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Positive C1q staining associated with poor renal outcome in membranoproliferative glomerulonephritis
Takashi Takei1, Mitsuyo Itabashi, Takahito Moriyama
1Department of Medicine, Kidney Center, Tokyo Women's Medical University, 8-1 Kawada-cho, Shinjuku-ku, Tokyo 162-8666, Japan. ttakei@kc.twmu.ac.jp
Background:
Pathogenesis and clinical prognosis of membranoproliferative glomerulonephritis (MPGN) has not yet been established.
Methods:
We conducted a retrospective study of 41 patients with MPGN (type I and III) and examined the renal survival. In addition, factors contributing to survival time were analyzed.
Results:
Fourteen patients (34 %) were classified into the renal death group. Patients with nephrotic syndrome and positive C1q staining of glomerular deposits showed a particularly poor prognosis. Significantly higher frequency of nephrotic syndrome and higher urinary protein excretion were observed in the renal death group (p = 0.0002, p = 0.0002) than in the renal survival group. The intensity of C1q staining was positively correlated with the severity of the proteinuria (p = 0.004). Factors that influenced the survival time were positive C1q staining of glomerular deposits (p = 0.003), presence of nephrotic syndrome (p = 0.004), serum albumin (p = 0.02), and proteinuria (p = 0.04).
Conclusions:
C1q staining in glomerular deposits and nephrotic syndrome were important factors influencing the prognosis and outcome in MPGN patients. C1q deposition may play a key role in the pathogenesis of MPGN, as evidenced by numerous observations, such as induction of proteinuria.
Insights
Prognosis for membranoproliferative glomerulonephritis (MPGN) is poor with nephrotic syndrome and C1q deposition. These factors significantly impact renal survival in MPGN patients.
Area of Science:
- Nephrology
- Immunopathology
Background:
- The pathogenesis and clinical prognosis of membranoproliferative glomerulonephritis (MPGN) remain incompletely understood.
- Establishing clear prognostic markers is crucial for managing MPGN patients.
Purpose of the Study:
- To investigate the renal survival and identify prognostic factors in patients with MPGN (types I and III).
- To analyze the correlation between specific clinical and pathological findings and patient outcomes.
Main Methods:
- Retrospective analysis of 41 patients diagnosed with MPGN (types I and III).
- Evaluation of renal survival rates and identification of factors influencing survival time.
- Assessment of clinical parameters including nephrotic syndrome, proteinuria, and serum albumin levels.
- Analysis of glomerular C1q staining intensity.
Main Results:
- 34% of patients experienced renal death.
- Nephrotic syndrome and positive C1q staining were associated with a poor prognosis.
- Higher urinary protein excretion and nephrotic syndrome were significantly more frequent in the renal death group (p=0.0002).
- C1q staining intensity correlated positively with proteinuria severity (p=0.004).
- Factors influencing survival included C1q staining (p=0.003), nephrotic syndrome (p=0.004), serum albumin (p=0.02), and proteinuria (p=0.04).
Conclusions:
- C1q staining in glomerular deposits and the presence of nephrotic syndrome are critical indicators of prognosis in MPGN.
- C1q deposition likely plays a significant role in MPGN pathogenesis, potentially by inducing proteinuria.
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