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ISSN: 2161-0959
Journal of Nephrology & Therapeutics
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The Treatment of Primary IgA Nephropathy

Dongxu Song, Shengqiang Yu* and Changlin Mei

Division of Nephrology, Nephrology Institute of PLA, Shanghai Changzheng Hospital, Second Military Medical University, Shanghai, China

*Corresponding Author:
Shengqiang Yu
Division of Nephrology
Nephrology Institute of PLA
Shanghai Chang zheng Hospital
Second Military Medical University, Shanghai, China
Tel: 00862181885399
E-mail: [email protected]

Received Date: November 03, 2013; Accepted Date: November 30, 2013; Published Date: December 04, 2013

Citation: Song D, Yu S, Mei C (2013) The Treatment of Primary IgA Nephropathy. J Nephrol Ther 3:144. doi:10.4172/2161-0959.1000144

Copyright: © 2013 Song D, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Abstract

IgA Nephropathy (IgAN) is a very common glomerulonephritis worldwide, especially in Asia, which is an important cause of progressive kidney disease with 25–30% of patients developing end-stage renal disease within 20 years of diagnosis. IgA nephropathy can be in different age bracket onset, but mainly in adults. The treatment of primary IgA nephropathy we mentioned in this article is only for adults. The optimal treatment for IgAN remains poorly defined. The current treatment depends on the assessment of proteinuria, blood pressure, estimated Glomerular Filtration Rate (eGFR) and pathological features, including antiproteinuric and antihypertensive therapy, corticosteroids, immunosuppressive agents, fish oil and tonsillectomy. Compounded by the relative lack in IgAN of Randomized Controlled Trials (RCTs),
there is no consensus on the use of corticosteroids, immunosuppressive agents, fish oil and tonsillectomy for treatment. The treatment of primary IgA Nephrology was reviewed from these aspects in this article.

Keywords

Nephropathy; Glomerular filtration rate; Immunoglobulin

Introduction

IgA nephropathy is a chronic form of glomerulonephritis characterized by deposits of predominantly immunoglobulin A in the glomeruli. Deposits of complement C3 and immunoglobulin G are also often found. This disease can be divided into two types, the primary IgA nephropathy which is caused by kidney itself, and secondary IgA nephropathy, that the glomerular immunoglobulin A deposits are associated with Henoch-Schönlein purpura, HIV infection, negative serum spinal arthritis, tumor, etc. The classic presentation (in 40-50% of the cases) is episodic hematuria which usually starts within a day or two of a non-specific upper respiratory tract infection as opposed to post-streptococcal glomerulonephritis which occurs some time (weeks) after initial infection. Loin pain can also occur. Renal function usually remains normal, though rarely, acute renal failure may occur in younger adults. Nephrotic syndrome occurs in around 5% of cases. Acute renal failure may result from acute tubular necrosis as a consequence of macroscopic hematuria or superimposed crescentic nephritis and is seen during the course of the disease in 5% of cases. 5% of the patients who probably had longstanding undetected microscopic hematuria and/or proteinuria developed to chronic kidney disease [1,2]. Its diagnosis is based on histopathologic and immunoflourescence studies on renal biopsy. ACEI or ARB drugs, antithrombotic agents, steroid, immunosuppressive agents, fish oil and tonsillectomy are the present therapy strategies for primary IgA nephropathy in adults. Until now, there is insufficient evidence for the additional use of some of the above drugs. In this review, we focus on the treatment in primary IgA nephropathy.

ACEI or ARB Drugs

The most common mechanism of deterioration of renal function is caused by glomerular hypertension and hyperfiltration that arise from a reduction in the remaining normal, uninjured nephron by glomerular obsolescence [2]. Proteinuria and hypertension are two of the strongest predictors of outcome in IgAN, which can be treated by renin–angiotensin–aldosterone system inhibitors (RASIs), such as Angiotensin-Converting Enzyme Inhibitors (ACEIs) and Angiotensin Receptor Blockers (ARBs) to suppress glomerular hypertension and hyper filtration (Table 1). The KDIGO 2012 recommends long term ACEI or ARB treatment when proteinuria is >0.5 g/d [3]. The dosage of the drug depends on the blood pressure and proteinuria level. An RCT that lasted 6 years included 207 patients suggested that high-dose ARB therapy is possibility of recovery of renal function on long-term high-dose therapy compared with normal dose ARB and ACEI [4]. Another retrospective study in Japan suggested that ACEIs or ARBs were effective for long-term renal survival of advanced IgAN (eGFR< 60 ml/min), although proteinuria and blood pressure did not decrease [5]. But a recent RCT which used ramipril 2.5 mg daily to treat IgAN patients with proteinuria <0.5 g/d followed for 5 years indicated that compared with no treatment, ACEI therapy did not offer any benefit in these patients [6]. Commonly, no recommendation on the use of the combination therapy ACEI plus ARB is possible in IgAN patients. But a meta-analysis included 6 RCTs showed that combination therapy ACEI plus ARB may provide more benefits to IgAN patients for reducing daily proteinuria [7]. In our opinion, these RCTs did not have a large sample and a long follow-up, the risk of hyperkalemia also should be put into grave concern, so the long-term effects of these agents on renal outcomes, and safety needed to be established.

