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Humanized and Defucosylated Antibody against Podoplanin (humLpMab-23-f) Exerted Antitumor Activities in Human Tumor Xenograft Models

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Abstract
We previously developed a highly sensitive and specific anti-PDPN mAb, LpMab-23 (mouse IgG1, kappa). In this study, we produced a humanized IgG1 version (humLpMab-23) and its defucosylated form (humLpMab-23-f) of an anti‑PDPN mAb to potentiate the ADCC activity. The humLpMab-23 could recognize PDPN‑overexpressed Chinese hamster ovary (CHO)-K1 (CHO/PDPN) and PDPN-positive PC-10 and LN319 cells by flow cytometry. Furthermore, we found that humLpMab-23-f exerted ADCC and complement-dependent cytotoxicity against CHO/PDPN, PC-10 and LN319 cells in vitro and exhibited potent antitumor activities in the xenograft models. These results indicated that humLpMab-23-f could be useful for an antibody treatment regimen for PDPN-positive human cancers.
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Subject: Medicine and Pharmacology  -   Oncology and Oncogenics

1. Introduction

PDPN is a type I transmembrane glycoprotein and has an extracellular domain, a transmembrane domain, and a short cytoplasmic tail. The PDPN extracellular domain possesses platelet aggregation-stimulating (PLAG)1 to PLAG3 domains [1]. Furthermore, several PLAG-like domains (PLDs) were identified, and one of PLDs is called as the PLAG4 domain [1]. PDPN is modified with mucin O-glycans with galactose-linked β1, 3 to N-acetyl-galactosamine (GalNAc) [2,3]. The O-glycosylated PLAG3 at Thr52 or PLD/PLAG4 have been reported to interact with a platelet receptor, C-type lectin-like receptor 2 (CLEC-2), which is important for PDPN-induced platelet aggregation [3,4]. The PDPN intracellular domain can recruit ezrin, radixin, and moesin (ERM) complex that regulates actin cytoskeleton reorganization and epithelial to mesenchymal transition (EMT) [5,6]. Furthermore, PDPN interacts with matrix metalloproteinases [7] and hyaluronan receptor CD44 [8,9]. The complex was formed in tumor invadopodia, which promotes the hyaluronan-binding and extracellular matrix (ECM) degradation [8,9]. Furthermore, PDPN mediates the diverse pattern of tumor invasion including collective invasion in squamous cell carcinomas [10] and ameboid invasion in melanoma [11].
Overexpression of PDPN has been reported in many tumors, including squamous cell carcinomas in head and neck [12], oral [13], and esophagus [14], malignant gliomas [15,16], and mesotheliomas [17]. The overexpression of PDPN is associated with poor clinical outcomes [1]. Furthermore, PDPN is also expressed in cancer-associated fibroblasts (CAFs), a major component of the tumor microenvironment (TME). CAFs are reported to enhance cancer cell survival and affect therapeutic outcome. CAFs are also involved in the formation of immunosuppressive TME which could reduce the antitumor immunity [18]. Elevated PDPN staining in CAFs is correlated with poor prognosis in lung [19,20,21], breast [22], and pancreatic [23] cancer patients. Therefore, PDPN has been considered as a useful diagnostic marker and an attractive therapeutic target for tumors.
Our groups previously established several mAbs against human PDPN. A clone NZ-1 recognizes between PLAG2 and PLAG3 domain of PDPN, possesses a neutralizing activity for CLEC-2 binding, and inhibits the platelet aggregation and hematogenous pulmonary metastasis [24]. NZ-8 (a rat-human chimeric antibody derived from NZ-1) exhibited ADCC activities and antitumor effects against malignant pleural mesothelioma in the presence of human natural killer (NK) cells [17]. A mouse-human chimeric anti-PDPN mAb, chLpMab-7 recognizes a PLD domain. chLpMab-7 never showed the neutralization activity through inhibition of PDPN–CLEC-2 interaction but suppressed tumor growth and hematogenous pulmonary metastasis [25]. These findings indicated that ADCC and CDC activities are critical in targeting PDPN-positive tumors.
We also developed a cancer-specific monoclonal antibody (CasMab) method that uses flow cytometry and immunohistochemistry to select mAbs that exhibited reactivity with cancer cells but reduced reactivity with normal cells [26]. LpMab-2 is a CasMab, which recognizes the glycopeptide structure from Thr55 to Leu64 of PDPN [26]. LpMab-23, another CasMab against PDPN, recognizes a peptide structure from Gly54 to Leu64 of PDPN [27]. These PDPN-targeting CasMabs [26,27,28] have been applied to chimeric antigen receptor (CAR)-T therapy in mice preclinical models [29,30,31].
The ADCC activity is mediated by NK cells through binding of the FcγRIIIa to mAbs Fc region. A core fucose deficiency on the N-glycan in the Fc region facilitates the binding of Fc to FcγRIIIa on effector cells [32]. In recombinant mAb production in Chinese hamster ovary (CHO) cells, Fucosyltransferases 8 (Fut8)-deficient CHO is ideal host to produce completely defucosylated mAbs for therapeutic use [33]. We produced mouse-human chimeric and defucosylated forms of anti-PDPN mAbs from LpMab-2 and LpMab-23, which showed the antitumor effect in mouse xenograft model.
In this study, we produced a humanized and defucosylated anti-PDPN mAb (humLpMab-23-f), and evaluated the ability to induce ADCC and CDC or antitumor efficacy against PDPN-positive tumor cells.

