Predictive biomarkers for cytomegalovirus reactivation before and after immunosuppressive therapy: A single-institution retrospective long-term analysis of patients with drug-induced hypersensitivity syndrome (DiHS)/drug reaction with eosinophilia and systemic syndrome (DRESS).

OBJECTIVES: Cytomegalovirus (CMV) reactivation in patients with severe drug eruption on immunosuppressive therapy often leads to fulminant disease and even mortality, yet there are no biomarkers to accurately predict CMV reactivation either before or after immunosuppressive therapy. We aimed to assess whether patients who develop CMV reactivation (CMV-positive cases) have distinct immunological profiles from CMV-negative cases before and after immunosuppressive therapy. METHODS: We performed serial cytokine/chemokine and regulatory T cells (Tregs) assessments of 45 patients with drug-induced hypersensitivity syndrome (DiHS)/drug reaction with eosinophilia and systemic syndrome (DRESS) during a follow-up period of nearly three years after onset. RESULTS: Elevated IL-8, IL-10, IL-12p40, IL-15, TNF-α, G-CSF, and MIP-1α levels at baseline were associated with later development of CMV reactivation, while after starting treatment, IL-10 and IL-15 levels were associated with the onset of CMV reactivation; the use of corticosteroids obscured the large differences in these cytokines at baseline. CMV-positive cases were found to have normal Tregs frequencies at baseline, while negative cases had elevated frequencies. Higher eotaxin, IL-10, and G-CSF levels and lower IL-12p40 levels at baseline might be used for predicting the development of lethal CMV disease. CONCLUSIONS: The algorithm based on these results showed an accurate association with CMV reactivation.

An unusual clinical presentation of lupus erythematosus tumidus localized on the thigh.

A 44-year-old woman with seronegative polyarthritis presented with a 2-year history of a solitary, bluish-red, oedematous, nonscaly, annular and partially reticulated macule on her right thigh. Histopathological findings revealed perivascular and periadnexal lymphocytic infiltrate in the dermis. Alcian blue and colloidal iron stains highlighted mucinous deposit in the upper and mid dermis. Direct immunofluorescence showed a linear deposit of IgG and C3 along the basement membrane zone. Antinuclear antibody was positive at a titre of 1 : 80, with homogenous and speckled patterns. Except for its unusual localization and lack of photosensitivity, our case had the clinical and histopathological features of lupus erythematosus tumidus. These characteristics were also reminiscent of reticular erythematous mucinosis and erythema annulare centrifugum, both of which are considered to be associated with cutaneous lupus erythematosus (CLE). Hydroxychloroquine 200 mg daily led to improvement of the skin lesion. The unusual clinical presentation of our case emphasizes the heterogeneity of clinical manifestations of CLE.

Lichen amyloidosus as a sweat gland/duct-related disorder: resolution associated with restoration of sweating disturbance.

BACKGROUND: Although a number of pathological processes resulting in amyloid deposition have been described in lichen amyloidosus (LA), no attention has been paid to the involvement of sweat glands/ducts in the pathogenesis of LA. According to recent studies, follicular structures are usually spared in serial histological sections of LA, and deposits of amyloid are likely to be confined to areas that display xerosis, suggesting that decreases in skin wetness by sweating disturbance seem to initiate LA. OBJECTIVES: To investigate whether sweating disturbance could represent an early event that triggers LA, and whether resolution of LA could be induced by restoring the sweating disturbance. METHODS: By using the impression mould technique, which allows an accurate quantification of individual sweat glands/ducts actively delivering sweat, we examined sweat responses to thermal stimulus in LA lesions before and after treatment with a moisturizer. RESULTS: Sweating disturbance was most profoundly detected in the 'hub' structure of the LA papule, and this disturbance due to leakage of sweat could be restored by short-term treatment with a moisturizer, particularly when used under occlusion. CONCLUSIONS: This study was limited by the relatively small sample size. Treatment of LA should be primarily directed at preventing leakage of sweat into the dermis or epidermis and therefore sweat delivery to the skin surface could be made easier.

Semi-mechanistic autoinduction model of midazolam in critically ill patients: population pharmacokinetic analysis.

