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 Table of Contents  
REVIEW ARTICLE
Year : 2020  |  Volume : 32  |  Issue : 4  |  Page : 305-311

The role of transcription factor caudal-related homeobox transcription factor 2 in colorectal cancer


1 Division of Colorectal Surgery, Dalin Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Chiayi; College of Medicine; School of Post-Baccalaureate Chinese Medicine, Tzu Chi University, Hualien, Taiwan
2 Division of Colorectal Surgery, Dalin Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Chiayi; College of Medicine, Tzu Chi University, Hualien, Taiwan
3 School of Post-Baccalaureate Chinese Medicine, Tzu Chi University, Hualien; Department of Chinese Medicine, Dalin Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Chiayi, Taiwan
4 Department of Biomedical Sciences and Institute of Molecular Biology, National Chung Cheng University, Chiayi, Taiwan

Date of Submission27-Mar-2020
Date of Acceptance06-May-2020
Date of Web Publication24-Jul-2020

Correspondence Address:
Dr. Chin-Chia Wu
Division of Colorectal Surgery, Dalin Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, 622, Minsheng Road, Dalin Township, Chiayi
Taiwan
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/tcmj.tcmj_49_20

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  Abstract 

Colorectal cancer (CRC) is one of the most malignant tumors in humans and causes mass mortality. In the age of precise medicine, more and more subtypes of CRC were classified. The caudal-related homeobox transcription factor 2 (CDX2) is an intestine-specific transcription factor which is implicated in differentiation, proliferation, cell-adhesion, and migration. The loss of CDX2 in immunohistochemical stain was reported to be a prognostic factor of colon cancer, but the clinical application remained controversial. Most of the CRCs expressed or over-expressed CDX2. Homeobox genes can display either an oncogenic or a tumor-suppressing activity. CDX2 regulates the developing intestinal epithelium and CRC by different pathways. The complex regulation of CDX2 and its complex targets cause the difficulties of application for CDX2 in the prediction of prognosis. However, CDX2 is a potential biomarker applied in the precise classification of CRC for personalized medicine. This review partially clarifies the role of CDX2 in CRC.

Keywords: Cancer biomarker, Caudal-related homeobox transcription factor 2, Colorectal cancer


How to cite this article:
Wu CC, Hsu TW, Yeh CC, Huang HB. The role of transcription factor caudal-related homeobox transcription factor 2 in colorectal cancer. Tzu Chi Med J 2020;32:305-11

How to cite this URL:
Wu CC, Hsu TW, Yeh CC, Huang HB. The role of transcription factor caudal-related homeobox transcription factor 2 in colorectal cancer. Tzu Chi Med J [serial online] 2020 [cited 2020 Nov 25];32:305-11. Available from: https://www.tcmjmed.com/text.asp?2020/32/4/305/290670


  Introduction Top


Colorectal cancer (CRC) is the most common malignant tumor worldwide with increased incidence recently[1]. The CRC is primarily treated by surgical resection and adjuvant treatment, such as chemotherapy and radiation. Although tumor-node-metastasis staging system helps us to predict the prognosis and to decide optimal adjuvant therapy for CRC[2], the outcome is variable within the same cancer stage due to the heterogeneity of the molecular alterations[3]. Carcinogenesis of the colon epithelium is composed of several slowly-accumulated genetic mutations and epigenetic changes, leading to gain-of-function mutations in oncogenes or loss-of-function mutations in tumor-suppressor genes[4].

Several molecular and genetic signatures were used for precise cancer treatment nowadays, including CRC[5]. Due to the heterozygosity of cancers and their behaviors, to identify specific cancer types and to treat them individually are important[6]. Based on their pathogenesis and molecular characteristics, CRCs have been categorized into different subtypes[7].

The Caudal-type homeodomain transcription factors 2 (CDX2) has been reported to be a tumor suppressor and a prognostic factor in CRC[8],[9]. CDX2 determines the development of intestine since the morula stage[10]. The expression of CDX2 in adults is restricted to the intestine from the duodenum to the rectum. Therefore, CDX2 can serve as a marker of intestinal origin[11]. Currently, the immunohistochemical (IHC) stain of CDX2 is broadly used to identify the metastatic lesions like intestine-origin[11],[12]. Although some meta-analyses have indicated that the IHC stain of CDX2 may be a potential prognostic factor of colon cancer [13],[14],[15], the clinical application of the CDX2 as a biomarker remains controversial[16]. The reasons arise from the low rate of CDX2 silencing (2%–10%) in CRC[11].

