On the other hand, a cytotoxic leukocyte metabolite can be degraded to diol by sEH, indicating that diols can stimulate the proliferation of MCF-7 cells (ER+PR+HER2-) [
24,
57,
58,
59]. More seriously, inflammatory breast cancer (IBC) is considered to be a rapidly developing and metastasizing type of BC. The degradation of EETs leads to the generation of a proinflammatory microenvironment, which in turn becomes a risk factor for IBC. Hence, it appears that sEH has a further promotional influence on BC. Researchers have found that BCs with different receptor phenotypes have different levels of sEH, implying that epoxide metabolism involved in sEH will have different effects on different subtypes of BC, or even maybe the opposite [
7,
25]. Several pieces of evidence for the sEH influence on different phenotypes of BC have been identified via omics-based pathway analyses [
7]. The study demonstrated that sEH expression is highly positive in HER2+ (75%), ER+PR+ (68%), and triple-positive BC (TPBC) (67%), but the weakest expression appeared in TNBC (46%). Meanwhile, the sEH inhibitory effects are significantly lower in HER2+ (33% strongly positive for sEH) BC, especially compared with TNBC. TNBC maintains the lowest sEH expression, while CYP450, including CYP2C8, 2C9, 2J2, and CYP3A4, exhibits strong expression in TNBC, which is known to promote the conversion of AA, LA, DHA, and EPA into EETs, EpOMEs, EpETEs, and EpDPAs. The EETs derived from these CYP450 have been confirmed to promote invasion and metastasis in TNBC [
54]. Even though TNBC causes sensitive reactions to CYP450 and EETs, a different subtype of TNBC still shows the opposite phenomenon[
7]. TNBC has been reported to be divided into several subtypes, including the mesenchymal-like subtype and basal-like subtype[
60,61,
62,
63]. Depletion of endogenous CYP450 attenuates the metastatic phenotype of mesenchymal-like TNBC cells[
7]. Conversely, CYP2C19 depletion or any compound inhibitor treatment has no significant effect on the migratory and invasive potential of basal-like TNBC cells, and the inhibition of sEH failed to induce significant changes in total EET levels in any of the basal-like TNBC cell lines[
7]. The metastatic and invasive capacity of basal-like TNBC is independent of CYP450. CYP450-mediated EET metabolisms have a stronger correlation with mesenchymal-like TNBC.
The expression or activity of targeted CYP450 has a more effective influence in reducing the metastatic burden of the mesenchymal-like TNBC subtype [
7]. Meanwhile, HER2+ BC is found unaffected by either of the EETs. On the contrary, another study attributed the tamoxifen resistance in MDA-MB-361 (ER−/PR−/HER2+) to overexpression of CYP3A4, partly by enhancing 11,12-EET biosynthesis [
64], while it is mentioned in the study by Maria Karmella Apaya that MCF-7 could not be affected by any EET [
7]. Contradictory evidence reveals the existence of deeper complicated network mechanisms. Of note, sEH maintains a higher expression in hormone receptor-positive BC with the possible production of leukotoxins, further suggesting that sEH may be a key factor in the comorbidity of depression and hormone receptor-positive BC. sEH might promote the growth of BC by degrading epoxides and generating specific toxic diols, particularly in hormone receptor-positive BC.
4. Depression-Associated sEH Promotes Liver Dysfunction and Breast Cancer
As mentioned above, with the increase in depression exploration, extracerebral pathological alterations have been paid more and more attention. As the main organ of lipid metabolism, especially the metabolism of epoxide, the liver has been proposed to have an unexpected connection with brain functions [
65,
66,
67,
68,
69]. The pathogenesis of Alzheimer’s disease (AD) is believed to be closely related to depression [
70,
71]. In particular, major depression and AD share biological processes and pathways, including 77 disease-related genes and 102 pathways [
72]. Amyloid β (Aβ) is one of the vital shared pathogenic targets [
73,
74,
75,
76]. AD has been pointed out to be significantly associated with liver dysfunction [
77]. The liver and kidney are the main extracerebral organs for the clearance of circulating Aβ [
77]. Low-density lipoprotein receptor 1 (LRP-1), which is mediated through the liver, has been shown to regulate multiple tight junction proteins in the blood–brain barrier endothelium [
78]. Studies also showed that those central mechanisms are involved in the neurological and endocrine systems of the brain leading to neuroendocrine regulation of CYP450 gene expression. Such mechanisms have been shown to involve the dopaminergic, noradrenergic, and 5-hydroxytryptaminergic systems of the brain with hypothalamic endocrine centers, among which repetitive restraint stress (RS) increases hepatic CYP2D1/2 activity in a stress-specific manner, while the main effectors of the stress system, glucocorticoids and epinephrine, are highly induced by CYP3A1/2 [
79,
80,
81,
82,
83,
84]. Epinephrine also induces the expression of CYP2C11 and CYP2D1/2. Studies have shown that human hepatocyte microsomes are the primary site of systemic CYP450, sEH-mediated epoxide metabolism [
85]. This discovery further supports the importance of hepatocyte epoxide metabolism in depression–BC comorbidity.
