Secondary Logo

Journal Logo

Tacrolimus-induced diabetic ketoacidosis with subsequent rapid recovery of endogenous insulin secretion after cessation of tacrolimus

A case report with review of literature

Maruyama, Koji MDa; Chujo, Daisuke MD, PhDa,b,*

Section Editor(s): NA.,

doi: 10.1097/MD.0000000000016992
Research Article: Clinical Case Report

Rationale: Immunosuppressive agents such as tacrolimus (TAC) and cyclosporin might cause glycemic disorders by suppressing insulin production. However, only a few cases of diabetic ketoacidosis (DKA) with longitudinal evaluation of endogenous insulin secretion related to TAC administration have been reported.

Patient concerns: A 59-year-old Asian woman, who received prednisolone and TAC 4.0 mg for the treatment of anti-aminoacyl-tRNA synthetase antibody-positive interstitial pneumonia, was admitted to our hospital due to impaired consciousness and general malaise.

Diagnoses: She had metabolic acidosis; her plasma glucose, fasting serum C-peptide immunoreactivity (CPR), and urinary CPR levels were 989 mg/dL (54.9 mmol/L), 0.62 ng/mL, and 13.4 μg/d, respectively. No islet-related autoantibodies were detected. Therefore, she was diagnosed with TAC-induced DKA.

Intervention: Intravenous continuous insulin infusion and rapid saline infusion were administered. TAC was discontinued because of its diabetogenic potential.

Outcomes: Sixteen weeks after cessation of TAC administration, she showed good glycemic control without administration of insulin or any oral hypoglycemic agents; her serum CPR level also improved dramatically. These findings suggested that TAC-induced pancreatic beta cell toxicity is reversible.

Lessons: We reported a case of TAC-induced DKA with subsequent recovery of pancreatic beta cell function after cessation of TAC, resulting in good glycemic control. As TAC is widely used, we should pay attention to patients’ glucose levels even though the TAC concentrations used are within the target range. Furthermore, dose reduction or cessation of TAC should be considered if hyperglycemia is detected during administration of this agent.

aDepartment of Diabetes, Endocrinology and Metabolism, National Center for Global health and Medicine, Tokyo

bCenter for Clinical Research, Toyama University Hospital, Toyama, Japan.

Correspondence: Daisuke Chujo, Center for Clinical Research, Toyama University Hospital, 2630, Sugitani, Toyama 930-0194, Japan (e-mail:

Abbreviations: BMI = body mass index, CAT = chloramphenicol acetyltransferase, CPR = C-peptide immunoreactivity, DKA = diabetic ketoacidosis, FKBP-12 = FK506-binding protein 12, HbA1c = glycosylated hemoglobin, PSL = prednisolone, TAC = tacrolimus, tRNA = transfer ribonucleic acid.

How to cite this article: Maruyama K, Chujo D. Tacrolimus-induced diabetic ketoacidosis with subsequent rapid recovery of endogenous insulin secretion after cessation of tacrolimus. Medicine 2019;98:36(e16992).

The authors have no conflicts of interest to disclose.

Received February 5, 2019

Received in revised form June 29, 2019

Accepted August 7, 2019

This is an open access article distributed under the Creative Commons Attribution License 4.0 (CCBY), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Back to Top | Article Outline

1 Introduction

Tacrolimus (TAC) is widely used as an immunosuppressive agent for suppressing rejection of transplanted organs or tissues and for treating inflammatory diseases, such as nephritic syndrome, rheumatic arthritis, and interstitial pneumonia secondary to polymyositis or dermatomyositis. TAC and cyclosporin have been reported to cause post-transplant diabetes.[1] The diabetogenic potential of TAC is considered to involve suppression of insulin secretion from pancreatic beta cells by inhibiting transcription of the insulin gene, due to the association between TAC and the FK506-binding protein 12 (FKBP-12).[2] Although some cases of TAC-related diabetic ketoacidosis (DKA) have been reported,[1,3] few cases have involved changes in insulin secretion before and after TAC cessation. Herein, we reported a case of DKA induced by TAC, which was being administered for interstitial pneumonia treatment, with subsequent rapid recovery of endogenous insulin secretion after cessation of TAC administration.

