Treatment and five-year follow-up of type A insulin resistance syndrome:A case report

INTRODUCTION

Insulin resistance(IR)is a condition that cells,tissues or organs can't respond properly to a given dose of insulin.[1].Type A insulin resistance syndrome(TAIRS)is an autosomal recessive or dominant genetic disease[2].Insulin receptor gene mutation affects insulin and insulin receptors,leading to insulin dysfunction[3].Teenage females are more commonly affected and mainly develop severe IR,hyperandrogenism and acanthosis nigricans,which may be accompanied by polycystic ovary syndrome.

In this report,a female patient aged 11 years and 9 mo was diagnosed with severe IR and hyperandrogenism after comprehensive physical examination and related examinations.She was given oral medication,was followed up to observe changes in clinical symptoms and signs,and underwent monitoring of metabolism,IR and androgen levels.This study aimed to observe and analyze the curative effect of drugs in this patient,improve the understanding of the etiology and mechanism of TAIRS and explore effective treatment schemes.

CASE PRESENTATION

Chief complaints

The female patient aged 11 years and 9 mo was admitted to our outpatient clinic due to hairiness and melanosis of the skin and hoarseness.

History of present illness

On October 30,2015,the girl was admitted to our outpatient clinic due to hairiness and melanosis of the skin and hoarseness.Pigmentation started soon after birth without an obvious cause,and the child had noticeably more hair on her body than children of the same age.In addition,the degree of severity gradually increased with age.Pubic hair appeared 8 mo prior to presentation and was noted to be increasing rapidly;the patient’s voice became hoarse 4 mo prior to presentation.She denied complaints of headache,dizziness,fatigue,abdominal pain and other discomfort.

The patient was born with a birth weight of 2650 g.After birth,she was noted to have excessive hair on her body and excessive skin pigmentation.

History of past illness

Wang CL conceived and designed the research;Chen YH and Chen QQ analyzed the data.Chen YH,Chen QQ,and Wang CL wrote the manuscript.

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Personal and family history

Family history was significant for diabetes in her father,grandfather and aunt.

Physical examination

Sometime later, years later, my grandmother gave me the clock and the key. The old house was quiet. No bowls clanging, no laughter over the dinner table, no ticking or chiming of the clock-all was still. The hands on the clock were frozen, a reminder7 of time slipping away, stopped at the precise moment when my grandfather had ceased winding it. I took the key in my shaking hand and opened the clock door. All of a sudden, I was a child again, watching my grandfather with his silver-white hair and twinkling blue eyes. He was there, winking8 at me, at the secret of the clock s magic, at the key that held so much power. I stood, lost in the moment for a long time. Then slowly, reverently9, I inserted the key and wound the clock. It sprang to life. Tick-tock, tick-tock, life and chimes were breathed into the dining room, into the house and into my heart. In the movement of the hands of the clock, my grandfather lived again.

Physical examination showed as follows: height 149 cm,weight 36 kg,BMI 16.21 kg/m,hirsutism,dense pubic hair,and perineal pubic hair distributed in diamond shape.The skin showed acanthosis-like changes(Figure 1).There was no acne or thyroid enlargement.Her pubertal development was Tanner grade IV.

Laboratory examinations

Routine blood tests,blood gas analysis,thyroid function,liver and kidney function tests showed that 17-hydroxyprogesterone,alpha fetoprotein and human chorionic gonadotropin were normal.Cortisol rhythm was also normal(5.48 µg/dL at 8 am;5.12 µg/dL at 4 pm;and 12.8 pg/mL of adrenocorticotropic hormone at 8 am).At 24 h,urine free cortisol was 95.37 μg(reference range 20.9-292.3 μg).The dehydroepiandrosterone sulfate level was 76.45 μg/mL(reference range 0.3-1.47 μg/mL).The androstenedione level was 5.03 ng/mL(reference range 0.50-4.70 ng/mL).The sex hormone levels were as follows: follicle stimulating hormone was 4.9 mIU/mL,luteinizing hormone was 4.65 mIU/mL,testosterone was 128.7 ng/dL,estradiol was 48.0 pg/mL,and prolactin was 4.5 ng/mL.A 75 g glucose tolerance test was performed,which showed that fasting blood glucose was 4.3 mmol/L and 2-h blood glucose was 13 mmol/L.Hemoglobin A1c(HbA1c)was 6.9%.

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Imaging examinations

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FINAL DIAGNOSIS

The clinical manifestations and laboratory diagnosis of this patient indicated TAIRS.Therefore,after obtaining the consent of the patient and her family,genetic testing was performed.The results showed that INSR gene had a mutation.(c.3614C>T).

TREATMENT

We recommended that the patient work on strengthening exercises and adopt a controlled diet.Treatment with metformin 1.0 g/d was administered.However,the patient suffered fasting hypoglycemia many times;therefore,metformin was changed to pioglitazone 15 mg/d.In addition,hyperandrogenism was treated with flutamide.