2. Materials and Methods

2.1. Cell lines

CHO-K1 was obtained from the American Type Culture Collection (ATCC, Manassas, VA, USA). CHO/PDPN was established as described previously [26]. PC-10 was purchased from Immuno-Biological Laboratories Co., Ltd. (Gunma, Japan). CHO-K1, CHO/PDPN, and PC-10 were cultured in Roswell Park Memorial Institute (RPMI)-1640 medium [Nacalai Tesque, Inc. (Nacalai), Kyoto, Japan]. LN319 was purchased from Addexbio Technologies (San Diego, CA, USA) and cultured in Dulbecco’s modified Eagle’s medium (DMEM) medium (Nacalai). Both media were supplemented with 10% heat-inactivated fetal bovine serum [FBS, Thermo Fisher Scientific, Inc. (Thermo), Waltham, MA], 100 units/ml of penicillin, 100 μg/ml streptomycin, and 0.25 μg/ml amphotericin B (Nacalai). ExpiCHO-S and Fut8-deficient ExpiCHO-S (BINDS-09) were cultured following manufacturer’s instructions. All cell lines were cultured at 37 °C in a humidified atmosphere with 5% CO2 and 95% air.

2.2. Recombinant mAb production

For the generation of a humanized anti-human PDPN mAb (humLpMab-23), the complementarity determining region (CDR) of LpMab-23 VH, frame sequences of VH in human Ig, and CH of human IgG1 were cloned into the pCAG-Neo vector [FUJIFILM Wako Pure Chemical Corporation (Wako), Osaka, Japan]. The CDR of LpMab-23 VL, frame sequences of VL in human Ig, and CL of human lambda chain were cloned into the pCAG-Ble vector (Wako). The antibody expression vectors of humLpMab-23 were transfected into ExpiCHO-S or BINDS-09 using the ExpiCHO-S Expression System (Thermo Fisher Scientific, Inc.). Produced mAbs were named as humLpMab-23 and humLpMab-23-f, respectively. humLpMab-23 and humLpMab-23-f were purified using Ab-Capcher (ProteNova Co., Ltd., Kagawa, Japan). Human IgG was purchased from Sigma-Aldrich Corp. (St. Louis, MO).

2.3. Animal Experiments for mice xenograft model

All animal experiments for antitumor activity by humLpMab-23-f were approved (approval no. 2020-035) by the Institutional Committee for Experiments of the Institute of Microbial Chemistry (Numazu, Japan). Mice were monitored and maintained as described previously [34].

2.4. Flow cytometry

CHO-K1, CHO/PDPN, PC-10, and LN319 cells were collected using 0.25% trypsin and 1 mM ethylenediamine tetraacetic acid (EDTA; Nacalai). The cells (1 × 105 cells/sample) were treated with humLpMab-23 or blocking buffer (control) (0.1% BSA in PBS) for 30 min at 4 °C. Next, the cells were treated with Fluorescein isothiocyanate (FITC)-conjugated anti-human IgG (1:2,000; Sigma-Aldrich Corp., St. Louis, MO) for 30 min at 4 °C. The EC 800 Cell Analyzer (Sony Corp., Tokyo, Japan) was used to collect the fluorescence data, which were analyzed using FlowJo [BD Biosciences (BD), Franklin Lakes, NJ, USA].

