Give at least one example of an interaction between the endocrine system and the immune system?

This is the concept of immunoendocrinology.A pratical example is the interaction between pineal gland(endocrine gland) and immune system. Pineal gland  secrets melatonin.(hormone that regulate sleep-wake cycle) ,

Evidence has shown that interleukin 1 beta  inhibits secretion of melatonin by the pineal gland through  suppression of arylalkylamine-N-acetyltransferase (AA-NAT) protein expression which lead to  inhibition of melatonin secretion.

The activities of small non coding RNA molecules-Micro-RNAs in exerting effects on the biological process at different levels is another example. These RNAs have effects on the autoimmune diabetes.

 Specifically Micro-RNAs exerts  functional regulatory  effects at  cells,tissues, organs levels between the pancreatic beta cells and the immune systems. Thus the interaction provided by these RNA plays a major role in understanding the effects of relationship between the immune systems and beta cells of the pancreas for autoimmune diabetes

Explanation:

wellness is an overall state of well-being. the quality or state of being healthy in body and mind, especially as the result of deliberate effort