More and more studies have revealed that CDX2 is a potential prognostic factor of CRC. However, the functions of CDX2 are not unveiled clearly in CRC. Salari et al. reported that CDX2 overexpressed in CRC cell lines [Supplemental Materials] is highly linked with cell growth and survival[17]. The regulation mechanism of CDX2 expression is complex and coexisted with many transcription factors. In this review, we went over the published literature and tried to clarify the role of CDX2 in CRC.


  Cdx2gene and Caudal-Related Homeobox Transcription Factor 2 Protein Top


The human Cdx2 gene is localized to chromosome 13q12–13. CDX2 protein functions as a transcription factor[18]. It contains homeodomain protein structure, consisting of a 60-amino acid sequence folded into a domain with three-alpha helixes. The helix 2 and helix 3 form a helix-turn-helix structure that binds to the major groove of a specific DNA sequence through hydrogen bonds and hydrophobic interactions. Homeodomain proteins show a preference for interaction with the DNA sequence 5'-TAAT-3'[19]. The homeodomain proteins are tissue specific and regulate different functions. The expression of CDX2 protein distributes from the duodenum to rectum[20],[21]. CDX2 is initially presented in the early development, which is essential for the correct intestinal development and differentiation[22]. Aberrant expression of CDX2 leads to pathogenic outcomes, such as gastric or esophageal intestinal metaplasia[23],[24] and acute myeloid leukemia[25].


  Genetic Alterations of Caudal-Related Homeobox Transcription Factor 2 in Colorectal Cancer Top


According to Olsen's review, there were no significant associations of CDX2 with increased risks of CRC in the germline and somatic level[16]. The CDX2 DNA polymorphism was not independently associated with either colon or rectal cancer[26],[27]. Some haplotypes were associated with more advanced disease, but not correlated with increased risks of CRC[28]. Although the locus of Cdx2 gene on 13q12.2 was reported to be a target of the amplification, it is possible to be a lineage-survival oncogene deregulated in CRC[17]. The Cdx2 gene is not frequently mutated or lost[29]. The rearrangements are correlated with Cdx2 gene amplification but are not predictive of the CDX2 protein[30]. This finding hinted that the CDX2 protein was not mainly regulated by alterations of Cdx2 gene.


  Caudal-Related Homeobox Transcription Factor 2 Plays Different Roles in Embryo, Intestinal Epithelium, and Colorectal Cancers Top


The pluripotent stem cell could be induced to differentiate into hindgut tube formation by CDX2[31]. Loss of Cdx2 results in failure to downregulate Oct4 and Nanog in outer cells of the blastocyst and subsequent failure of gut development [Figure 1]a[32]. During embryogenesis, the function of CDX2 is to regulate the proliferation-promoting genes.
Figure 1: Caudal-related homeobox transcription factor 2 plays different roles in embryo, intestinal epithelium and colorectal cancers. (a) In blastocyst, caudal-related homeobox transcription factor 2 determines the gut development by downregulation of Oct 4 and Nanog. In the intestinal epithelial cell, caudal-related homeobox transcription factor 2 could both promote and inhibit proliferation to maintain the renewal of the intestinal epithelium. (b) In the colorectal cancer cells, caudal-related homeobox transcription factor 2 downregulates the Wnt pathway and prevents G1-S cell cycle transition. Overexpression of caudal-related homeobox transcription factor 2 decreases the epithelial mesenchymal transition. Caudal-related homeobox transcription factor 2 protein binds to ATM and prevents DNA double strand break repair in colorectal cancer cells

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In the non-cancer intestinal epithelial cell, the CDX2 can modulate the proliferation for maintaining the renewal of intestinal epithelium. In a porcine intestinal epithelial model (porcine jejunum epithelial cell line-J2), the expression of CDX2 leads to proliferation[33]. In the human intestinal epithelial crypt model, over-expression of CDX2 inhibits proliferation [Figure 1]a[34].

