MRI-detected osteitis is not associated with the presence or level of ACPA alone, but with the combined presence of ACPA and RF
© The Author(s). 2016
Received: 13 May 2016
Accepted: 14 July 2016
Published: 2 August 2016
In rheumatoid arthritis (RA) bone marrow edema (BME, osteitis) and anti-citrullinated protein antibodies (ACPA) are associated with radiographic progression. ACPA have been associated with BME, but it is unknown if this association is confined to ACPA and BME. We performed cross-sectional analysis of the association of ACPA, rheumatoid factor (RF) and anti-carbamylated protein (anti-CarP) antibodies with BME and other types of inflammation (synovitis, tenosynovitis) detected by magnetic resonance imaging (MRI).
Disease-modifying antirheumatic drug (DMARD)-naïve patients with early arthritis (n = 589), included in the Leiden Early Arthritis Clinic cohort, underwent contrast-enhanced 1.5 T MRI of unilateral wrist, metacarpophalangeal and metatarsophalangeal-joints at baseline. BME, synovitis and tenosynovitis were scored by two readers. ACPA, rheumatoid factor (RF) and anti-CarP were determined at baseline.
In univariable analyses ACPA-positive patients had higher BME scores than ACPA-negative patients (median 4.5 vs. 2.0, p < 0.001), but not more synovitis and tenosynovitis. Also RF (median 3.75 vs. 2.0, p < 0.001) and anti-CarP antibodies (median 3.5 vs. 2.5, p = 0.012) were associated with higher BME scores. Because the autoantibodies were concomitantly present, analyses were stratified for the presence of different autoantibody combinations. ACPA-positive (ACPA+), RF-negative (RF-), anti-CarP-negative (anti-CarP-) patients did not have higher BME-scores than ACPA-negative (ACPA-), RF-, anti-CarP- patients. However ACPA+, RF-positive (RF+), anti-CarP- patients and ACPA+, RF+, anti-CarP-positive (anti-CarP+) patients had higher BME scores than ACPA-, RF-, anti-CarP- patients (median 5.0 and 4.5 vs. 2.0, p < 0.001 and p < 0.001). ACPA levels were not associated with BME scores. Analyses within RA- and UA-patients revealed similar results.
The presence of ACPA alone or ACPA level was not statistically significantly associated with BME scores, but the combined presence of ACPA and RF was associated with more BME. This suggests an additive role of RF to ACPA in mediating osteitis.
KeywordsRheumatoid arthritis ACPA RF MRI Bone marrow edema
Rheumatoid arthritis (RA) is characterized by chronic inflammation of the joints that may result in progressive structural damage. Magnetic resonance imaging (MRI) detects inflammation sensitively . Whereas synovitis and tenosynovitis can also be evaluated by other imaging modalities, such as ultrasound, MRI is the only modality that depicts bone marrow edema (BME). Histopathology studies in RA have shown that BME lesions consist of infiltration by leucocytes and an increased number of osteoclasts [2–4]. Therefore, BME has also been named osteitis. These data suggest a link between BME and structural damage in RA. Indeed, the importance of BME is supported by several studies showing that BME is a predictor of radiographic evidence of progression [5–13]. A recent study even showed that the persisting presence of BME is associated with an odds ratio (OR) of 60 for erosive progression at the same location .
In addition to BME, anti-citrullinated protein antibodies (ACPA) are also a strong predictor of radiographic progression [15–23]. Up to two-thirds of patients with RA harbor ACPA, as has been known for many years . However, the underlying mechanism linking ACPA with a more severe disease progression with increased joint destruction is incompletely elucidated. Recent data suggest that ACPA influences bone resorption by directly activating osteoclasts . The combination of these findings lead us to hypothesize that ACPA are associated with BME.
