POS0768 PRESENCE OF ANTI-Ro/SSA AUTOANTIBODIES, HYPOCOMPLEMENTEMIA AND PHOTOSENSITIVITY INDICATE INDIVIDUALS WITH CONNECTIVE TISSUE DISEASE FEATURES WHO ARE AT INCREASED RISK FOR TRANSITION TO SYSTEMIC LUPUS ERYTHEMATOSUS

Background

Early or pre-clinical forms of lupus encompass a broad range of presentations, spanning from asymptomatic individuals with immunological abnormalities to individuals with autoantibodies and some features suggestive of SLE who do not yet meet the classification criteria. Research on this topic could reveal predictive and diagnostic biomarkers for individuals at-risk for progression to SLE.

Objectives

To examine the rate of transition from at-risk to classified (ACR 1997 criteria) SLE, and identify demographic and clinical predictors. To prospectively evaluate the sensitivity and accuracy of the newer classification criteria (SLICC 2012, EULAR/ACR 2019) and the SLE Risk Predictive Index (SLERPI)[1] in patients at-risk who progress or not to classified SLE.

Methods

This is a single-centre analysis of individuals at-risk for SLE as part of an ongoing multicentric inception cohort study aiming to identify clinical, environmental and molecular prognostic factors for SLE onset. Enrolled individuals: a) were 18–55 years old; b) had clinical and/or serological features suggestive of SLE; c) had no clinical diagnosis of SLE or other autoimmune rheumatic disease; and d) did not fulfill the ACR 1997 classification criteria. Prospective monitoring at 6-month intervals was performed to determine accrual of classification and non-classification features, and ascertain the disease status (at-risk/undifferentiated connective tissue disease, SLE, other connective tissue disease).

Results

A total 124 subjects were included, all Whites, 94.4% women, with an average (standard deviation) age 36 (11) years. At first assessment, individuals fulfilled 2.25 (0.72) ACR 1997 criteria with ANA being the most prevalent feature (75.8%) followed by low complement (43.5%), arthritis (37.9%), photosensitivity (28.2%), malar rash (23.4%), and non-scarring alopecia (18.5%). After a median follow-up of 16 months, 27 participants (21.8%) fulfilled the ACR 1997 criteria, of whom 8 (6.5%) developed moderate or severe SLE. Multivariable-adjusted logistic regression identified anti-Ro/SSA (odds ratio [OR] 6.93; 95% confidence interval [95% CI] 1.75–27.5, p=0.006), combined low C3 and low C4 (OR 4.82; 95% CI 1.42–16.3, p=0.012) and photosensitivity (OR 3.25; 95% CI 1.17–8.99, p=0.023) as independent predictors for transition to classified SLE. The sensitivity of SLICC 2012, EULAR/ACR 2019 and SLERPI (>7) at baseline for detecting individuals who progressed to SLE (ACR 1997) was 40.7%, 25.9% and 40.7%, respectively, with corresponding specificities of 83.5%, 88.7% and 79.4%.

Conclusion

Among individuals at-risk for SLE, about 20% may evolve into classified disease after a medium follow up of 16 months which is predominantly of mild severity. Presence of anti-Ro/SSA, hypocomplementemia, and photosensitivity indicate subjects who at increased risk for transition to SLE. Newer classification systems may capture as many as 40% of progressors with acceptable specificity.

References

[1]doi: 10.1136/annrheumdis-2020-219069

Acknowledgements

This work was funded by the Foundation for Research in Rheumatology (FOREUM).

Disclosure of Interests

None declared

FRI0543 BIRTH REGISTRY OF WOMEN WITH SYSTEMATIC LUPUS ERYTHEMATOSUSAND COURSE OF THE DISEASE DURING FIRST YEARS POST-PARTUM-THE GREEK EXPERIENCE

Background:

Pregnancy in women with SLE Systematic Lupus Erythematosus (SLE) has been related with adverse events both in the mother and the foetus.1Many studies have reported relapse of the disease during the pregnancy and post-labour, while others have not confirmed this finding.2To this end, most of these results originate from retrospective studies with patients of diverge ethnicities.