2.5. Determination of the binding affinity by flow cytometry

After being suspended in 100 μL of serially diluted humLpMab-23, the cells were then incubated with 1:200 of FITC-conjugated anti-human IgG. The EC800 Cell Analyzer was then used to gather fluorescence data. The binding isotherms were fitted into the built-in, one-site binding model in GraphPad PRISM 8 (GraphPad Software, Inc., La Jolla, CA) to calculate the dissociation constant (KD).

2.6. ADCC

Human NK cells were purchased from Takara Bio, Inc., (Shiga, Japan). Target cells were labeled with 10 µg/mL Calcein AM (Thermo Fisher Scientific, Inc.) and resuspended in the same medium. Target cells were plated in 96-well plates (1 × 104 cells/well) and mixed with the human NK cells, humLpMab-23-f, or control human IgG. After a 4.5-hour incubation, Calcein AM release to the supernatant from each well was measured. Fluorescence intensity was determined using a microplate reader (Power Scan HT; BioTek Instruments, Winooski, VT) with excitation and emission wave-lengths of 485 and 538 nm, respectively. Cytotoxicity (% of lysis) was calculated as % lysis = (E − S)/(M − S) × 100, where E is the fluorescence of combined target and effector cells, S is spontaneous fluorescence of target cells only, and M is maximum fluorescence measured after lysing all cells with a buffer containing 0.5% Triton X-100, 10 mM Tris-HCl (pH 7.4), and 10 mM of EDTA.

2.7. CDC

The Calcein AM-labeled target cells were plated and mixed with anti-PDPN antibodies and rabbit complement (final dilution 1:10, Low-Tox-M Rabbit Complement; Cedarlane Laboratories, Hornby, ON, Canada) and 100 μg/ml of control human IgG or humLpMab-23-f. Following incubation for 4.5 h at 37 °C, the Calcein release into the medium was measured, as described above.

2.8. Antitumor activity of humLpMab-23-f in xenografts of CHO-K1, CHO/PDPN, PC-10, and LN319 cells

CHO-K1, CHO/PDPN, PC-10, and LN319 cells (0.3 mL of 1.33 × 108 cells/mL in DMEM) were mixed with 0.5 mL of BD Matrigel Matrix Growth Factor Reduced (BD Biosciences, San Jose, CA). BALB/c nude mice (Charles River Laboratories, Inc.) were injected subcutaneously in the left flank (100 μL) with the suspension mentioned earlier (5 × 106 cells). After day 6, 100 μg of humLpMab-23-f (n = 8) and control human IgG (n = 8) in 100 μL PBS were injected into mice through intraperitoneal injection (i.p.). Additional antibodies were injected on days 14 and 21. Human NK cells (8.0 × 105 cells) were injected around the tumors on days 6, 14, and 21. The tumor volume was measured on days 6, 11, 14, 18, 21, and 25 after the inoculation of cells. Twenty-five days after cell inoculation, all mice were euthanized by cervical dislocation and tumor diameters and volumes were determined as previously described.

2.9. Statistical analyses

All data are shown as mean ± standard error of the mean (SEM). In ADCC, CDC, and tumor weight, Welch’s t-test was used for the statistical analyses. In tumor volume and mouse weight, ANOVA with Sidak’s post hoc test was used. P < 0.05 was considered to indicate a statistically significant difference.

3. Results

3.1. Production of humanized anti-PDPN mAb, humLpMab-23

We previously established an anti-PDPN mAb (LpMab-23; mouse IgG1, kappa) by the immunization of PDPN ectodomain produced by glioblastoma LN229 cells [35]. LpMab-23 was shown to be useful for flow cytometry [35] and immunohistochemistry [36]. In this study, we engineered a humanized LpMab-23 (humLpMab-23) by fusing the VH and VL CDRs of LpMab-23 with the CH and CL chains of human IgG1, respectively (Figure 1A). The humLpMab-23 detected CHO/PDPN cells, but not parental CHO-K1 cells (Figure 1B). Furthermore, humLpMab-23 reacted PDPN-positive glioblastoma LN319 and lung squamous cell carcinoma PC-10 cells (Figure 1C).
A kinetic analysis of the interactions of humLpMab-23 with CHO/PDPN, LN319, and PC-10 was performed by flow cytometry. As shown in Figure 1D, the KD for the interaction of humLpMab-23 with CHO/PDPN, LN319, and PC-10 were 4.7 × 10−9 M, 4.9 × 10−9 M, and 5.4 × 10−9 M, respectively. These results suggest that humLpMab-23-f demonstrates a high affinity for PDPN-positive cells.

