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Open Access 05.09.2018 | Translational Research and Biomarkers

Natural Killer Cell IFNγ Secretion is Profoundly Suppressed Following Colorectal Cancer Surgery

verfasst von: Leonard Angka, MSc, Andre B. Martel, MD, Marisa Kilgour, BSc, Ahwon Jeong, BSc, Manahil Sadiq, BSc, Christiano Tanese de Souza, DVet, Laura Baker, MD, Michael A. Kennedy, PhD, Natasha Kekre, MD, MPH, Rebecca C. Auer, MD, MSc

Erschienen in: Annals of Surgical Oncology | Ausgabe 12/2018

Abstract

Background

Surgical stress results in a significant reduction in natural killer (NK) cell cytotoxicity (NKC), which has been linked to postoperative cancer metastases. However, few studies have measured the impact of surgical stress upon NK cell IFNγ secretion (NKA), a cytokine with essential roles in controlling infection and metastases. The objective of this study was to investigate the impact of surgical stress on NKA in colorectal cancer (CRC) surgery patients.

Methods

Peripheral blood was collected from CRC surgery patients (n = 42) preoperatively and on postoperative day (POD) 1, 3, 5, 28, and 56. Healthy donor blood (n = 27) was collected for controls. We assessed NKA by production of IFNγ following whole blood cytokine stimulation, NKC by ⁵¹Cr-release assay, and immune cell profiling by flow cytometry.

Results

The mean reduction in NKA on POD1 compared with baseline was 83.1% (standard deviation 25.2%; confidence interval 75–91), and therefore the study met the primary endpoint of demonstrating a > 75% decrease in a cohort of CRC surgery patients (p < 0.0001). The profound and universal suppression of NKA persisted with 65.5% (19/29) and 33.3% (4/12) of patients with levels measuring < 75% of baseline on POD28 and POD56 respectively. The NKC was significantly reduced on POD1, but the degree was less pronounced (24.6%, p = 0.0024). Immune cell profiling did not reveal differences in the absolute number of NK cells (CD3⁻CD56⁺) or the ratio of CD56^dim-to-CD56^bright subsets.

Conclusions

NKA is significantly suppressed for up to two months following surgery in CRC patients, a degree of surgery-induced immunosuppression far worse than previously reported.

Supplementary material 1 (PDF 361 kb)

Supplementary material 2 (PDF 368 kb)

Supplementary material 3 (PDF 374 kb)

Supplementary material 4 (PDF 368 kb)

Supplementary material 5 (PDF 484 kb)

Electronic supplementary material

The online version of this article (https://doi.org/10.1245/s10434-018-6691-3) contains supplementary material, which is available to authorized users.

Natural killer (NK) cells are cytotoxic lymphocytes of the innate immune system. Immunosurveillance of malignant and infected cells by NK cells results in direct cytotoxicity and the production of immune stimulating cytokines. NK cells play a central role in the control of cancer metastases.1 Clinical studies have linked intratumoral NK cell infiltration, as well as peripheral blood NK cell effector functions with cancer prognosis and incidence.2^–7 Transient impairment in NK cell cytotoxicity (NKC) following surgery has been linked to cancer recurrence and metastases in both animal models and human studies.8^–13 Several clinical studies have been designed to attenuate the detrimental effects of surgical stress on NK cells with the goal of improving prognosis.11^–16

Beyond NKC, cytokine secretion represents an additional NK cell effector function critically involved in the antitumour immune response. The two main subsets of human NK cells can be distinguished based on expression of CD56 and CD16. While cytotoxic activity in the resting state is primarily assigned to CD56^dim/CD16⁺ NK cells, the stimulated production of cytokines, in particular interferon-gamma (IFNγ), is attributed to both the CD56^dim/CD16⁺ and CD56^bright/CD16⁻ populations.17 Moreover, NK-secreted IFNγ is responsible for shaping the adaptive immune response, and correlated with tumour stage and cancer prognosis.5^,18^–21 This suggests that measurement of IFNγ may provide a more comprehensive overview of NK cell activity (NKA).22