WHAT IS KNOWN AND OBJECTIVE: Midazolam (MDZ) is commonly used for sedating critically ill patients. The daily dose required for adequate sedation increases in increments over 100 h after administration. The objectives of this study were to characterize the MDZ pharmacokinetics in critically ill patients and to describe the phenomenon of increasing daily dose by means of population pharmacokinetic analysis. METHODS: Data were obtained from 30 patients treated in an intensive care unit. The patients received MDZ intravenously as a combination of bolus and continuous infusion. Serum MDZ concentration was assayed by high-performance liquid chromatography. Population pharmacokinetic analysis was performed using the NONMEM software package. The alteration of clearance unexplained by demographic factors and clinical laboratory data was described as an autoinduction of MDZ clearance using a semi-mechanistic pharmacokinetic-enzyme turnover model. RESULTS AND DISCUSSION: The final population pharmacokinetic model was a one-compartment model estimated by incorporating a semi-mechanistic pharmacokinetic-enzyme turnover model for clearance, taking autoinduction into account. A significant covariate for MDZ clearance was total bilirubin. An increase in total bilirubin indicated a reduction in MDZ clearance. From simulation using the population pharmacokinetic parameters obtained in this study, MDZ clearance increased 2·3 times compared with pre-induced clearance 100 h after the start of 12·5 mg/h continuous infusion. WHAT IS NEW AND CONCLUSION: Autoinduction and total bilirubin were significant predictors of the clearance of MDZ in this population. Step-by-step dosage adjustment using this population pharmacokinetic model may be useful for establishing a MDZ dosage regimen in critically ill patients.

Longitudinal analysis of antibody profiles against plakins in severe drug eruptions: emphasis on correlation with tissue damage in drug-induced hypersensitivity syndrome and drug reaction with eosinophilia and systemic symptoms.

BACKGROUND: The evidence for severe drug eruption as a trigger for autoimmune disease has recently increased. No information is available on how tissue damage in severe drug eruptions can induce autoimmune responses. OBJECTIVES: To investigate whether the generation of autoantibodies (autoAbs) against plakin family proteins could be the cause or result of tissue damage in patients with severe drug eruptions and whether the generation of autoAbs could be prevented by systemic corticosteroids during the acute stage. METHODS: We retrospectively analysed alterations of serum levels of autoAbs against plakin family proteins in patients with Stevens-Johnson syndrome (SJS)/toxic epidermal necrolysis (TEN) and drug-induced hypersensitivity syndrome (DiHS)/drug reaction with eosinophilia and systemic symptoms (DRESS) during the acute stage and long after resolution over a period of more than 10 years. RESULTS: AutoAbs against plakin family proteins were detected in patients with either SJS/TEN or DiHS/DRESS regardless of the epidermal damage in the acute stage, and were sustained even long after resolution in DiHS/DRESS, indicating that those autoAbs are neither the cause nor the consequence of epidermal damage, at least in DiHS/DRESS. Severe liver damage and noncorticosteroid therapy during the early and acute stages of DiHS/DRESS were associated with the subsequent generation of these autoAbs. CONCLUSIONS: These autoAbs are neither necessarily the cause nor the result of epidermal damage in DiHS/DRESS, because the presence of these autoAbs was not restricted to patients with SJS/TEN but was also observed in those with DiHS/DRESS, which is characterized by lack of epidermal damage. Severe liver damage and/or immune responses that could be prevented by corticosteroids in the acute stage of DiHS/DRESS are among the causal factors contributing to the generation of autoimmune responses.

Analysis of the protective effects of a neuronal Cav2.1 calcium channel in brain injury.

