1
|
Edavettal S, Cejudo-Martin P, Dasgupta B, Yang D, Buschman MD, Domingo D, Van Kolen K, Jaiprasat P, Gordon R, Schutsky K, Geist B, Taylor N, Soubrane CH, Van Der Helm E, LaCombe A, Ainekulu Z, Lacy E, Aligo J, Ho J, He Y, Lebowitz PF, Patterson JT, Scheer JM, Singh S. Enhanced delivery of antibodies across the blood-brain barrier via TEMs with inherent receptor-mediated phagocytosis. MED 2022; 3:860-882.e15. [PMID: 36257298 DOI: 10.1016/j.medj.2022.09.007] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2021] [Revised: 06/28/2022] [Accepted: 09/22/2022] [Indexed: 01/04/2023]
Abstract
BACKGROUND The near impermeability of the blood-brain barrier (BBB) and the unique neuroimmune environment of the CNS prevents the effective use of antibodies in neurological diseases. Delivery of biotherapeutics to the brain can be enabled through receptor-mediated transcytosis via proteins such as the transferrin receptor, although limitations such as the ability to use Fc-mediated effector function to clear pathogenic targets can introduce safety liabilities. Hence, novel delivery approaches with alternative clearance mechanisms are warranted. METHODS Binders that optimized transport across the BBB, known as transcytosis-enabling modules (TEMs), were identified using a combination of antibody discovery techniques and pharmacokinetic analyses. Functional activity of TEMs were subsequently evaluated by imaging for the ability of myeloid cells to phagocytose target proteins and cells. FINDINGS We demonstrated significantly enhanced brain exposure of therapeutic antibodies using optimal transferrin receptor or CD98 TEMs. We found that these modules also mediated efficient clearance of tau aggregates and HER2+ tumor cells via a non-classical phagocytosis mechanism through direct engagement of myeloid cells. This mode of clearance potentially avoids the known drawbacks of FcγR-mediated antibody mechanisms in the brain such as the neurotoxic release of proinflammatory cytokines and immune cell exhaustion. CONCLUSIONS Our study reports a new brain delivery platform that harnesses receptor-mediated transcytosis to maximize brain uptake and uses a non-classical phagocytosis mechanism to efficiently clear pathologic proteins and cells. We believe these findings will transform therapeutic approaches to treat CNS diseases. FUNDING This research was funded by Janssen, Pharmaceutical Companies of Johnson & Johnson.
Collapse
|
2
|
Obermajer N, Zwolak A, Van De Ven K, Versmissen S, Brajic A, Petley T, Weinstock D, Aligo J, Yi F, Jarantow S, Schutsky K, Tian K, Lorraine A, Arias DA, Buyens K, Torti V, Menard K, Rogers K, Geist B, Van Heerden M, Chu G, Verbist B, Ongenaert M, Hasler J, Packman K, Shenton J, Brehmer D, Lauring J, Brown RJ, Greger J, Ryan DS, Singh S, Lorenzi MV, Lenox L, Laquerre S. Abstract ND07: JNJ-78306358: A first-in-class bispecific T cell redirecting HLA-G antibody. Cancer Res 2022. [DOI: 10.1158/1538-7445.am2022-nd07] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
JNJ-78306358 is a first-in-class bispecific antibody (bsAb), engineered using the Zymeworks Azymetric™ platform, to treat advanced stage solid tumors. Human leukocyte antigen G (HLA-G) is a non-classical major histocompatibility class I molecule with an immune tolerance role at the maternal-fetal interface. HLA-G has limited normal tissue expression, mainly detected in placenta and pituitary gland. However, HLA-G is expressed in multiple human cancers, with a potential role in cancer immune evasion. Comprehensive immunohistochemistry analysis of patient-derived tumors revealed high prevalence of HLA-G expression in renal cell carcinoma (RCC, 75%), ovarian (61%), colon (64%) and rectal cancers (40%), and moderate HLA-G expression prevalence in lung adenocarcinoma, endometrial, and pancreatic cancer. JNJ-78306358 induces HLA-G-expressing tumor cell killing via T cell redirection. This bsAb features an anti-HLA-G single-chain fragment variable (scFv) domain that binds with high affinity (KD ~ 13 pM) to HLA-G on tumor cells and a Fab domain that binds with weaker affinity (KD ~22 nM) to the epsilon subunit of the cluster of differentiation 3 (CD3ε). The immunoglobulin (Ig)G1 heavy chains feature Fc region mutations that disrupt interaction with Fcγ receptors. JNJ-78306358 demonstrated potent PBMC- and T cell-mediated in vitro cytotoxicity (EC50 10.4 - 442.3 pM) against endogenous membrane HLA-G-expressing tumor cell lines and absence of killing against cancer cells lacking HLA-G membrane expression, highlighting the specificity against antigen-expressing tumor cells. JNJ-78306358 exhibited hallmarks of T cell engagement in vitro, including T cell proliferation and cytokine release. In addition, JNJ-78306358 showed HLA-G-expression-dependent anti-tumor activity in mice (humanized with human donor CD3+ pan-T cells or human umbilical cord-blood-derived CD34+ hematopoietic stem cells [HSCs]) bearing cell line- and patient-derived tumors. In these xenograft models, a dose-dependent increase in CD4+ and CD8+ T cell infiltration into tumors was observed with complete tumor regressions at low doses of JNJ-78306358 (0.03 mg/kg). JNJ-78306358’s safety, tolerability and preliminary anti-tumor activity are currently being evaluated in a first-in-human phase I study in advanced stage solid tumors with high prevalence of HLA-G protein expression (NCT04991740). This antigen-targeting approach may address an unmet medical need in patients with tumors expressing HLA-G.