The present study is the first to investigate the effects of major surgery on NK cell IFNγ secretion (or “NKA”) in cancer patients. To measure NKA, we used an assay, which has been shown specifically to stimulate NK cell-IFNγ production from whole blood.19 We report that NKA is universally and profoundly suppressed in the postoperative period, with a greater magnitude and duration compared with NKC. This alternative assay of NK cell dysfunction has important implications for understanding how the immunosuppressive effects of surgery impact the development of subsequent metastases, which will aid in the design of perioperative immunotherapies.

Methods

Patient Characteristics and Clinical Protocol

This single center, prospective, translational study, approved by the Ottawa Health Science Research Ethics Board (20160012-01H), was conducted between August 2016 and June 2017. Eligible patients were > 40 years of age and had a histologically confirmed diagnosis of primary colorectal cancer and a planned surgical resection of the primary tumour (CRC cohort) or healthy donors who volunteered to participate (HD cohort). Exclusion criteria included a history of active viral or bacterial infection or known HIV or Hepatitis B or C, autoimmune diseases, use of immunosuppressive medications, or prior anticancer treatments. All subjects provided written, informed consent.

The primary objective was to compare the reduction in NKA on postoperative day (POD) 1 compared with preoperative (baseline) in the CRC cohort. The secondary objective was to compare NKA at baseline in the CRC cohort to the HD cohort. Exploratory studies included measurement of NKA secretion on POD3, POD5 (optional and only if patient still hospitalized), POD28, and POD56, comparing NKA and NKC across different CRC AJCC cancer stages.

Blood Processing

Patient and HD blood was drawn into BD Vacutainer Sodium-Heparin coated tubes (~ 20 mL/blood draw). One milliliter of whole blood was aliquoted into vacutainer tubes containing Promoca™ and from the remaining whole blood sample peripheral blood mononuclear cells (PBMCs) were isolated by Ficoll density centrifugation before cryopreservation.

Immune Monitoring

NKA Assay

NK-secreted IFNγ levels were measured by ELISA following stimulation of 1 ml of whole blood, as described by the manufacturer (ATGen, NK-Vue™) and in prior publications, with the exception that blood was not drawn directly into tubes containing the proprietary stimulating cytokine cocktail (Promoca™).23 This may result in slight differences in absolute NKA compared with prior studies (ATGen, NK-Vue™). All plasma samples were stored at − 80 °C. The upper and lower limits of detection of the assay were 4000 pg/mL and 15.6 pg/mL respectively, and values exceeding these were assigned the cutoff values.

NKC Assay

Cytotoxicity was measured using the ⁵¹Cr-release assay as previously described.8 Briefly, K562 target cells were labelled with ⁵¹Cr before co-incubation with PBMCs at increasing concentrations (PBMC:Targets = 10:1, 50:1, and 100:1) in triplicate from cryopreserved samples. Following incubation, supernatants were collected and ⁵¹Cr was determined by a gamma counter.

NK Cell Immunophenotyping

Cryopreserved PBMCs (10⁶) were thawed and stained with BV510 Fixable viability dye, CD3, CD56, CD16, and CD14 in Brilliant Stain Buffer (BD). Samples were run on the BD FACSCelesta and analysed with FlowJo v10.