We previously reported that rolling Nagoya mice carrying a mutation in the α1 subunit of the Cav2.1 channel protective from ischemia- and kainate-induced neuronal damage. However, the protective effect of this mutation and its relationship to brain injury recovery have not been examined. To examine the relationship between Cav2.1 channel function and brain injury, we induced cryogenic brain damage in homozygous rolling Nagoya (rol/rol), control wild-type (+/+), ω-agatoxin IVA-pretreated +/+ (ω-aga +/+), and ω-agatoxin IVA-post-treated +/+ (ω-aga-post-treated +/+) mice. We measured the lesion area, blood brain-barrier permeability and performed immunohistochemistry and western blot analysis. The lesions of rol/rol and ω-aga +/+ mice were significantly smaller than those observed in +/+ mice at both day 1 and day 7 after injury. Similar results were shown in blood-brain barrier permeability. We observed more reactive astrogliosis in +/+ mice than in rol/rol or ω-aga +/+ mice. rol/rol and ω-aga +/+ mice had fewer degenerating cells due to cryogenic injury than did +/+ mice at both day 1 and day 7. ω-Aga-post-treated +/+ mice 24h after injury were sacrificed on day 7. The lesions were smaller in ω-aga-post-treated +/+ mice than those in vehicle-treated +/+ mice. We also examined phosphorylated p38 (pp38) at the injured site. ω-Aga-post-treated +/+ mouse brain slices showed weak pp38 signal; vehicle-treated +/+ mouse brain slices were pp38-positive. These findings demonstrate that the mutant Cav2.1 channel exerts a protective effect against cryogenic brain injury in rolling Nagoya mice. Our results indicate that inhibitors of the Cav2.1-dependent p38 signaling cascade would be useful as therapeutic agents in the treatment of brain injury.

Epitope analysis of antidesmoglein 1 autoantibodies from patients with pemphigus foliaceus across different activity stages.

BACKGROUND: Pemphigus foliaceus (PF) and pemphigus vulgaris (PV) are closely related, but clinically distinct, autoimmune blistering diseases caused by autoantibodies against desmoglein (Dsg)1 and Dsg3, respectively. Using ethylenediaminetetraacetic acid (EDTA)-treated Dsg3 enzyme-linked immunosorbent assay (ELISA) we have shown that the proportion of anti-Dsg3 antibodies against calcium-dependent epitopes decreased upon shifting to the inactive phase in patients with PV. OBJECTIVES: To analyse the epitope profiles of anti-Dsg1 antibodies across the different activity stages of PF. METHODS: We evaluated five patients with PF who retained high serum levels of anti-Dsg1 antibodies in the inactive phase. Sera were obtained in both the active and inactive phases, and were analysed by EDTA-treated and exfoliative toxin-treated ELISAs. To map the epitopes of anti-Dsg1 antibodies, immunoprecipitation-immunoblotting was performed using a set of Dsg1/Dsg2 domain-swapped molecules. RESULTS: Anti-Dsg1 antibodies against the calcium-dependent epitopes of Dsg1 were the predominant antibodies in both the active and inactive phases. The proportion of anti-Dsg1 antibodies against the calcium-dependent epitopes did not change upon shifting to the inactive phase. The results of immunoprecipitation-immunoblotting showed that most of the anti-Dsg1 antibodies bound to the extracellular domains (EC)1-2 of Dsg1. CONCLUSIONS: In patients with PF, the calcium-dependent epitopes on EC1 and EC2 of Dsg1 contained definitively pathogenic and nonpathogenic epitopes. The disease activity might be differentially controlled by the antibodies between PF and PV depending on the presence or absence of the nonpathogenic epitope.

Survival rates and prognostic factors of Epstein-Barr virus-associated hydroa vacciniforme and hypersensitivity to mosquito bites.

BACKGROUND: Epstein-Barr virus (EBV)-associated T/natural-killer lymphoproliferative disorders form a group of diseases that includes classical and systemic hydroa vacciniforme (HV) and hypersensitivity to mosquito bites (HMB). Patients with systemic HV (sHV) and HMB often have a poor prognosis, although little is known about the prognostic factors. OBJECTIVES: To elucidate the prognostic factors of HV and HMB. METHODS: We studied clinicopathological manifestations, routine laboratory findings, anti-EBV titres, EBV DNA load and EBV-encoded gene expression, including expression of BZLF1, in 50 patients with classical HV (cHV), sHV, HMB only and HMB with HV (HMB + HV), and further analysed 30 patients who were available for follow-up. RESULTS: The median age of disease onset was 5 years (range 1-74). A follow-up study indicated that fatal outcomes were observed in three of eight patients with sHV, two of six patients with HMB only, and two of five patients with HMB + HV. The main causes of death were complications from haematopoietic stem-cell transplantation and multiorgan failure. There were no fatalities among the 11 patients with cHV. Univariate analysis revealed two poor prognostic indicators: (i) onset age > 9 years and (ii) the expression of an EBV-encoded immediate-early gene transcript, BZLF1 mRNA, in the skin lesions (P < 0·001 and P = 0·003, respectively). CONCLUSIONS: No prognostic correlation was observed in EBV-infected lymphocyte subsets, anti-EBV antibody titres or EBV DNA load. Late onset and EBV reactivation are both related to more severe phenotypes of the disease, and thus may predict a poor prognosis.

