Latent autoimmune diabetes of adults

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Latent autoimmune diabetes of adults
Synonyms LADA, late-onset autoimmune diabetes of adulthood,[1] diabetes type 1.5
Blue circle for diabetes.svg
Universal blue circle symbol for diabetes[2]
Pronunciation /dəbts/
Classification and external resources
Specialty Endocrinology

Latent autoimmune diabetes of adults (LADA) is a form of diabetes mellitus type 1 that occurs in adulthood, often with a slower course of onset than type 1 diabetes diagnosed in juveniles.[3] Adults with LADA may initially be diagnosed incorrectly as having type 2 diabetes based on their age, particularly if they have risk factors for type 2 diabetes such as a strong family history or obesity.

The diagnosis is typically based on the finding of hyperglycemia together with the clinical impression that islet failure rather than insulin resistance is the main cause; detection of a low C-peptide and raised antibodies against the islets of Langerhans support the diagnosis. It can only be treated with the usual oral treatments for type 2 diabetes for a certain period of time,[4][5] after which insulin treatment is usually necessary, as well as long-term monitoring for complications.

The concept of LADA was first introduced in 1993,[6] though The Expert Committee on the Diagnosis and Classification of Diabetes Mellitus does not recognize the term, instead including it under the standard definition of diabetes mellitus type 1.[7]

Signs and symptoms[edit]

The symptoms of latent autoimmune diabetes of adults are similar to those of other forms of diabetes: polydipsia (excessive thirst and drinking), polyuria (excessive urination), and often blurred vision.[8] Compared to juvenile type 1 diabetes, the symptoms develop comparatively slowly, over a period of at least six months.[9]

Diagnosis[edit]

It is estimated that more than 50% of persons diagnosed as having non-obesity-related type 2 diabetes may actually have LADA. Glutamic acid decarboxylase autoantibody (GADA), islet cell autoantibody (ICA), insulinoma-associated (IA-2) autoantibody, and zinc transporter autoantibody (ZnT8) testing should be performed on all adults who are not obese who are diagnosed with diabetes.[10] However, some overweight patients are misdiagnosed with type 2 due to their weight. Moreover, it is now becoming evident that autoimmune diabetes may be highly underdiagnosed in many individuals who have diabetes, and that the body mass index levels may have rather limited use in connections with latent autoimmune diabetes.[10]

Persons with LADA typically have low, although sometimes moderate, levels of C-peptide as the disease progresses. Patients with insulin resistance or type 2 diabetes are more likely to, though will not always, have high levels of C-peptide due to an over production of insulin.[11][9]

Autoantibodies[edit]

Destruction of Glutamate decarboxylase (pictured here) via autoantibodies is strongly linked with LADA type 1 diabetes.

Glutamic acid decarboxylase autoantibodies (GADA), islet cell autoantibodies (ICA), insulinoma-associated (IA-2) autoantibodies, and zinc transporter autoantibodies (ZnT8) are all associated with LADA; glutamic acid decarboxylase antibodies are commonly found in cases of diabetes mellitus type 1.

The presence of Islet Cell Complement Fixing Autoantibodies also aids in a differential diagnosis between LADA and type 2 diabetes. Persons with LADA often test positive for ICA, whereas type 2 diabetics only seldom do.[11]

Persons with LADA usually test positive for Glutamic acid decarboxylase antibodies, whereas in type 1 diabetes these antibodies are more commonly seen in adults rather than in children.[11][12] In addition to being useful in making an early diagnosis for type 1 diabetes mellitus, GAD antibodies tests are used for differential diagnosis between LADA and type 2 diabetes[11][13][14] and may also be used for differential diagnosis of gestational diabetes, risk prediction in immediate family members for type 1, as well as a tool to monitor prognosis of the clinical progression of type 1 diabetes.

