bims-netuvo Biomed News
on Nerves in tumours of visceral organs
Issue of 2023‒12‒03
fifteen papers selected by
Maksym V. Kopanitsa, The Francis Crick Institute



  1. MedComm (2020). 2023 Dec;4(6): e431
      Cancer of the central nervous system (CNS) can crosstalk systemically and locally in the tumor microenvironment and has become a topic of attention for tumor initiation and advancement. Recently studied neuronal and cancer interaction fundamentally altered the knowledge about glioma and metastases, indicating how cancers invade complex neuronal networks. This review systematically discussed the interactions between neurons and cancers and elucidates new therapeutic avenues. We have overviewed the current understanding of direct or indirect communications of neuronal cells with cancer and the mechanisms associated with cancer invasion. Besides, tumor-associated neuronal dysfunction and the influence of cancer therapies on the CNS are highlighted. Furthermore, interactions between peripheral nervous system and various cancers have also been discussed separately. Intriguingly and importantly, it cannot be ignored that exosomes could mediate the "wireless communications" between nervous system and cancer. Finally, promising future strategies targeting neuronal-brain tumor interactions were reviewed. A great deal of work remains to be done to elucidate the neuroscience of cancer, and future more research should be directed toward clarifying the precise mechanisms of cancer neuroscience, which hold enormous promise to improve outcomes for a wide range of malignancies.
    Keywords:  cancer; cancer neuroscience; interaction; neuron; neuroscience; treatment
    DOI:  https://doi.org/10.1002/mco2.431
  2. Cell Oncol (Dordr). 2023 Nov 28.
      BACKGROUND: Accumulating studies have shown that tumors are regulated by nerves, and there is abundant nerve infiltration in the tumor microenvironment. Many solid tumors including breast cancer (BRCA) have different degrees of perineural invasion (PNI), which is closely related to the tumor occurrence and progression. However, the regulatory mechanism of PNI in BRCA remains largely unexplored.METHODS: PNI-related molecular events are analyzed by the RNAseq data of BRCA samples deposited in The Cancer Genome Atlas (TCGA) database. Extracellular matrix (ECM) components within the tumor microenvironment are analyzed by immunohistochemical staining of α-SMA, Sirius red staining, and Masson trichrome staining. Soft and stiff matrix gels, living cell imaging, and dorsal root ganglion (DRG) coculture assay are used to monitor cancer cell invasiveness towards nerves. Western blotting, qRT-PCR, enzyme-linked immunosorbent assay combined with neutralizing antibody and small molecular inhibitors are employed to decode molecular mechanisms.
    RESULTS: Comparative analysis that the ECM was significantly associated with PNI status in the TCGA cohort. BRCA samples with higher α-SMA activity, fibrillar collagen, and collagen content had higher frequency of PNI. Compared with soft matrix, BRCA cells cultured in stiff matrix not only displayed higher cell invasiveness to DRG neurons but also had significant neurotrophic effects. Mechanistically, integrin β1 was identified as a functional receptor to the influence of stiff matrix on BRCA cells. Moreover, stiffened matrix-induced activation of integrin β1 transduces FAK-YAP signal cascade, which enhances cancer invasiveness and the neurotrophic effects. In clinical setting, PNI-positive BRCA samples had higher expression of ITGB1, phosphorylated FAK, YAP, and NGF compared with PNI-negative BRCA samples.
    CONCLUSIONS: Our findings suggest that stiff matrix induces expression of pro-metastatic and neurotrophic genes through integrin β1-FAK-YAP signals, which finally facilitates PNI in BRCA. Thus, our study provides a new mechanism for PNI in BRCA and highlights nerve-based tumor treatment strategies.