Back to Top | Article Outline

2 Case report

A 59-year-old Asian woman presenting with impaired consciousness and general malaise was brought to our hospital by her family. She had been diagnosed with anti-aminoacyl-tRNA synthetase antibody-positive interstitial pneumonia in February 2017 (13 months before admission) with the complaint of exertional dyspnea. She had never been diagnosed with diabetes; 13 months before admission, her glycosylated hemoglobin (HbA1c) level was 6.1%. On diagnosis of interstitial pneumonia, she started receiving 60 mg of methylprednisolone, followed by 40 mg of prednisolone (PSL) and 4.0 mg of TAC, which was considered effective and well-tolerated therapy for interstitial lung disease with anti-aminoacyl-tRNA synthetase antibody.[4] The dosage of PSL was gradually decreased, and 5.0 mg of PSL and 4.0 mg of TAC had been continued to maintain the remission of interstitial pneumonia. She had no other specific medical history or any significant family history. Following were her vital signs on admission: blood pressure, 110/66 mmHg; respiratory rate, 18 breaths/min; pulse rate, 97 beats/min; and SpO2, 96% on room air. Her height was 159 cm and her weight was 90 kg; her body mass index (BMI) was 35.6 kg/m2. On physical examination, lungs were clear to auscultation and no significant abnormalities were observed, except slight dehydration of the tongue and axilla. Laboratory data revealed the following: extremely high plasma glucose levels, 989 mg/dL (54.9 mmol/L); presence of urinary ketone bodies; blood pH, 6.85; and bicarbonate level, 2.4 mmol/L; these findings met the diagnostic criteria for DKA proposed by the American Diabetes Association.[5] Fasting serum C-peptide immunoreactivity (CPR) was 0.62 ng/mL and urinary CPR was 13.4 μg/d, indicating deterioration of endogenous insulin secretion. No islet-related autoantibodies were detected (Table 1). Other laboratory data are shown in Table 1. Intravenous continuous insulin infusion and rapid saline infusion were administered; 2 days after admission, insulin administration was switched to multiple daily subcutaneous injections using insulin lispro and insulin glargine 300 mL/unit. The maximum amount of subcutaneous insulin administered was up to 0.9 unit/kg/d. Sixteen days after admission, 10 mg of empagliflozin was also administered for inducing weight reduction. She was discharged with a prescription of 25 units/d of total daily insulin and 10 mg of empagliflozin; the dosage of PSL and TAC were maintained at 5.0 and 4.0 mg, respectively. TAC was discontinued 4 weeks after the onset of DKA as good control of interstitial pneumonia was noted. She did not require insulin lispro and insulin glargine 300 mL/unit to maintain stable glycemic control 4 and 8 days after cessation of TAC, respectively. Finally, although empagliflozin administration was also stopped 16 weeks after TAC cessation, her blood glucose levels were under good control; her HbA1c level was 6.2%, even though PSL administration was continued. Notably, her fasting serum CPR level rapidly recovered to 4.15 ng/mL, which is within the normal range, 8 weeks after TAC cessation and was maintained at similar levels thereafter (Fig. 1). Written informed consent was obtained from the patient for publication of this case report.

Table 1

Table 1

Figure 1

Figure 1

Back to Top | Article Outline

3 Discussion

TAC or FK506, produced by Streptomyces tsukubaensis, was discovered as a macrolide antibiotic in Japan in 1984 and is used as a novel immunosuppressant.[6] FK506 binds to FKBP-12, a cytoplasmic receptor, and this complex inhibits the phosphatase activity of calcineurin, resulting in prohibition of transcription of T-cell activating genes, such as the gene for IL-2.[7] The diabetogenic effect of TAC is predominantly a result of suppression of insulin secretion from pancreatic beta cells and not of deterioration of peripheral insulin sensitivity.[2,8] TAC suppresses transcription of insulin mRNA in beta cells in a time-dependent manner, leading to decreased insulin production; however, it does not affect pancreatic alfa cells.[2] In addition, TAC has also been reported to cause decreased expression of the insulin promoter chloramphenicol acetyltransferase (CAT) reporter gene.[9]

