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Nakashima, M.; Uchimaru, K. The Functions of CD30. Encyclopedia. Available online: https://encyclopedia.pub/entry/45368 (accessed on 18 June 2024).
Nakashima M, Uchimaru K. The Functions of CD30. Encyclopedia. Available at: https://encyclopedia.pub/entry/45368. Accessed June 18, 2024.
Nakashima, Makoto, Kaoru Uchimaru. "The Functions of CD30" Encyclopedia, https://encyclopedia.pub/entry/45368 (accessed June 18, 2024).
Nakashima, M., & Uchimaru, K. (2023, June 09). The Functions of CD30. In Encyclopedia. https://encyclopedia.pub/entry/45368
Nakashima, Makoto and Kaoru Uchimaru. "The Functions of CD30." Encyclopedia. Web. 09 June, 2023.
The Functions of CD30
Edit

Previous studies have identified the functional roles of CD30, a member of the tumor necrosis factor receptor superfamily, in CD30-expressing malignant lymphomas, including Hodgkin lymphoma (HL), anaplastic large cell lymphoma (ALCL), and a portion of peripheral T-cell lymphoma (PTCL), adult T-cell leukemia/lymphoma (ATL), and diffuse large B-cell lymphoma (DLBCL). 

TNFRSF TNFSF CD30 (TNFRSF8) Trogocytosis

1. Introduction

Members of the tumor necrosis factor receptor superfamily (TNFRSF) and TNF superfamily (TNFSF) play crucial roles in both innate and adaptive immunity. It has been suggested that the divergence of the TNFRSF and TNFSF families paralleled the emergence of the adaptive immune system, at least through en bloc duplication [1]. As the cloning of the first prototypic members TNF itself and lymphotoxin α, 19 additional TNFSF members and 29 cognate receptors have been identified [2]. In addition to their roles in many important biological processes (development, organogenesis, immunity, cell death, and survival), TNFRSF and TNFSF members are implicated in various acquired or genetic human diseases, ranging from septic shock to autoimmune disorders, allograft rejection, and cancer.
The group of TNFRSF2, 4, 8, 9, 12, 14, and 18 is located on chromosome 1p36.2–36.3, most of which have cognate ligands in TNFSF subfamilies. The biological functions of the group involve T-cell activation, T-cell homeostasis, and T-cell survival [3]. These observations support a co-evolution perspective of TNFRSF and TNFSF families in the immune system. Malignant lymphoma cells express, depending on their immunophenotype, several TNF receptor and ligand superfamily members. B-cell NHLs frequently express CD27/CD27L (TNFRSF7/TNFSF7), CD30 or CD30L (TNFRSF8 or TNFSF8), CD40 (TNFRSF5), and TNFRs/TNF positive (TNFRSF1 and 2/TNFSF2), but T-cell NHLs show expression of CD30, CD40L (TNFSF5), and TNFRs/TNF [4].
CD30, a member of TNFRSF, is a type I single transmembrane protein consisting of 595 amino acids, whose molecular weight is 105–120 kDa [5]. CD30 was initially found to be strongly expressed on Hodgkin and Reed–Sternberg (H-RS) cells of classical Hodgkin lymphoma (cHL) using an anti-Ki-1 antibody. Ki-1, the first anti-CD30 monoclonal antibody, was raised against the cHL patient-derived cell line L428 and observed to react uniquely with primary and cultured H-RS cells [6]. However, soon after, it was found that CD30 is also strongly expressed in a rare subtype of NHL, called anaplastic large cell lymphoma (ALCL) [7]. Later studies showed the expression of CD30 in other pathological conditions, such as viral infection. CD30 expression is often observed in cells infected with HTLV-1, human immunodeficiency virus type 1 (HIV-1), and Epstein–Barr virus (EBV). However, its expression is limited, and normal cells of lymphoid lineage express CD30 only in some activated lymphocytes; furthermore, their expression level is not as high as that of HL cells and ALCL cells. These observations suggest that CD30 is an activation-associated antigen [8][9]. Normal cells of non-lymphoid lineage express CD30 only in uterine decidual cells.
CD30 is strongly expressed in some malignant lymphomas, and its overexpression characterizes cHL and ALCL. Antibody-drug conjugates (ADC) targeting CD30, such as brentuximab vedotin (BV), have shown striking clinical efficiency in cHL and ALCL. CD30 also overexpresses in a portion of peripheral T-cell lymphoma (PTCL), adult T-cell leukemia/lymphoma (ATL), NK lymphoma, and diffuse large B-cell lymphoma (DLBCL), in which clinical studies of BV therapy have been examined.
ATL is a poor prognosis T-cell malignancy that is caused by human T-cell leukemia virus type I (HTLV-1) infection. ATL develops after about 50 years of clinical latency in 2–5% of HTLV-1 carriers [10]; it is estimated that 5–10 million carriers exit worldwide [11]. ATL is endemic in several regions of the world, in particular south-western Japan, the Caribbean basin, and parts of central Africa. Transformation of HTLV-1–infected T cells in vivo is a multistage process, which reflects the status of HTLV-1 infection, i.e., asymptomatic state, smoldering, chronic, lymphoma, or acute type of ATL [12]. The median survival times for each ATL type in the Japanese nationwide, multicenter, hospital-based study are 1815, 778, 305, and 252 days, respectively [13]. The emergence of malignant cells with polylobulated nuclei, (the typical appearance is termed “flower cells”) characterizes ATL. ATL cells show monoclonal integration of HTLV-1 and mainly express CD4, CADM1, CCR4, CD25, and CD45RO, but usually lack CD7 and frequently downregulate CD3 expression. ATL cells acquire abnormalities in the genome, epigenetics, gene expression, and signal transduction.