    Keywords:  Breast cancer; Cancer neuroscience; Neural invasion; Tumor innervation
    DOI:  https://doi.org/10.1007/s13402-023-00901-x
  3. Biochim Biophys Acta Rev Cancer. 2023 Nov 28. pii: S0304-419X(23)00181-6. [Epub ahead of print] 189032
      Pancreatic ductal adenocarcinoma (PDAC) exhibits the highest incidence of perineural invasion among all solid tumors. The intricate interplay between tumors and the nervous system plays an important role in PDAC tumorigenesis, progression, recurrence, and metastasis. Various clinical symptoms of PDAC, including anorexia and cancer pain, have been linked to aberrant neural activity, while the presence of perineural invasion is a significant prognostic indicator. The use of conventional neuroactive drugs and neurosurgical interventions for PDAC patients is on the rise. An in-depth exploration of tumor-nervous system crosstalk has revealed novel therapeutic strategies for mitigating PDAC progression and effectively relieving symptoms. In this comprehensive review, we elucidate the regulatory functions of tumor-nervous system crosstalk, provide a succinct overview of the relationship between tumor-nervous system dialogue and clinical symptomatology, and deliberate the current research progress and forthcoming avenues of neural therapy for PDAC.
    Keywords:  Nervous system; Neural therapy; Pancreatic cancer; Tumor microenvironment; Tumor–nervous system crosstalk
    DOI:  https://doi.org/10.1016/j.bbcan.2023.189032
  4. J Pain. 2023 Nov 24. pii: S1526-5900(23)00628-4. [Epub ahead of print]
      Lazertinib (JNJ-73841937, YH25448) is a mutant-selective irreversible epidermal growth factor receptor (EGFR) tyrosine kinase inhibitor (TKI) targeting both the T790M and activating mutation while sparing wild-type EGFR. Paresthesia is one of the most common adverse events seen with lazertinib treatment, suggesting that lazertinib could affect the sensory nervous system. However, the mechanism of action for this paresthesia remains unclear. In this study, we investigated whether and how lazertinib affects peripheral sensory neurons. Through Fura-2-based calcium imaging and whole-cell patch clamp recording in primary-cultured dorsal root ganglion (DRG) neurons from adult mice, we found that application of lazertinib elicits spontaneous calcium responses in a subset of small-to-medium-sized neurons. Moreover, lazertinib induced spontaneous firings and hyperexcitability in a subset of transient receptor potential vanilloid 1 (TRPV1)-lineage DRG neurons and sensitized TRPA1 response, while sparing TRPV1 response. Lazertinib-responsive neurons were also responsive to capsaicin, further supporting that lazertinib selectively activates nociceptive neurons. Lazertinib-induced calcium responses were pharmacologically blocked with HC-030031 (transient receptor potential ankyrin 1 (TRPA1) antagonist) and MDL-12330A (adenylyl cyclase inhibitor), suggesting that lazertinib activates sensory neurons through indirect activation of TRPA1. However, unlike vincristine which produces peripheral neuropathy by axonal degeneration, lazertinib did not cause neurite fragmentation in cultured DRG neurons. Finally, intraplantar injection of lazertinib induced TRPA1-dependent pain-like behaviors in vivo. Collectively, our data suggest a direct effect of lazertinib on nociceptive sensory neurons via TRPA1 selective mechanisms, which could be a putative mechanism of lazertinib-induced sensory abnormalities in clinical patients. PERSPECTIVE: This article presents a TRPA1-dependent, lazertinib-induced activation of mouse sensory neurons in vitro and lazertinib-induced pain-like behaviors in vivo. The same mechanisms may underlie in clinical condition, suggesting that TRPA1 could be a potential therapeutic target to manage lazertinib-induced paresthesia.
    Keywords:  Degeneration; EGFR-TKI; Lazertinib; Nociceptor; TRPA1
    DOI:  https://doi.org/10.1016/j.jpain.2023.11.018
  5. World J Surg Oncol. 2023 Nov 29. 21(1): 372
      BACKGROUND: Perineural invasion (PNI) is regarded as a prognostic factor for patients with GC. However, the significance of PNI in patients with stage II GC remains unclear. This study aimed to investigate the clinical implication of PNI in patients with stage II GC undergoing curative resection.METHODS: Patients with stage II GC who underwent curative resection were retrospectively evaluated from January 2010 to July 2019. According to PNI status, all patients were divided into two groups: with or without PNI. The prognostic value of PNI was analyzed by univariate and multivariate Cox proportional hazards regression models.
