Rexahn Pharmaceuticals Inc.

Serdaxin’s mechanism of action (MOA)

Serdaxin works in the pre-synaptic area and targets key proteins involved in the machinery of vesicle release to increase the availability of serotonin and dopamine. This mechanism of action is a significant departure from SSRI and SNRI anti-depressants that inhibit the re-uptake of serotonin and do not affect dopamine levels.

Serdaxin is a dual enhancer of serotonin and dopamine (the “SERDA” mechanism)

In contrast to anti-depressants on the market that block re-uptake of neurotransmitters, Serdaxin directly increases the concentration of neurotransmitters –both serotonin and dopamine — by interacting with proteins that are important for neurotransmitter vesicle trafficking and fusion.

The SERDA mechanism at work in treating depression.

The SERDA mechanism at work in treating depression

Studies establishing Serdaxin’s novel MOA:

Studies establishing Serdaxin's novel MOA

* Published data [http://dx.doi.org/10.1016/j.neulet.2011.09.032]

Importance of dual enhancement in the treatment of depression

There are two mood states in humans: positive and negative mood. Recent body of research strongly suggests that the loss of positive mood, negative mood or a combination of both results in depression. Depression resulting from a negative mood state may be treated with serotonin-based anti-depressants, whereas depression resulting from a loss of positive mood may be treated with a dopamine-based regimen. However, due to the complicated nature of depression, it would be optimal to employ a therapeutic that effects both serotonin and dopamine activities, addressing the causes of negative mood as well as the causes of loss of positive mood. This would lead to increased response/remission and improvement in patient compliance.

Caption: Serdaxin is positioned to be the first therapeutic that enhances the release of both serotonin and dopamine simultaneously in the brain, and address the significant un-met medical needs in the treatment of depression.

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