Due to this diabetogenic potential of TAC, 7.1% of patients with interstitial pneumonia secondary to polymyositis and dermatomyositis receiving TAC developed newly-diagnosed diabetes during a 3-year investigation period in Japan.[10] Although it is unclear why only a few TAC-receiving individuals develop DKA, 15 cases of TAC-induced DKA have been reported after transplantation.[1] Mean age of these patients was 29.9 years; 47% of them were men; average BMI was in the normal range (22.1 ± 4.7 kg/m2) and 40% developed DKA within the first 3 months of transplantation. Table 2 shows details of the TAC-induced DKA cases that involved diseases other than transplantation. Out of 4 patients (including our patient), 3 had kidney diseases, such as focal segmental glomerulosclerosis,[3] minimal change glomerulopathy,[11] and lupus nephritis.[12] To the best of our knowledge, this is the first case of TAC-induced DKA in which TAC was used for treating interstitial pneumonia. These 4 patients developed DKA despite receiving <10 ng/mL of TAC, indicating appropriate trough levels for minimizing diabetes risk.[13] TAC effect on insulin secretion is considered dose- and time-dependent in vitro.[9] The maximal decrease in insulin secretion is seen after 72 hours, and no further decrease occurred.[9] According to that data, we assumed that insulin secretion ability was suppressed several days after TAC administration. However, we could not find the constant tendency regarding dose or time before the onset of DKA among the cases including ours. Our case was also administrated PSL and gained approximately 10 kg weight gain since PSL administration had been initiated, leading to insulin resistance increase. It may depend on the balance between suppressed insulin secretion by diabetogenic drugs and insulin resistance caused by obesity or other factors when DKA occurred. Although high BMI combined with TAC and PSL administration might contribute to the development of DKA, it is difficult to speculate further mechanisms due to the lack of such cases. However, the expression levels of calcineurin and FKBP-12 in pancreatic endocrine cells should be considered. Because pancreatic alfa cells contain more calcineurin and fewer FKBP-12 than beta cells, glucagon secretion from alfa cells is not affected by TAC.[2] Differences in calcineurin and FKBP-12 expression levels among individuals might affect the amount of insulin secretion, leading to differences in diabetogenic effects of TAC.

Table 2

Table 2

If diabetes occurs during TAC therapy, physicians should consider dose reduction, cessation of TAC administration, and use of alternative agents, such as cyclosporine, that have less diabetogenic potential than TAC.[14] Additionally, a rapid tapering or cessation of corticosteroid also should be considered.[15] The diabetogenic effect of TAC is usually considered to be dose dependent and reversible.[2] Both insulin production and mRNA transcription completely recovered 7 days after the cessation of TAC in vitro; insulin secretion recovered when TAC concentration became <0.09 ± 0.11 ng/mL in rats.[2] Furthermore, Sarkar et al[3] reported a patient who showed recovered insulin secretion 12 weeks after cessation of TAC administration. In our case, endogenous insulin secretion and glycemic control improved dramatically 8 weeks after TAC withdrawal, consistent with previous reports.[3,15] Thus, our case also demonstrated that TAC-induced pancreatic beta cell toxicity is reversible and that insulin secretion recovers within several weeks of discontinuing TAC in vivo.

Since TAC is not only used as an immunosuppressant after organ or tissue transplantation but also for treating various inflammatory diseases, blood sugar levels should be routinely monitored in patients on TAC based on this case report and reported literatures. TAC-induced glycemic disorders including DKA might be life-threatening, even when trough levels of the drug are within the target range. In the future, accumulation of similar cases is necessary to analyze associated risks and background characteristics of TAC-induced DKA.