Objectives:

To record the Greek experience with pregnancies in mothers with SLE and their outcomes, as well as the course of the disease during first year post labor.

Methods:

This is a prospective, multicentre, observation study lasting three years. Women diagnosed with SLE who became pregnant consented to be monitored by their treating Rheumatologist. A structured questionnaire is used for monitoring at the beginning of pregnancy (positive pregnancy test) and at least every 3 months thereafter, depending on the course of the disease and pregnancy, until one year after childbirth.

Results:

A total 64 women and 81 pregnancies were recorded (1.27 pregnancies per patient). Patient’s age at conception was 32.8 ± 5.9 years (mean ± standard deviation). Thirteen patients (20.3%) had past history of nephritis. Regarding pregnancy outcomes, 62 (76.5%) pregnancies ended in live births, miscarriages during 1st, 2ndand 3rdtrimester occurred in 13 (16%). Six pregnancies were lost to followup. Prematurity occurred in 28 live births (45.1% in total), 26-32w (3.2%), 32-36w (22.5%), <37w (19.3%). No cases of preeclampsia occurred. Mean age of birth36.9 weeksand mean birth weight2750gr.The majority (72.5%) of deliveries were performed by caesarean section. In terms of disease activity, most of the women had mild disease at conception, (SLEDAI-2K: 2.67±2.69) that declined during 1st/2ndpregnancy trimester (SLEDAI-2K:1.91±2.09, 1.70±2.22)) but increased during the 1stand 2ndtrimester post labor (SLEDAI-2K: 2.47±4.29 and 2.52±3.2).

Conclusion:

This is the first Greek inception cohort with prospective monitoring of pregnant SLE patients. Adverse outcomes occur with prematurity being the most frequent. In our cohort disease activity tends to increase during 1stand 2ndtrimester post-labor without serious relapses. Vigilant monitoring during pregnancy and post-labour is advised.

References:

[1] Bundhun PK, Soogund MZ, Huang F. Impact of systemic lupus erythematosus on maternal and fetal outcomes following pregnancy: A meta-analysis of studies published between years 2001-2016. J Autoimmun 2017;79:17-27. [https://doi. org/10.1016/j.jaut.2017.02.009] [PMID: 28256367]

[2] Wei S, Lai K, Yang Z, Zeng K. Systemic lupus erythematosus and risk of preterm birth: a systematic review and meta-analysis of observational studies. Lupus 2017;26:563-71. [https://doi. org/10.1177/0961203316686704] [PMID: 28121241]

Acknowledgments:

Hellenic Rheumatology Association

Disclosure of Interests:

Stella Ntali: None declared, Lina Pantazi: None declared, Kyriaki Boki: None declared, Dionysis Nikolopoulos: None declared, Antonis Fanouriakis: None declared, Despoina Dimopoulou: None declared, Ioannis Kallitsakis Grant/research support from: MSD, Speakers bureau: Genesis pharma, Bristol-Myers Squibb, CHARALAMPOS PAPAGORAS: None declared, Vasiliki Dania: None declared, Evgenia Emmanouilidou: None declared, George Bertsias Grant/research support from: GSK, Consultant of: Novartis

Common VDR polymorphisms and idiopathic short stature in children from northern Greece

BACKGROUND

A Vitamin D Receptor gene (VDR) polymorphism, rs10735810 (Fok1), has been associated in the past with idiopathic short stature (ISS) in a linkage study. We have investigated the association of the same, as well as a different polymorphism in the same gene [rs731236 (Taq1)] with ISS, in an independent study in Greek children.

METHODS

The VDR rs10735810 (Fok1) and rs731236 (Taq1) polymorphisms were genotyped in a group of ISS children (n= 47) and an age and sex-matched group of normal height children (n= 60) from northern Greece. Genotyping was accomplished through established PCR-RFLP methods.

RESULTS

An association trend of rs10735810 with ISS was observed, with the TT (ff) genotype being apparently underrepresented among ISS children compared to controls (p= 0.076; OR= 0.165, 95% CI= 0.025-1.094).