OUTCOME AND FOLLOW-UP

At present,there is no guideline or consensus statement to describe how to best treat patients with severe IR.The treatment of patients mainly aims to prevent long-term complications caused by diabetes and hyperandrogenism[6].Maintaining body weight and BMI plays an important role in maintaining blood glucose homeostasis[7].There is no definitive and effective drug treatment for type A IR,and the use of metformin,insulin sensitizer,and insulin-like growth factor-1 has been reported.Metformin,a biguanide derivative,has been demonstrated to have beneficial results in further decreasing BMI.The molecular mechanism of metformin is not completely clear.Many potential mechanisms of action have been proposed,such as inhibiting mitochondrial respiratory chain(complex I),activating AMPactivated protein kinase(AMPK),and inhibiting glucagon-induced increase of cyclic adenosine monophosphate(cAMP),while reducing the activation of protein kinase A(PKA),inhibition of mitochondrial glycerophosphate dehydrogenase,and an effect on gut microbiota[8,9].Metformin inhibits the secretion of growth hormone,adrenocorticotropic hormone,follicle stimulating hormone and anterior melanocortin from the pituitary basal body,which partly explains its insulin sensitization effect through various actions on tissues,including liver,skeletal muscle,endothelium,adipose tissue and ovaries.[10].However,in this case,oral metformin was discontinued due to repeated fasting hypoglycemia,and the patient was given pioglitazone.Pioglitazone selectively stimulates nuclear receptor peroxisome proliferator-activated receptor gamma(PPAR-γ)and,to a lesser extent,PPAR-α[11].Pioglitazone modulates transcription of the genes involved in the control of glucose and lipid metabolism in the muscle,adipose tissue,and liver.As a result,pioglitazone reduces IR in the liver and peripheral tissues,decreases gluconeogenesis in the liver,and reduces the quantities of glucose and glycated hemoglobin in the bloodstream[12].After treatment,our patient showed a significant decrease in fasting insulin,and her glucose metabolism improved.Acanthosis nigricans also faded significantly.She had menarche when she was 13 years old,but her menstruation was irregular.Up to now,no adverse reactions have occurred.

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Following the administration of pioglitazone,plasma glucose,plasma insulin,and HbA1c normalized,as shown in Figure 2 and Figure 3.During treatment,the patient did not have any hypoglycemic attacks or abnormal routine laboratory data.Acanthosis nigricans also seemed to improve gradually.Hirsutism and serum testosterone concentration slowly improved after the administration of flutamide,as shown in Figure 4.Menstruation started 9 mo after initiation of treatment;however,it was noted to be irregular.

DISCUSSION

In this report,we described a child with hirsutism and acanthosis nigricans on examination.Blood lipid metabolism abnormalities were not observed on biochemical examination.Hormone level testing suggested the existence of hyperandrogenism and severe IR.Genetic testing showed INSR c.3614C>T;thus,TAIRS was diagnosed.

Insulin is an important regulator of sex hormone metabolism.High insulin leads to a decrease in sex hormone binding protein synthesis in the liver and stimulates androgen synthesis in the ovary and adrenal glands[4].However,high androgen levels can inhibit the effect of insulin stimulating the uptake of glucose by tissues,thereby causing IR[5].Therefore,hyperinsulinemia interacts with hyperandrogenism,causing a vicious cycle.

Blood sampling was performed on admission and every 3 mo thereafter to evaluate the patient’s plasma glucose profile,HbA1C,plasma insulin,and sex hormone levels.Height and weight were measured on each admission.A 75 g glucose tolerance test was performed 15 mo after treatment.

Treating TAIRS is challenging.Recombinant human IGF-1 can activate IGF-1 receptor,and it can be an effective treatment for TAIRS,because IGF-1 receptor shares structural homology and downstream signal pathway with INSR.[13].However,recombinant human IGF-1 therapy is expensive,and the drug is not available in China.Glucagon-like peptide 1(GLP-1)receptor agonists stimulate GLP-1 receptors in the pancreas and thereby increase insulin release and inhibit glucagon secretion,but they are not approved by the FD[14].SGLT2 inhibitor is a new type of antidiabetic drug,which can reduce blood sugar by inhibiting renal glucose reabsorption,and has nothing to do with insulin.[15].A recent study showed that a sodium–glucose cotransporter 2 inhibitor had a good therapeutic effect in a patient with TAIRS[16];however,further research is required.Patients who fail to take oral hypoglycemic drugs usually require a larger dose of insulin.

Patients with hirsutism,acne,and amenorrhea caused by hyperandrogenemia can be treated with anti-androgen drugs such as cyproterone acetate,flutamide,and spironolactone.Flutamide,as a selective antagonist of androgen receptor(AR),competes with androgens such as testosterone and dihydrotestosterone to bind AR in prostate and other tissues.Flutamide prevents their effects and prevents them from stimulating the growth of prostate cancer cells.Studies have shown that flutamide is effective in treating hirsutism[17].Following flutamide application,hirsutism in this patient was obviously improved.

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I heard the footsteps7 on the sidewalk and the light tap on the wooden door. My lip began to quiver8, opening a new floodgate of tears, and I hid behind Brother Lu. Mom walked in first and hugged him, then looked at me with a weak smile. Her eyes were swollen9 from her own tears, and I was thankful she had not wept in front of me. And then he was there. He didn t even shake Luther s hand, just nodded as he swept by, coming to me and gathering10 me up into his strong arms, holding me close as he whispered to me, I love you. I love you, and I will love your baby, too.

CONCLUSION

In conclusion,there is no definite treatment for TAIRS.Based on 5 years of follow-up,our protocol is inexpensive,effective,and was not associated with side effects in this patient with TAIRS.

Transrectal color Doppler ultrasound of the uterine annex showed no polycystic changes in either ovary.Head MRI,abdominal B-ultrasound,cardiac B-ultrasound and adrenal B-ultrasound were normal.

FOOTNOTES

The growth and development of the patients are similar to those of their peers,and there is no long-term medication history.

Informed written consent was obtained from the patient’s parents for publication of this report and any accompanying images.

The authors declare that they have no conflicts of interest related to this manuscript.

The authors have read the CARE Checklist(2016),and the manuscript was prepared and revised according to the CARE Checklist(2016).

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China

The King had already been married once, and had by his first wife seven children, six boys and one girl,12 whom he loved more than anything in the world

Yong-Hua Chen 0000-0001-6621-1466;Qing-Qing Chen 0000-0003-4295-6871;Chun-Lin Wang 0000-0002-8288-3075.

Ma YJ

Webster JR

Ma YJ