We suggested the possible roles of CDX2 in CRC in [Figure 1]b. In cancer cell line (LoVo), over-expression of CDX2 leads to apoptosis, inhibition of proliferation, and epithelial mesenchymal transition (EMT)[35],[36]. The CDX2 upregulates the expression of GSK-3β[37], AXIN2, APC[38], and MUCDHL[39] to suppress β-catenin in cells [Supplemental Materials]. Previous literature showed that claudin-1 leads to colon cancer progression (HCT-116, HT-29, SW480, and SW620)[40] and the CDX2 promotes claudin-1 expression and has a modulatory cross-talk with Wnt pathway in colorectal cell lines, HCT-116 and SW480. It could be activated by β-catenin[41].

The homeodomain proteins, including CDX2, directly bind to ATM and MRN complex and suppress DNA repair mechanisms by blocking ATM monomerization through MRN complex in HCT-116 cell line[42]. In cancer cell lines, CDX2 of CRC may serve as a tumor suppressor in DNA damaging environment by interfering DNA damage repair, such as radiation or chemotherapy.

The functions and regulatory mechanisms of CDX2 are different between developing embryo, normal epithelial cell and the CRC.

Caudal-related homeobox transcription factor 2 regulates the cell cycle in colorectal cancer

CDX2 regulates the cell cycle in several manners [Figure 2]. Overexpression of CDX2 in HT-29, a colon cancer cell line that displays the low levels of CDX2[43], leads to the inhibition of cell growth and promotes differentiation[44],[45].

Another CDK inhibitor, p21, is a transcriptional target of CDX2 in HT-29 cell line[46]. An animal model study also indicated that knockdown of CDX2 expression promotes G1-S cell cycle transition and tumor formation[8]. The targeted degradation of CDX2 by Cdk2 phosphorylation identifies that CDX2 activity can be regulated in coordination with cancer cell cycle machinery in Caco-2/15 cell line[47]. CDX2 also stabilizes the P27kip1 by nontranscriptional pathway to suppress the proliferation in colon cancer cell lines, DLD-1 and LS174T[48].
Figure 2:Caudal-related homeobox transcription factor 2 regulates the cell cycle in colorectal cancer. Caudal-related homeobox transcription factor 2 carries out the different mechanisms to control the cell cycle. Black and red lines indicate that caudal-related homeobox transcription factor 2 regulates the cell cycle through the transcriptional and non-transcriptional functions, respectively. Caudal-related homeobox transcription factor 2 can not only inhibit but also promote the G1-S cell cycle transition. Caudal-related homeobox transcription factor 2 downregulates cyclin-dependent kinase inhibitor 2D and in turn inhibits Cdk4/6

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The CDX2 also modulates the cell cycle homeostasis by down-regulating the cyclin-dependent kinase (CDK) inhibitor. In cell line study with Caco-2, the CDX2 protein was capable of suppressing the CDK inhibitor 2D by binding its promoter[49], a member of the INK4 family of CDK inhibitors[50].

The nuclear translocation of β-catenin plays the main role in the activation of Wnt pathway[51],[52]. The AXIN2 protein promotes the degradation of β-catenin and inhibits the Wnt pathway. In colon cancer cell lines, Caco-2 and SW480, the CDX2 upregulates the expression of AXIN2 during differentiation, thereby inhibiting cell proliferation in colon cancer cell lines[38].

In CRC, the G1-S transition of cell cycle is more likely to be inhibited by CDX2, but there is some machinery to maintain the cell renewal by restricting the inhibitory function.

Caudal-related homeobox transcription factor 2 plays a “dual role” in colorectal cancer

The homeodomain proteins can act either an oncogene or a tumor suppressor. The dual role of CDX2 in cancer progression is dependent on the tissue type. In gastric and esophageal mucosa, CDX2 reexpression indicates to further develop intestinal metaplasia, which is related to bile acid irritation[24],[53]. In glioma, the expression of CDX2 indicates more invasiveness of the tumor[54]. The aberrant expression of CDX2 in leukemia indicates proliferation and inferior prognosis[25],[55].

