Abstract
Background: Diabetes mellitus and depression are comorbidities that can be caused by each other. Brain-derived neurotrophic factor (BDNF) functions as a neuronal growth factor. It maintains the functional integrity of the nervous system.
Aim: To study the possible association between BDNF levels and gene polymorphism with depression in patients diagnosed with type 2 diabetes mellitus.
Methods: The Elisa technique measured BDNF, and rs6265 gene polymorphism was detected using real-time PCR. Depression was assessed utilizing a clinical interview tool designed to establish the diagnosis of depression and differentiate it from other psychiatric diseases.
Results: BDNF levels were significantly lower in patients with type 2 diabetes mellitus and symptoms of depression than in patients with type 2 diabetes mellitus and no symptoms of depression (82.6±16.1. Vs 122± 17.47, p˂ 0.001). There was a statistically significant difference in BDNF levels in patients with diabetes among the three genotypes of the BDNF gene (p-value < 0.001). Val/ Val carriers had the highest serum BDNF levels, and Met/ Met carriers had the lowest serum BDNF levels. Subgroup analysis showed statistically significant genotype-related differences in serum BDNF levels among the three subgroups in the Depression group. Val/ Val carriers had the highest serum BDNF levels, and Met/ Met carriers had the lowest serum BDNF levels. BDNF Val66Met polymorphism had no significant association with the presence of depression, yet there was a trend towards significance (p = 0.05)
Conclusion: In this pilot, Low levels of BDNF were associated with depression in patients with type 2 diabetes. Carriers of the Met/ Met allele have the lowest serum BDNF levels. Multicenter studies with more participants are required.
[http://dx.doi.org/10.12816/0009361]
[http://dx.doi.org/10.1001/jama.299.23.2751] [PMID: 18560002]
[http://dx.doi.org/10.2337/dc08-0985] [PMID: 19033418]
[http://dx.doi.org/10.4088/JCP.12r07922] [PMID: 23419223]
[http://dx.doi.org/10.1007/s00125-010-1874-x] [PMID: 20711716]
[http://dx.doi.org/10.2337/dc09-0071] [PMID: 19389814]
[http://dx.doi.org/10.1136/jnnp.23.1.56] [PMID: 14399272]
[http://dx.doi.org/10.3758/CABN.6.1.79] [PMID: 16869232]
[http://dx.doi.org/10.1523/JNEUROSCI.5100-09.2010] [PMID: 20130183]
[http://dx.doi.org/10.1016/j.ygeno.2007.05.004] [PMID: 17629449]
[http://dx.doi.org/10.1007/s12035-018-1283-6] [PMID: 30117106]
[http://dx.doi.org/10.1016/S0092-8674(03)00035-7] [PMID: 12553913]
[http://dx.doi.org/10.1055/s-0029-1224162] [PMID: 19924587]
[http://dx.doi.org/10.14336/AD.2017.0717] [PMID: 29896439]
[http://dx.doi.org/10.1186/1744-9081-9-34] [PMID: 23968401]
[http://dx.doi.org/10.1038/sj.mp.4000952] [PMID: 11840305]
[http://dx.doi.org/10.1097/00001756-200105080-00025] [PMID: 11338187]
[http://dx.doi.org/10.1038/nn927] [PMID: 12368805]
[http://dx.doi.org/10.1038/350230a0] [PMID: 2005978]
[http://dx.doi.org/10.1017/S1461145710000738] [PMID: 20604989]
[http://dx.doi.org/10.2337/dc21-S002] [PMID: 33298413]
[http://dx.doi.org/10.1007/s11033-011-1408-8] [PMID: 22228086]
[PMID: 15024452]
[PMID: 14770254]
[http://dx.doi.org/10.1016/j.aogh.2015.12.011] [PMID: 27108148]
[http://dx.doi.org/10.1038/s41598-018-26138-5] [PMID: 29777153]
[http://dx.doi.org/10.1097/00006842-200107000-00015] [PMID: 11485116]
[http://dx.doi.org/10.2337/dc09-0132] [PMID: 19720842]
[PMID: 15745842]
[PMID: 27453739]
[http://dx.doi.org/10.1007/s13300-017-0231-1] [PMID: 28160185]
[http://dx.doi.org/10.1007/s00592-019-01295-9] [PMID: 30903433]
[http://dx.doi.org/10.1002/gps.2363] [PMID: 19711303]
[http://dx.doi.org/10.1016/S2213-8587(15)00134-5] [PMID: 25995124]
[http://dx.doi.org/10.1080/00207454.2018.1527328] [PMID: 30235967]
[http://dx.doi.org/10.1016/j.brainres.2014.10.019] [PMID: 25451089]
[http://dx.doi.org/10.1016/j.brainresbull.2009.06.022] [PMID: 19589373]
[http://dx.doi.org/10.7759/cureus.5145] [PMID: 31523573]
[http://dx.doi.org/10.2337/diacare.23.1.23] [PMID: 10857963]
[http://dx.doi.org/10.1016/j.jad.2020.01.114] [PMID: 32056914]
[http://dx.doi.org/10.1016/j.metabol.2006.02.012] [PMID: 16784955]
[http://dx.doi.org/10.1007/s12035-015-9461-2] [PMID: 26454822]
[http://dx.doi.org/10.3390/ijms19082281] [PMID: 30081509]
[http://dx.doi.org/10.1007/s00592-020-01486-9] [PMID: 32025863]
[http://dx.doi.org/10.1093/ijnp/pyy008] [PMID: 29432620]
[http://dx.doi.org/10.1002/ajmg.b.32062] [PMID: 22610920]
[http://dx.doi.org/10.1016/j.pnpbp.2011.02.009] [PMID: 21338649]
[http://dx.doi.org/10.1038/mp.2008.109] [PMID: 18852698]