Abstract
Hepatokines and adipokines are secretory proteins derived from hepatocytes and adipocytes,
respectively. These proteins play a main role in the pathogenesis of metabolic syndrome
(MetS), characterized by obesity, dysglycemia, insulin resistance, dyslipidemia, and
hypertension. Adipose tissue and liver are important endocrine organs because they
regulate metabolic homeostasis as well as inflammation because they secrete adipokines
and hepatokines, respectively. These adipokines and hepatokines communicate their
action through different autocrine, paracrine and endocrine pathways. Liver regulates
systemic homeostasis and also glucose and lipid metabolism through hepatokines. Dysregulation
of hepatokines can lead to progression toward MetS, type 2 diabetes (T2D), inflammation,
hypertension, and other diseases. Obesity is now a worldwide epidemic. Increasing
cases of obesity and obesity-associated metabolic syndrome has brought the focus on
understanding the biology of adipocytes and the mechanisms occurring in adipose tissue
of obese individuals. A lot of facts are now available on adipose tissue as well.
Adipose tissue is now given the status of an endocrine organ. Recent evidence indicates
that obesity contributes to systemic metabolic dysfunction. Adipose tissue plays a
significant role in systemic metabolism by communicating with other central and peripheral
organs via the production and secretion of a group of proteins known as adipokines.
Adipokine levels regulate metabolic state of our body and are potent enough to have
a direct impact upon energy homeostasis and systemic metabolism. Dysregulation of
adipokines contribute to obesity, T2D, hypertension and several other pathological
changes in various organs. This makes characterization of hepatokines and adipokines
extremely important to understand the pathogenesis of MetS. Hepatokines such as fetuin-A
and leukocyte cell-derived chemotaxin 2, and adipokines such as resistin, leptin,
TNF-α, and adiponectin are some of the most studied proteins and they can modulate
the manifestations of MetS. Detailed insight into the function and mechanism of these
adipokines and hepatokines in the pathogenesis of MetS can show the path for devising
better preventative and therapeutic strategies against this present-day pandemic.
Keywords metabolic syndrome - hepatokine - adipokine - type 2 diabetes - obesity - hypertension