    RESULTS: A total of 233 patients were included in this study. There were 100 patients with PNI (42.92%) and 133 patients without PNI (57.08%). The overall survival (OS) and disease-free survival (DFS) rates for patients with PNI were significantly lower than that for patients without PNI (p = 0.019 and p = 0.032, respectively). Multivariate analysis indicated that the presence of PNI was an independent risk factor for OS (hazard ratio (HR): 1.76, 95% confidence interval (CI) 1.02-3.06, p = 0.044) and DFS (HR: 1.70, 95% CI 1.04-2.80, p = 0.035), while adjuvant chemotherapy (AC) was an independent protective factor for OS (HR: 0.51, 95% CI 0.30-0.88, p = 0.016) and DFS (HR: 0.52, 95% CI 0.31-0.86, p = 0.011). Furthermore, among patients with PNI, those who received AC had better OS (p = 0.022) and DFS (p = 0.027) than their counterparts. When patients with PNI received AC, the OS (p = 0.603) and DFS (p = 0.745) appeared to be similar to those without PNI and no AC.
    CONCLUSION: In patients with stage II GC undergoing curative resection, the presence of PNI was associated with worse survival, which appeared to improve with the treatment of AC, indicating a potential need for more intensive AC.
    Keywords:  Adjuvant chemotherapy; Perineural invasion; Prognosis; Stage II gastric cancer
    DOI:  https://doi.org/10.1186/s12957-023-03236-x
  6. Front Surg. 2023 ;10 1308757
      Purpose: It was aimed at assessing the benefits of adjuvant chemotherapy (ACT) for patients with node-negative colorectal cancer (CRC) either with or without perineural invasion (PNI).Methods: We systematically searched PubMed, Cochrane Library, Embase, and Web of Science from database inception through October 1, 2023. Survival outcomes were analyzed using hazard ratios (HRs) and corresponding 95% confidence intervals (CIs). The methodological quality of included studies was assessed using the Newcastle-Ottawa Scale (NOS). Heterogeneity for the descriptive meta-analyses was quantified using the I2 statistic.
    Results: Ten studies included in this review. ACT improved overall survival (OS) (HR 0.52, 95% CI 0.40-0.69) and disease-free survival (DFS) (HR 0.53, 95% CI 0.35-0.82) in PNI + patients but did not affect DFS (HR 1.13, 95% CI 0.72-1.77) in PNI- patients. A disease-specific survival (DSS) benefit with chemotherapy was observed in PNI + (HR 0.76, 95% CI 0.58-0.99) and PNI- patients (HR 0.76, 95% CI 0.57-1.00). And PNI decreased DFS (HR 1.94, 95% CI 1.52-2.47) and OS (HR 1.75, 95% CI 0.96-3.17) in node-negative CRC.
    Conclusions: In conclusion, chemotherapy appears most beneficial for survival outcomes in node-negative patients with PNI, but may also confer some advantage in those without PNI.
    Systematic Review Registration: Identifier INPLASY2021120103.
    Keywords:  adjuvant chemotherapy; colorectal cancer; node negative; perineural invasion; retrospective cohort
    DOI:  https://doi.org/10.3389/fsurg.2023.1308757
  7. Medicine (Baltimore). 2023 Nov 24. 102(47): e36358
      RATIONALE: Neurofibromatosis type 1 (NF1) is an autosomal dominant neurocutaneous syndrome that causes multiple central and peripheral nerve sheath tumors. People with NF1 have a 10% chance of developing malignant peripheral nerve sheath tumors (MPNSTs). Here we report a unique instance of a malignant schwannoma that has remained free of metastasis since its initial removal a decade ago. The malign schwannoma has been infrequently documented in the literature, and remarkably, no instances of such an extensive postoperative time without metastases have ever been described.PATIENT CONCERNS: A 46-year-old male patient with NF had multiple neurofibromas in different parts of his body, underwent surgery about 10 years ago (2013), and was diagnosed histopathologically as MPNST.
