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Stage Dependent Effects of Progesterone on Motoneurons and Glial Cells of Wobbler Mouse Spinal Cord Degeneration

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Abstract

In the Wobbler mouse, a mutation in the Vps54 gene is accompanied by motoneuron degeneration and astrogliosis in the cervical spinal cord. Previous work has shown that these abnormalities are greatly attenuated by progesterone treatment of clinically afflicted Wobblers. However, whether progesterone is effective at all disease stages has not yet been tested. The present work used genotyped (wr/wr) Wobbler mice at three periods of the disease: early progressive (1–2 months), established (5–8 months) or late stages (12 months) and age-matched wildtype controls (NFR/NFR), half of which were implanted with a progesterone pellet (20 mg) for 18 days. In untreated Wobblers, degenerating vacuolated motoneurons were initially abundant, experienced a slight reduction at the established stage and dramatically diminished during the late period. In motoneurons, the cholinergic marker choline acetyltransferase (ChAT) was reduced at all stages of the Wobbler disease, whereas hyperexpression of the growth-associated protein (GAP43) mRNA preferentially occurred at the early progressive and established stages. Progesterone therapy significantly reduced motoneuron vacuolation, enhanced ChAT immunoreactive perikarya and reduced the hyperexpression of GAP43 during the early progressive and established stages. At all stage periods, untreated Wobblers showed high density of glial fibrillary acidic protein (GFAP)+ astrocytes and decreased number of glutamine synthase (GS) immunostained cells. Progesterone treatment down-regulated GFAP+ astrocytes and up-regulated GS+ cell number. These data reinforced the usefulness of progesterone to improve motoneuron and glial cell abnormalities of Wobbler mice and further showed that therapeutic benefit seems more effective at the early progressive and established periods, rather than on advance stages of spinal cord neurodegeneration.

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Acknowledgments

This work was supported by FONCYT (BID 1728 OC AR PICT 2004 5-25610 and PICT 2007-01044), CONICET (PIP 112-200801-00542), the University of Buenos Aires (M016 and M611) and a cooperative program INSERM/CONICET.

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Correspondence to Alejandro F. De Nicola.

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Meyer, M., Gonzalez Deniselle, M.C., Garay, L.I. et al. Stage Dependent Effects of Progesterone on Motoneurons and Glial Cells of Wobbler Mouse Spinal Cord Degeneration. Cell Mol Neurobiol 30, 123–135 (2010). https://doi.org/10.1007/s10571-009-9437-8

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