An important question that we are interested in is whether the CDX2 is oncogenic or tumor suppressive in CRC. In vitro study with colon cancer cell lines, Caco-2/TC7 and SW480 showed that EMT was inversely correlated with the CDX2 expression[56]. According to an IHC study of the tumor, CDX2 protein expression was significantly lower at the invasive front[57], which indicated that the lower level of CDX2 was associated with more aggressive tumor behavior. In the cell line studies (LoVo, HT-29, and Caco-2), the CDX2 expression leads to less invasiveness and decreased proliferation[36],[37],[58].

Interestingly, compared with the normal mucosa, the CDX2 mRNA and protein were up-regulated in most tumors[59]. The increased mRNA and the cytoplasmic staining of CDX2 in CRC suggested that CDX2 accumulated in most of colon cancers with controversial function, even tumor suppression, or oncogenesis. We supposed that CDX2 could play a dual role in tumorigenesis[60].

Caudal-related homeobox transcription factor 2 Interacts with the tumor microenvironment

In previous review, to completely knock out the CDX2 expression of CRC cell lines is lethal[16]. CDX2-loss cells might act as the conclusive minority to promote carcinogenesis by non-cell-autonomous manner[61]. The Cdx2 metaplastic knockout cells were not the main part of tumorigenic but altering the microenvironment. The Cdx2-defect cells promote the tumorigenesis of adjacent Cdx2-intact tumor-prone cells by activation of NF-κB, induction of inducible nitric oxide synthase, and loss of function of Apc [Figure 3][61].
Figure 3: Caudal-related homeobox transcription factor 2-loss cells and the microenvironment strongly influence each other. The caudal-related homeobox transcription factor 2 knock-out cells induce tumorigenesis of the caudal-related homeobox transcription factor 2 heterozygous cells via inducible nitric oxide synthase and NF-κB signalings. Caudal-related homeobox transcription factor 2 actively makes the microenvironment to be more tumorigenic. The caudal-related homeobox transcription factor 2 expression of colorectal cancer cells can be passively suppressed by the hypoxia-inducible factor-1α, tumor necrosis factor-1α and type I collagen, which are released by the microenvironment

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In CRC cell lines, SW480 and LS174T, the CDX2 expression was altered by hypoxia. Hypoxia-inducible factor-1α overexpression led to the lower expression of CDX2[62]. CDX2 expression was also reported to be inversely correlated with tumor necrosis factor-1α (TNF-α) at the invasive front and in tumor buddings of rectal cancer specimens and in Caco-2 cell line[63]. This finding also hinted that CDX2 probably associated with the alteration of TNF-α. Type I collagen distributes in stromal and it decreases 55% of Cdx2 mRNA expression in a colon cancer cell lines (DLD1, Caco-2, and LS174T)[64] [Figure 3].

An experiment was designed to prove the CDX2 expression was altered by its environment. The researchers injected the surgically resected fresh human colon cancer cells into the subcutis and the cecal wall of nude-mice. The CDX2 showing variant expression patterns according to the different implantation sites. In the nonintestinal environment, the implanted colon cancer cells increased homogeneous expression of CDX2, but the CDX2 expression was decreased in the cecum[65]. According to previous studies, the expression of CDX2 in CRC and microenvironment could strongly affect each other [Figure 4].
Figure 4: Caudal-related homeobox transcription factor 2 expression of colorectal cancer depends on its microenvironment. The fresh resected colorectal cancer displays different caudal-related homeobox transcription factor 2 expression in cecum and subcutis, indicating that the caudal-related homeobox transcription factor 2 expression of colorectal cancer cells is regulated by the microenvironment

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Different microenvironments indicate to the complex upstream and downstream regulatory machineries of CDX2. In tumor cell lines, tumor xenografts and even patient-derived xenografts are different from those in patients. There are still many gaps from laboratories to the clinical applications of CDX2.