CONCLUSIONS

The above results, together with recent evidence related to the functionality of the rs10735810 polymorphism, cannot exclude an involvement of VDR in the pathogenesis of ISS. Hippokratia 2015, 19 (1): 25-29.

Diabese youngsters have 3.7 more chances in developing metabolic syndrome compared with the obese

BACKGROUND AND AIMS

Diabesity, the coexistence of diabetes and obesity, is a new health epidemic. The present case-control study aimed in assessing the prevalence of metabolic syndrome (MS) between diabese and obese children and adolescents.

METHODS AND RESULTS

One-hundred and fifty-four obese children and adolescents aged 4-16 yr were recruited and divided in 2 groups: the diabese (no.=85) who were diagnosed with obesity and impaired glucose tolerance (IGT) and the obese (no.=69), who formed the controls group and did not demonstrate IGT. Von Willebrand factor (vWF), plasminogen activator inhibitor-1 (PAI-1), and uric-acid levels were measured. Being diabese increased the odds ratio (OR) for developing MS (OR: 3.714), demonstrating increased serum triglycerides (TG) (OR: 9.067) and low HDL-cholesterol (HDL-C) (OR: 1.405), developing hypertension (OR: 0.750) and acanthosis nigricans (OR: 2.882). In the total sample, low HDL-C was the most common MS criterion, diagnosed in 68% of the diabese and 62% of the obese subjects. Age and weight-adjustment of the continuous data demonstrated that the diabese subjects had higher fat mass index, blood pressure, and TG levels, however the obese exhibited lower HDLC concentrations. Principal component analysis demonstrated that among the inflammatory biomarkers PAI-1 and vWF contributed to the prevalence of MS.

CONCLUSION

The present study is the first to demonstrate that the diabese youngsters have 3.7 times more chances in developing MS compared with the obese. From the examined atherosclerotic biomarkers, PAI-1 and vWF contributed to the prevalence of the syndrome and both indicate the initiation of endothelial dysfunction.

Gitelman syndrome: first report of genetically established diagnosis in Greece

Gitelman syndrome is an inherited renal tubular disorder characterized by hypokalemic metabolic alkalosis. It is distinguished from other hypokalemic tubulopathies, such as Bartter syndrome, by the presence of both hypomagnesemia and hypocalciuria. We report a case of Gitelman syndrome in a 10-year-old girl who presented for examination of persistent unexplained hypokalemia. She had no severe clinical symptoms but she had typical laboratory findings including hypokalemia, hypomagnesemia and normocalcemic hypocalciuria. Molecular analysis revealed a mutation in the exon 21 of the SLC12A3 gene which encodes the thiazide-sensitive sodium-chloride co-transporter expressed in the distal convoluted tubule (a guanine to adenosine substitution at nucleotide 2538). She was treated with oral potassium and magnesium supplements. This is the first report of genetically established diagnosis in Greece. Gitelman syndrome should be considered as a cause of persistent hypokalemia and genetic analysis might be a useful tool to confirm the diagnosis.

Quality of life of children and adolescents with diabetes of Northern Greek origin

AIM

To culturally adapt the diabetes- specific quality of life (QOL) instrument PedsQL 3.0 Diabetes Module (DM) and the generic QOL instrument PedsQL 4.0 Generic Core Scales (GCS) to the population of Greek diabetic children. Also, to evaluate QOL in youths with type 1 diabetes, compare it with that of healthy youths, and identify relationships between QOL and metabolic control and intensity of treatment.

PATIENTS AND METHODS

Eighty nine (89) children and adolescents with type I diabetes and 89 without diabetes, all with their parents (2-18 years of age, diabetes duration>6 months) completed the Greek GCS. Those with diabetes also completed the Greek DM.

RESULTS

Cronbach alpha coefficient of child and parent report of both instruments, in general approached 0.70, indicating their internal consistency reliability. Both instruments demonstrated positive intercorrelations with their total scores and subscales of DM demonstrated positive intercorrelations with total score of the generic instrument, supporting the validity of both instruments for the evaluation of QOL of Greek diabetic children. No statistically important differences were found among patient and parent report of diabetes and control group in both instruments. Exception was "Social functioning" in which children with diabetes reported better QOL. Growing age, female gender, large BMI, poor metabolic control and intensity of treatment did not influence QOL of children with diabetes.