3.2. ADCC and CDC by humLpMab-23-f against CHO/PDPN cells

We next produced humLpMab-23-f, the core-fucose deleted version of humLpMab-23 using Fut8-deficient ExpiCHO-S (BINDS-09) cells (Figure 1A) and examined whether humLpMab-23-f could exert ADCC against CHO/PDPN cells in the presence of human NK-cells. The humLpMab-23-f showed ADCC (51.6% cytotoxicity) against CHO/PDPN cells more effectively than the control human IgG (13.6% cytotoxicity; P < 0.05) (Figure 2A). There was no difference between humLpMab-23-f and control human IgG in ADCC against CHO-K1 (Figure 2B).
We then investigated whether humLpMab-23-f could show CDC against CHO/PDPN cells. As shown in Figure 2C, humLpMab-23-f could exert CDC (69.2% cytotoxicity) in CHO/PDPN cells compared with that elicited by control human IgG (15.0% cytotoxicity; P < 0.05). There was no difference between humLpMab-23-f and control human IgG in CDC against CHO-K1 (Figure 2D). These results indicated that humLpMab-23-f possessed potent ADCC and CDC activities against CHO/PDPN cells.

3.3. Antitumor effects of humLpMab-23-f against CHO/PDPN xenograft

Following the inoculation of CHO/PDPN in BALB/c nude mice, humLpMab-23-f and control human IgG were intraperitoneally injected into the mice on days 6, 14, and 21. Furthermore, human NK cells were injected around the tumors on days 6, 14, and 21. On days 6, 11, 14, 18, 21, and 25 after the inoculation of CHO/PDPN, the tumor volume was measured. The humLpMab-23-f administration resulted in a significant reduction of tumors on days 18 (P < 0.01), 21 (P < 0.01), and 25 (P < 0.01) compared with that of human IgG (Figure 3A). The humLpMab-23-f administration resulted in about 73% reduction of the volume compared with that of the control human IgG on day 25 post-injection. The weight of CHO/PDPN tumors treated with humLpMab-23-f was significantly lower than that treated with control human IgG (90% reduction; P < 0.01; Figure 3C). CHO/PDPN tumors that were resected from mice on day 25 are demonstrated in Figure 3E. The body weight was not affected in CHO/PDPN tumor-bearing mice treated with humLpMab-23-f and control human IgG (Figure 3G).
In the CHO-K1-bearing mice, humLpMab-23-f and control human IgG were injected intraperitoneally into mice on days 6, 14, and 21 after the inoculation. Furthermore, human NK cells were injected around the tumors. No difference was observed between humLpMab-23-f and control human IgG in CHO-K1 xenograft volume (Figure 3B) and weight (Figure 3D). CHO-K1 tumors that were resected from mice on day 25 are shown in Figure 3F. The body weight loss was not observed (Figure 3H). Supplementary Figure S1 showed the body appearance in CHO/PDPN and CHO-K1 xenografts-inoculated mice treated with human IgG and humLpMab-23-f on day 25.

3.4. ADCC and CDC by humLpMab-23-f against LN319 and PC-10 cells

We next investigated the ADCC of humLpMab-23-f against endogenous PDPN-positive LN319 and PC-10 cells. As shown in Figure 4A, humLpMab-23-f showed ADCC (47.7% cytotoxicity) against LN319 cells more potently than did the control human IgG (15.8% cytotoxicity; P < 0.01). Furthermore, humLpMab-23-f showed ADCC (46.7% cytotoxicity) against PC-10 cells more potently than did the control human IgG (14.6% cytotoxicity; P < 0.01) (Figure 4B).
In the CDC of humLpMab-23-f against LN319 cells, humLpMab-23-f exhibited CDC (34.7% cytotoxicity) compared with that induced by control human IgG (11.6% cytotoxicity; P < 0.05) (Figure 4C). Moreover, humLpMab-23-f exhibited CDC against PC-10 cells (53.4% cytotoxicity) compared with that induced by control human IgG (15.0% cytotoxicity; P < 0.01) (Figure 4D).
These results demonstrated that humLpMab-23-f exhibited potent ADCC and CDC activities against endogenous PDPN-positive LN319 and PC-10 cells.

