Abstract
Background
The association between sarcoidosis and glomerular diseases has not been extensively investigated in a large series and the potential features of this uncommon association remain to be determined.
Methods
We retrospectively identified 26 patients with biopsy-proven glomerular lesions that occurred in a sarcoidosis context. Potential remission of glomerular disease and sarcoidosis under specific treatment (steroid and/or immunosuppressive agents) was recorded for all patients. Demographic, clinical and biological characteristics were assessed at the time of kidney biopsy for each patient. Therapeutic data were analyzed for all patients.
Results
Glomerular disease occurred after the diagnosis of sarcoidosis in 11 of 26 cases (42%) (mean delay of 9.7 years). In six patients (23%), the glomerulopathy preceded the sarcoidosis diagnosis (mean delay 8 years). In the last nine patients (35%), both conditions occurred simultaneously. The most frequent glomerular disease occurring in sarcoidosis patients was membranous nephropathy in eleven cases. Other glomerular lesions included IgA nephropathy in six cases, focal segmental glomerulosclerosis in four patients, minimal change nephrotic syndrome for three patients and proliferative lupus nephritis in two patients. Granulomatous interstitial nephritis was associated with glomerular disease in six patients and was exclusively found in patients in whom the both disease occurred simultaneously. In nine patients with simultaneous glomerular and sarcoidosis diseases, we observed a strong dissociation between glomerular disease and sarcoidosis in terms of steroid responsiveness. At the end of the follow-up (mean of 8.4 years), six patients had reached end-stage renal disease and three patients had died.
Conclusions
A wide spectrum of glomerular lesions is associated with sarcoidosis. The close temporal relationship observed in some patients suggests common causative molecular mechanisms of glomerular injury but complete remission of both diseases in response to exclusive steroid therapy is infrequent.
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Background
Sarcoidosis is a chronic multisystemic inflammatory disease of unknown origin, characterized by the presence of non-caseating, epitheliod granulomas in some tissues leading to organ dysfunction [1, 2]. Sarcoidosis typically affects young adults and its clinical course ranges from spontaneous resolution to chronic progressive disease. The severity and diversity of the clinical manifestations related to sarcoidosis depend on the extent of the infiltrating granulomatous lesions, which preferentially involve the lower respiratory tract. Granulomatous lesions can also affect extrapulmonary sites, such as the lymph nodes, heart, kidneys, central nervous system, liver, spleen, larynx and eyes [2, 3]. Pathophysiological mechanisms involved in the formation, maintenance or spontaneous resolution of sarcoidosis granuloma thought to be linked to genetic susceptibility and to unidentified environmental antigens which trigger an uncontrolled cell-mediated immune reaction involving macrophages and CD4 type 1 helper T (Th1) cells [2, 4, 5].
The prevalence of kidney impairment in sarcoidosis patients ranges from 10% to 20% of cases [6]. Renal injury is most commonly due to disorders in calcium homeostasis, with renal stone disease and nephrocalcinosis [6]. Granulomatous tubulointerstitial nephritis (GTIN) is a less common cause of renal lesions that occurs in approximately 20% of patients with sarcoidosis [7], and benefits from steroid therapy [8, 9]. By contrast, glomerular diseases have been rarely reported in patients with sarcoidosis [6]. Most publications reporting glomerular diseases in the context of sarcoidosis consisted exclusively in case reports. The nature of glomerular lesions seems to be diverse, with membranous nephropathy (MN) [10–14]; minimal change nephrotic syndrome (MCNS) [15–17]; focal segmental glomerulosclerosis (FSGS) [18–20], imunoglobulin A nephropathy (IgAN) [21–24] and proliferative glomerulonephritis [13, 25, 26].
To our knowledge no extensive study has been performed to describe the spectrum of glomerular diseases that occurs in the context of sarcoidosis. In this study, we retrospectively identified 26 patients with biopsy-proven glomerular disease and sarcoidosis and further analyzed the clinical, histological, laboratory, and therapeutic data of these patients to assess the significance of this rare association.