Caudal-related homeobox transcription factor 2 in more specific subgroups of colorectal cancer

The subgrouping of CRC was utilized for more precise individualized treatment. In a previous report, the CRC was classified into six subtypes (CIT)[7]. In the CIT C4 group, which was more like serrated and stem-cell like CRC, low expression of CDX2 was significantly related to poor disease-free survival[61]. Another study also indicated that CDX2 was an independent prognostic factor of serrated pathway in CRC[43]. Combined applications of CDX2 and consensus molecular subtypes (CMSs) were reported to be prognostic in Stage II and Stage III resected colon cancer. In CMS4 group, which were marked with prominent transforming growth factor–β activation, stromal invasion and angiogenesis, CDX2 loss indicated poor prognosis[66],[67]. A literature reported that CDX2 loss was not related to the poor outcome in CRC, but might be associated with the poor prognosis among patients with a family history of CRC[13]. The applications of CDX2 might be potential for predicting tumor behavior[68], especially in specific subgroups.


  Conclusion Top


Due to its complex functions in CRC and the interactions with tumor microenvironment, CDX2 expression is not suitable to be a single biomarker for prognosis. Under the consideration of the tumor environment and the dual-agent character, the clinical application of CDX2 in CRC is controversial. However, CDX2 remains potential to be a marker for personalized medicine in future, especially in the serrated pathway or CRC with stem-cell character. Further studies are necessary to identify the function of CDX2 and the application of CDX2 expression in CRC.

Financial support and sponsorship

Nil.

Conflicts of interest

There are no conflicts of interest.


  Supplemental Materials Top


Cancer cell lines cited in the text

Reference 17: Cell lines used by Salari et al.

CACO2, COLO205, COLO320, COLO741, DLD1, HCA7, HCT116, HCT15, HT29, LoVo, LS174T, LS180, LS411, NCI-H508, NCI-H747, SKCO1, SNUC2B, SW1116, SW1417, SW403, SW48, SW480, SW620, SW837, SW948, and T84.

Reference 33: Cell lines used by Fan et al.

IPEC-J2.

Reference 34: Cell lines used by Escaffit et al.

HIEC.

Reference 35 and 36: Cell lines used by Zheng et al.

LoVo.

Reference 37: Cell lines used by Yu et al.

HT-29 and Caco-2.

Reference 38: Cell lines used by Olsen et al.

Caco-2, SW480, RKO and Hela.

Reference 39: Cell lines used by Hinkel et al.

Caco-2/TC7, HCT116, HT29, T84, SW480 and HEK293.

Reference 40: Cell lines used by Dhawan et al.

HCT116, HT29, SW480, SW620, and RIE.

Reference 41: Cell lines used by Bhat et al.

HCT116, SW480, MDCK-II, MCF-7.

Reference 42: Cell lines used by Johnson et al.

HCT116.

Reference 43: Cell lines used by Graule et al.

LS174T, T84, LS180, HCT15, HT29, SW620, COLO205, HCT116, COLO320, LoVo and CaCo2.

Reference 44: Cell lines used by Mallo et al.

HT29.

Reference 45: Cell lines used by >Soubeyran et al.

HT29

Reference 46: Cell lines used by >Bai et al.

SAOS-2, U-2OS, GT3TKB and HT-29.

Reference 47: Cell lines used by Boulanger et al.

Caco-2/15 and HEK293.

Reference 48: Cell lines used by Aoki et al.

DLD-1 and LS174T

Reference 49: Cell lines used by Boyd et al.

Caco-2.

Reference 50: Cell lines used by Okuda et al.

HeLa.

Reference 51: Cell lines used by Munemitsu et al.

SW480 and HEK293.

Reference 53: Cell lines used by Xu et al.

RGM-1.

Reference 54: Cell lines used by Zhang et al.

HEK293T, U87 and U251.

Reference 55: Cell lines used by Thoene et al.

Nalm6.

Reference 56: Cell lines used by Gross et al.

Caco-2/TC7 and SW480.

Reference 59: Cell lines used by Witek et al.

T84

Reference 62: Cell lines used by Zheng et al.

SW480 and LS174T.

Reference 63: Cell lines used by Coskun et al.

Caco-2.

Reference 64: Cell lines used by Brabletz et al.

DLD1, Caco-2, LS174T and HEK293.

Reference 65: Cell lines used by Benahmed et al.

HT29, T84, and SW480.



 
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