3.5. Antitumor effects of humLpMab-23-f in LN319 and PC-10 xenografts.

In the LN319 and PC-10 xenograft tumor-bearing mice, humLpMab-23-f and control human IgG were intraperitoneally injected on days 6, 14, and 21. Furthermore, human NK cells were injected around the tumors on days 6, 14, and 21. The tumor volume was measured on days 6, 11, 14, 18, 21, and 25 after the inoculation. The humLpMab-23-f administration resulted in a significant reduction in LN319 xenograft on days 21 (P < 0.01) and 25 (P < 0.01) compared with that of the control human IgG (Figure 5A). The humLpMab-23-f also showed a significant reduction in PC-10 xenograft on days 18 (P < 0.01), 21 (P < 0.01) and 25 (P < 0.01) compared with that of the control human IgG (Figure 5B). The humLpMab-23-f administration resulted in a 64% (LN319) and a 69% (PC-10) reduction of tumor weight compared with that of the control human IgG on day 25 (Figure 5C,D). Tumors that were resected on day 25 are shown in Figure 5E,F.
The body weight loss was not observed in either LN319 or PC-10 xenograft-bearing mice treated with humLpMab-23-f and control human IgG (Figure 5G,H). Supplementary Figure S2 showed the body appearance in LN319 and PC-10 xenografts-inoculated mice treated with human IgG and humLpMab-23-f on day 25.

4. Discussion

In this study, we showed that humLpMab-23-f exhibited potent ADCC and CDC activities against CHO/PDPN, PC-10, and LN319 cells (Figure 2 and Figure 4). Furthermore, administration of humLpMab-23-f in tumors-bearing mice completely suppressed the growth of CHO/PDPN xenograft (Figure 3A,C,E) and exerted potent antitumor effects in PC-10 and LN319 xenografts (Figure 5). These results indicated that humLpMab-23-f could be useful for an antibody therapy for PDPN-positive human tumors.
We previously evaluated defucosylated mouse-human chimeric LpMab-23 (chLpMab-23-f) [27]. Although chLpMab-23-f exhibited ADCC activity and moderate antitumor effect against CHO/PDPN, chLpMab-23-f neither exhibited ADCC activity against PC-10 cells nor CDC against PDPN-expressing tumor cells [27]. The results of binding affinity revealed that KD of humLpMab-23 against PC-10 was 5.4 × 10−9 M (Figure 1D). In contrast, KD of chLpMab-23 against PC-10 was 1.4 × 10−7 M (Supplemental Figure S3). These results indicated that humLpMab-23 shows a superior binding affinity compared to chLpMab-23. The increased binding affinity is thought to be a reason why humLpMab-23-f exerted more potent antitumor effects than chLpMab-23.
PDPN is involved in the tumor malignant progression through activation of tumor invasiveness, EMT, and stemness. Furthermore, PDPN induces platelet aggregation through interaction with CLEC-2 on platelet, which is associated with venous thromboembolism and evasion of immune cells [37,38]. Therefore, several anti-PDPN mAbs have been evaluated in preclinical studies. Our group demonstrated that NZ-8 (a rat-human chimeric antibody derived from NZ-1) and chLpMab-7 (a mouse-human chimeric anti-PDPN mAb) showed antitumor effects through ADCC and CDC activities. Furthermore, NZ-1-R700 conjugate [39] and NZ-16 labeled with Actinium-225 (225Ac) [40] have been developed as a near-infrared photoimmunotherapy and radioimmunotherapy against PDPN, respectively. Both mAbs also exhibited the antitumor effect against the malignant pleural mesothelioma xenograft model. In addition, the neutralizing mAbs for PDPN-CLEC-2 interaction also suppress hematogenous pulmonary metastasis by inhibiting platelet aggregation [40,41,42,43]. LpMab-23 has a different epitope from the abovementioned anti-PDPN mAbs [27], and showed comparable ADCC/CDC activities and antitumor effect in vivo (Figure 2, Figure 3, Figure 4 and Figure 5). In contrast, the reactivity of LpMab-23 to normal cells such as lymphatic endothelial cells was low in immunohistochemical analysis [36]. It should be determined whether humLpMab-23-f possesses reduced cytotoxicity against normal PDPN-expressed cells.
CAFs are important players in the TME. CAFs involve in tumor progression through the promotion of tumor proliferation, invasion, chemoresistance as well as ECM remodeling and immunosuppression [44]. PDPN expression is also observed in CAFs. Increased expression of PDPN in CAFs from lung [19,20,21], breast [22], and pancreatic [23] is correlated with poor prognosis of patients. In PDPN-positive CAFs from lung tumors, the CAFs promote lung cancer cell resistance to inhibitors of EGFR [45]. Furthermore, increased expression of TGF-β was observed in PDPN-positive CAFs [21], which are associated with an immunosuppressive tumor microenvironment [18]. In breast cancer, the ratio S100A4/PDPN expression in the CAFs is associated with disease outcomes across subtypes. The high PDPN levels in the CAFs significantly correlated with shorter recurrence-free survival and overall survival [46]. Moreover, PDPN-positive CAFs was associated with low IL-2 activity and resistance to trastuzumab in HER2-positive breast cancer patients [47]. These findings indicate that the character of CAFs is an important predictive marker of breast cancer progression and resistance to treatment. Therefore, the targeting of PDPN-positive CAFs using anti-PDPN mAbs could be a strategy for tumor therapy.
The co-inhibitory receptors including PD-1 and CTLA-4 on effector T lymphocytes play a key role in tumor immunity. PDPN was reported as a co-inhibitory receptor on both CD4+ and CD8+ T lymphocytes. In T lymphocyte-specific pdpn-deleted mice, the growth of inoculated B16F10 tumor was significantly delayed. The pdpn-deficient CD8+ tumor-infiltrating lymphocytes exhibited increased TNF production, and the exhausted T lymphocytes were decreased [48]. Moreover, a T cell-specific deletion of pdpn in mice spontaneously developed exacerbated autoimmune encephalomyelitis with increased accumulation of effector CD4+ T lymphocytes [49]. These results suggest the involvement of PDPN in tumor immune suppression. Although the ligand of PDPN to suppress T lymphocytes has not been identified, a PDPN-targeting mAb has potential as novel immune checkpoint inhibitor. We have established anti-PDPN mAbs against various species including mouse [1]. The anti-mouse PDPN mAb could be useful to reveal the importance of PDPN-positive lymphocytes in cancer immunity.

