The Peptide CommonsEst. May 2024
Independent. We sell nothing and are affiliated with no manufacturer or pharmacy. Every moderation action is logged in public
Topic summary

Biased agonism: a real phenomenon, an over-used explanation — what changed since

This is a generated summary. It shows the 8 most-liked posts from a topic of 57, in their original order, with the accepted answer included where one exists. It is a reading aid and it will miss nuance — the full topic is the record.
AP
a.petrovTL218 Dec 2024#7

Worth separating two things that post #3 runs together.

Biased agonism — where different ligands at the same receptor favour different downstream pathways — is a plausible explanation for differences between compounds in this class and is not a demonstrated one for any specific pair.

25 likes 19mo
ID
il.dumitruTL229 Dec 2024#14

Useful. I had the fact and not the reason, which turns out to be the important half.

23 likes 19mo
EF
erratum_fileTL3Regular16 Jan 2025#27
Okafor, post #13: Building on post #12 rather than restating it. Central versus peripheral action: GLP-1 agonism works through both central nervous system effects (appetite) and peripheral effects (gastric motility, insulin). The balance is not fully characterised. Go to post

I had written a reply contradicting post #23 and deleted it. Here is what survived.

Ghrelin receptor agonism drives growth hormone release in pulses and also increases appetite, which is the effect people most reliably report and least often want.

24 likes in reply to #13 18mo
IG
in.guerreroTL220 Jan 2025#30

Post #27 answers the question as asked. The question underneath it is different.

Biased agonism: I would want to see the raw numbers rather than the summary before agreeing. Summaries lose exactly the information that would settle this.

25 likes 18mo
HF
h.falkTL228 Jan 2025 · edited#36

Coming back to post #32, because the follow-up matters more than the original answer.

Biased agonism — where different ligands at the same receptor favour different downstream pathways — is a plausible explanation for differences between compounds in this class and is not a demonstrated one for any specific pair.

I have no interest in any supplier named above.

27 likes 18mo
SZ
s.zamoraTL21 Feb 2025#40

The strongest argument against my own position on Biased agonism, stated as well as I can state it, since nobody else has yet.

20 likes 18mo
RM
r.marsdenTL3Regular14 Feb 2025#51
h.krastev, post #47: Post #45 describes the usual case. This is about the unusual one. The version of Biased agonism that circulates here is a simplification of a simplification. It is not wrong, but it has lost the conditions under which it holds, and those conditions are where the interesting cases live. Go to post

The useful distinction on Biased agonism is between what was measured and what was inferred from it. Both end up in the same sentence and only one of them has error bars.

21 likes in reply to #47 17mo
KF
k.farrugiaTL3Regular18 Feb 2025#55

Fine by me. I had wanted a stronger conclusion and there is not one available.

29 likes 17mo

Read the full topic (57 posts)

Suggested topics

TopicParticipantsRepliesViewsActivity
Why appetite effects are mostly central
Why appetite effects are mostly central I have a specific reason for asking rather than idle curiosity, and the context is below. Appetite effects: what I expected, what I found, and the gap between them. I…
EKHFSB 2 56k 16mo
Follow-up: Why appetite effects are mostly central
Asking directly, because I could not find a straight answer: Why appetite effects are mostly central A follow-up question about appetite effects that I did not know to ask the first time. The earlier thread…
CRRWMHKMN+86 90 61k 9mo
Vagal afferents and the gut-brain pathway
On the subject in the title: Vagal afferents and the gut-brain pathway Working notes rather than a conclusion. Vagal afferents — I have the observation and I do not trust my interpretation of it, so I am…
KRBSKSBCD+5 9 44k 13mo
GIP receptor agonism and the argument about direction
GIP receptor agonism and the argument about direction — setting out what I have, and where I think it stops being reliable. A question about GIP receptor agonism that I think has a definite answer, unlike…
ACQZES 2 867 10mo
Amylin receptor signalling and satiety — what changed since
On the subject in the title: Amylin receptor signalling and satiety — what changed since Working notes rather than a conclusion. What changes if the standard account of Amylin receptor signalling and satiety…
GCCNRCBPB+73 78 3.5k 2mo

Related topics — sharing the tags amylin analogues, tirzepatide, retatrutide

TopicParticipantsRepliesViewsActivity
Why a glucagon receptor agonist in a weight-loss compound is not a contradiction — one year on
Why a glucagon receptor agonist in a weight-loss compound is not a contradiction — one year on — that is the question, and I have not found it answered plainly anywhere I have looked. The question about…
EHSBBOARB+3 7 1k 2mo
Follow-up: The lowest dose that does anything: is that a real question?
The question in the title: The lowest dose that does anything: is that a real question? I will give what I have already checked below so nobody repeats it. I have read the maintained page on this and I still…
SCYAJWEHYM+70 75 12k 8mo
Spreadsheets: an appreciation
On the subject in the title: Spreadsheets: an appreciation Working notes rather than a conclusion. A methods question rather than a substantive one, about spreadsheets. Everyone quotes the same figure and I…
ONJAVFAACA+26 30 25k 2.1y
Clearance pathways and what renal impairment changes
Clearance pathways and what renal impairment changes Writing it up because I had to work it out twice and would rather nobody else did. What changes if the standard account of clearance pathways is wrong? I…
BAWADAKLS+11 15 43k 2mo
Peak-to-trough ratio at steady state for a weekly agent
On the subject in the title: Peak-to-trough ratio at steady state for a weekly agent Working notes rather than a conclusion. Working through the kinetics rather than the pharmacology, because I think the…
SMVNICPAJH+58 64 9.7k 2mo