Statistical Analysis

The primary endpoint was to determine if NKA is significantly decreased on POD1 compared with baseline in the CRC surgery cohort. The secondary endpoint was to determine if there is a significant reduction in NKA in the baseline CRC patients compared with HD. Based on our previous studies of postoperative suppression of NKC, we anticipated > 75% reduction in NKA from baseline.24 Given the expected mean for CRC patients (mean = 263.6, standard deviation [SD] = 349), we have an 80% power to detect this difference using a two-sided paired Wilcoxon rank-sum test (α = 0.05) with a sample size of 40 CRC patients (measured at baseline and POD1).19 For the secondary endpoint, we have > 90% power to detect a difference between the CRC patient cohort (baseline) and the HD cohort using a two-sided Mann–Whitney test (α = 0.05), with a sample size of 20 HD. Demographic data was summarized using the median values and 95% confidence interval (CI). Unpaired, nonparametric Mann–Whitney U tests were performed when comparing two groups and paired Wilcoxon rank-sum was used to compare two paired samples (i.e., different timepoints or different assays at a single timepoint). Multiple comparisons were tested with nonparametric Kruskal–Wallis tests. P values < 0.05 were considered significant.

Results

Demographic Data

The demographic data for 27 HD and 42 CRC surgery patients is a summarized in Table 1. There was no significant difference in the median age between the HD and CRC groups. A similar number of patients undergoing open (n = 20) or laparoscopic (n = 22) surgery were included, with an even distribution between Stage I, II, and III patients (33.3, 26.2, and 28.6% respectively). Five (11.9%) patients were Stage IV undergoing combined resection of primary and metastatic tumours.

Table 1

Demographic data

Category	Subcategory	Healthy donors	Patients	Postop complications
Total (n)		27	42	9/42
Blood draws	Baseline (n)	27	42	–
	POD1 (n)	–	41	–
	POD3 (n)	–	37	–
	POD5 (n)	–	12	–
	POD28 (n)	–	29	–
	POD56 (n)	–	12	–
Gender	Male (n)	16	22	7/22
	Female (n)	11	20	2/20
Patient age (median years; 95% CI)		63; 58–67	65; 60–72	–
	<60 (n)	10	13	3/13
	60–69 (n)	13	11	2/11
	>70 (n)	4	18	4/18
Stage	I (n)	–	14	3/14
	II (n)	–	11	1/11
	III (n)	–	12	5/12
	IV (n)	–	5	0/5
Type of surgery	Open (n)	–	20	6/20
	Laparoscopic (n)	–	22	3/22

Italic values indicate the 95% Confidence Intervals (CI)

Scheduled preoperative and postoperative blood draws were collected when possible. The optional POD5 blood draw was collected for only 12 due to earlier discharge. The POD56 collection was added as an amendment following initial results, demonstrating a persistent decrease in NKA at POD28, resulting in a sample size of 12.

NKA is Decreased in CRC Patients

In agreement with previously reported findings, CRC patients had a significantly lower NKA (median: 299.5 pg/mL; CI: 159–391) compared with HD (median: 966 pg/mL; CI: 398–2027; p = 0.0006; Fig. 1).19 Notably, NKA was decreased with advancing age and was significantly reduced in patients > 70 years old (median: 111 pg/mL, CI: 39–629) compared with patients < 60 years old (median: 391 pg/mL, CI: 337–2575; p = 0.04; Supplemental Figure 1).

NKA is Impaired After Surgery

We measured NKA on POD1, 3, 5, 28, and 56 in our CRC patient population (Fig. 2). Astoundingly, 90.2% (37/41) had IFNγ levels below detectable levels (15.6 pg/mL) on POD1 with the highest value being only 53 pg/mL. The mean reduction in NKA on POD1 compared with baseline was 83.1% (SD 25.2%, CI: 75–91), and therefore the study met the primary endpoint of demonstrating a > 75% decrease in a cohort of CRC surgery patients (p < 0.0001). The profound and universal suppression of NKA persisted with 65.5% (19/29) and 33.3% (4/12) maintaining levels reduced > 25% from baseline on POD28 and POD56 respectively.