Author Contributions

H.S. and T.O. performed the experiments. M.K.K. and Y.K. designed the experiments. H.S. and Y.K. analyzed the data. H.S. and Y.K. wrote the manuscript. All authors have read and agreed to the manuscript.

Funding

This research was supported in part by Japan Agency for Medical Research and Development (AMED) under Grant Numbers: JP22ama121008 (to Y.K.), JP22am0401013 (to Y.K.), 23bm1123027h0001 (to Y.K.), JP22ck0106730 (to Y.K.), and JP21am0101078 (to Y.K.), and by the Japan Society for the Promotion of Science (JSPS) Grants-in-Aid for Scientific Research (KAKENHI) grant nos. 22K06995 (to H.S.), 21K07168 (to M.K.K.), and 22K07224 (to Y.K.).

Institutional Review Board Statement

Animal experiments were approved by the Institutional Committee for Experiments of the Institute of Microbial Chemistry (approval no. 2020-035).

Informed Consent Statement

Not applicable.

Data Availability Statement

The data presented in this study are available in the article and Supplementary Material.

Acknowledgments

The authors would like to thank Shun-ichi Ohba and Akiko Harakawa (Institute of Microbial Chemistry [BIKAKEN], Numazu, the Microbial Chemistry Research Foundation) for technical assistance with animal experiments.

Conflicts of Interest

The authors have no conflicts of interest to declare.