Published time Research type Research object Follow-up time Treatment Outcome
2009 [4] Prospective cohort study 207 patients with IgAN 6 years High-dose losartan (200 mg/d), normal- dose (100 mg/d), normal–dose enalapril (20 mg/d) and low-dose (10 mg/d) Patients on high-dose ARB had significantly higher eGFR (p<0.0005) and lower proteinuria (p<0.005)
2011 [5] Retrospective cohort study 66 IgAN patients with an eGFR<60ml/min 2-17 years ACEI group (n=20), ARB group (n=23), Control group (n=23, treated with antiplatelet agents) Renal survival rate was significantly higher in the ACEI or ARB groups than in the control group
2012 [8] Retrospective cohort study 63 IgAN patients with an eGFR of <60 ml/min and proteinuria ≥ 0.5 g/d 2-24 years RASI alone group (n=33); Combination group (n=30 treated with steroids and RASIs) Renal function, the amount of proteinuria, and histological backgrounds were not significantly different
2012 [7] Meta-analysis 6 RCTs of combination therapy with ACEI plus ARB (109 patients) Not known Combined treatment with ACEI plus ARB VS treatment with ACEI/ARB alone Combined treatment was more effective than ACEI/ARB alone for reducing daily proteinuria
2013 [6] Prospective cohort study 60 patients with IgAN, proteinuria < 0.5 g/d, normal blood pressure and renal function 5 years Ramipril 2.5 mg daily or no treatment Ramipril group does not offer any benefit by evaluating proteinuria, eGFR and hypertension

Table 1: The studies of IgAN treatment with RASIs.

Corticosteroids

The other important mechanism of deterioration of renal function is caused by which aberrantly glycosylated serum IgA1 causes mesangial IgA deposition and inflammatory changes, such as crescent formation and endothelial hyper cellularity in the glomeruli [2]. This can be treated by steroid therapy to suppress inflammatory changes in the glomeruli and interstitium [8] (Table 2). IgAN Patients with persistent proteinuria ≥ 1g/d, despite optimized supportive care, should be given a 6-month course of corticosteroids if GFR is above 50 ml/min. Compared with support therapy alone, steroid therapy for six months provided additional benefits in preventing the progression of renal disease [9-11]. The steroid therapy consists of two strategies, pulse plus oral steroids and oral steroids only. The effect of two strategies appears to be equal. The risk for adverse events increases in IgAN patients with steroid therapy, so the safety needs high-quality trial with a large sample size [12]. Strictly alternating or low-dose corticosteroid therapy is ineffective [13].