Methods
Patients
Twenty-six patients suffering from both sarcoidosis and glomerular disease were retrospectively identified and followed between 1977 and 2012 in the Nephrology Departments of seven French hospitals (Henri Mondor Hospital, Necker Hospital, Valenciennes Hospital, Tenon Hospital, La Louvière Hospital, Amiens Hospital, Bichat Hospital). We conducted this retrospective study by sending a questionnaire to all nephrology departments involved in the management of glomerular diseases to determine if some patients exhibited glomerular involvement in the context of sarcoidosis occurrence. In each hospital, patients were identified by computing of the renal pathology and clinical diagnosis databases. All patients underwent a renal biopsy for the exploration of proteinuria and/or renal impairment. Demographic, clinical and laboratory data were assessed for each patient at the time of kidney biopsy. Glomerular kidney disease was considered as occurring simultaneously with sarcoidosis when the delay between the diagnoses of both diseases was less than three months. Follow up data (at least six months after kidney biopsy) were obtained for all patients.
Sarcoidosis diagnosis
Sarcoidosis was diagnosed according to the statement of the American Thoracic Society, the European Respiratory Society and the World Association of Sarcoidosis [27]. Its diagnosis was supported by a body of evidence including, clinical, biological, radiographic findings and/or histological evidence of non-caseating granulomas on tissue biopsy [1, 2, 5]. The number of affected organs was systematically reviewed for all patients. In patients with lung involvement, the four-stage radiographic classification of sarcoidosis was used to determine the severity of the pulmonary lesions associated with sarcoidosis: stage 1 for bilateral hilar lymphadenopathy; stage 2 for pulmonary infiltrates associated with intrathoracic adenopathies; stage 3 for isolated parenchymal infiltration without fibrosis; and stage 4 consisted of pulmonary fibrosis [28]. Sarcoidosis therapy, including steroid and/or immunosuppreseive agents use was recorded for all patients.
Glomerular disease diagnosis
Chronic kidney disease was defined as a permanently (lasting at least three months) decrease of estimated glomerular filtration rate (eGFR) of less than 60 ml/min/1.73 m2 according to the modification of diet in renal disease (MDRD) formula [29]. Proteinuria was defined as an albumin excretion rate of > 0.3 g/d. Nephrotic syndrome was defined by urinary protein excretion rates of more than 3 g/d and serum albumin excretion rates below 30 g/L.
Diagnosis of MCNS included the presence of minimal change glomerular lesions and the absence of immunoglobulin and/or complement deposits [30]. FSGS lesions were identified by the presence of segmentally collapsed glomerular capillaries with areas of glomerular scarring associated with focal and segmental granular deposition of IgM and C3 within the segmental glomerular scleroses [31]. MN was characterized granular subepithelial deposition of immunoglobulins and complement along the basement membrane in IF study [32]. Diagnosis of IgAN consisted of the presence of IgA-dominant or codominant immune deposits within the mesangium [33]. Patients who fulfilled the 1997 American College of Rheumatology revised criteria for systemic lupus erythematosus (SLE) with documented sarcoidois were also included in this study [34]. In these cases, renal pathological lesions of SLE were analyzed according to the 2003 International Society of Nephrology and Renal Pathology Society (ISN/RPS) classification [35].
For patients with a diagnosis of MN, MCNS or FSGS, a proteinuria level of less than 0.3 g/d at the six-month follow-up defined a complete remission. Patients with a proteinuria level between 0.3 and 3 g/d and those whom with at least 50% reduction in the level of proteinuria, with an albumin level of > 30 g/L were considered to be in partial remission. IgAN and lupus nephritis were considered to be in remission when the proteinuria level decreased (of more than 50% of initial proteinuria level) with the stabilization or improvement of GFR. Specific treatment of glomerular disease (steroid and/or immunosuppressive treatment) was recorded for all patients.
Results
Clinical and biological data of patients with glomerular disease and sarcoidosis
Twenty-six patients (18 men and 8 women) were retrospectively identified. Their demographic, clinical and biological data are summarized in Table 1. The mean ages at the onset of the sarcoidosis and glomerular disease diagnosis were 37 years (range of 19–56 years) and 39 years (range of six months-59 years), respectively. In 22 patients, the diagnosis of sarcoidosis was confirmed by organ or tissue biopsy. Pathological confirmation of the sarcoidosis diagnoses was based on lung biopsy (nine cases), skin biopsy (three cases), lymph node biopsy (seven cases), muscle biopsy (one case), peritoneal biopsy (one case), and salivary glands biopsy (one case). In four patients, the diagnosis of sarcoidosis was based only on compatible clinical, biological and radiographic presentations [27].