Markedly improved outcomes and acceptable toxicity in adolescents and young adults with acute lymphoblastic leukemia following treatment with a pediatric protocol: a phase II study by the Japan Adult Leukemia Study Group.

The superiority of the pediatric protocol for adolescents with acute lymphoblastic leukemia (ALL) has already been demonstrated, however, its efficacy in young adults remains unclear. The ALL202-U protocol was conducted to examine the efficacy and feasibility of a pediatric protocol in adolescents and young adults (AYAs) with BCR-ABL-negative ALL. Patients aged 15-24 years (n=139) were treated with the same protocol used for pediatric B-ALL. The primary objective of this study was to assess the disease-free survival (DFS) rate and its secondary aims were to assess toxicity, the complete remission (CR) rate and the overall survival (OS) rate. The CR rate was 94%. The 5-year DFS and OS rates were 67% (95% confidence interval (CI) 58-75%) and 73% (95% CI 64-80%), respectively. Severe adverse events were observed at a frequency that was similar to or lower than that in children treated with the same protocol. Only insufficient maintenance therapy significantly worsened the DFS (hazard ratio 5.60, P<0.001). These results indicate that this protocol may be a feasible and highly effective treatment for AYA with BCR-ABL-negative ALL.

A case of synthetic oestrogen-induced autoimmune hepatitis with microvesicular steatosis.

WHAT IS KNOWN AND OBJECTIVE: Drug-induced liver injury (DILI) is a leading cause of acute liver failure in developed countries. Hepatotoxicity is a well-recognized adverse effect associated with synthetic oestrogens, which can cause cholestasis. The current report describes ethinyloestradiol (EE2)-associated highly unusual adverse effects of autoimmune hepatitis (AIH) and microvesicular steatosis (MS). DILI that fulfils the criteria for AIH is referred to as drug-induced autoimmune hepatitis (DIAIH). MS is a potentially severe liver lesion that results from mitochondrial dysfunction. We explore the pathophysiological mechanisms underlying DIAIH and MS. CASE SUMMARY: A 51-year-old woman presented with jaundice, increased liver enzymes and IgG, and positive ANA. She had been taking EE2 for 3 years. Liver biopsy showed prominent interface hepatitis with MS. A drug-lymphocyte stimulation test (DLST) using EE2 was positive. The liver biochemical parameters had normalized after the EE2 discontinuation; however, they exacerbated 5 months post-onset. Repeated liver biopsy showed interface hepatitis with no MS. Considering EE2-induced DIAIH, corticosteroids treatment was initiated. Then, all liver biochemical parameters had normalized, and the corticosteroids were successfully withdrawn. The patient continued to be in complete remission over the next 3 years. WHAT IS NEW AND CONCLUSION: Five remarkable points should be emphasized: (i) a long latency interval, despite the acute presentation; (ii) exacerbation of liver biochemical parameters, even after drug cessation; (iii) the paired liver biopsies indicating continuing inflammation and disappearance of toxic features; (iv) a positive DLST and the absence of fibrosis consistent with DIAIH and not AIH; and (v) a rare histological feature of MS. Intense immunoallergic reactions were likely triggers of MS in the current case. A possibility of DIAIH should be considered in cases of DILI which exhibit overt jaundice, autoantibodies, intense histological inflammation and a long latency period.

Herpes simplex virus reactivation as a trigger of mucous lesions in pemphigus vulgaris.