Published time Research type Research object Follow-up time Treatment Outcome
1999 [9] Prospective  cohort study 86 IgAN; urine protein 1.0 - 3.5 g/d,  SCr ≤133 μmol/L (1.5 mg/dL) 5 years Supportive therapy alone or steroid treatment (IV MP 1 gX3 d at the beginning of months 1, 3, and 5, plus oral prednisone 0.5 mg/kg on alternate days for 6 months 20.9% in the steroid group and 32.6% in the control group reached the primary endpoint* (p<0.048)
2008 [14] Retrospective cohort study 702 IgAN patients Median 5.1 years Oral steroids (n=194), MP pulse therapy followed by oral prednisolone (n=34), 474 patients with no steroid Steroid pulse therapy significantly decreased the risk of ESRF while oral steroid treatment did not improve renal survival
2009 [10] Prospective  cohort study 63 IgAN patients with proteinuria of 1 to 5 g/d. 4 years Cilazapril alone (ACEI group; n=30) or steroid plus cilazapril (combination group; n=33) 24.1% in the ACEI group and 3% in the combination group reached the primary end point*. Urine protein excretion significantly decreased in patients in the combination group
2009 [11] Prospective  cohort study 97 IgAN patients with moderate histologic lesions, proteinuria ≥1.0 g/d; GFR≥50 ml/min 8 years 6-month course of oral prednisone plus ramipril (combination therapy group) or ramipril alone (monotherapy group) 26.5% in the monotherapy group reached the primary outcome** compared with 4.2% in the combination therapy group. The combined treatment reduced 24-h proteinuria more than ramipril alone during the first 2 years
2012 [15] observational study 22 active IgAN (median histological Grade 3) patients with CKD Stage 3 - 5; median eGFR  34.05 ml/min Not known Treated with 500 mg intravenous MP every 2 weeks for 6 months. All patients had been maintained on an ACEI or ARB 73% had improvements in the monthly decline of eGFR.  The rate of eGFR decline in the before treatment period differed significantly from that in the after treatment period

Table 2: The studies of IgAN treatment with corticosteroids.

Immunosuppressive Agents

The treatment of primary IgA nephropathy also includes a series of immunosuppressant therapy (Table 3). A clinical trial which included 40 Chinese IgAN patients with a follow-up of 6 years showed that MMF treatment may result in transient and partial remission of proteinuria in the short-term and Reno protection in the long-term [14-16]. But an earlier United States trial found no effect on proteinuria [17]. At present, it appears prudent to largely restrict the use of MMF to patients of Asian origin who fail to respond to supportive therapy and/or corticosteroids or in whom the use of steroids is problematic because of comorbidities or side effects. If MMF is used in IgAN patients with a reduced GFR, pneumocystis carinii prophylaxis is important, given several deaths in Chinese IgAN patients on MMF [18]. No recommendation on the use of steroid combined with immunosuppressive therapy is possible in IgAN patients, although a few clinical trials indicate that steroid combined with MMF or azathioprine may have a better response to prevent subsequent progression toward renal failure [19,20]. In 2010, Pozzi et al. published a randomized controlled trial in which 207 IgAN patients with a serum creatinine below 2 mg/dl and a proteinuria above 1 g/d, despite RAS blockade, were assigned to receive corticosteroids or additional oral azathioprine. Outcome after a median of 4.9 years was not different between the two groups [21]. In a recent study sirolimus showed a benefit in reducing glomerular proliferative lesions in patients with poor prognosis IgAN [22]. For the refractory IgAN patients, Tacrolimus also showed a rapid proteinuria remission1. But these promising results should be confirmed in larger RCT clinical trials [23].

Published time Research type Research object Follow-up time Treatment Outcome
2005 [17] Prospective  cohort study 32 North American IgAN patients with an eGFR<60 ml/min 2 years 1 year of MMF, titrated up to a dose of 1000 mg bid, or placebo. All patients received RASIs medication 29.4% in the MMF group and 13.3% in the control group reached a 50% increase in SCr (P=0.4). 17.6% in the MMF group and 13.3% in the control group had a 50% reduction in 24 h  proteinuria
2010 [21] Prospective  cohort study 207 IgAN patients with creatinine ≤ 2.0 mg/dl and proteinuria ≥ 1.0 g/d median follow-up of 4.9 years A 3-day pulse of MP in months 1, 3, and 5 in addition to both oral prednisone 0.5 mg/kg every other day and azathioprine 1.5 mg/kg per day for 6 months (n=101). steroids alone on the same schedule (n=106) Low-dose azathioprine to corticosteroids for 6 months does not provide additional benefit to patients with IgAN and may increase the risk for adverse events
2010 [16] Prospective  cohort study 40 Chinese patients with IgA nephritis 6 years All patients were maintained on  ARB medication and half were randomized to receive MMF for 6 m 1.5% in the MMF group and 5% in the control group reached the composite end point*. Urinary protein excretion and the albumin-to-creatinine ratio were lower with MMF treatment during the first 24 m
2011 [19] Prospective  cohort study 22 IgAN patients with  eGFR ≥ 30 ml/min, urine protein ≥ 1 g/d, BP < 130/80 mmHg Not known Methylprednisolone alone or MP combination with azathioprine for 12 months. All the patients were treated with RASIs and PFA for at least 6 m Two groups seem to be effective in reducing the severity of proteinuria and stabilizing renal function.
2011 [22] Prospective  cohort study 23 IgAN patients with a GFR within 30–60 ml/min and/or proteinuria >1 g/d 1 year Low-dose sirolimus plus enalapril and atorvastatin (SRL group, n=14) or enalapril plus atorvastatin (CONTROL group, n=9) Primary end point** improved significantly in the SRL group at 12 months. Proteinuria decreased similarly in both study groups
2012 [23] Prospective  cohort study 14 refractory IgAN patients Not known Tacrolimus (0.05-0.1 mg/kg/d) and prednisone (0.5 mg/kg/d) for at least 6 m 9 patients showed complete or partial remission and 7 patients achieved remission within 1 m

