>>prev written in response to my posting:
>>>>>>>>This is not true at all. While steroid hormones are membrane soluble and
>>>act on receptors that are transcription factors, the peptide hormones
>>>(growth hormone, ACTH, insulin) and amino acid derivatives (serotonin,
>>>dopamine, epinephrine) all work through membrane-bound receptors.
>>>>what is not true at all? there is obviously a diff between steroid and
>>peptide hormones, but what i said obviously holds true for steroid hormones.
Not necessarily, there is quite a bit of evidence that some cytokines may be
translocated to the nucleus, following binding to their receptor, so making
distinctions between hormones on this basis may not hold.
Steve Hopkins