    DIAGNOSES: He was admitted to our institution with a recurrent mass in the posterior third of the proximal thigh and severe pain radiating to the left lower extremity, which presented as sciatic pain (2021). A magnetic resonance imaging and fluorodeoxyglucose-positron emission tomography examination revealed that the tumor was likely malignant.
    INTERVENTIONS: Surgical excision was performed.
    OUTCOME: A 10-year follow-up revealed no metastases or neurologic impairment.
    LESSONS: When articles about benign schwannomas are placed in a separate category, little is written about NF-1-related malignant schwannomas of the sciatic nerve. MPNSTs are high-grade, aggressive sarcomas with a high risk of local recurrence (40%-65%) and metastasis to other body parts. Therefore, among the various benign peripheral nerve sheath tumors in NF-1 patients, the diagnosis of MPNST is crucial.Orthopedic surgeons should be aware that neurofibromas in NF-1 have a significant risk of developing MPNSTs. This study reports the successful treatment of a giant malignant sciatic nerve schwannoma with a long follow-up period without metastasis.
    DOI:  https://doi.org/10.1097/MD.0000000000036358
  8. Asian J Surg. 2023 Nov 25. pii: S1015-9584(23)01895-X. [Epub ahead of print]
      
    Keywords:  Anal canal; Malignant peripheral nerve sheath tumor; Neurofibroma; Rectum
    DOI:  https://doi.org/10.1016/j.asjsur.2023.11.116
  9. J Family Med Prim Care. 2023 Sep;12(9): 1923-1930
      Background: Global breast cancer incidence is increasing at an annual rate of 3·1%. Female breast cancer has surpassed lung cancer as the most commonly diagnosed cancer, with an estimated 2.3 million new cases (11.7%). However, the data from different parts of India are still lacking and the study was conducted to assess the burden of disease at tertiary referral centers in central India.Material and Methods: Retrospective record analysis (June 2013-June 2017) of data from outdoor clinics and pathology reports. The patients aged <15 yrs, nonresidence of Chhattisgarh, and diagnosed outside the study period were excluded. The triple assessment was used to diagnose all breast lumps (sensitivity 99%).
    Results: Eighty patients were diagnosed having breast carcinoma. The mean age for breast cancer was 39 ± 3.028 years (ranged 31-50 years). Twenty patients had locally advanced breast carcinoma. The predominant religion was Hindu 55.00%. The referral pathway to seek medical care for breast cancer was via a gynecologist in 40% (32/80). Familial breast cancers were in 0.03% (3/80) of patients. None breast cancer patients have previous histology-proven benign breast disease. The mean size of the breast cancer lump was 3.56 cm (ranged 1.0-11.0 cm). Overlying skin ulceration (n = 2), skin infiltration/peau-d'- orange (n = 2), skin tethering (n = 4), and bloody nipple discharge were found in one patient. Breast cancer was diagnosed during lactation (postnatal period) in one patient. The maximum number of patients have tumor size >5 cm (72.6%). Immunohistochemistry and pathological analysis was done on core biopsy (n = 20) and surgical procedure (n = 60). Modified radical mastectomy was done in 52, breast conservative surgery with Sentinal Lymph node biopsy and axillary lymph node dissection in 6, and toilet mastectomy in two patients. The predominant tumors were solid (n = 79/80), with both solid and cystic types (1/80). The solid and cystic lesion on FNAC was of C3b type, and an excision biopsy revealed medullary carcinoma of the breast. Invasive ductal carcinoma-no special type (IDC-NST) was observed to be the most common histopathologic type (n = 70/80), followed by medullary carcinoma (n = 2), metaplastic carcinoma (n = 1), papillary carcinoma (n = 4), Paget disease with DCIS (n = 1), mucinous carcinoma (n = 1), invasive lobular carcinoma (n = 1). One male patient with breast cancer and two female patient having bilateral breast cancer also have IDC-NST.Scarff Bloom Richardson Grade was predominantly graded 2 in 46.25% (37/80) of breast cancer patients (Grade 1 = 9, Grade 2 = 37, Grade 3 = 34). Lymphovascular (LVI) and perineural invasion (PNI) were predominantly without LVI and PVI. (Lymphovascular present and perineural invasion present = 4, Lymphovascular present and perineural invasion absent = 32, Lymphovascular absent and perineural invasion absent = 42, Lymphovascular absent and perineural invasion present = 2). Histological examination of axillary lymph nodes showed the presence of malignant cells in all. Triple-negative breast carcinoma was 26.58% (21/79). Most breast cancer presented at stage II A = 37.5% (30/80) and II B = 28.7% (23/80) of the AJCC staging system.
