This is a large group of receptors that include the receptor tyrosine kinase (RTK) family. Many growth factors and hormones bind to and activate the RTKs.
Neurotrophin (NT) receptors are a family of RTKs, including trkA, trkB, and trkC (tropomyosin-related kinase) receptors. TrkA is specific for nerve growth factor (NGF), neurotrophin-6, and neurotrophin-7. TrkB binds...