Citation Format: Nataša Obermajer, Adam Zwolak, Kelly Van De Ven, Shana Versmissen, Aleksandra Brajic, Ted Petley, Dan Weinstock, Jason Aligo, Fang Yi, Stephen Jarantow, Keith Schutsky, Ken Tian, Angelilo Lorraine, Diana Alvarez Arias, Kristel Buyens, Vince Torti, Krista Menard, Katharine Rogers, Brian Geist, Marjolein Van Heerden, Gerald Chu, Bie Verbist, Maté Ongenaert, Julien Hasler, Kathryn Packman, Jacintha Shenton, Dirk Brehmer, Josh Lauring, Regina J. Brown, James Greger, Daphne Salick Ryan, Sanjaya Singh, Matthew V. Lorenzi, Laurie Lenox, Sylvie Laquerre. JNJ-78306358: A first-in-class bispecific T cell redirecting HLA-G antibody [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2022; 2022 Apr 8-13. Philadelphia (PA): AACR; Cancer Res 2022;82(12_Suppl):Abstract nr ND07.
Collapse
|
3
|
Chacon JA, Schutsky K, Powell DJ. The Impact of Chemotherapy, Radiation and Epigenetic Modifiers in Cancer Cell Expression of Immune Inhibitory and Stimulatory Molecules and Anti-Tumor Efficacy. Vaccines (Basel) 2016; 4:E43. [PMID: 27854240 PMCID: PMC5192363 DOI: 10.3390/vaccines4040043] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2016] [Revised: 10/17/2016] [Accepted: 11/01/2016] [Indexed: 12/19/2022] Open
Abstract
Genomic destabilizers, such as radiation and chemotherapy, and epigenetic modifiers are used for the treatment of cancer due to their apoptotic effects on the aberrant cells. However, these therapies may also induce widespread changes within the immune system and cancer cells, which may enable tumors to avoid immune surveillance and escape from host anti-tumor immunity. Genomic destabilizers can induce immunogenic death of tumor cells, but also induce upregulation of immune inhibitory ligands on drug-resistant cells, resulting in tumor progression. While administration of immunomodulatory antibodies that block the interactions between inhibitory receptors on immune cells and their ligands on tumor cells can mediate cancer regression in a subset of treated patients, it is crucial to understand how genomic destabilizers alter the immune system and malignant cells, including which inhibitory molecules, receptors and/or ligands are upregulated in response to genotoxic stress. Knowledge gained in this area will aid in the rational design of trials that combine genomic destabilizers, epigenetic modifiers and immunotherapeutic agents that may be synergized to improve clinical responses and prevent tumor escape from the immune system. Our review article describes the impact genomic destabilizers, such as radiation and chemotherapy, and epigenetic modifiers have on anti-tumor immunity and the tumor microenvironment. Although genomic destabilizers cause DNA damage on cancer cells, these therapies can also have diverse effects on the immune system, promote immunogenic cell death or survival and alter the cancer cell expression of immune inhibitor molecules.