Classification[edit]

The Expert Committee on the Diagnosis and Classification of Diabetes Mellitus does not recognize the term "latent autoimmune diabetes" (LADA); rather, it includes LADA in the definition of Type 1 autoimmune diabetes: "Type 1 diabetes results from a cellular-mediated autoimmune destruction of the beta-cells of the pancreas. In type 1 diabetes, the rate of beta-cell destruction is quite variable, being rapid in some individuals (mainly infants and children) and slow in others (mainly adults).”[7] The National Institutes of Health (NIDDK) defines LADA as "a condition in which Type 1 diabetes develops in adults."[7]

Prevention[edit]

There are no known ways of preventing LADA type 1 diabetes,[15] though some researchers believe it could be prevented if a diagnosis is made prior to the body's destruction of its beta cells.[16]

Prevalence[edit]

It is estimated that between 6-50% of all persons, depending on population, diagnosed with type 2 diabetes might actually have LADA.[10] This number accounts for an estimated 5–10% of the total diabetes population in the U.S. or, as many as 3.5 million persons with LADA.[11] People with LADA typically have a normal BMI or may be underweight due to weight loss prior to diagnosis. Some people with LADA, however, may be overweight to mildly obese.[17]

Management[edit]

Main article: Diabetes management

About 80% of all LADA patients initially misdiagnosed with type 2 (and who have GAD antibodies) will become insulin-dependent within 3 to 15 years (according to differing LADA sources).[18][19]

The treatment for Type 1 diabetes/LADA is exogenous insulin to control glucose levels, prevent further destruction of residual beta cells, reduce the possibility of diabetic complications, and prevent death from diabetic ketoacidosis (DKA). Although LADA may appear to initially respond to similar treatment (lifestyle and medications) as type 2 diabetes, it will not halt or slow the progression of beta cell destruction, and people with LADA will eventually become insulin-dependent.[4] People with LADA have insulin resistance similar to long-term type 1 diabetes; some studies showed that people with LADA have less insulin resistance, compared with those with type 2 diabetes; however, others have not found a difference.[5]

History[edit]

Although type 1 diabetes has been identified as an autoimmune disease since the 1970s,[20] the concept of latent autoimmune diabetes mellitus was not noted until 1993, when it was used to describe slow-onset type 1 autoimmune diabetes occurring in adults.[21] This followed the concept that GAD autoantibodies were a feature of type 1 diabetes and not type 2 diabetes.[22]

References[edit]

Notes[edit]

