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17β-estradiol modulates NGF and BDNF expression through ERβ mediated ERK signaling in cortical astrocytes

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Abstract

17β-estradiol is known to exert neurotrophic and neuroprotective effects through classical estrogen receptors [ERs], ERα and ERβ, on a variety of cell types either by genomic or non-genomic actions. The actions of estradiol on glial cells are important to maintain metabolic functions of the nervous system. Astrocytes are considered to be active participants in brain activity because of their ability to release growth factors, including neurotrophins. Present in vitro studies show that 17β-estradiol modulates NGF and BDNF expression in time-dependent manner and ERK acts as secondary messenger for estradiol’s action. 17β-estradiol is involved in survival of cortical astrocytes. In conclusion, this study indicates vital role of ERβ mediated ERK signalling for regulation of NGF and BDNF expression along with cell viability of cortical astrocytes which further confirms the role of ERs, particularly ERβ in glial cells’ functions and viability.

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Fig. 1: Dissociation of 0–2 day old neonatal rat cortex yields predominantly GFAP positive astrocytes in primary culture following fibroblast removal.
Fig. 2: Effect of 17β- Estradiol on NGF and BDNF mRNA levels in rat cortical astrocytes cultures:
Fig. 3: ERK involvement in E2 mediated modulation of NGF and BDNF transcript levels:
Fig. 4: Modulatory effect of E2 and its receptors on p-ERK1/2
Fig. 5: ERα and ERβ mediated cell viablity:
Fig. 6: Role of ERK in E2 treated astrocytes cell viablity:

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Abbreviations

E2:

17β-estradiol

ERs:

Estradiol Receptors

ERα:

Estradiol Receptor alpha

ERβ:

Estradiol Receptor beta

NGF:

Nerve growth factor

BDNF:

Brain derived neurotrophic factor

NT3:

Neurotrophins 3

NT4/5:

Neurotrophins 4/5

ERK:

Extracellular regulated kinase

MEK:

Mitogen activated protein kinase

GFAP:

Glial fibrillary acidic protein

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Acknowledgments

The authors are highly thankful to the Animal House Facility, Department of Biochemistry, The Maharaja Sayajirao University of Baroda, Vadodara. Authors are also very thankful to DBT-ILSPARE Programme, for the Confocal microscope facility at Dr. Vikram Sarabhai Science Block, Faculty of Science, The Maharaja Sayajirao University of Baroda, Vadodara.

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Correspondence to Prakash P. Pillai.

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Animal ethical approval

All animal experiments were in compliance with the ethical committee approved by the Institutional Animal Ethical Committee, The Maharaja Sayajirao University of Baroda; ZD/02/2013, 2014, 2015.

Conflict of interest

The authors declare that they have no conflict of interest.

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Langhnoja, J.M., Buch, L.K. & Pillai, P.P. 17β-estradiol modulates NGF and BDNF expression through ERβ mediated ERK signaling in cortical astrocytes. Biologia 73, 907–915 (2018). https://doi.org/10.2478/s11756-018-0099-1

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  • DOI: https://doi.org/10.2478/s11756-018-0099-1

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