Chest radiographs confirmed the stages of the sarcoidosis thoracic involvement in 22 patients: nine patients had stage 1, ten patients had stage 2 and three patients had stage 3. Extrathoracic localization (other than GTIN) was present in 22 patients. The mean number of organs affected by sarcoidosis was estimated to be 2.6.
Sarcoidosis was considered to be an indolent disease, not requiring specific curative treatment in nine patients (34%). One patient received exclusively topical steroid therapy for localized uveitis. Sixteen patients (61%) received systemic steroid therapy to control active, life-threatening sarcoidosis. In eight patients, steroid therapy led to complete remission of granulomatous disease. Among the eight remaining patients, three developed steroid-dependent sarcoidosis, which required prolonged therapy, whereas five patients displayed steroid-resistant sarcoidosis, which required immunosuppressive therapy consisting of Azathioprine (two cases) or Plaquenil (three cases).
Glomerular disease was diagnosed after sarcoidosis in 11 cases (42%) with a mean delay of 9.7 years (range ten months to 20 years) between the two diagnoses (Table 1). Sarcoidosis was considered to be in complete remission at the time of renal biopsy in six of these patients, whereas it was either: indolent and not treated in three patients; resistant to steroid therapy in one patient; and steroid-dependent in one patient. In six patients (23%), the glomerulopathy preceded the diagnosis of sarcoidosis, with an average delay of eight years (range from six months to 25 years) between the two diagnoses. Nine patients (35%) simultaneously displayed glomerular disease and sarcoidosis (Table 2). All of these patients (except patient 2 [pt2]) received exclusive steroid therapy to treat both conditions, regardless of the type of glomerular lesions. With this therapeutic management, sarcoidosis was considered to be in complete remission in four cases (pt5, pt7, pt8 and pt9). In these patients, effective treatment of sarcoidosis was associated with complete remission of glomerular disease in only one case (pt7) and with partial remission in three cases (pt5, pt8 and pt9). In three other patients (pt1, pt3 and pt6), steroid therapy led to complete remission of glomerular disease but failed to induce remission of sarcoidosis. In one patient (pt4), steroids failed to induce remission of either glomerular disease or sarcoidosis.
The spectrum of glomerular lesions associated with sarcoidosis consisted of MN in eleven patients (42%), IgA nephropathy in six cases (23%), FSGS in four patients (15%), MCNS for three patients (12%) and proliferative lupus nephritis in two patients (8%). As showed in Figure 1, MN seems to be more common in the context of sarcoidosis than in general population (42% of cases vs 10–15% of glomerular diseases in general population) whereas incidence of other glomerular diseases seems to be quite similar [36, 37]. GTIN was observed in association with glomerular injury in six patients (23%) (Figures 2, 3A, 3B and 4). GTIN was exclusively present in renal biopsy of patients exhibiting concomitantly sarcoidosis and glomerular disease (Table 2). Mean proteinuria level at the onset of renal involvement was estimated to be 5.7 g/d (range of 0.45-20 g/d). Mean GFR at the time of glomerular disease diagnosis was 70.7 mL/min/1.73 m2 (range of 16–133 ml/min per 1.73 m2). Nine patients displayed significant renal impairment (GFR of < 60 ml/min/1.73 m2) at the time of renal biopsy.
Incidence of glomerular diseases associated with sarcoidosis compared to their distribution in general population. A: Italian population, 11795 biopsies with glomerular diseases among 13835 biopsies, from 1987 to 1993. B: American population, 195 biopsies from 1974 to 2003. C: Study population, from 1977 to 2012. MCNS: Minimal change nephrotic syndrome, FSGS: Focal segmental glomerulosclerosis MN: Membranous nephropathy, IgAN: IgA nephropathy.
