Thyroid hormone - calcitonin - need clarification

[brood910]

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So, according to EK, thyroid hormones are lipid soluble and work like steroid hormones in a way that they diffuse into nucleus.

However, I found out that calcitonin is made of peptides.
EK doesnt say anything about this, so I am wondering if what Im thinking is true.
Can anyone confirm that calcitonin is a peptide hormone even though its a thyroid hormone? Thx!

 

[dudewheresmymd]

Hey brood, calcitonin is 100% a peptide hormone even though it is released from the thyroid and I remember from EK they mention the thyroid hormones are lipid soluble, but what they really mean is just T3 and T4 are lipid soluble and act as steroid hormones. Just checked my phys textbook and http://en.wikipedia.org/wiki/Calcitonin

 

[brood910]

Hey brood, calcitonin is 100% a peptide hormone even though it is released from the thyroid and I remember from EK they mention the thyroid hormones are lipid soluble, but what they really mean is just T3 and T4 are lipid soluble and act as steroid hormones. Just checked my phys textbook and http://en.wikipedia.org/wiki/Calcitonin

Thanks mate.
I just found out that EK actually mentions about this later on. They should've just mentioned it in the beginning of the chapter when they classified hormones.