  1. ^ Williams, Wilkins & Munden 2006, p. 20.
  2. ^ "Diabetes Blue Circle Symbol". International Diabetes Federation. 17 March 2006. Archived from the original on 5 August 2007. 
  3. ^ Stenström G., Gottsäter A., Bakhtadze E., Berger B., Sundkvist G. (December 2005). "Latent autoimmune diabetes in adults: definition, prevalence, beta-cell function, and treatment". National Center for Biotechnology Information. Retrieved January 20, 2017. 
  4. ^ a b Castro, M. Regina. "Latent autoimmune diabetes". Mayo Clinic. Retrieved May 26, 2014. 
  5. ^ a b Nguyen, Than, and Tara L. Muzyk (October 15, 2009). "LADA: A Little Known Type of Diabetes". Pharmacy Times. Retrieved May 26, 2014. 
  6. ^ Vandewalle C.L., Decraene, T.; Schuit, F.C.; De Leeuw, I.H.; Pipeleers, D.G.; and F.K. Gorus (November 1993). "Insulin autoantibodies and high titre islet cell antibodies are preferentially associated with the HLA DQA1*0301-DQB1*0302 haplotype at clinical type 1 (insulin-dependent) diabetes mellitus before age 10 years, but not at onset between age 10 and 40 years". Diabetologia. National Center for Biotechnology Information. PMID 8270130. 
  7. ^ a b c American Diabetes, Association (January 2007). "Diagnosis and classification of diabetes mellitus". Diabetes Care. 30 Suppl 1: S42–7. doi:10.2337/dc07-S042. PMID 17192378. 
  8. ^ Flynn, Choi & Wooster 2013, p. 286.
  9. ^ a b Eisenbarth 2010, p. 316.
  10. ^ a b c Landin-Olsson, Mona (April 2002). "Latent autoimmune diabetes in adults". Annals of the New York Academy of Sciences. 958: 112–116. doi:10.1111/j.1749-6632.2002.tb02953.x. PMID 12021090. 
  11. ^ a b c d e Pipi, Elena, Marietta Market, and Alexandra Tsirogianni (August 15, 2014). "Distinct clinical and laboratory characteristics of latent autoimmune diabetes in adults in relation to type 1 and type 2 diabetes mellitus.". National Center for Biotechnology Information. 
  12. ^ Khardori, Romesh (September 30, 2016). Griffing, George T., ed. "Diabetes Mellitus, Type 1: A Review". eMedicine.com. Retrieved January 20, 2017. 
  13. ^ Latent Autoimmune Diabetes in Adults; David Leslie, Cristina Valerie DiabetesVoice.org; 2003
  14. ^ Unnikrishnan AG, Singh SK, Sanjeevi CB (December 2004). "Prevalence of GAD65 antibodies in lean subjects with type 2 diabetes". Annals of the New York Academy of Sciences. 1037: 118–21. doi:10.1196/annals.1337.018. PMID 15699503. 
  15. ^ Stenström, Gunnar; Gottsäter, Anders; Bakhtadze, Ekaterina; Berger, Bo; Sundkvist, Göran (December 2005). "Latent Autoimmune Diabetes in Adults". American Diabetes Association. 
  16. ^ Bluestone JA, Herold K, Eisenbarth G (2010). "Genetics, pathogenesis and clinical interventions in type 1 diabetes". Nature. 464 (7293): 1293–1300. Bibcode:2010Natur.464.1293B. doi:10.1038/nature08933. PMID 20432533. 
  17. ^ Insulin resistance leads to LADA (Report). Diabetes Health. Retrieved April 10, 2010. 
  18. ^ Eisenbarth, George. "Prediction of Type I Diabetes". University of Colorado, Denver. Retrieved March 23, 2016. 
  19. ^ "Type 1.5 Diabetes". Bottom Line Health. Retrieved Mar 23, 2016. 
  20. ^ Bottazzo, GF; Florin-Christensen, A; Doniach, D (Nov 30, 1974). "Islet-cell antibodies in diabetes mellitus with autoimmune polyendocrine deficiencies.". Lancet. 2 (7892): 1279–83. doi:10.1016/s0140-6736(74)90140-8. PMID 4139522. 
  21. ^ Tuomi T, Groop LC, Zimmet PZ, Rowley MJ, Knowles W, Mackay IR (February 1993). "Antibodies to glutamic acid decarboxylase reveal latent autoimmune diabetes mellitus in adults with a non-insulin-dependent onset of disease". Diabetes. 42 (2): 359–62. doi:10.2337/diab.42.2.359. PMID 8425674. 
  22. ^ Hagopian, W A; Karlsen, A E; Gottsäter, A; Landin-olsson, M; Grubin, C E; Sundkvist, G; Petersen, J S; Boel, E; Dyrberg, T; Lernmark, A (January 1993). "Quantitative assay using recombinant human islet glutamic acid decarboxylase (GAD65) shows that 64K autoantibody positivity at onset predicts diabetes type Hagopian, W A ; Karlsen, A E ; Gottsäter, A ; Landin-olsson, M ; Grubin, C E ; Sundkvist, G ; Petersen, J S ; Boel, E ; Dyrberg, T ; Lernmark, A". The Journal of Clinical Investigation. 91 (1): 368–74. doi:10.1172/JCI116195. PMC 330036Freely accessible. PMID 8423232. 

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