Purinergic Signaling Pathway in Human Olfactory Neuronal Precursor Cells

Area of Science:

• Neuroscience
• Stem Cell Biology
• Cell Signaling

Background:

• Extracellular ATP influences multipotent stem cell (MpSC) behavior, but the specific purinergic receptors in human olfactory epithelium-derived stem cells are unknown.
• Human olfactory neuronal precursor cells (hONPC) possess MpSC characteristics, including self-renewal and differentiation potential.

Purpose of the Study:

• To characterize the purinergic signaling pathway in isolated hONPC.
• To investigate the role of P2 receptors in ATP-induced exocytosis and calcium ([Ca2+]i) changes in hONPC.

Main Methods:

• Clonal isolation of hONPC from human olfactory epithelium (hOE) primary cultures.
• Western blot analysis for P2 receptor expression.
• Functional assays using FM1-43 and Fura-2 AM to assess exocytosis and [Ca2+]i dynamics.

Main Results:

• hONPC expressed P2X receptor subtypes 1, 3-5, 7 and P2Y receptor subtypes 2, 4, 6, 11.
• ATP stimulation triggered exocytosis and transient [Ca2+]i increases, primarily mediated by metabotropic P2Y receptors.
• The identified purinergic signaling pathway remained stable in long-term clonal cultures.

Conclusions:

• Functional P2 receptors are expressed in MpSC-like hONPC, regulating exocytosis and calcium signaling.
• This purinergic signaling may mediate paracrine communication within the hOE.
• This study provides the first evidence of a functional purinergic pathway in hONPC.