    Conclusion: The clinico-epidemio and histological profile of breast cancer in Chhattisgarh is similar to other parts of India. Scarff Bloom Richardson Grade was predominantly grade 2 in 46.25% (37/80) contrary to Grade III (70%) in other series from India.
    Keywords:  Breast cancer; Central India; Chhattisgarh; breast cancer epidemiology; breast cancer screening; breast diseases; cancer registry; mammography; mastectomy; self-breast examination; triple-negative breast cancer
    DOI:  https://doi.org/10.4103/jfmpc.jfmpc_2315_22
  10. J Exp Clin Cancer Res. 2023 Dec 02. 42(1): 329
      BACKGROUND: Hedgehog-Gli1 signaling induces development of two common neurological features seen in pancreatic ductal adenocarcinoma (PDAC): peripheral neural invasion (PNI) and peripheral neural remodeling (PNR). However, the underlying molecular mechanisms in cancer cells and nerves within Gli1-derived PNR have not previously been comprehensively analyzed.METHODS: In this study, RNA sequencing was used to screen meaningful circRNAs in PNR. An in vitro model of PNR was subsequently constructed through a co-culture system comprising PDAC cells and murine dorsal root ganglia (DRG) (as the neuronal element), and the relevant mechanisms were explored using a series of molecular biology experiments. A subcutaneous nude mouse tumorigenesis model was established to further verify the occurrence of PNR that was detected in human PDAC samples.
    RESULTS: We first confirmed the molecular mechanisms of PNR development through crosstalk between exosomal circ-0011536 and DRG. In Gli1-overpressed PDAC, circ-0011536 is mainly secreted by exosomes. After being ingested by DRG, it can promote the activity of DRG by degrading miR-451a and upregulating the expression of VGF. Overexpression of Gli1 can accelerate the proliferation of subcutaneous tumors in mice and is closely related to the density of nerve plexuses, while downregulating circ-RNA inhibits tumor proliferation and reduces the density of nerve plexuses. In addition, TMA results confirmed that Gli1 overexpression significantly increased the expression of VGF and was closely associated with increased nerve plexus density.
    CONCLUSION: Hedgehog-Gli1-induced exosomal circ-0011536 promoted PNR via the miR-451a/VGF axis, thereby establishing that it may contribute to PDAC-associated nerve changes with activated Hedgehog signaling.
