Tisha,
I’m going to do some looking into this, but whether a substance is acting on “outside” receptors or “inside” receptors doesn’t seem to make much of a logical difference to me. They still bind to receptor sites, and still start chain reactions within the body that lead to changes in real biologic functions, that can lead to behavioral changes. Sure, the receptors are different and cause different reactions, depending on their class and sub-class, binding properties and affinities. But so what? That just means that whatever the pheromone receptors turn out to be, they do indeed provide discrete pathways.
In one example of a pheromone androstadienone causes an increase in cortisol production and an associated change in the endocrine balance in the opposite sex. This substance is also implicated in menstrual cycle syncronicity in cohabitating females.
In another example copulins released by nearby females increase testosterone production in males (copulins).
Androstenols are normally internally circulating adrenal hormones, some small amount of which is excreted in sweat.
Androstenone and aldosterone are steroid hormones, and steroid hormones certainly modulate gene expression in target cells in the body. But that doesn’t mean that excreted andostenone and aldosterone effect the target pheromonic recipient in this way… It totally depends on the binding receptors as to what a substance does. The bound receptors do start the chain reaction. You can think of a hormone/pheromone as being a key that fit two or more different locks. What happens next depends on which lock the key is inserted into and which lockbox is opened.
So, as you can see from a few of the examples above, some of “our” pheromones are also hormones that target and act in the body, as does oxytocin. A few alarmist internet reports notwithstanding, I’m open minded about this hormone oxytocin, which is also sometimes excreted from the body, but mostly acts internally in the host that produces it.
There’s been some talk about research into the trace amine-associated receptors which is a receptor sub-class found within the olfactory epithelium as the potential main receptor site for pheromones. But I believe nothing definitive has been done yet. That is why I wanted and am still hoping a few of the chemists/biologists (or biochemists) on the forum will chime in.
But one thing I think is important to keep in mind is that the science behind pheromones is still in its infancy. There are tons and tons of work to be done, yet. And I think is would be good to keep an open mind. And I think it is erroneous to think that a pheromone can only work if it binds to something in your nose. It is a chemical messenger that affect the behavior of someone other than the person emitting it. And that includes oxytocin in my way of looking at it.
Diane