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Holmes, S. E.

Publications and source records attributed to Holmes, S. E..

2 recordsLinked to original sources

Computational Design of Two New 5-HT1B Serotonin Receptor Agonists Derived from Naratriptan

Migraine headaches affect over one billion people internationally and can be defined as episodes of acute severe pain wrapping around the head and are normally accompanied by nausea, blurry vision, and sensitivity to light and sound. While triggers that cause migraines may vary among patients, evidence shows they are involved with the trigeminovascular system (a network of blood vessels in the brain in conjunction with the trigeminal nerve). Activation of the trigeminal neurons triggers the release of vasoactive neuropeptides, such as calcitonin gene-related peptide (CGRP), leading to neurogenic inflammation and vasodilation of cranial blood vessels. The development of 5-HT1B serotonin agonist drugs, commonly known as triptans, have been an effective measure of migraine relief. The drugs created in this research were found to have improved docking scores within the 5-HT1B binding site compared to that of naratriptan. The two drugs proposed in this paper would need to undergo further investigation to determine the feasibility of laboratory synthesis and clinical trials.

pharmacology and toxicology↗

Optimized reference region and the effect on test-retest reliability and detection of Parkinson's disease with UCB-J.

[11C]UCB-J is a radioligand targeting synaptic vesicle glycoprotein 2A, used to image synaptic density. For quantification, a small-volume centrum semiovale area was previously optimized as a [11C]UCB-J reference region (CS2mL); however, its high variability resulted in reduced reliability. Herin, we evaluated an alternative reference region method to assess longitudinal test-retest reliability and detection of Parkinsons disease (PD). For estimating distribution volume ratio (DVR), CS2mL and eleven white matter (WM) reference regions (range: 0.5-200 mL) were generated using the Freesurfer WM map. Same-day and longitudinal test-retest variability (TRV) were assessed (24 healthy subjects (HS); n=10 same-day and n=20 longitudinal HRRT scans, range: 7-1028 days). Each reference region was used to evaluate the substantia nigra (SN) and caudate DVRs in HS (n=25) and PD (n=20). The 10mL WM reference region yielded [11C]UCB-J DVR measurements with reduced variability in TRV (same-day: 10mL: 1.2{+/-}5.7%, same-day: CS2mL: -0.9{+/-}9.2% longitudinal: 10mL: 1.5{+/-}7.0%, CS2mL: 1.6{+/-}11.9%,) while maintaining <10% volume of distribution difference, compared to CS2mL. Further, a significant difference between PD and HS groups in SN and caudate DVRs was found using 10mL, with greater effect size (Cohens d 0.61 for SN and 0.66 for caudate) compared to CS2mL (0.38 for SN and 0.43 for caudate).

neuroscience↗