What question did this study set out to answer?

To determine how conformational modifications at positions 3 and 6 of GnRH analogues affect pituitary receptor binding affinity and direct antiproliferative effects in breast cancer cells.

December 1, 2005Journal of Peptide Research

GnRH analogues containing conformationally restricted amino acids in positions 3 and 6: differential impact on pituitary binding affinity and direct antiproliferative effect on breast cancer cells†

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Authors

AZAikaterini A. ZompraUniversity of Patras VMVassiliki MagafaUniversity of Patras FLFotini N. LamariUniversity of Patras

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Implication

In vitro study reveals differential receptor binding and antiproliferative activity of novel GnRH analogues in breast cancer cells, suggesting distinct tumor-targeting potential.

Key Points

To determine how conformational modifications at positions 3 and 6 of GnRH analogues affect pituitary receptor binding affinity and direct antiproliferative effects in breast cancer cells.
Synthesized eight novel GnRH analogues featuring a Pro9-ethylamide modification and lacking the Gly10-amide residue.
Substituted Gly6 with dialkyl amino acids (Aib, Deg) and Trp3 with D-Trp, D-Tic, or L-Tic.
Evaluated GnRH receptor binding affinity in mouse anterior pituitary αT3-1 cells and antiproliferative activity in human MCF-7 breast cancer cells.
[Aib6,desGly10]GnRH-NHEt bound to mouse pituitary GnRH receptors with IC50 values comparable to native GnRH, whereas position 3 modifications broadly reduced affinity, except for [L-Tic3,Deg6,desGly10]GnRH-NHEt which maintained high pituitary binding affinity.
All novel analogues except [Aib6,desGly10]GnRH-NHEt significantly inhibited MCF-7 human breast cancer cell proliferation, whereas parent GnRH showed no significant inhibition.
Analogues modified at position 3 produced the highest direct antiproliferative efficacy against MCF-7 cells.

Cite This Study

Zompra et al. (2005) studied this question.

synapsesocial.com/papers/6a8bfdb5c716e89f35df086f https://doi.org/10.1111/j.1747-0285.2006.00346.x

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Implication

In vitro study reveals differential receptor binding and antiproliferative activity of novel GnRH analogues in breast cancer cells, suggesting distinct tumor-targeting potential.

GnRH analogues containing conformationally restricted amino acids in positions 3 and 6: differential impact on pituitary binding affinity and direct antiproliferative effect on breast cancer cells†

Discussion

Member takes

Implication

Key Points

Cite This Study

GnRH analogues containing conformationally restricted amino acids in positions 3 and 6: differential impact on pituitary binding affinity and direct antiproliferative effect on breast cancer cells†

Discussion

Member takes

Implication

Key Points

Cite This Study

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