    Keywords:  Circular RNA; Dorsal root ganglion; Exosome; Neurological changes; Pancreatic cancer
    DOI:  https://doi.org/10.1186/s13046-023-02894-9
  11. Radiol Case Rep. 2024 Jan;19(1): 230-233
      Plexiform schwannoma is a rare subtype of schwannoma. In this report, we present a case of plexiform schwannoma arising from the sciatic, tibial, and peroneal nerves. A 54-year-old man presented with a painful palpable mass extending from the left posterior thigh to the calf. Magnetic resonance imaging showed multiple bead-like nodular structures along the sciatic, tibial, and peroneal nerve pathway. The nodular lesions showed uniform signal intensity on T1-weighted imaging. On T2-weighted imaging, each nodule showed an eccentric area of relatively low signal intensity surrounded by an area of higher signal intensity and a low-intensity rim. Plexiform schwannoma or neurofibroma was considered as the preoperative diagnosis. Because of the patient's severe symptoms and strong desire for relief, tumor enucleation of the largest painful nodule was performed, and plexiform schwannoma was confirmed pathologically.
    Keywords:  Magnetic resonance imaging; Peroneal nerve; Plexiform schwannoma; Sciatic nerve; Target sign; Tibial nerve
    DOI:  https://doi.org/10.1016/j.radcr.2023.10.009
  12. J Microsc Ultrastruct. 2023 Jul-Sep;11(3):11(3): 125-129
      Malignant melanotic nerve sheath tumor (MMNST) which was formerly known as melanocytic schwannoma, is an uncommon aggressive type of nerve sheath tumor. It originates from nerve roots with clonal Schwann cell proliferation and melanin pigment production. MMNST which was once thought to be a benign tumor is now considered a malignant disease based on the latest 2020 World Health Organization classification of soft tissue tumors. Interestingly, despite the histologic features appearing benign with a low proliferation index, the clinical course of this tumor is malignant, which was demonstrated in case series with high rate of recurrences and metastasis. This tumor can occur sporadically or in patients with an underlying familial predisposition syndrome called, Carney's complex. Affected patients will often harbor a germline mutation in the PRKAR1A gene. MMNST can be histologically difficult to distinguish from malignant melanoma, other melanocytic tumors, and Schwannoma. Having a better understanding of its clinic pathologic characteristics and associated conditions is essential in properly diagnosing and managing affected individuals. This includes the possible need for genetic testing to detect germline mutations, genetic counseling, and surveillance according to published recommendations. In this article, we summarize the clinic pathologic and molecular features of MMNST and discuss what is known about its molecular biology and its associations with predisposing conditions. The review was conducted through an extensive PubMed search using keywords then relevant publications were selected.
    Keywords:  Malignant melanotic nerve sheath tumors; melanocytic schwannoma; molecular diagnostics and carney’s complex; nerve
    DOI:  https://doi.org/10.4103/jmau.jmau_5_22
  13. PLoS One. 2023 ;18(11): e0293905
      BACKGROUND: Surgery is essential for curative treatment of solid tumors. Evidence from recent retrospective clinical analyses suggests that use of propofol-based total intravenous anesthesia during cancer resection surgery is associated with improved overall survival compared to inhaled volatile anesthesia. Evaluating these findings in prospective clinical studies is required to inform definitive clinical guidelines but will take many years and requires biomarkers to monitor treatment effect. Therefore, we examined the effect of different anesthetic agents on cancer recurrence in mouse models of breast cancer with the overarching goal of evaluating plausible mechanisms that could be used as biomarkers of treatment response.METHODS: To test the hypothesis that volatile anesthesia accelerates breast cancer recurrence after surgical resection of the primary tumor, we used three mouse models of breast cancer. We compared volatile sevoflurane anesthesia with intravenous propofol anesthesia and used serial non-invasive bioluminescent imaging to track primary tumor recurrence and metastatic recurrence. To determine short-term perioperative effects, we evaluated the effect of anesthesia on vascular integrity and immune cell changes after surgery in animal models.
    RESULTS: Survival analyses found that the kinetics of cancer recurrence and impact on survival were similar regardless of the anesthetic agent used during cancer surgery. Vascular permeability, immune cell infiltration and cytokine profiles showed no statistical difference after resection with inhaled sevoflurane or intravenous propofol anesthesia.
