Embryonic and adult neural stem cell research in China

Parental folic acid deficiency delays neurobehavioral development in rat offspring by inhibiting the differentiation of neural stem cells into neurons

Maternal folate status during pregnancy is associated with the neurodevelopment of offspring; however, study results on the association between paternal folate status and offspring neurodevelopment are inconsistent. This study aimed to explore whether parental folic acid deficiency affects the neurobehavioral development of offspring by affecting the differentiation of neural stem cells (NSCs) into neurons. In the present study, the offspring were divided into four groups: parental folic acid deficient group (D-D), maternal folic acid deficient and paternal folic acid normal group (D-N), maternal folic acid normal and paternal folic acid deficient group (N-D), and parental folic acid normal group (N-N). For in vivo study, neurobehavioral indexes, and neuron-specific nuclear protein (NeuN) and glial fibrillary acidic protein (GFAP) expression in the brain hippocampus and cerebral cortex of offspring were measured at different time points. For in vitro study, NSCs were cultured from the hippocampus and striatum, and neuronal and astrocytic differentiation were measured. The results demonstrated that parental folic acid deficiency decreased the brain folate level in offspring, delayed early sensory-motor reflex development, impaired spatial learning and memory ability in adolescence and adulthood, decreased differentiation of NSCs into neurons and increased differentiation of NSCs into astrocytes in vivo and in vitro. These impacts on the neurodevelopment of offspring were most pronounced in D-D group, followed by D-N group and N-D group. In conclusion, parental folic acid deficiency inhibits the neurobehavioral development of offspring, possibly by inhibiting the differentiation of NSCs into neurons.

From strict moral standards to ethical neutrality: a policy-guided shift in the patentability of human embryonic stem cells in China

Attitudes towards human embryonic stem cells (hESCs) in China have witnessed a significant shift in 2020 that can be attributed to China’s policy guidance. For ethical reasons, stricter standards are adopted to curb related regulations and patent licensing. Through the introduction of policies, some research on hESCs has been recognized as legitimate and feasible to a certain standard and scope. In the subsequent practice of patent examination, the dual influence of policy support and public interest has led to a shift in the examination standards of China’s intellectual property authority from “strict morality” to “ethical neutrality”, implying limited recognition of hESCs’ patentability. In view of the promotion of policy incentives for the transformation and application of corresponding research, there is considerable social demand to provide patent protection for research results. In this context, an adjustment of related regulations is illustrated in this revision, manifesting a partial shift in regulations towards a supportive stance consistent with policy.