Researchers also disclosed that psychiatric disorders induce liver dysfunction [
77]. A study found that sEH in the livers of chronically stressed experimental animals increased specifically without its appearance in other organs and caused nonspecific changes in LOX and COX signaling pathways [
86]. Furthermore, the specific knockdown of the hepatic sEH gene Ephx2 suppressed the expression of the depression-like phenotype. Moreover, the important hydrolase is predominantly expressed in hepatocytes [
86]. The evidence suggests that hepatic sEH is one of the main causative factors of psychiatric disorders including depression. Additionally, sEH has been raised as the critical molecule in the brain–liver axis, with a positive correlation between sEH protein in the parietal cortex and sEH protein in the liver [
87]. Thus, the downstream effects of hepatic epoxide metabolism, including inflammation, liver dysfunction, and lipid metabolisms, may be components of contributors to BC.
The effects of depression on the liver are known to be reflected in inflammation, oxidative damage, and reduced immune surveillance [
65,
69,
88]. From the perspective of molecular mechanisms, the upregulation of hepatic sEH is one of the pivotal upstream causes of liver damage, liver fibrosis, and hepatitis [
65,
89,
90,
91]. The inhibition of hepatic sEH significantly reduces endoplasmic reticulum stress in hepatocytes and maintains low expression of prostaglandins and triglycerides, thereby reducing high-fat-diet-induced inflammation [
92]. A notable observation is that overexpression of hepatic sEH increases liver triglyceride levels and hepatic inflammatory response [
65,
69].
Surprisingly, the induced expression of sEH in the liver only occurred in a long-term rather than short-term high-fat diet. Furthermore, sEH inhibition attenuates the high-fat-diet-induced plasma levels of proinflammatory cytokine increase and the adipocytic cytokine mRNA upregulation. It is thus clear that depression promotes specific upregulation of hepatic sEH, which is a potential inflammatory injury factor in the liver [
92,
93]. What is more, overexpression of sEH in the liver directly affects the balance of epoxide metabolism. The pathological changes in the liver are crucial to the disruption of the internal environmental homeostasis, which provides a potentially favorable environment for the development of BC.
Another noteworthy point is that ω-6 PUFAs and ω-3 PUFAs, as the precursors of DHA, EPA, AA, and LA, are clearly involved in the pathogenesis of depression [
94]. Studies have shown that ω-3 PUFAs exert anti-inflammatory effects in the brain by regulating microglia function to maintain homeostasis, which improve fatty acids for the pathogen. At the same time, ω-6 PUFAs have been considered as promoting factors of inflammation, while the ability of dietary LA to increase the levels of inflammatory markers is influenced to some degree by the level of adiposity [
94,
95]. The ratio of ω-6 PUFAs/ω-3 PUFAs is considered to affect the balance of lipid metabolism [
95,
96]. A Mediterranean diet with high ω-3 PUFA levels has been mentioned to alleviate depressive symptoms and even decrease the prevalence of malignancies such as breast, lung, prostate, and colorectal cancers [
97,
98]. In addition, ω-3 PUFAs have been found to attenuate microglia-induced inflammation by inhibiting the HMGB1/TLR4/NF-κB pathway [
99].