    CONCLUSIONS: These preclinical studies found no evidence that choice of anesthetic agent used during cancer resection surgery affected either short-term perioperative events or long-term cancer outcomes in mouse models of breast cancer. These findings raise the possibility that mouse models do not recapitulate perioperative events in cancer patients. Nonetheless, the findings suggest that future evaluation of effects of anesthesia on cancer outcomes should focus on cancer types other than breast cancer.
    DOI:  https://doi.org/10.1371/journal.pone.0293905
  14. Anticancer Res. 2023 Dec;43(12): 5415-5424
      BACKGROUND/AIM: In this study, we used an orthotropic breast cancer model combined with ketamine addiction and next-generation sequencing (NGS) to comprehensively investigate molecular alterations in ketamine-mediated metastasis. Ketamine is widely used in anesthesia and drug abuse. Our previous study revealed that ketamine promotes the growth of breast cancer cells; however, the detailed molecular mechanism remains unknown.MATERIALS AND METHODS: An orthotropic breast cancer model was established by injecting EO771 breast cancer cells into the mammary fat pad of mice intraperitoneally administered ketamine (30 mg/kg, daily) for 68 days. Tumors collected at day 38 were frozen for future analysis, and their metastasis state was checked at day 68.
    RESULTS: Tumors were grouped and subjected to NGS analysis, followed by differential gene expression analysis (DEseq) and pathway identification. DEseq analysis showed that ketamine up-regulated metastasis-related signaling, and the key genes were BMP5, FZD6, MMP1B, EGFR, WNT5A, BMP7, and DCN.
    CONCLUSION: Ketamine addiction up-regulates the expression of genes involved in the Wnt, EGFR, and BMP signaling cascades, which may be associated with breast cancer progression and metastasis.
    Keywords:  BMP; EGFR; Ketamine; Wnt; breast cancer; genes
    DOI:  https://doi.org/10.21873/anticanres.16745
  15. Cancer Res. 2023 Dec 01. 83(23): 3868-3885
      Nerves can support tumor development by secreting neurotransmitters that promote cancer cell proliferation and invasion. 5-Hydroxytryptamine (5-HT) is a critical neurotransmitter in the gastrointestinal nervous system, and 5-HT signaling has been shown to play a role in tumorigenesis. Here, we found that expression of the 5-HT receptor HTR2B was significantly elevated in human gastric adenocarcinoma tissues compared with nontumor tissues, and high HTR2B expression corresponded to shorter patient survival. Both 5-HT and a specific HTR2B agonist enhanced gastric adenocarcinoma cell viability under metabolic stress, reduced cellular and lipid reactive oxygen species, and suppressed ferroptosis; conversely, HTR2B loss or inhibition with a selective HTR2B antagonist yielded the inverse tumor suppressive effects. In a patient-derived xenograft tumor model, HTR2B-positive tumors displayed accelerated growth, which was inhibited by HTR2B antagonists. Single-cell analysis of human gastric adenocarcinoma tissues revealed enrichment of PI3K/Akt/mTOR and fatty acid metabolism-related gene clusters in cells expressing HTR2B compared with HTR2B-negative cells. Mechanistically, HTR2B cooperated with Fyn to directly regulate p85 activity and trigger the PI3K/Akt/mTOR signaling pathway, which led to increased expression of HIF1α and ABCD1 along with decreased levels of lipid peroxidation and ferroptosis. Together, these findings demonstrate that HTR2B activity modulates PI3K/Akt/mTOR signaling to stimulate gastric cancer cell survival and indicate that HTR2B expression could be a potential prognostic biomarker in patients with gastric cancer.SIGNIFICANCE: Nerve cancer cross-talk mediated by HTR2B inhibits lipid peroxidation and ferroptosis in gastric cancer cells and promotes viability under metabolic stress, resulting in increased tumor growth and decreased patient survival.
    DOI:  https://doi.org/10.1158/0008-5472.CAN-23-1012