CONCLUSIONS

Greek PedsQL GCS and DM have sufficient acceptability, reliability and validity so as to be used for the purposes of a comparative study. Youth with diabetes reported similar QOL with non-diabetic youth of the same age and socioeconomic status.

Imaging Ca2+ concentration changes at the secretory vesicle surface with a recombinant targeted cameleon

Regulated exocytosis involves the Ca(2+)-triggered fusion of secretory vesicles with the plasma membrane, by activation of vesicle membrane Ca(2+)-binding proteins [1]. The Ca(2+)-binding sites of these proteins are likely to lie within 30 nm of the vesicle surface, a domain in which changes in Ca2+ concentration cannot be resolved by conventional fluorescence microscopy. A fluorescent indicator for Ca2+ called a yellow 'cameleon' (Ycam2) - comprising a fusion between a cyan-emitting mutant of the green fluorescent protein (GFP), calmodulin, the calmodulin-binding peptide M13 and an enhanced yellow-emitting GFP - which is targetable to specific intracellular locations, has been described [2]. Here, we generated a fusion between phogrin, a protein that is localised to secretory granule membranes [3], and Ycam2 (phogrin-Ycam2) to monitor changes in Ca2+ concentration ([Ca2+]) at the secretory vesicle surface ([Ca2+]gd) through alterations in fluorescence resonance energy transfer (FRET) between the linked cyan and yellow fluorescent proteins (CFP and YFP, respectively) in Ycam2. In both neuroendocrine PC12 and MIN6 pancreatic beta cells, apparent resting values of cytosolic [Ca2+] and [Ca2+](gd) were similar throughout the cell. In MIN6 cells following the activation of Ca2+ influx, the minority of vesicles that were within approximately 1 microm of the plasma membrane underwent increases in [Ca2+](gd) that were significantly greater than those experienced by deeper vesicles, and greater than the apparent cytosolic [Ca2+] change. The ability to image both global and compartmentalised [Ca2+] changes with recombinant targeted cameleons should extend the usefulness of these new Ca2+ probes.

Secretory-granule dynamics visualized in vivo with a phogrin-green fluorescent protein chimaera

To image the behaviour in real time of single secretory granules in neuroendocrine cells we have expressed cDNA encoding a fusion construct between the dense-core secretory-granule-membrane glycoprotein, phogrin (phosphatase on the granule of insulinoma cells), and enhanced green fluorescent protein (EGFP). Expressed in INS-1 beta-cells and pheochromocytoma PC12 cells, the chimaera was localized efficiently (up to 95%) to dense-core secretory granules (diameter 200-1000 nm), identified by co-immunolocalization with anti-(pro-)insulin antibodies in INS-1 cells and dopamine beta-hydroxylase in PC12 cells. Using laser-scanning confocal microscopy and digital image analysis, we have used this chimaera to monitor the effects of secretagogues on the dynamics of secretory granules in single living cells. In unstimulated INS-1 beta-cells, granule movement was confined to oscillatory movement (dithering) with period of oscillation 5-10 s and mean displacement <1 microm. Both elevated glucose concentrations (30 mM), and depolarization of the plasma membrane with K+, provoked large (5-10 microm) saltatory excursions of granules across the cell, which were never observed in cells maintained at low glucose concentration. By contrast, long excursions of granules occurred in PC12 cells without stimulation, and occurred predominantly from the cell body towards the cell periphery and neurite extensions. Purinergic-receptor activation with ATP provoked granule movement towards the membrane of PC12 cells, resulting in the transfer of fluorescence to the plasma membrane consistent with fusion of the granule and diffusion of the chimaera in the plasma membrane. These results illustrate the potential use of phogrin-EGFP chimeras in the study of secretory-granule dynamics, the regulation of granule-cytoskeletal interactions and the trafficking of a granule-specific transmembrane protein during the cycle of exocytosis and endocytosis.