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Figure 1. Flow cytometry using humLpMab-23. (A) A humanized IgG1 mAb, humLpMab-23 was generated from LpMab-23-f (mouse IgG1). The core-fucose-deficient form (humLpMab-23-f) was produced using Fut8-deficient ExpiCHO-S (BINDS-09) cells. (B) CHO-K1 and CHO/PDPN cells were treated with 1 µg/ml of humLpMab-23 or buffer control, followed by FITC-conjugated anti-human IgG. (C) LN319 and PC-10 cells were treated with 1 µg/ml of humLpMab-23 or buffer control, followed by Alexa Fluor 488-conjugated anti-human IgG. (D) Determination of the binding affinity of humLpMab-23 using flow cytometry. CHO/PDPN, LN319 and PC-10 cells were suspended in humLpMab-23 at indicated concentrations, followed by the addition of FITC-conjugated anti-human IgG. Fluorescence data were analyzed using the EC800 Cell Analyzer. The dissociation constant (KD) was calculated by GraphPad Prism 8.
Figure 1. Flow cytometry using humLpMab-23. (A) A humanized IgG1 mAb, humLpMab-23 was generated from LpMab-23-f (mouse IgG1). The core-fucose-deficient form (humLpMab-23-f) was produced using Fut8-deficient ExpiCHO-S (BINDS-09) cells. (B) CHO-K1 and CHO/PDPN cells were treated with 1 µg/ml of humLpMab-23 or buffer control, followed by FITC-conjugated anti-human IgG. (C) LN319 and PC-10 cells were treated with 1 µg/ml of humLpMab-23 or buffer control, followed by Alexa Fluor 488-conjugated anti-human IgG. (D) Determination of the binding affinity of humLpMab-23 using flow cytometry. CHO/PDPN, LN319 and PC-10 cells were suspended in humLpMab-23 at indicated concentrations, followed by the addition of FITC-conjugated anti-human IgG. Fluorescence data were analyzed using the EC800 Cell Analyzer. The dissociation constant (KD) was calculated by GraphPad Prism 8.
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Figure 2. The ADCC and CDC activities mediated by humLpMab-23-f in CHO-K1 and CHO/PDPN cells. (A,C) The ADCC induced by humLpMab-23-f or control human IgG against CHO/PDPN (A) and CHO-K1 (C) cells. (B,D) The CDC induced by humLpMab-23-f or control human IgG against CHO/PDPN (B) and CHO-K1 (D) cells. Values are shown as mean ± SEM. Asterisks indicate statistical significance (*P < 0.05; Welch’s t-test). n.s., not significant. ADCC, antibody-dependent cellular cytotoxicity; CDC, complement-dependent cytotoxicity.
Figure 2. The ADCC and CDC activities mediated by humLpMab-23-f in CHO-K1 and CHO/PDPN cells. (A,C) The ADCC induced by humLpMab-23-f or control human IgG against CHO/PDPN (A) and CHO-K1 (C) cells. (B,D) The CDC induced by humLpMab-23-f or control human IgG against CHO/PDPN (B) and CHO-K1 (D) cells. Values are shown as mean ± SEM. Asterisks indicate statistical significance (*P < 0.05; Welch’s t-test). n.s., not significant. ADCC, antibody-dependent cellular cytotoxicity; CDC, complement-dependent cytotoxicity.
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Figure 3. Antitumor activity of humLpMab-23-f against CHO-K1 and CHO/PDPN xenograft. (A,B) CHO/PDPN (A) and CHO-K1 (B) cells were subcutaneously injected into BALB/c nude mice (day 0). On day 6, 100 μg of humLpMab-23-f or control human IgG was injected intraperitoneally into mice. Additional antibodies were injected on days 14 and 21. The human NK cells were also injected around the tumors on days 6, 14, and 21. The tumor volume was measured on days 6, 11, 14, 18, 21, and 25. Values are presented as the mean ± SEM. **P < 0.01 (ANOVA and Sidak’s multiple comparisons test). (C,D) Tumor weight of CHO/PDPN (C) and CHO-K1 (D) xenograft tumors on day 25. Values are presented as the mean ± SEM. **P < 0.01 (Welch’s t-test). (E,F) The CHO/PDPN (E) and CHO-K1 (F) xenograft tumors on day 25 (scale bar, 1 cm). (G,H) The body weight of CHO/PDPN (G) and CHO-K1 (H) xenograft-bearing mice treated with control human IgG and humLpMab-23-f. n.s., not significant.