Table 3: The studies of IgAN treatment with immunosuppressive agents.

Antithrombotic Agents

Antithrombotic agents have been widely used in the management of IgAN in Chinese and Japanese populations. A meta-analysis suggested that dipyridamole had statistically significant effects on the reduction of proteinuria but not on the protection of renal function in patients with IgAN. Urokinase had statistically significant effects both on the reduction of proteinuria and on protecting renal function [24]. At present, no recommendation on the use of such drugs is possible in IgAN patients.

Other Treatments

The benefit of fish oil therapy in patients with IgAN has been controversial. Long-term follow-up of the largest randomized trial so far noted a better preservation of renal function in the fish oil group [25]. A small Japanese clinical trial in the IgAN patients showed a significant improvement in estimated creatinine clearance in fish oil group (1.8 g/d for 12 months), but not in the control group. No side effects were noted. All the patients were treated by the assessment based on the Japanese Society of Nephrology classification system for IgA nephropathy. This trial indicated that fish oil therapy was a safe and worthwhile supplement to the drugs used to treat IgAN [26]. In contrast, a meta-analysis which included five RCTs (239 patients) suggested that there were insufficient data to confirm the efficacy of fish oil therapy for proteinuria and renal function in IgA nephropathy [27]. Further large scale trials are needed to shed more light on this issue.

Several studies in Japan reported that Tonsillectomy was associated with a favorable renal outcome of IgA nephropathy in terms of clinical remission and delayed renal deterioration even in non-steroid-treated patients [28,29]. A retrospective study showed that tonsillectomy and steroid-pulse (TSP) therapy increased the probability of CR compared with tonsillectomy alone in IgAN patients with urinary abnormalities [30]. However, no recommendation on the use of tonsillectomy is possible in IgAN patients.

Therapeutics Strategy

Here we will review the available treatments from the perspective of each clinical presentation encountered in IgAN.

For the IgAN patients with isolated microscopic hematuria and little or no proteinuria (<0.5 g/d), no specific treatment is required if they have normal GFR and no hypertension, although patients should receive a follow-up at least for 10 years.

For the IgAN patients with proteinuria more than 0.5-1 g/d, supportive treatment for 3-6 months should be received no matter whether they have decreased GFR or hypertension. During follow-up, to the patients with a GFR level of more than 50 ml/min, combined with corticosteroid therapy may be considered if the level of proteinuria persists for more than 1 g/d.

Acute kidney injury often occurs with macroscopic hematuria. Renal biopsy should be given because that will distinguish acute kidney injury between acute tubular necrosis and crescentic IgAN. Acute tubular necrosis would be self-limiting with continuing supportive treatment while the crescentic IgAN needs high-dose corticosteroids and cyclophosphamide combined with support treatment, and in some cases, using plasma exchange.

For the patients with nephrotic syndrome, IgAN with minimal change nephropathy should be treated similar to the minimal-change disease. There are few RCTs about the treatment strategies of other types of IgAN with nephrotic syndrome. But one point is important, that is the indiscriminate use of corticosteroid should be discouraged.

Conclusions

There still remain many problems in treatment of IgAN to resolve, such as the efficacy and safety of corticosteroid, the use of immunosuppressive agents, the treatment strategies in patients with nephrotic syndrome and so on. Now the ongoing TESTING Study, sponsored by The George Institute and collaborated by Peking University First Hospital, will evaluate the long-term efficacy and safety of oral methylprednisolone on a background of routine RAS inhibitor therapy, in preventing kidney events in patients with IgA nephropathy and features suggesting a high risk of progression. But still other large RCTs are needed for the development of treatment in the primary IgAN.

References

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