While no significant difference in NKA based on cancer stage was observed at baseline (p = 0.6; Supplemental Figure 2a), the impact of the pathological stage was noticeable in postoperative recovery of NKA (Supplemental Figure 2b). On POD28, patients with no systemic or regional metastases (Stage I and II) had a significantly lower median suppression from baseline (36.3%; CI: − 5.4–70) compared with Stage III and IV patients (85.14%; CI: − 13.15–93.22; p = 0.035). Examining the impact of open versus laparoscopic surgery on NKA did not reveal any effect of invasiveness of the surgical procedure on the degree of NKA suppression or recovery (Supplemental Figure 3). Lastly, there was a lower baseline and POD28 NKA (although not statistically significant) observed in patients who had a postoperative complication (n = 9 complications vs. n = 32 no complications; Supplemental Figure 4).

NKC is Suppressed to a Lesser Degree Postoperatively

Next, we compared NKA with NKC, using the ⁵¹Cr-release assay, in a subset of HD (n = 12) and CRC patients (n = 13) at baseline and POD1 (Fig. 3a). The median NKC at an E:T ratio of 100:1 was 30% (CI: 24.2–32.3) for HD, 41% (CI: 16.28–43.34) for CRC patients at baseline, and 26% (CI: 12.2–42.2) on POD1. Similar to our results with NKA, NKC was significantly reduced from baseline following surgical stress (p = 0.0024), but the magnitude of suppression was not as profound (24.6% suppression; range: 50.2–104.3%)

Impaired NKA is Not Due to Changes in NK Cell Number or Distribution

We examined the impact of surgery on the absolute number of circulating NK cells by flow cytometry in 23 CRC patients as well as in 15 HD (Fig. 3b; Supplemental Figure 5a). There was a modest but nonsignificant reduction in the number of NK cells/mL (CD3⁻CD56⁺) compared with the HD group (median 0.268 × 10⁶ cells/mL to 0.175 × 10⁶ cells/mL; p = 0.2). Furthermore, there was no significant reduction in the number of CD56^bright or CD56^dim NK cell subsets after surgery (Table 2). Previous studies of cancer patients observed a significant correlation between the ratio of CD56^dim-to-CD56^bright NK cells and NK function.19^,25 In the present study, the relative ratio of these populations remained constant following surgery (Supplemental Figure 5b).

Table 2

Median NK cell IFNγ secretion, NK cell cytotoxicity, and immune cell profiling data

Variable	HD	Baseline	POD1	POD3	POD5	POD28	POD56
NK cell IFNγ secretion ( n )	27	42	41	37	12	29	12
IFNγ pg/mL	966	299.5	15.6	15.6	19.5	161	398
95% CI	398–2027	159–391	15.6–15.6	15.6–26	13–42	42–329	68–1703
NK cell cytotoxicity ( n )	12	13	13
% Killing of K562 Target Cells	29.95	40.76	26.44
95% CI	24.2–32.3	16.3–43.3	12.2–42.2
Immune cell profiling ( n )	15	23	23	19	8	16	10
CD3⁻CD56⁺ NK cell (×10⁶ cells/mL)	0.268	0.175	0.169	0.165	0.2535	0.2085	0.3505
95% CI	0.2–0.34	0.14–0.24	0.12–0.19	0.08–0.31	0.02–0.34	0.16–0.29	0.23–0.86
CD56^dim NK cell (×10⁶ cells/mL)	0.249	0.144	0.131	0.145	0.213	0.1645	0.304
95% CI	0.18–0.28	0.10–0.21	0.1–0.17	0.06–0.21	0.01–0.25	0.11–0.27	0.1–0.43
CD56^bright NK cell (×10⁶ cells/mL)	0.01	0.011	0.007	0.009	0.017	0.0135	0.012
95% CI	0.007–0.015	0.006–0.013	0.004–0.009	0.005–0.015	0.001–0.033	0.004–0.019	0.007–0.023
CD14⁺ Monocyte (×10⁶ cells/mL)	0.438	0.396	0.643	0.41	0.3795	0.3045	0.591
95% CI	0.39–0.5	0.26–0.44	0.58–1.07	0.29–0.92	0.16–1.03	0.24–0.48	0.37–0.81