Figure 3. Antitumor activity of humLpMab-23-f against CHO-K1 and CHO/PDPN xenograft. (A,B) CHO/PDPN (A) and CHO-K1 (B) cells were subcutaneously injected into BALB/c nude mice (day 0). On day 6, 100 μg of humLpMab-23-f or control human IgG was injected intraperitoneally into mice. Additional antibodies were injected on days 14 and 21. The human NK cells were also injected around the tumors on days 6, 14, and 21. The tumor volume was measured on days 6, 11, 14, 18, 21, and 25. Values are presented as the mean ± SEM. **P < 0.01 (ANOVA and Sidak’s multiple comparisons test). (C,D) Tumor weight of CHO/PDPN (C) and CHO-K1 (D) xenograft tumors on day 25. Values are presented as the mean ± SEM. **P < 0.01 (Welch’s t-test). (E,F) The CHO/PDPN (E) and CHO-K1 (F) xenograft tumors on day 25 (scale bar, 1 cm). (G,H) The body weight of CHO/PDPN (G) and CHO-K1 (H) xenograft-bearing mice treated with control human IgG and humLpMab-23-f. n.s., not significant.
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Figure 4. The ADCC and CDC activities mediated by humLpMab-23-f in PDPN-positive LN319 and PC-10 cells. (A,B) ADCC induced by humLpMab-23-f or control human IgG against LN319 (A) and PC-10 (B) cells. (C,D) CDC induced by humLpMab-23-f or control human IgG against LN319 (C) and PC-10 (D) cells. Values are shown as mean ± SEM. Asterisks indicate statistical significance (*P < 0.05, **P < 0.01; Welch’s t-test). n.s., not significant. ADCC, antibody-dependent cellular cytotoxicity; CDC, complement-dependent cytotoxicity.
Figure 4. The ADCC and CDC activities mediated by humLpMab-23-f in PDPN-positive LN319 and PC-10 cells. (A,B) ADCC induced by humLpMab-23-f or control human IgG against LN319 (A) and PC-10 (B) cells. (C,D) CDC induced by humLpMab-23-f or control human IgG against LN319 (C) and PC-10 (D) cells. Values are shown as mean ± SEM. Asterisks indicate statistical significance (*P < 0.05, **P < 0.01; Welch’s t-test). n.s., not significant. ADCC, antibody-dependent cellular cytotoxicity; CDC, complement-dependent cytotoxicity.
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Figure 5. Antitumor activity of humLpMab-23-f against LN319 and PC-10 xenografts. (A,B) LN319 (A) and PC-10 (B) cells were subcutaneously injected into BALB/c nude mice (day 0). On day 6, 100 μg of humLpMab-23-f or control human IgG were intraperitoneally injected into mice. Additional antibodies were injected on days 14 and 21. The human NK cells were also injected around the tumors on days 6, 14, and 21. The tumor volume was measured on days 6, 11, 14, 18, 21, and 25. Values are presented as the mean ± SEM. **P < 0.01 (ANOVA and Sidak’s multiple comparisons test). (C,D) Tumor weight of LN319 (C) and PC-10 (D) xenograft tumors on day 25. Values are presented as the mean ± SEM. **P < 0.01 (Welch’s t-test). (E, F) The LN319 (E) and PC-10 (F) xenograft tumors on day 25 (scale bar, 1 cm). (G,H) The body weight of LN319 (G) and PC-10 (H) xenograft-bearing mice treated with control human IgG and humLpMab-23-f. n.s., not significant.
Figure 5. Antitumor activity of humLpMab-23-f against LN319 and PC-10 xenografts. (A,B) LN319 (A) and PC-10 (B) cells were subcutaneously injected into BALB/c nude mice (day 0). On day 6, 100 μg of humLpMab-23-f or control human IgG were intraperitoneally injected into mice. Additional antibodies were injected on days 14 and 21. The human NK cells were also injected around the tumors on days 6, 14, and 21. The tumor volume was measured on days 6, 11, 14, 18, 21, and 25. Values are presented as the mean ± SEM. **P < 0.01 (ANOVA and Sidak’s multiple comparisons test). (C,D) Tumor weight of LN319 (C) and PC-10 (D) xenograft tumors on day 25. Values are presented as the mean ± SEM. **P < 0.01 (Welch’s t-test). (E, F) The LN319 (E) and PC-10 (F) xenograft tumors on day 25 (scale bar, 1 cm). (G,H) The body weight of LN319 (G) and PC-10 (H) xenograft-bearing mice treated with control human IgG and humLpMab-23-f. n.s., not significant.
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