Increasing evidence indicates that production of new neurons in the adult brain is important for behavior, brain repair, and response to therapies. Aging is associated with a profound decline in production of new neurons and decreased neurogenesis may be related to the impaired functioning of the aging brain. This decrease may be due to several factors including changes in the division of stem and progenitor cells, survival of stem cells or their progeny and altered fate of the stem cell progeny. To understand the mechanism of age-related decline in adult neurogenesis it is necessary to identify the changes in the main parameters of the division/ differentiation cascade in the aging brain. We developed an experimental platform that combines reporter mouse lines, lineage tracing techniques, precise quantitation and computational modeling to determine changes in stem cells division and fate. We used this approach to determine the neurogenic targets of antidepressant treatments and of brain injury. Furthermore, we will combine genetic stem cell analysis with a new technology of unparalleled sensitivity and accuracy, Multi-Isotope Imaging Mass Spectroscopy (MIMS), for the quantitative analysis of stem cells turnover and fate in the aging brain. Since our reporter mouse lines mark stem and progenitor cells in several non-neuronal tissues, we are in a position to analyze the same individual animals for parallel changes in several stem cell compartments. The main goal of this proposal is to apply stringent quantitative methods to the problem of stem cell lineage and to determine the changes in the turnover rates and the lineages of stem cells in response to aging, antidepressant therapies and injury.
In Aim 1 we will use reporter lines, single- and double-label pulse chase analysis, computational modeling and MIMS to determine age-related changes in the parameters of the division/differentiation cascade of neural stem and progenitor cells in the dentate gyrus of the hippocampus.
In Aim 2 we will use multi-allelic reporter lines, Cre-based lineage tracing, and MIMS to determine age-related changes in the fate of stem cells.
In Aim 3 we will apply genetic fate mapping and MIMS to determine the age-associated changes in the parameters of the division/differentiation cascade and in the fate of stem cells in response to antidepressant treatments of different modalities (fluoxetine, electroconvulsive shock and exercise) and to injury that induces depressive behavior (ablation of dopaminergic neurons). Finally, in Aim 4, we will use genetic fate mapping and MIMS to determine changes in the turnover and fate of stem/progenitor cells in a range of non-neuronal tissues that are marked by reporter gene expression in our multi-allelic reporter lines. Together, our results and genetic tools will provide a framework for studying division and differentiation of stem cells and tissue turnover as an integrated quantitative endeavor.
Aging is associated with diminished ability of tissues and organs to regenerate. Since stem cells play a key role in regeneration and repair, it is important to understand what happens to stem cells during aging, why they often produce less progeny, and whether their fate changes with age. In our proposal we combine genetic, computational, and spectroscopic approaches to determine how the aging changes capacity of stem cells to divide and produce differentiated progeny and how it affects the response to antidepressant therapies.
|Shuvaev, Sergey A; Lazutkin, Alexander A; Kedrov, Alexander V et al. (2017) DALMATIAN: An Algorithm for Automatic Cell Detection and Counting in 3D. Front Neuroanat 11:117|
|Saboor, Farhan; Reckmann, Ansgar N; Tomczyk, Claudia U M et al. (2016) Nestin-expressing vascular wall cells drive development of pulmonary hypertension. Eur Respir J 47:876-88|
|Koning, Jasper J; Konijn, Tanja; Lakeman, Kim A et al. (2016) Nestin-Expressing Precursors Give Rise to Both Endothelial as well as Nonendothelial Lymph Node Stromal Cells. J Immunol 197:2686-94|
|Barykina, Natalia V; Subach, Oksana M; Doronin, Danila A et al. (2016) A new design for a green calcium indicator with a smaller size and a reduced number of calcium-binding sites. Sci Rep 6:34447|
|Matlashov, Mikhail E; Bogdanova, Yulia A; Ermakova, Galina V et al. (2015) Fluorescent ratiometric pH indicator SypHer2: Applications in neuroscience and regenerative biology. Biochim Biophys Acta 1850:2318-28|
|Enikolopov, Grigori; Overstreet-Wadiche, Linda; Ge, Shaoyu (2015) Viral and transgenic reporters and genetic analysis of adult neurogenesis. Cold Spring Harb Perspect Biol 7:a018804|
|Makaryus, Rany; Lee, Hedok; Feng, Tian et al. (2015) Brain maturation in neonatal rodents is impeded by sevoflurane anesthesia. Anesthesiology 123:557-68|
|Smagin, Dmitry A; Park, June-Hee; Michurina, Tatyana V et al. (2015) Altered Hippocampal Neurogenesis and Amygdalar Neuronal Activity in Adult Mice with Repeated Experience of Aggression. Front Neurosci 9:443|
|Enikolopov, G; Guillermier, C; Wang, M et al. (2014) Brain stem cell division and maintenance studied using multi-isotope imaging mass spectrometry (MIMS). Surf Interface Anal 46:140-143|
|Saiardi, A; Guillermier, C; Loss, O et al. (2014) Quantitative imaging of inositol distribution in yeast using multi-isotope imaging mass spectrometry (MIMS). Surf Interface Anal 46:169-172|
Showing the most recent 10 out of 21 publications