Other studies, including a small study that we performed previously suggest there is association between BME and ACPA [26, 27]. However, ACPA are often simultaneously present with other RA-related autoantibodies such as rheumatoid factor (RF) and anti-carbamylated protein antibodies (anti-CarP) (which also have been associated with radiographic destruction) [28–30]. To our knowledge the effects of different autoantibodies (either alone or in combination) on BME are unknown. Furthermore, the association between different autoantibodies and other types of inflammation detected by MRI (synovitis and tenosynovitis) has never been thoroughly explored. Therefore, this cross-sectional study aimed to investigate the associations of ACPA, RF and anti-CarP antibodies with BME, synovitis and tenosynovitis.
Baseline characteristics of the total group of patients with early arthritis and the subgroups of patients with rheumatoid arthritis (RA) or undifferentiated arthritis (UA)
All patients with early arthritis
Subgroup of patients with RA or UA
(n = 589)
(n = 397)
Age, mean (sd)
Female, n (%)
Symptom duration, median (IQR), weeks
TJC, median (IQR)
SJC, median (IQR)
CRP (mg/L), median (IQR)
ACPA positivity, n (%)
RF positivity, n (%)
anti-CarP positivity, n (%)
Total RAMRIS, median (IQR)
Total BME score, median (IQR)
Total synovitis score, median (IQR)
Total tenosynovitis score, median (IQR)
Magnetic resonance imaging and scoring
At baseline, MRI was performed of the metacarpophalangeal (MCP), wrist and metatarsophalangeal (MTP) joints on the most painful side or on the dominant side in the case of symmetric symptoms. MRI was performed using an MSK Extreme 1.5 T extremity MRI system. In the wrist and MCP joints a coronal T1-weighted sequence was acquired before intravenous injection of contrast agent (gadoteric acid). Post-contrast, coronal and axial T1-weighted sequences with frequency-selective fat saturation were obtained. The forefoot was scanned using a T1-weighted sequence and a T2-weighted fat-saturated sequence in the axial plane. The protocol was shortened after 371 patients had been imaged . For post-contrast imaging of the foot in the remaining 218 patients, T1-weighted, fat-saturated sequences were obtained in the coronal and axial plane and the T2-weighted sequence was deleted. A more detailed description of the scan protocol is provided elsewhere [14, 35, 36] and in Additional file 1.
BME and synovitis were scored semi-quantitatively according to the rheumatoid arthritis MRI scoring system (RAMRIS) , with the exception that BME was assessed on a contrast-enhanced T1-weigthed fat-suppressed sequence. Previous studies have shown that T2-weighted fat-saturated sequences and contrast-enhanced T1-weighted fat-saturated images perform equally well in the depiction of BME [34, 38, 39], and according to the European Society of Musculoskeletal Radiology (ESSR), both sequences can be used to evaluate BME . The T1-sequence was used as it allowed a shorter scan time. In addition, tenosynovitis in the wrist and MCP joints was scored according to the method proposed by Haavardsholm et al. , with tenosynovitis assessed for the flexor and extensor tendons of MCP joints 2–5 using the same scale of 0–3 as for the wrist. MR images were scored by two readers blinded to any clinical data. The mean total scores of both readers for BME, synovitis and tenosynovitis were used in further analyses. The intra-reader class correlation coefficients for the total inflammation score based on 40 MR images that were scored twice, were 0.98 and 0.93, respectively. Based on all 598 scans, the inter-reader class correlation coefficient for the total inflammation score was 0.95.
Our primary analyses were performed in all 589 early arthritis patients, as we hypothesized that direct association between autoantibodies and MRI-detected inflammation, if present, would be independent of the clinical diagnosis. However, analyses were repeated in the subgroup of 397 patients classified with UA or RA according to the 1987 American College of Rheumatology (ACR) criteria. Patients who had UA after one year were included in these analyses because misclassification could have occurred due to DMARD treatment during the first year that could have hampered progression to fulfilling the 1987 criteria for RA. As some of these patients with UA would have progressed to RA without treatment (but now remain unclassified), we also studied the patients with UA.