Collapse
|
4
|
Panjwani MK, Smith JB, Schutsky K, Gnanandarajah J, O'Connor CM, Powell DJ, Mason NJ. Feasibility and Safety of RNA-transfected CD20-specific Chimeric Antigen Receptor T Cells in Dogs with Spontaneous B Cell Lymphoma. Mol Ther 2016; 24:1602-14. [PMID: 27401141 DOI: 10.1038/mt.2016.146] [Citation(s) in RCA: 90] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2016] [Accepted: 07/05/2016] [Indexed: 12/21/2022] Open
Abstract
Preclinical murine models of chimeric antigen receptor (CAR) T cell therapy are widely applied, but are greatly limited by their inability to model the complex human tumor microenvironment and adequately predict safety and efficacy in patients. We therefore sought to develop a system that would enable us to evaluate CAR T cell therapies in dogs with spontaneous cancers. We developed an expansion methodology that yields large numbers of canine T cells from normal or lymphoma-diseased dogs. mRNA electroporation was utilized to express a first-generation canine CD20-specific CAR in expanded T cells. The canine CD20 (cCD20) CAR expression was efficient and transient, and electroporated T cells exhibited antigen-specific interferon-gamma (IFN-γ) secretion and lysed cCD20+ targets. In a first-in-canine study, autologous cCD20-ζ CAR T cells were administered to a dog with relapsed B cell lymphoma. Treatment was well tolerated and led to a modest, but transient, antitumor activity, suggesting that stable CAR expression will be necessary for durable clinical remissions. Our study establishes the methodologies necessary to evaluate CAR T cell therapy in dogs with spontaneous malignancies and lays the foundation for use of outbred canine cancer patients to evaluate the safety and efficacy of next-generation CAR therapies and their optimization prior to translation into humans.
Collapse
|
5
|
Lynn RC, Feng Y, Schutsky K, Poussin M, Kalota A, Dimitrov DS, Powell DJ. High-affinity FRβ-specific CAR T cells eradicate AML and normal myeloid lineage without HSC toxicity. Leukemia 2016; 30:1355-64. [PMID: 26898190 PMCID: PMC4889499 DOI: 10.1038/leu.2016.35] [Citation(s) in RCA: 94] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2015] [Revised: 12/18/2015] [Accepted: 02/02/2016] [Indexed: 12/19/2022]
Abstract
Acute myeloid leukemia (AML) is an aggressive malignancy, and development of new treatments to prolong remissions is warranted. Chimeric antigen receptor (CAR) T-cell therapies appear promising but on-target, off-tumor recognition of antigen in healthy tissues remains a concern. Here we isolated a high-affinity (HA) folate receptor beta (FRβ)-specific single-chain variable fragment (2.48 nm KD) for optimization of FRβ-redirected CAR T-cell therapy for AML. T cells stably expressing the HA-FRβ CAR exhibited greatly enhanced antitumor activity against FRβ(+) AML in vitro and in vivo compared with a low-affinity FRβ CAR (54.3 nm KD). Using the HA-FRβ immunoglobulin G, FRβ expression was detectable in myeloid-lineage hematopoietic cells; however, expression in CD34(+) hematopoietic stem cells (HSCs) was nearly undetectable. Accordingly, HA-FRβ CAR T cells lysed mature CD14(+) monocytes, while HSC colony formation was unaffected. Because of the potential for elimination of mature myeloid lineage, mRNA CAR electroporation for transient CAR expression was evaluated. mRNA-electroporated HA-FRβ CAR T cells retained effective antitumor activity in vitro and in vivo. Together, our results highlight the importance of antibody affinity in target protein detection and CAR development and suggest that transient delivery of potent HA-FRβ CAR T cells is highly effective against AML and reduces the risk for long-term myeloid toxicity.
Collapse
|
6
|
Smith JB, Panjwani MK, Schutsky K, Gnanandarajah J, Calhoun S, Cooper L, Mason N, Powell DJ. Feasibility and safety of cCD20 RNA CAR-bearing T cell therapy for the treatment of canine B cell malignancies. J Immunother Cancer 2015. [PMCID: PMC4646055 DOI: 10.1186/2051-1426-3-s2-p123] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
|
7
|
Schutsky K, Song DG, Lynn R, Smith JB, Poussin M, Figini M, Zhao Y, Powell DJ. Rigorous optimization and validation of potent RNA CAR T cell therapy for the treatment of common epithelial cancers expressing folate receptor. Oncotarget 2015; 6:28911-28. [PMID: 26359629 PMCID: PMC4745700 DOI: 10.18632/oncotarget.5029] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2015] [Accepted: 08/20/2015] [Indexed: 01/08/2023] Open
Abstract
Using lentiviral technology, we recently demonstrated that incorporation of CD27 costimulation into CARs greatly improves antitumor activity and T cell persistence. Still, virus-mediated gene transfer is expensive, laborious and enables long-term persistence, creating therapies which cannot be easily discontinued if toxic. To address these concerns, we utilized a non-integrating RNA platform to engineer human T cells to express FRα-specific, CD27 CARs and tested their capacity to eliminate human FRα(+) cancer. Novel CARs comprised of human components were constructed, C4-27z and C4opt-27z, a codon-optimized variant created for efficient expression. Following RNA electroporation, C4-27z and C4opt-27z CAR expression is initially ubiquitous but progressively declines across T cell populations. In addition, C4-27z and C4opt-27z RNA CAR T cells secrete high levels of Th-1 cytokines and display strong cytolytic function against human FRα(+) cancers in a time- and antigen-dependent manner. Further, C4-27z and C4opt-27z CAR T cells exhibit significant proliferation in vivo, facilitate the complete regression of fully disseminated human ovarian cancer xenografts in mice and reduce the progression of solid ovarian cancer. These results advocate for rapid progression of C4opt-27z RNA CAR to the clinic and establish a new paradigm for preclinical optimization and validation of RNA CAR candidates destined for clinical translation.