Median values, italicized 95% Confidence Intervals (CI) of the median

Sample size (n) is bolded

Lastly, we detected a significant increase in the number of CD14⁺ monocytes on POD1 (Table 2; Fig. 3c; p = 0.0006) and these were predominantly classical and intermediate monocytes (Supplemental Figure 5c), consistent with an immediate release of immature monocytes from the bone marrow during acute injury.26^,27

Discussion

In the present study, we demonstrated that NKA is severely suppressed following cancer surgery, with more than 90% of patients below the limit of detection on POD1 (Fig. 2). The effect was present in every patient, regardless of gender, age, cancer stage or type of surgery. The duration of suppression also was unexpectedly present until POD28 in 65.5% of patients. The prolonged suppression suggests a degree of immunoparalysis that has implications for the development of postoperative infections and cancer recurrence.

The impaired immune response to bacterial pathogens following surgery is well documented, and although the role of NK cells is less clear, studies have shown that IFNγ secretion by PBMCs in response to S. aureus is reduced following severe injury due to impairment of CD56^bright NK cells.28^–30 Coordinated immune responses against bacterial infection requires the secretion of proinflammatory cytokines (e.g., IL-12, TNF-α) by innate immune cells to stimulate NK cell IFNγ secretion, which promotes an effective T cell response to several pathogens, providing strong evidence for the importance of NK-cell dysfunction in postoperative susceptibility to infections.31^–34

Impairment of NKA also may have implications for the development of postoperative metastases, although we are not aware of any studies exploring the effect of NKA on cancer outcomes.16 We and others have previously shown that surgical stress results in a significant impairment in NKC, leading to the formation of cancer metastases in animal models.8^,24^,35^–37 A clinical study demonstrated that postoperative autologous tumour cell killing is correlated with lung cancer survival.13 T-cell dysfunction has been well described following surgical stress, and we have previously published that surgery can render a protective cancer vaccine completely ineffective in a murine model secondary to T-cell suppression.38^–40 Interestingly, Wirsdorfer et al. demonstrated that surgery-induced impairment of NK-cell IFNγ secretion was responsible for T-cell suppression, using OVA-specific T cells.41 This provides a provocative hypothesis for the effects of surgery on T-cell mediated antitumour immunity and has implications for perioperative vaccination and immunotherapy strategies.

A second objective of the study was to compare NKA in a cohort of CRC patients to HD of a similar age (Fig. 1). We confirmed that cancer patients have a significant defect in the IFNγ secretory capacity as previously reported.5^,19 However, likely due to our small sample size, we did not observe a significant association between cancer stage and NKA at baseline. We did observe a significant reduction in NKA in patients > 70 years of age, which is consistent with the known effects of aging upon NK-cell function.42^,43 Because of its reproducibility and simplicity, this assay is currently under development as a screening tool for CRC detection, with preliminary results suggesting similar negative predictive value but higher sensitivity compared with fecal immunochemical tests.23^,44 NKA was measured from in vitro stimulated samples, which cannot be directly extrapolated to in vivo levels of serum IFNγ as recently demonstrated by other groups.16^,45

When comparing NKA to NKC, we observed three main differences. First, no significant decrease in baseline NKC of CRC patients compared with HD was detected. This is in contrast to other studies and may be explained by the preponderance (25/42 patients, 60%) of early-stage patients in our study, which is consistent with findings that NKC is correlated with disease burden in cancer patients.5^,19^–21^,46^–48 Second, the degree of NKC impairment on POD1 (Fig. 3a) was much less pronounced compared with NKA and was not universally present. This may be a result of using cryopreserved PBMCs to measure NKC, because cryopreservation may have unintended effects on NK-cell function.45 Finally, suppression of NKA was still present in the majority of patients at POD28, a time when we have previously reported that NKC is normalized to preoperative levels.8^,49 One possible explanation is that with NKC, NK cells are stimulated with K562 cells, which is known to measure only the activity of CD56^dim, whereas with NKA, stimulation is with cytokines, which measures function of both the CD56 bright and dim NK subsets.50^,51