The t test, multivariable linear regression, and multivariable logistic regression were used for analysis as appropriate. In multivariable linear regression analysis, the BME scores were log10-transformed (log10(score + 1)) to approximate a normal distribution. For interpretation, the obtained effect size (beta) was back-transformed to the normal score. All models were adjusted for age, gender and symptom duration. Baseline data on ACPA, RF, and anti-CarP were dichotomized (seropositive vs. seronegative). Anti-CarP data were missing for 16 patients. ACPA and RF status was known for all patients. To determine the effect of ACPA levels on BME, baseline ACPA was categorized into three groups within ACPA-positive patients based on the range of ACPA values (low, intermediate, or high); the thresholds were: ≥7 U/ml, ≥167 U/ml and ≥327 U/ml. P values ≤0.05 were considered significant. Analyses were performed using SPSS version 23.0 (IBM).
Baseline characteristics of the 589 patients are presented in Table 1.
ACPA is associated with BME at baseline
RF and anti-CarP antibodies are also associated with BME
We were also interested in whether RF and anti-CarP antibodies are also associated with more severe BME. The BME scores were higher in RF-positive patients (median = 3.75) compared to RF-negative patients (median = 2.0, p < 0.001, Fig. 1b). Similarly, BME scores were also higher in anti-CarP-positive than in anti-CarP-negative patients (median = 3.5 vs. 2.5, p = 0.012, Fig. 1c).
Besides BME, synovitis and tenosynovitis scores were also higher in RF-positive than in RF-negative patients (synovitis: median 4.5 vs. 3.0, p = 0.001; tenosynovitis: median 3.5 vs. 1.5, p = 0.004). Synovitis and tenosynovitis scores were also higher in anti-CarP-positive than in anti-CarP-negative patients (synovitis: median = 4.75 vs. 3.5, p = 0.021; tenosynovitis: median = 4.25 vs. 1.5, p = 0.013). In patients with RA and UA only the BME scores were significantly higher in RF-positive (RF+) or anti-CarP-positive (anti-CarP+) patients, but synovitis and tenosynovitis scores were not statistically significantly different (BME: RF+ median = 3.5, RF-negative (RF-) median = 2.0, p = 0.002; anti-CarP+ median = 3.5, anti-CarP-negative (anti-CarP-) median = 2.5, p = 0.017, Additional file 2: Figure S1B, C).
Patients can concurrently have BME, synovitis, and tenosynovitis. To unravel the independent association between RF and BME, synovitis, and tenosynovitis scores, multivariable logistic regression analysis was performed with RF as the dependent variable and BME, synovitis, and tenosynovitis as independent variables. The same was done with anti-CarP as the dependent variable. In early arthritis, only the BME score was independently associated with RF (p < 0.001) or with anti-CarP (p = 0.003). Similar results were observed in the subgroup of patients with RA or UA, in whom only BME was associated with RF (p < 0.001) or with anti-CarP (p = 0.001). Thus, these multivariable analyses suggest that the BME score is independently associated with RF or anti-CarP, in contrast to the synovitis and tenosynovitis scores. Because of this result, and because it was observed that there was an association between BME and ACPA, subsequent analyses focused on BME.
ACPA and RF are both independently associated with BME
Patients frequently have a combination of different types of inflammation, and also concomitantly have the three autoantibodies. For more insight into the relationship between the different autoantibodies and BME, multivariable linear regression analysis was performed with BME as the outcome and the three autoantibodies as independent variables. Both ACPA and RF were significantly associated with BME (ACPA: p = 0.015, beta = 1.33, indicating that ACPA-positive (ACPA+) patients had 33 % higher BME scores than ACPA-negative (ACPA-) patients; RF: p = 0.004, beta = 1.31, indicating that RF+ patients had 31 % higher BME scores than RF- patients). Additional adjustments for CRP and SJC produced similar results (ACPA: p = 0.009, beta = 1.36; RF: p = 0.001, beta = 1.36). In a similar analysis in the subgroup of patients with RA and UA, there was a trend towards significance for ACPA (p = 0.091, beta = 1.26) and a significant result for RF (RF: p = 0.022, beta = 1.31). Thus, together these data indicated that ACPA and RF are independently associated with BME scores.