2. The Functions of CD30

2.1. CD30L: TNFSF8

The ligand for CD30 (CD30L), also known as CD153, a member of the tumor necrosis factor (TNF) superfamily, is a type II single transmembrane protein consisting of 234 amino acids, whose molecular weight is 26–40 kDa. CD30L was identified and cloned by Smith CA et al. using a soluble fusion protein consisting of the extracellular domain of human CD30 linked to the hinge, CH2, and CH3 domains of human immunoglobulin G1 heavy chain [14]. CD30L is expressed relatively broadly, including in granulocytes, macrophages, mast cells, and activated lymphocytes. In terms of pathological conditions, this protein is expressed in a subset of myeloid and lymphoid leukemias and in Burkitt lymphoma [9][15].

2.2. CD30 Signal Transduction

Stimulation of CD30-expressing cells by CD30L elicits various cellular signaling responses, including proliferation, survival, cytokine secretion, and cell death, depending on the cell type and the cellular differentiation state. These signals are triggered after CD30 binds to the trimeric CD30L expressed on the surface of surrounding cells. The ligation of CD30L to CD30 triggers the recruitment of intracellular adaptor proteins, such as TNFR-associated factor (TRAF) proteins, to the TRAF binding domain of the cytoplasmic tail of trimerized CD30, resulting in further modifications to downstream signaling molecules [9]. TRAF family members are critical signal transducers that relay signals between stimulus-sensing surface receptors and transcription regulators, ultimately altering gene expression [16]. Members of the TRAF family of proteins (TRAF1–6) have been initially identified as modulators of signaling cascades downstream of TNFRSF members through their adaptor function and/or E3 ubiquitin ligase activity [17]. TRAF1, 2, 3, and 5 bind to the cytoplasmic tail of CD30, and TRAFs induce the activation of the transcription factors of the NF-κB family (Figure 1A). NF-κB can be activated via two major pathways: the canonical and non-canonical signaling pathways. CD30 signaling induces the activation of both of these pathways [18]. The canonical NF-κB pathway is regulated by TAK1 kinase activation, which induces the ubiquitination and proteasomal degradation of IκB family members, resulting in the release and nuclear translocation of NF-κB1/p50–RelA/p65 and NF-κB1/p50–c-Rel dimers. On the other hand, the non-canonical NF-κB pathway depends on NF-κB-inducing kinase (NIK) activation. NIK can phosphorylate and activate IKKα, which, in turn, promotes p100 processing to generate NF-κB2/p52 and allows its nuclear translocation with RelB. It has been reported that the overexpression of CD30 induces CD30 signaling independent of CD30L [19].
Figure 1. CD30 signaling via trogocytosis. (A) CD30 binds to trimerized CD30L, and, subsequently, recruits TRAF1, 2, 3, and 5 to the intracellular domain of CD30 molecules. Activation of TRAFs triggers downstream signal transduction and induces nuclear translocation of RelA-p50 and C-rel-p50, and RelB-p52, known as the canonical and non-canonical pathways, respectively. This signal transduction elicits various cellular signaling responses, including proliferation, survival, cytokine secretion, and cell death, depending on the cell type and the cellular differentiation state. (B) On the contact surface of CD30L and CD30-expressing cells, CD30L and CD30 form huge clusters, with CD30 extracting CD30L from the adjoining cell, along with part of their plasma membrane, triggering internalization of the clustered complex. These complexes simultaneously generate signalosomes, resulting in intracellular signaling, and are, subsequently, degraded in lysosomes. This phenomenon represents trogocytosis-mediated signal transduction.

2.3. CD30 Signal Transduction via Trogocytosis

Trogocytosis is a biological process whereby a cell (receiving cell) nibbles membrane fragments from another cell (donor cell), leading to the transfer of cell surface molecules along with membrane fragments. This phenomenon was first observed by Cone et al. over 50 years ago [20]. They noted the presence of allogeneic MHC class II (MHCII) molecules on adoptively transferred T cells. As this seminal observation, numerous researchers have shown that the T cell receptor (TCR) rapidly acquires MHC molecules from antigen-presenting cells (APCs) via the immunological synapse formed at the cell–cell contact area [21][22]. Several recent studies reported that trogocytosis of MHC class I (MHCI) and MHCII occurs not only between T cells and APCs, but also between various cell types, including APCs–natural killer (NK) cells; tumor cells–T; or NK cells; etc. [23][24], suggesting that the type of cell receiving such MHC may impact antigen-specific T cell activation.

References

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  8. Croager, E.J.; Muir, T.M.; Abraham, L.J. Analysis of the human and mouse promoter region of the non-Hodgkin’s lymphoma-associated CD30 gene. J. Interferon Cytokine Res. 1998, 18, 915–920.
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