Spatial and temporal expression of phosphorylated and non-phosphorylated forms of neurofilament proteins in the developing nervous system of Xenopus laevis

Brain Research. Developmental Brain Research
B G SzaroHarold Gainer

Abstract

Immunocytochemical studies of developing Xenopus laevis embryos and tadpoles (stages 12 1/2 to 46) were performed using a panel of 11 monoclonal antibodies to phosphorylated and non-phosphorylated forms of the neurofilament proteins. These included nine antibodies to the middle molecular weight neurofilament protein (XNF-M, 175 kDa), and two additional antibodies to non-phosphorylated forms of the other two neurofilament proteins (XNF-L, 73 kDa; XNF-H, 205 kDa). The developmental expression of XNF-M, XNF-L and XNF-H, and the progressive phosphorylation of XNF-M in the rhombencephalon, spinal cord, and optic nerve were studied using these antibodies. In the spinal cord and rhombencephalon, non-phosphorylated forms of XNF-M were initially detected during neural tube stages (stages 22-26), one day before XNF-L and XNF-H at early tadpole stages (stage 35/36). In the eye, XNF-M was observed initially during tailbud stages (stage 29/30), but neither XNF-L nor XNF-H was seen even by stage 46 (swimming tadpole). The phosphorylation of XNF-M occurred over a protracted period of several days, both in the neural tube and visual system, and could be divided into four phases. (1) When initially expressed, XNF-M was hypophosphorylated. This ...Continue Reading

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