Granulomatous interstitial nephritis occurring simultaneously with FSGS lesions (pt 3) (Masson’s trichrome staining). A. An interstitial noncaseating epithelioid granuloma associated with lymphocytes. Some tubulitis lesions are noted. B. Typical FSGS lesion as a dense glomerular scar with adhesion (synechia) to Bowman’s capsule surrounded by a halo and visceral epithelial cell hyperplasia.
Membranous nephropathy
In our study, MN was the most frequent glomerular disorder associated with sarcoidosis (42% of cases). Among these cases, one of them has been described previously [14]. In this group, only three patients exhibited glomerular lesions simultaneously with sarcoidosis, whereas MN preceded the onset of sarcoidosis in five patients (mean delay of 4.5 years). In three other patients, MN was diagnosed after sarcoidosis (mean delay of 12.6 years). Mean proteinuria level was 7.4 g/d and the mean GFR at the time of MN diagnosis was estimated to be 79.2 mL/min/1.73 m2. In two patients with simultaneous MN and sarcoidosis (pt1 and 9), the renal biopsy revealed a typical GTIN pattern in association with glomerular injury. In patient 1, steroid therapy induced complete remission of MN, but did not induce remission of sarcoidosis until after Plaquenil treatment was added to steroid therapy (Table 2).
IgA nephropathy
Among the six patients with biopsy-proven IgAN, three of them presented with glomerular disease and sarcoidosis simultaneously. In three other patients, IgAN occurred after sarcoidosis with a mean delay of 6.7 years. The mean proteinuria level at presentation was 5 g/day. The mean GFR of this subgroup of patients was estimated at 60.9 mL/min/1.73 m2. All patients with simultaneous sarcoidosis and IgAN (pt5, pt6 and pt7) received steroid treatment, which led to complete remission of sarcoidosis in two cases (pt 5 and pt7) (Table 2), whereas Azathioprin treatment was required for uncontrolled sarcoidosis in one patient (pt6). Steroid therapy induced complete remission of IgAN in two of these three cases (pt6 and pt7) and partial remission in one case (pt5).
Focal segmental glomerulosclerosis
Four patients exhibited typical FSGS lesions on renal biopsy. Renal function was significantly impaired (mean GFR of 51.2 mL/min/1.73 m2) and the mean proteinuria level was 4.5 g/d. Two patients were diagnosed with FSGS and sarcoidosis simultaneously and two patients developed FSGS after sarcoidosis with delays of 7.3 years and 19.8 years. Typical GTIN lesions were also found in the biopsy of one patient who had simultaneous FSGS and sarcoidosis (pt3). Steroid therapy for this patient (pt3) led to complete remission of proteinuria but did not significantly improve sarcoidosis. In the second patient with simultaneous FSGS and sarcoidosis (pt4), steroid treatment failed to reduce proteinuria or to improve sarcoidosis symptoms. Despite Azathioprin treatment, sarcoidosis remained uncontrolled and the patient progressed to end-stage renal disease 3.7 years after initial presentation.
Minimal change nephrotic syndrome
Three patients exhibited MCNS in the context of sarcoidosis. In one case, both diseases developed simultaneously whereas one patient had MCNS 5 years after sarcoidosis and one acquired it 25 years before the onset of sarcoidosis. Nephrotic syndrome without significant impairment of renal function was present in all patients at the time of renal biopsy (mean GFR: 77.1 ml/min per 1.73 m2). GTIN was associated with MCNS lesions in the patient with concomitant MCNS and sarcoidosis (pt8). In this patient, steroid and mycophenolate mofetyl therapies led to partial remission of the nephrotic syndrome, whereas sarcoidosis was considered to be in complete remission after steroid therapy. The patient who acquired MCNS before sarcoidosis had multiple relapses of nephrotic syndrome and received several lines of immunosuppressive treatment for steroid-dependent MCNS. Unexpectedly, steroid and/or immunosuppressive treatments were not administered at the time sarcoidosis was diagnosed. Re-introduction of steroid therapy led to sarcoidosis remission.