To explore this further, we assessed the numbers and subsets of circulating NK cells by flow cytometry. We report that there were no significant changes in the absolute number of NK cells (Fig. 3b) or ratio of CD56^dim-to-CD56^bright NK cells, which confirms that, as expected, NK cells are present but dysfunctional following surgery. Koo et al. reported that NKA was inversely correlated with the CD56^dim-to-CD56^bright ratio in prostate cancer patients.5 Unfortunately, we were unable to explore such a correlation in the postoperative period, because the NKA was below assay detection in the majority of patients following surgery. Interestingly, there was a significant increase in the number of CD14⁺ monocytes on POD1 compared with baseline (Fig. 3c). Our group and others have shown that there is a large increase in myeloid-derived suppressor cells (MDSCs) following surgery in humans and in mice.40^,52^,53 We suspect that the large increase in CD14⁺ monocytic cells are likely the expansion of surgery-induced MDSCs; however, we did not assess suppressive function in this study.

NK cells are a main source of IFNγ during the initial stages of an innate immune response and are central to the development of an adaptive immune response.54 Thus, postoperative suppression of NKA is potentially a major contributor to postoperative cancer recurrence, the early formation of micrometastases, and, more broadly, postoperative infectious complications. We hypothesize that perioperative therapies positioned to prevent or minimize postoperative NK cell dysfunction may improve postoperative cancer outcomes. Currently, we have two ongoing clinical trials of perioperative immunotherapy, which include NKA as a correlative endpoint.15^,55

Acknowledgment

Funding provided by CIHR New Investigator Award, Cancer Research Society, The Ottawa Hospital Academic Medical Organization and in-kind support from ATGen.

Disclosures

Study reagents (NK-Vue^TM) provided by ATGen Canada Inc.

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Electronic supplementary material

Below is the link to the electronic supplementary material.

Supplementary material 1 (PDF 361 kb)

Supplementary material 2 (PDF 368 kb)

Supplementary material 3 (PDF 374 kb)

Supplementary material 4 (PDF 368 kb)

Supplementary material 5 (PDF 484 kb)

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Titel: Natural Killer Cell IFNγ Secretion is Profoundly Suppressed Following Colorectal Cancer Surgery
verfasst von: Leonard Angka, MSc
Andre B. Martel, MD
Marisa Kilgour, BSc
Ahwon Jeong, BSc
Manahil Sadiq, BSc
Christiano Tanese de Souza, DVet
Laura Baker, MD
Michael A. Kennedy, PhD
Natasha Kekre, MD, MPH
Rebecca C. Auer, MD, MSc
Publikationsdatum: 05.09.2018
Verlag: Springer International Publishing
Erschienen in: Annals of Surgical Oncology / Ausgabe 12/2018
Print ISSN: 1068-9265
Elektronische ISSN: 1534-4681
DOI: https://doi.org/10.1245/s10434-018-6691-3

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Abstract

Background

Methods

Results

Conclusions

Electronic supplementary material

Methods

Patient Characteristics and Clinical Protocol

Blood Processing

Immune Monitoring

NKA Assay

NKC Assay

NK Cell Immunophenotyping

Statistical Analysis

Results

Demographic Data

NKA is Decreased in CRC Patients

NKA is Impaired After Surgery

NKC is Suppressed to a Lesser Degree Postoperatively

Impaired NKA is Not Due to Changes in NK Cell Number or Distribution

Discussion

Acknowledgment

Disclosures

Unsere Produktempfehlungen

Die Chirurgie

e.Med Interdisziplinär

Electronic supplementary material

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