Combined presence of ACPA and RF is associated with BME
ACPA level is not associated with BME
Combined presence of ACPA, RF and anti-CarP is associated with synovitis and tenosynovitis
The relationship between ACPA and other RA-related autoantibodies and BME was subject of this study. We showed that ACPA, RF and anti-CarP antibodies were all associated with BME in univariable analyses. However, when the different autoantibody combinations were compared, the presence of ACPA alone was not associated with BME, but the combined presence of ACPA and RF (with or without anti-CarP) was associated with BME. The level of ACPA was not associated with BME, suggesting that this cannot be explained by ACPA levels but rather by the combined presence of ACPA and RF.
To our knowledge this is the first study including almost 600 MR images in which the relationship between the different autoantibodies and MRI-detected inflammation was investigated in detail. Due to this large sample size it was possible to evaluate the independent associations between BME and ACPA, RF and anti-CarP. Furthermore, it was possible to investigate the differential effects of the autoantibodies on the different types of MRI-detected inflammation. On analyses in subgroups of patients with different autoantibody combinations the BME scores were mainly increased when both ACPA and RF were present.
Our data suggest a potential interaction between RF and ACPA; however, the underlying mechanism by which ACPA and RF could act in concert was not studied. Potentially RF could have an immune-enhancing effect by crosslinking immune complexes and thereby activate monocytes or macrophages and induce cytokine expression. This is supported by a recent study that showed that RF augments TNFα production by ACPA immune complexes in vitro . Another explanation could be that RF has a role in immune complex stabilization. ACPA bind to target antigens with low avidity but it could well be that when RF is also involved in the immune complex this binding is more stable. Further fundamental studies should be performed for more insight into the interaction between these two autoantibodies.
This study investigated local inflammation as observed on MRI. Recently the combined effect of ACPA and RF on systemic inflammation was investigated in RA, showing that the combined presence of ACPA and RF was associated with higher levels of pro-inflammatory cytokines and increased acute phase reactants and disease activity . We also analyzed the association between the different autoantibody combinations and CRP, erythrocyte sedimentation rate (ESR), SJC and 28-joint-count disease activity score (DAS28) as measures of disease activity in our patients with RA or UA at baseline; no large differences were observed but patients positive for all three autoantibodies had the highest disease activity scores (Additional file 5: Figure S4).
Association between the combined presence of autoantibodies and BME was observed. Since BME is associated with erosive progression [5–14], it would be interesting to investigate whether combinations of autoantibodies are also associated with radiographic progression. The association between ACPA or RF and radiographic progression is well-investigated [15–23]. However the number of studies investigating the combined effect of ACPA and RF is limited. A recent study in two cohorts showed no additive effect of RF on radiographic progression in ACPA-positive patients . Another study analyzing high-resolution peripheral quantitative computed tomography (CT) images of the MCP joints in patients with RA showed that there was an additive effect of ACPA and RF on erosion number and size . The read-out of these studies (microCT and conventional radiography) was different. It would be interesting to further unravel the association between different autoantibody combinations and erosive progression in further observational studies.
A limitation of the subgroup analysis is that some autoantibody combinations were infrequent and so no definite conclusions can be drawn for these. For instance, patients who were ACPA+, RF-, anti-CarP- were infrequent. Despite the limited power, there was no tendency in the data towards higher BME scores in these patients compared to the triple-negative group. This study is not the first that did not identify a deleterious effect of the presence of ACPA alone. Two recent papers reported on mice that were injected with ACPA, and although ACPA was detected in the joint, no signs of inflammation were observed in the synovium [46, 47]. Surprisingly, in our data the presence of ACPA alone even had a non-significant tendency towards a protective effect against synovitis (in all patients with early arthritis patients and in patients with RA or UA). Interestingly, two recent studies in humans showed that the presence of ACPA without RF was associated with lower disease activity [42, 43]. In summary, further larger studies are needed to determine the role of ACPA single positivity.
