Insulin autoimmune syndrome (Hirata's disease): a case report of Caucasus in new onset diabetes mellitus
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https://www.eduzhai.net Clinical M edicine and Diagnostics 2012, 2(5): 51-53 DOI: 10.5923/j.cmd.20120205.02 Insulin Autoimmune Syndrome (Hirata Disease): Case Report in a Caucasian Patient with New-Onset Diabetes Maurizio Sudano1, Fede rica Turchi1 , Paolo Sossai2,* 1Diabetes and M etabolic Diseases Unit, General Hospital, I – 61029, Urbino, Italy 2Center of Clinical Research, School of M edicinal and Health Products Sciences, University of Camerino, I- 62032, Camerino, Italy Abstract An unusual cause of spontaneous hypoglycemia is Insulin Autoimmune Syndro me (or Hirata Disease), characterized by high levels of insulinemia and circulat ing autoantibodies to insulin in subjects without prior insulin administration. In Western Countries less than 70 cases have been published so far. Here we report a case where IAS was the prodromical stage of new onset type 1 diabetes. HLA typing in IAS was rarely reported in Western cases, here we also discuss the peculiar HLA pattern of our patient. Keywords Hirata Disease, Insulin Autoimmune Syndrome, Autoimmun ity, Hypoglycemia, HLA, Autoantibodies, Insulin, Type 1 Diabetes 1. Introduction Insulin Autoimmune Syndro me (IA S) or Hirata Disease (HD), was first described by Hirata in 1970 and is characterized by spontaneous hypoglycemic episodes, a high titer of insulin autoantibodies and increased levels of immunoreactive insulin in patients not previously treated with insulin or oral hypoglycemic agents. There is a significant genetic p redisposition to IAS as suggested by its association with specific HLA class II alleles, and it is often associated with previous exposure to drugs with a sulfhydryl group in their chemical structures such as methimazole or captopril. The majority of cases are reported in Japan, where IAS is the third leading cause of hypoglycemia (325 patients diagnosed at the end of 2007). The syndrome is rare in Caucasian/non-Japanese populations: 60 cases in Caucasians and 20 cases in East Asians have been reported to date. To the best of our knowledge, the present case is the third reported in Italy (a lthough the subject is not of Italian origin) and the first with HLA typing. 2. Case Report nausea, vomiting or headache. He reported a one-month history with similar recurrent episodes not strictly related to meals. His past medical history was significant only for spinal surgery due to severe spondylolisthesis. He had not previously taken any medications except for short-term therapy with steroids before spinal surgery. He denied any history of alcoholism or drug addiction. On admission the patient appeared alert and oriented to person and time. His vital signs were stable. His Body Mass Index (BMI) was 20.2. His plasmat ic glycemia was 2.94 mmo l/ L (53 mg/dl) and he recovered fully after an intravenous infusion of g lucose. After discharge he suffered fro m hypoglycemic episodes almost every day, occurring both in a fasting state and 2-3 hours after meals. According to the Whipple triad h is symptoms were relieved by intake of food rich in carbohydrates. About five months after discharge, early investigations showed normal fasting glycemia (81 mg/dl, 4.49 mmo l/ L) and insulinemia (3.4 mU/ ml, normal range 1.9-23). He was subsequently referred to us for closer e xa mination. The ora l glucose challenge test (OGTT) was positive for diabetes mellitus, as shown in Table 1, yet glycated hemoglobin was still with in the normal range (5.4%, range. < 6.2). Unlike the previous test, fasting insulinemia was very high (181.1 µU/ ml). A 25-year old Caucasian male originally fro m Eastern Europe (Bulgaria), presented to the Emergency Department of the General Hospital of Urb ino with dizziness, sweating and fine tremors. These symptoms were not accompanied by Time glycemia (mg/dl) Table 1. OGTT 0 min 30 min 60 min 93 249 324 90 min 230 120 min 78 * Corresponding author: firstname.lastname@example.org (Paolo Sossai) Published online at https://www.eduzhai.net Copyright © 2012 Scientific & Academic Publishing. All Rights Reserved An abdominal ultrasonography and Magnetic Resonance Imaging (MRI) were done in order to investigate the possibility