It has also been shown that an unhealthy diet can lead to obesity, which is highly correlated with a chronic inflammatory environment and depression. A high ratio of ω-6 PUFAs/ω-3 PUFAs has been demonstrated to be an unhealthy dietary pattern [
100,
101]. Western diets, another popular diet construction, show a high ω-6 PUFAs/ω-3 PUFAs ratio of 15/1 to 16.7/1 [
100,
102]. Western diets have been shown to induce hyperthrombotic and proinflammatory states [
101,
103,
104,
105,
106]. ω-6 PUFAs and ω-3 PUFAs can be converted into EPA, DHA, AA, and LA after ingestion, which can be further converted into EETs, EpOMEs, EpETEs, and EpDPAs. This shift suggests that the Western diet promotes an imbalance in lipid metabolism, which leads to a range of proinflammatory and carcinogenic effects [
22,
23,
107]. In addition, the dietary structure of high ω-6 PUFAs/ω-3 PUFAs is conducive to the growth and development of BC. Studies have discovered that LA is the most abundant polyunsaturated fatty acid in the Western diet [
95,
96], where the consumption of butter, corn oil, the rice plant (
Oryza Sativa L.), and soybeans leads to significantly increased hepatic LA consumption and promotes LA metabolism via CYP450 (mainly by CYP2J2, CYP2C8, and CYP2C9) to produce 9, 10-EpOME (leukotoxin) and 12, 13-EpOME (isoleukotoxin) [
108,
109,
110,
111,
112,
113]. Another important fact is that stress is reported to induce the hepatic PXR expression, which is followed by induced hepatic CYP3A and CYP2C expression [
81]. Therefore, the response of high dietary ω-6 PUFAs to depression results in high sEH expression promoting the production of 9, 10-DiHOME (leukotoxin diol) and 12, 13-DiHOME (isoleukotoxin diol) [
55,
82]. In addition, a high ω-6 PUFAs/ω-3 PUFAs diet may increase breast cancer risk [
114,
115,
116,
117]. Moreover, it has been shown that LA promotes the proliferation of MDA-MB-231 breast cancer cells by activating the EGFR/PI3K/Akt signaling pathway [
118,
119]. Meanwhile, AA has been found to have a similar effect as well [
119]. It is worth noting that excessive LA intake has been implicated in the development of obesity and liver dysfunction [
120,
121,
122,
123,
124,
125,
126]. This effect is fatal to BC patients, especially BC with obesity. Basically, hepatic sEH-mediated epoxide metabolism is an important mechanism by which the liver regulates the comorbidity of depression and BC.
Under the stimulation of chronic depression, chronic stress leads to the continuous increase in inflammatory cytokines leading to chronic persistent inflammation. Although the hypothalamic–adrenal axis is one of the important regulatory pathways of chronic inflammation induced by chronic stress, sEH-mediated epoxide metabolism is also an important regulatory pathway [
83]. This is because EETs degraded by sEH are also important contributors to the creation of a proinflammatory endotrophic environment. Fatty liver has been identified as consistent with increased neuro-proinflammatory cytokines and amyloid β deposition in the brain of mice induced by a high-fat diet [
127]. Thus, abnormal lipid metabolism and hepatic inflammation mediated by disturbances in hepatic epoxide metabolism are directly related to neuroinflammation and pathological alterations in amyloid β in the brain. Importantly, sEH upregulation increases EET degradation and promotes cytokine expression. A study illustrated that dual inhibitors of sEH and COX-2 improved hepatic fibrosis and portal hypertension and downregulated IL-6 levels, suggesting that IL-6 plays a driving role in hepatitis [
128]. The prevalence of nonalcoholic fatty liver diseases (NAFLD) in patients with breast cancer is significantly higher than in healthy controls, while hepatic sEH is a key enzyme for NAFLD [
129]. Moreover, breast cancer patients with NAFLD showed poorer prognosis in terms of recurrence [
129,
130].
In addition, as mentioned earlier, depression-mediated neuroinflammation is associated with IL-6, and there is also a positive relationship between this interleukin and the construction of TME in BC [
131]. Therefore, IL-6-related pathways may be one of the downstream pathological developmental pathways of epoxide metabolic disorders. Currently, several studies are aimed at blocking the IL-6 receptor and its downstream signaling molecules to develop BC-related therapeutic regimens [
29,
132]. Generally, systematic chronic inflammation is a beneficial environment for BC development, which is tightly connected with adipose issues (especially cancer-associated adipocytes) [
132,
133,
134,
135,
136]. This review points out that another potential target, blocking hepatic sEH rather than breast tissue sEH, might be a suppressor in partially comorbid BC and depression populations.
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