Another limitation could be that we used contrast-enhanced T1-weighted images to assess BME. Using the RAMRIS method, T2-weighted fat-suppressed sequences, or when this sequence is not available, a short tau inversion recovery (STIR) sequence, should be used to assess BME. However, it has been demonstrated that a contrast-enhanced T1-weighted fat-suppressed sequence performed equally well to depict BME as a T2-weighted fat-suppressed sequence [34, 38, 39] and the evaluation of BME on a T1-weighted fat suppressed sequence is also supported by the ESSR . In this study the contrast-enhanced T1-weighted fat-suppressed sequence was used because it allowed a shorter scan time and has a higher signal-to-noise ratio [34, 38].
A third limitation is that the scan protocol for the foot was changed. When the analyses of the different autoantibody combinations and BME scores in patients with early arthritis were repeated separately in the patients scanned with or without the coronal sequence of the foot, the presence of ACPA alone was not associated with higher BME scores, but the combined presence of ACPA and RF was associated with higher BME scores (data not shown). This suggests that the change in scan protocol for the foot had no major influences on the results of this study.
Finally, our arthritis cohort includes patients with early disease who presented with different diagnoses. We hypothesized that direct association between ACPA and MRI-detected inflammation would be independent of the clinical diagnosis. However, to exclude an effect of this heterogeneity in patient selection on our findings we repeated all analyses within the subgroup of patients with RA and UA. This produced similar results.
Of note, the differences observed in BME scores were statistically significant but the absolute differences were relatively small. The variation in BME scores was only partly explained by the autoantibody status. Nonetheless the present study does increase our understanding of the relationship between autoantibodies and BME, which are both predictors of radiographic progression. The observation that ACPA is associated with osteitis, only when RF is present, fuels further laboratory studies on the biological relevance of these autoantibodies.
In conclusion, the presence of ACPA alone and ACPA serum levels were not associated with BME scores. However, BME scores were higher when patients were seropositive for both ACPA and RF. These results suggest that RF has an additive role to ACPA in mediating osteitis.
ACPA, anti-citrullinated protein antibodies; anti-CarP, anti-carbamylated protein antibodies; BME, bone marrow edema; CRP, C-reactive protein; DMARD, disease-modifying-antirheumatic-drug; EAC, Early Arthritis Clinic; ELISA, enzyme-linked immunosorbent assay; ESR, erythrocyte sedimentation rate; ESSR, European Society of Musculoskeletal Radiology; FCS, fetal calf serum; IQR, interquartile range; MCP, metacarpophalangeal; MRI, magnetic resonance imaging; MTP, metatarsophalangeal ; OR, odds ratio; RA, rheumatoid arthritis; RAMRIS, rheumatoid arthritis magnetic resonance imaging scoring system; RF, rheumatoid factor; SD, standard deviation; SJC, swollen joint count; TJC, tender joint count; TNF, tumor necrosis factor; UA, undifferentiated arthritis
This work was supported by the Dutch Arthritis Foundation and the Netherlands Organization for Health Research and Development (Vidi grant). The funding sources had no role in the design and conduct of the study; collection, management, analysis, and interpretation of the data; preparation, review, or approval of the manuscript; or decision to submit the manuscript for publication.
Availability of data and materials
Data can be requested from the corresponding author.
DMB, WPN, and AHMvdHvM contributed to the conception and study design. DMB analyzed the data. DMB, WPN, MKV, MR, REMT, LAT, and AHMvdHvM contributed to interpretation of the data. ECN contributed to acquisition of the data. DMB and AHMvdHvM wrote the first version of the manuscript and DMB, WPN, MKV, ECN, MR, REMT, LAT, and AHMvdHvM revised it critically. DMB, WPN, MKV, ECN, MR, REMT, LAT, and AHMvdHvM read and approved the final manuscript.
The authors declare that they have no competing interests.
Consent for publication
Ethics approval and consent to participate
The study was approved by the medical ethics committee of the Leiden University Medical Center, which is named Commissie Medische Ethiek (CME). All patients signed informed consent.
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