BACKGROUND: Although infectious agents have long been implicated in the induction or exacerbation of pemphigus vulgaris (PV), a convincing role for the agent in the aetiology of PV has not been established. OBJECTIVES: To establish the association with PV and herpes simplex virus (HSV). PATIENTS AND METHODS: We examined saliva for the presence of HSV DNA after the onset of PV initially localized to the oral lesions in addition to conventional serological tests and immunohistochemistry. RESULTS: We successfully detected high levels of HSV DNA in the saliva samples from six of 16 patients with PV at the earliest stage, who had no episodes of herpes simplex. The prevalence (37·5%) of detecting HSV DNA in the patients with PV was lower than that of eczema herpeticum (56·5%), but comparable to that in patients with herpes labialis (30·0%). Copy numbers of the HSV DNA were rather higher than those with herpes labialis and with eczema herpeticum. In general, detection of HSV DNA in saliva was transient and restricted to the earliest phase of the disease. In addition, anti-HSV immunoglobulin (Ig) G titres in patients with PV were significantly higher than those in patients with virologically confirmed HSV-induced disorders. All salivary HSV DNA-positive patients with PV had run a more complex, intractable course refractory to conventional therapy. CONCLUSIONS: Detection of HSV DNA in saliva is a useful and noninvasive, quantitative method for establishing the role of HSV in the pathogenesis of PV and for identifying individuals at greater risk for subsequently developing refractory PV.

Detection of antibodies against the non-calcium-dependent epitopes of desmoglein 3 in pemphigus vulgaris and their pathogenic significance.

BACKGROUND: Antidesmoglein (anti-Dsg) 3 serum antibody titres are usually correlated with the disease activity of pemphigus vulgaris (PV), but some patients retain high titres even in remission. OBJECTIVES: The aim of our study was to determine whether anti-Dsg3 antibodies in PV sera recognized calcium (Ca(2+) )-dependent or non-Ca(2+) -dependent epitopes, and to evaluate their pathogenicity. METHODS: Dsg3 baculoprotein-coated enzyme-linked immunosorbent assay (ELISA) plates were treated with 0.5 mmol L(-1) ethylenediaminetetraacetic acid (EDTA). The binding ability of anti-Dsg3 monoclonal antibodies (mAbs) was analysed. Eight of the 83 patients with PV who were screened had elevated Dsg3 ELISA index values > 00 in remission. The binding ability of these PV sera was analysed. We evaluated the pathogenicity of anti-Dsg3 serum antibodies against the non-Ca(2+) -dependent epitopes using a dissociation assay. RESULTS: The reactivity of pathogenic anti-Dsg3 mAbs against the Ca(2+) -dependent epitopes diminished markedly in the EDTA-treated ELISA, whereas no such reduction was observed in mAbs against the non-Ca(2+) -dependent epitopes. The sera of all the patients contained antibodies against both Ca(2+) -dependent and non-Ca(2+) -dependent epitopes. In six out of the eight patients, the ratio of antibodies against Ca(2+) -dependent to non-Ca(2+) -dependent epitopes decreased in remission. EDTA-treated Dsg3 baculoproteins adsorbed anti-Dsg3 serum antibodies against the non-Ca(2+) -dependent epitopes, but the remnant PV antibodies retained the ability to induce acantholysis in the dissociation assay. CONCLUSIONS: We have established an assay to measure indirectly the titres of anti-Dsg3 serum antibodies against the Ca(2+) -dependent epitopes, based on the differences between EDTA-untreated and EDTA-treated ELISA index values, as a routine laboratory test to reflect the pathogenic anti-Dsg3 serum antibody titres more accurately.

CD138-negative clonogenic cells are plasma cells but not B cells in some multiple myeloma patients.

Clonogenic multiple myeloma (MM) cells reportedly lacked expression of plasma cell marker CD138. It was also shown that CD19(+) clonotypic B cells can serve as MM progenitor cells in some patients. However, it is unclear whether CD138-negative clonogenic MM plasma cells are identical to clonotypic CD19(+) B cells. We found that in vitro MM colony-forming cells were enriched in CD138(-)CD19(-)CD38(++) plasma cells, while CD19(+) B cells never formed MM colonies in 16 samples examined in this study. We next used the SCID-rab model, which enables engraftment of human MM in vivo. CD138(-)CD19(-)CD38(++) plasma cells engrafted in this model rapidly propagated MM in 3 out of 9 cases, while no engraftment of CD19(+) B cells was detected. In 4 out of 9 cases, CD138(+) plasma cells propagated MM, although more slowly than CD138(-) cells. Finally, we transplanted CD19(+) B cells from 13 MM patients into NOD/SCID IL2Rγc(-/-) mice, but MM did not develop. These results suggest that at least in some MM patients CD138-negative clonogenic cells are plasma cells rather than B cells, and that MM plasma cells including CD138(-) and CD138(+) cells have the potential to propagate MM clones in vivo in the absence of CD19(+) B cells.