Lupus proliferative glomerulonephritis
Two patients with previous history of steroid-resistant sarcoidosis had biopsy-proven lupus (SLE) glomerulonephritis (class IIIA in one case and IIIA-V in the second case). These patients developed sarcoidosis ten months and seven years, respectively, before the SLE diagnosis. Renal biopsies were performed because of significant proteinuria (1 g/d and 0.45 g/d, respectively) associated with microscopic hematuria. Antinuclear antibodies were not detected at the time sarcoidosis was diagnosed but became evident when the renal manifestations began. Therapy for lupus nephritis consisted of steroid and cyclophosphamide drugs in both cases and led to complete remission in one case, but failed to induce remission of lupus nephritis in the second case.
Long-term clinical follow-up
Steroid and/or cytotoxic therapy was used to treat glomerular disease in 18 of 26 patients. Supportive treatment was initiated in eight patients (five patients with MN, two patients with IgAN and one patient with FSGS). At the end of follow-up (average of 8.4 years), complete remission of glomerular disease was confirmed in nine patients, whereas remission was considered to be partial for eight additional patients. Three other patients displayed significant persistent proteinuria. Six patients developed end-stage renal disease requiring intermittent hemodialysis and three of them underwent kidney transplantation. At the end of the follow-up, the mean GFR after excluding the six patients with end stage renal disease was estimated to be 67.8 mL/min per 1.73 m2 and three patients died.
Discussion
In some sarcoidosis patients, the kidneys may be major sites of inflammation and granuloma formation, which leads to significant renal impairment [7]. In such cases, it is likely that infiltration of activated T cells and macrophages into the interstitium results in granuloma formation and interstitial nephritis. Alternatively, in rare cases of glomerular injury in the context of systemic sarcoidosis, the underlying molecular mechanisms of this association remain unclear. The aim of this retrospective was not to determine the incidence and/or the prevalence of glomerular involvement compared to interstitial nephritis related to sarcoidosis but exclusively to describe the spectrum of glomerular lesions observed in patients with sarcoidosis.
Our study demonstrated that a wide spectrum of glomerular lesions may be found in sarcoidosis patients. As these glomerular lesions do not share common pathophysiological mechanisms, the existence of a direct molecular link between sarcoidosis and glomerular pathology remains uncertain. Nevertheless, the close temporal relationship exhibited by nine patients, strongly suggests that glomerular disease and sarcoidosis may be linked in these patients.
Sarcoidosis is characterized by an infiltration of Th1 cells and macrophages into sites of inflammation and by a dominant expression of Th1 cytokines with low levels of Th2 cytokines [38, 39]. Recent studies showed that sarcoidosis is associated with an expansion of a regulatory T cell subset with antiproliferative activity [40]. Most glomerular diseases found in patients with sarcoidosis are thought to be caused by functional disorders of the immune system. Compelling evidence suggests that primary MCNS and FSGS with relapse also result from perturbations of immune system [41]. Thus, we can postulate that cytokines produced locally by granulomas may contribute to alterations in the glomerular filtration barrier. Indeed, increased production of TNF-alpha by granuloma macrophages and activated T cells has been reported [42]. Experimental observations suggest that TNF-alpha may increase the permeability of the glomerular filtration barrier [43]. In accord with previous observations, we found that MN was the most frequent glomerular disease associated with sarcoidosis [6, 10] and often preceded the sarcoidosis diagnosis. Sex ratio, mean age, and proportion of patients with nephrotic syndrome in patients with MN associated with sarcoidosis seem to be similar to those in previous series of patients with idiopathic membranous nephropathy [44–47]. The molecular link between these two conditions remains unclear since no target antigen or specific antibodies have yet been identified. Circulating immune complexes and hypergammaglobulinemia are a common finding in sarcoidosis patients [27]. Recently, Knehtl et al. described a patient with sarcoidosis and MN associated with anti-phospholipase A2 receptor antibodies (anti-PLA2R), suggesting that primary and secondary MN may share certain pathophysiological processes [14]. Three patients displayed IgAN simultaneously with active sarcoidosis. This close temporal relationship strongly suggests that immune dysregulation in sarcoidosis may lead to IgA deposition in the glomerular mesangium. Indeed, cytokine production may also play a critical role in the production and glycosylation of systemic IgA leading to IgAN [48]. The coexistence of SLE and sarcoidosis seems to be a very rare finding [49] even if a recent study suggests an increase of prevalence of SLE among sarcoidosis patients [50]. Weinberg et al. showed that the presence of anti-DNA antibodies in the serum of sarcoidosis patients did not predict the subsequent development of SLE [51]. We described here two interesting cases of lupus nephritis occurring in steroid-resistant sarcoidosis. In these two patients, we cannot exclude the possibility of a fortuitous association without known pathophysiologic relationship between both conditions. Nevertheless, these two cases emphasize the need to systematically screen sarcoidosis patients with renal impairment for SLE antibodies.
