Effect of inflammatory attacks in the classical type hyper-IgD syndrome on immunoglobulin D, cholesterol and parameters of the acute phase response.
BACKGROUND
Classical type hyper-immunoglobulin D (IgD) syndrome (HIDS) is an hereditary auto-inflammatory disorder, characterized by recurrent episodes of fever, lymphadenopathy, abdominal distress and a high serum concentration of IgD. It is caused by mevalonate kinase deficiency.


OBJECTIVE
To further characterize the acute phase response during fever attacks in HIDS in order to improve diagnosis.


METHODS
Twenty-two mevalonate kinase-deficient HIDS patients.


METHODS
Blood samples were drawn during and in between febrile attacks, and concentrations ofC-reactive protein (CRP), ferritin, procalcitonin, pentraxin 3, IgD and cholesterol in several lipoprotein fractions were determined.


RESULTS
The marked acute phase response at the time of a fever attack in classical type HIDS is reflected by a rise in CRP accompanied by a moderate but statistically significant rise in procalcitonin and pentraxin 3. In only two of 22 patients, procalcitonin concentration rose above 2 ng mL(-1) during fever attack, compatible with the noninfectious nature of these attacks. Ferritin does not reach the high concentrations found in adult-onset Still's disease. Despite the defect in mevalonate kinase, a component of cholesterol metabolism, serum cholesterol did not change during attacks. IgD concentration is elevated regardless of disease activity, although there is appreciable variation during life. Its role in HIDS remains unclear.


CONCLUSIONS
The combination of high CRP concentration plus procalcitonin concentration <2 ng mL(-1) in a symptomatic HIDS patient might indicate a febrile attack without (bacterial) infection; this observation warrants further investigation for its usefulness as a marker in clinical practice.
Simon
A
A
Department of General Internal Medicine, University Medical Centre St Radboud, 541 PO Box 9101, 6500 HB Nijmegen, the Netherlands. a.simon@aig.umvn.nl
Bijzet
J
J
Voorbij
H A M
HA
Mantovani
A
A
van der Meer
J W M
JW
Drenth
J P H
JP
D000210:Acute-Phase Reaction; D000293:Adolescent; D000328:Adult; D015415:Biomarkers / Q000097:blood; D002097:C-Reactive Protein / Q000378:metabolism; D002116:Calcitonin / Q000097:blood; D015740:Calcitonin Gene-Related Peptide; D002784:Cholesterol / Q000097:blood*; D010505:Familial Mediterranean Fever / Q000097:blood* / Q000276:immunology / Q000503:physiopathology; D005260:Female; D006801:Humans; D006942:Hypergammaglobulinemia / Q000097:blood* / Q000276:immunology / Q000503:physiopathology; D007072:Immunoglobulin D / Q000097:blood*; D008297:Male; D008875:Middle Aged; D011498:Protein Precursors / Q000097:blood; D000683:Serum Amyloid P-Component / Q000378:metabolism; D000099153:Pentraxins
D015415:Biomarkers; D002097:C-Reactive Protein; D002116:Calcitonin; D015740:Calcitonin Gene-Related Peptide; D002784:Cholesterol; D007072:Immunoglobulin D; D011498:Protein Precursors; D000683:Serum Amyloid P-Component; D000099153:Pentraxins; C000606589:CALCA protein, human