of insulino ma, but both tests were negative. We 52 M aurizio Sudano et al.: Insulin Autoimmune Syndrome (Hirata Disease): Case Report in a Caucasian Patient with New-Onset Diabetes decided to perform a s upervised 48h fast test in an attempt to show an inappropriate insulin incretion. Unfortunately, due to a technical error, the test was discontinued after 12 h r, yet the results were significant as shown in table 2. Time 7 am 12 am 4 pm 8 pm 12 pm Table 2. Fast Test Insulinemia (mU/ml) 102.9 78.2 59.6 48.3 38.7 Glycemia (mg/dl) 80 73 77 70 63 C Peptide (ng/dl) 6.3 5.6 10.4 13.1 6.2 Additional tests revealed high levels of antiglutamic acid decarboxylase (GA DA) antibodies (16 IU/ ml normal range <5) and antiinsulin antibodies (IAA, 16.5 IU/ ml, normal range <2.4). On the basis of all tests performed, we diagnosed HD. Since the association of IAS with specific genetic loci is we ll known, we took blood samples for HLA Class II typing. The results are shown in Table 3. Table 3. HLA Class II Typing DRB1*04:03 DQA1*01:03 DQB1*03:02 DRB1*15 DQA1*03:01 DQB1*05 Note: HLA-DRB1*04:06 not present 3. Discussion onset of an insulinoma, hypoglycemic crises occur in fasting state but, with time, patients develop persistent hypoglycaemia. However, we did not found any evidence of tumours fro m M RI o r u ltrasound scan. Besides, as we will discuss herein, fast test was not significant for insulino ma. Table 3. Differential diagnosis for hypoglycemia Dru gs Insulin, sulfonylureas, ethanol, pentamidine, quinine, salicylates, sulfonamides, En dogenous h yperinsulinism Insulinoma Other β cell disorde rs Autoimmune (autoantibodiesto insulin, insulin receptor, β cell?) Ectopic insulin secretion Critical illnesses Hepatic, renal, or cardiac failure Sepsis Starvation and inanition Endocrine deficiencies Hyp op it uit arism Non-β-cell tumours Fibrosarcoma, mesothelioma, rhabdomyosarcoma, liposarcoma,, hepatoma, adrenocorticaltumours, carcinoid, leukemia, lymphoma, melanoma, teratoma Disorders of infancy or childhood Infant s of diabet ic mothers (hyperinsulinism) Persistent hyperinsulinemic hypoglycemia of infancy Inherited enzyme defects Pos tprandi al Reactive (after gastric surgery) Et h ano l-in duced Fa cti tious Insulin, sulfonylureas The patient presented to the Emergency Department with symptoms suggesting recurrent ‘hypoglycemic crisis’. The symptoms of hypoglycemia are classified as neurogenic (adrenergic) or neuroglycopenic. Neurogenic sy mptoms, caused by the stimu lation of sy mpathetic nervous system, include sweating, palpitation, fine tremors, an xiety and hunger. Usually, adrenergic symptoms precede the neuroglycopenic symptoms and can be useful as early warnings for hypoglycaemic patients. Neuroglycopenic symptoms – due to decreased cerebral glucose availability – include confusion, concentration difficult ies, irritability, and focal cerebra l impa irment. The differential d iagnosis for hypoglycemia is quite complex and must take into account several pathological conditions (Table 3). Drugs, includ ing diabetes mellitus-con trolling medicat ions, and alcohol are considered to be the leading causes of hypoglycemia. Other well-known causes of hypoglycemia include endogenous hyperinsulinism, such as insulinoma, crit ical illnesses and endocrine deficiencies. The general condition and routine tests of our patients showed no evidence for coexisting crit ical diseases. High concentrations of C-Peptide were coexisting with raised insulin levels: this finding allowed us to exclude hypoglyca emia fro mself-ad ministered insulin (hypoglycaemia factitia). On the other hand, insulino ma is the most common cause of hypoglycemia due to endogenous hyperinsulinism. At the IAS (or HD) is characterized by the presence of autoantibodies to native insulin (in most cases with a polyclonal pattern), and hypoglycemic crises are held to be caused by the erratic dissociation of insulin-antibody complexes. It has been hypothesized that after a meal the raised plasmat ic glucose concentration evokes the release of insulin, wh ich in most part becomes bound to autoantibodies and thus is not biologically available. As a result, the postprandial hyperglycemia is not adjusted and keep on stimulat ing insulin-secretion. During post-prandial phase, as glycemia declines, the