Mahevas et al. have previously reported that GTIN lesions occurred simultaneously with the first clinical manifestations of sarcoidosis in 81% of these cases [8]. In our study, only nine patients (35%) displayed biopsy-proven glomerular disease occurring simultaneously with sarcoidosis. Our study demonstrated that all types of glomerulopathies, except lupus nephritis, may be identified in patients with a first relapse of sarcoidosis. Among 11 patients with sarcoidosis that preceded the diagnosis of glomerular disease, none displayed sarcoidosis relapse at the time of renal biopsy. Nevertheless, three patients had untreated persistent sarcoidosis and two others presented steroid-resistant or steroid-dependent sarcoidosis. These five additional cases suggest that persistent granuloma activity may secondarily promote the development of glomerular disease.
Regardless of the types of glomerular lesions found in kidney biopsies, one major issue from our study was to analyze the response to steroid therapy in patients with glomerular diseases occurring simultaneously with sarcoidosis. A recent survey conducted in 47 patients showed that two criteria (the initial fibrotic score at renal biopsy and the response after one month of steroid therapy) were significantly associated with the renal prognosis of patients with GTIN related to sarcoidosis [8]. In our study, exclusive steroid therapy was administered to eight of the nine patients with simultaneous glomerular disease and sarcoidosis. Complete remission of both diseases occurred in a single case (pt7) whereas partial remission of the glomerulopathy and complete disappearance of sarcoidosis related symptoms occurred in three patients (pt5, pt8 and pt9). Despite steroid treatment, one patient (pt 4) displayed both persistent sarcoidosis and significant proteinuria. Finally, we found that sarcoidosis was frequently resistant to or dependent on steroid treatment (4/8 patients). However, the failure of steroid therapy to control sarcoidosis symptoms did not preclude the remission of glomerular disease in three patients (pt1, pt 3 and pt6). These observations are different from those of existing case reports, in which glomerular disease activity appeared to be influenced by the response of the sarcoidosis to steroid therapy [17, 20, 24, 52]. Altogether, these observations show that the steroid responsiveness of sarcoidosis does not correlate with that of glomerular disease and suggest that both diseases require possibly a more aggressive therapy. Indeed, with a mean follow-up of 101 months, six of the 26 patients (23%) had chronic renal impairment requiring intermittent hemodialysis and/or renal transplantation, although their mean GFRs at the time of renal biopsy were not significantly impaired. In contrast, among patients with isolated GTIN who were followed for a median of 84 months, Rajakariar et al. demonstrated that exclusive steroid treatment may significantly improve GFR [9]. Similar results were found by Mahevas et al., suggesting that glomerular lesions are less steroid-sensitive than interstitial injury [8].
Conclusion
Our study showed that the spectrum of glomerular lesions observed in the context of sarcoidosis is heterogeneous and that only 35% of the patients displayed both diseases simultaneously. For these cases, our study suggests that exclusive steroid therapy is less efficient that previously reported. Therefore, optimal therapeutic management can only be determined after further investigations.
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TS VA designed the study, analyzed and interpreted the data and wrote the manuscript, PL, DS reviewed the data and the paper, DJ, PV, JJB, PR, LM, MH, PG, GC,FV, JV, DD, FW, MM collected, reviewed data and contributed to identify patients who meet inclusion criteria, All authors approved the final version of the manuscript.
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Stehlé, T., Joly, D., Vanhille, P. et al. Clinicopathological study of glomerular diseases associated with sarcoidosis: a multicenter study. Orphanet J Rare Dis 8, 65 (2013). https://doi.org/10.1186/1750-1172-8-65
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DOI: https://doi.org/10.1186/1750-1172-8-65