Back to Top | Article Outline

4 Conclusion

We reported a case of DKA induced by TAC, used for treating interstitial pneumonia, involving subsequent dramatic recovery of insulin secretion after cessation of TAC. As TAC is widely used for treating various diseases, attention should be paid to glycemic disorders, even though TAC concentrations are within the target range.

Back to Top | Article Outline


This study was not funded by any grants. The authors would like to thank Editage (Tokyo, Japan; for English language editing.

Back to Top | Article Outline

Author contributions

Supervision: Daisuke Chujo.

Writing – original draft: Koji Maruyama.

Writing – review & editing: Koji Maruyama, Daisuke Chujo.

Back to Top | Article Outline


[1]. Ammari Z, Pak SC, Ruzieh M, et al. Posttransplant tacrolimus-induced diabetic ketoacidosis: review of the literature. Case Rep Endocrinol 2018;2018:4606491.
[2]. Tamura K, Fujimura T, Tsutsumi T, et al. Transcriptional inhibition of insulin by FK506 and possible involvement of FK506 binding protein-12 in pancreatic beta-cell. Transplantation 1995;59:1606–13.
[3]. Sarkar S, Mondal R, Nandi M, et al. Tacrolimus induced diabetic ketoacidosis in nephrotic syndrome. Indian J Pediatr 2013;80:596–7.
[4]. Wilkes MR, Sereika SM, Fertig N, et al. Treatment of antisynthetase-associated interstitial lung disease with tacrolimus. Arthritis Rheum 2005;52:2439–46.
[5]. American Diabetes Association. Hospital admission guidelines for diabetes mellitus. Diabetes Care 2003;26(suppl):S118.
[6]. Starzl TE, Todo S, Fung J, et al. FK 506 for liver, kidney, and pancreas transplantation. Lancet 1989;2:1000–4.
[7]. Tocci MJ, Matkovich DA, Collier KA, et al. The immunosuppressant FK506 selectively inhibits expression of early T cell activation genes. J Immunol 1989;143:718–26.
[8]. Oetjen E, Baun D, Beimesche S, et al. Inhibition of human insulin gene transcription by the immunosuppressive drugs cyclosporin A and tacrolimus in primary, mature islets of transgenic mice. Mol Pharmacol 2003;63:1289–95.
[9]. Redmon JB, Olson LK, Armstrong MB, et al. Effects of tacrolimus (FK506) on human insulin gene expression, insulin mRNA levels, and insulin secretion in HIT-T15 cells. J Clin Invest 1996;98:2786–93.
[10]. Wakasugi N, Uno S, Tanaka H, et al. Evaluation of treatment status and safety of tacrolimus in patients with interstitial pneumonia complicated with polymyositis or dermatomyositis. J N Remed Clin 2017;66:1237–49.
[11]. Dittrich K, Knerr I, Rascher W, et al. Transient insulin-dependent diabetes mellitus in children with steroid-dependent idiopathic nephrotic syndrome during tacrolimus treatment. Pediatr Nephrol 2006;21:958–61.
[12]. Lanata CM, Mahmood T, Fine DM, et al. Combination therapy of mycophenolate mofetil and tacrolimus in lupus nephritis. Lupus 2010;19:935–40.
[13]. Webster AC, Woodroffe RC, Taylor RS, et al. Tacrolimus versus ciclosporin as primary immunosuppression for kidney transplant recipients: meta-analysis and meta-regression of randomised trial data. BMJ 2005;331:810.
[14]. Montori VM, Basu A, Erwin PJ, et al. Posttransplantation diabetes: a systematic review of the literature. Diabetes Care 2002;25:583–92.
[15]. Prokai A, Fekete A, Pasti K, et al. The importance of different immunosuppressive regimens in the development of posttransplant diabetes mellitus. Pediatr Diabetes 2012;13:81–91.

diabetic ketoacidosis; insulin secretion; interstitial pneumonia; tacrolimus

Copyright © 2019 The Authors. Published by Wolters Kluwer Health, Inc. All rights reserved.