kinetics of the insulin-antibody interaction shifts to favour the d issociation of insulin-antibo dy complexes, resulting in inappropriately high seru m free insulin concentrations in the presence of decreasing glucose concentrations, and consequent hypoglycemia. Despite its well-known genetic background the pathological trigger for IAS has not been elucidated yet. Typically, as in our case, affected patients experience hypoglycemic crises both in the fasting and postprandial state. In IAS, insulin levels are inappropriately high for a given glucose concentration, but unlike insulino ma, are usually suppressed by prolonged fasting. Despite the accidental interruption, the fast test in our patient revealed a clear trend fo r insulin to be reduced after a few hours. The ratio of insulin to glucose is about 1 and increases with fasting in patients with insulinoma: In our patient, after Clinical M edicine and Diagnostics 2012, 2(5): 51-53 53 12h of fasting the insulin/glucose ratio was about 0.6 with an evident lowering trend. As expected, antiinsulin antibodies were elevated, yet in this case IAS was diagnosed along with diabetes mellitus. Broadly speaking, type 1 diabetes mellitus (T1DM) is associated with additional autoimmune d iseases, which are associated with the production of organ-specific autoantibo dies, however a few other cases with the association T1DM/IA S have been published. Here, along with IAA, high levels of GA DA were found in our patient: the concurrent presence of IAA and GADA in a subject with a positive OGTT is highly suggestive of new-onset T1DM. T1DM has a prodromal stage of islet autoimmun ity, and affected children develop up to four different antibody classes. We did not perform tests for Insulino ma Antigen-2 (IA-2A) or ZnT8 transporter autoantibodies (ZnT8A). Yet, the presence of IAA is suggestive of T1DM in its typical presentation, given that in Latent Autoimmune Diabetes of the Adult (LA DA) they are usually absent. HLA Class II typing revealed the presence of DRB1*04:03 DQB1* 03:02 and DQA 1*03:01 alleles in our patient. Japanese population shows the highest frequency of IAS in the world and patients present with DRB1*0403 (as in our patient) and DRB1*0406 DRB1*0407 alleles as well (not present in our case). However, DRB1*0403 is considered the “ancestral” allele of DRB1*0406. Our pat ient also possesses DQB1*03:02 and DQA 1*03:0 1 alleles, found in East Asia IAS cases outside Japan. It is worth pointing out that our patient was born in Bulgaria: fro m a genetic point of view, Bulgarian population shows a predominant Mediterranean HLA Class I pattern, but some rare haplotypes suggest the influence of other groups such Asians, Armen ian and Turkish. Unfortunately, we was not able to get a comprehensive familiar history fro m the patient. It must be emphasized that T1DM is often associated with the presence of additional autoimmune d iseases with many organ system involved. In our patient IAS was an epiphenomenon of immun ity derangement occurring during the development of Type 1 diabetes. Interestingly, on follo w-up the patient’s C peptide dropped to 0.7 ng/dl, along with IAA (decreased to 5.2 IU/ ml). At the same time the GA DA antibodies disappeared, as often seen in the prodromal stage of Type 1 d iabetes. The patient was prescribed a fractionated, normocalo ric diet (5 meals/day), and experienced a significant relief of symptoms, perhaps also due to IAA levels being reduced. The patient, despite the lo w level of C peptide, is still in good condition 12 months after the onset of symptoms, and so far, has not required insulin therapy. REFERENCES  Hirata Y, Ishizu H, Ouchi N, et al. Insulin autoimmunity in a case of spontaneous hypoglycaemia. J Jpn Diabetes Soc 1970; 13:312-320.  Uchigata Y, Hirata SY, Iwamoto Y. Insulin autoimmune syndrome (Hirata Disease) : Epidemiology in Asia including Japan. Diabetol Int 2010; 1: 21-25.  Lupsa BC, Chong AY, Cochran EK, Soos M A, Semple RK, Gorden P. Autoimmune forms of hypoglycaemia. M edicine (Baltimore) 2009; 88:141-153.  Bresciani E, Bussi A, Bazzigaluppi E, Balestrieri G. Insulin autoimmune syndrome induced by α-lipoic acid in a Caucasian woman: Case report. Diabetes Care 2011; 34: e146.  Annese S, Fadini G, M aran A. 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