中国神经再生研究(英文版) ›› 2020, Vol. 15 ›› Issue (7): 1290-1299.doi: 10.4103/1673-5374.272610

• 原著:脑损伤修复保护与再生 • 上一篇    下一篇

成年灵长类动物的大脑皮质中没有DCX阳性神经发生

  

  • 出版日期:2020-07-15 发布日期:2020-09-15

No DCX-positive neurogenesis in the cerebral cortex of the adult primate

Ruo-Xu Liu1, * , Jie Ma1 , Bin Wang1 , Tian Tian2 , Ning Guo1 , Shao-Jun Liu1, *   

  1. 1 Institute of Military Cognition and Brain Sciences, Beijing, China 2 Department of Pharmacy, Medical College, Huanghe S&T University, Zhengzhou, Henan Province, China
  • Online:2020-07-15 Published:2020-09-15
  • Contact: Ruo-Xu Liu, PhD, 942825591@qq.com; Shao-Jun Liu, PhD, shaojun_liu@126.com.
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (Key Program), No. 30430310 (to SJL); the State Key Laboratories Development Program of China, No. SKLP-K201401 (to SJL).

摘要:

orcid: 0000-0002-7731-787X (Ruo-Xu Liu) 

          0000-0001-7318-7628 (Shao-Jun Liu)

Abstract: Whether endogenous neurogenesis occurs in the adult cortex remains controversial. An increasing number of reports suggest that doublecortin (DCX)-positive neurogenesis persists in the adult primate cortex, attracting enormous attention worldwide. In this study, different DCX antibodies were used together with NeuN antibodies in immunohistochemistry and western blot assays using adjacent cortical sections from adult monkeys. Antibody adsorption, antigen binding, primary antibody omission and antibody-free experiments were used to assess specificity of the signals. We found either strong fluorescent signals, medium-weak intensity signals in some cells, weak signals in a few perikarya or near complete lack of labeling in adjacent cortical sections incubated with the various DCX antibodies. The putative DCX-positive cells in the cortex were also positive for NeuN, a specific marker of mature neurons. However, further experiments showed that most of these signals were either the result of antibody cross reactivity, the non-specificity of secondary antibodies or tissue autofluorescence. No confirmed DCX-positive cells were detected in the adult macaque cortex by immunofluorescence. Our findings show that DCX-positive neurogenesis does not occur in the cerebral cortex of adult primates, and that false-positive signals (artefacts) are caused by antibody cross reactivity and autofluorescence. The experimental protocols were approved by the Institutional Animal Care and Use Committee of the Institute of Neuroscience, Beijing, China (approval No. IACUC-AMMS-2014-501).

Key words: adult neurogenesis, antigen neutralization, autofluorescence, cross reaction, cross reactivity, doublecortin, neocortex, NeuN, non-specificity, primates, tissue adsorption