Collapse
MESH Headings
- Animals
- Carcinoma, Ovarian Epithelial
- Cell Line, Tumor
- Cell Proliferation
- Combined Modality Therapy
- Cytokines/immunology
- Cytokines/metabolism
- Cytotoxicity, Immunologic
- Electroporation
- Female
- Folate Receptor 1/immunology
- Folate Receptor 1/metabolism
- Gene Expression Regulation
- Genetic Therapy/methods
- Humans
- Immunotherapy, Adoptive/methods
- Lymphocytes, Tumor-Infiltrating/immunology
- Lymphocytes, Tumor-Infiltrating/metabolism
- Lymphocytes, Tumor-Infiltrating/transplantation
- Mice, Inbred NOD
- Mice, SCID
- Neoplasms, Glandular and Epithelial/genetics
- Neoplasms, Glandular and Epithelial/immunology
- Neoplasms, Glandular and Epithelial/metabolism
- Neoplasms, Glandular and Epithelial/pathology
- Neoplasms, Glandular and Epithelial/therapy
- Ovarian Neoplasms/genetics
- Ovarian Neoplasms/immunology
- Ovarian Neoplasms/metabolism
- Ovarian Neoplasms/pathology
- Ovarian Neoplasms/therapy
- Phenotype
- RNA/genetics
- RNA/metabolism
- Single-Chain Antibodies/genetics
- Single-Chain Antibodies/immunology
- Single-Chain Antibodies/metabolism
- T-Lymphocytes/immunology
- T-Lymphocytes/metabolism
- T-Lymphocytes/transplantation
- Time Factors
- Transfection
- Tumor Burden
- Tumor Necrosis Factor Receptor Superfamily, Member 7/genetics
- Tumor Necrosis Factor Receptor Superfamily, Member 7/immunology
- Tumor Necrosis Factor Receptor Superfamily, Member 7/metabolism
- Xenograft Model Antitumor Assays
Collapse
|
8
|
Schutsky K, Portocarrero C, Hooper DC, Dietzschold B, Faber M. Limited brain metabolism changes differentiate between the progression and clearance of rabies virus. PLoS One 2014; 9:e87180. [PMID: 24763072 PMCID: PMC3998930 DOI: 10.1371/journal.pone.0087180] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2013] [Accepted: 12/19/2013] [Indexed: 12/25/2022] Open
Abstract
Central nervous system (CNS) metabolic profiles were examined from rabies virus (RABV)-infected mice that were either mock-treated or received post-exposure treatment (PET) with a single dose of the live recombinant RABV vaccine TriGAS. CNS tissue harvested from mock-treated mice at middle and late stage infection revealed numerous changes in energy metabolites, neurotransmitters and stress hormones that correlated with replication levels of viral RNA. Although the large majority of these metabolic changes were completely absent in the brains of TriGAS-treated mice most likely due to the strong reduction in virus spread, TriGAS treatment resulted in the up-regulation of the expression of carnitine and several acylcarnitines, suggesting that these compounds are neuroprotective. The most striking change seen in mock-treated RABV-infected mice was a dramatic increase in brain and serum corticosterone levels, with the later becoming elevated before clinical signs or loss of body weight occurred. We speculate that the rise in corticosterone is part of a strategy of RABV to block the induction of immune responses that would otherwise interfere with its spread. In support of this concept, we show that pharmacological intervention to inhibit corticosterone biosynthesis, in the absence of vaccine treatment, significantly reduces the pathogenicity of RABV. Our results suggest that widespread metabolic changes, including hypothalamic-pituitary-adrenal axis activation, contribute to the pathogenesis of RABV and that preventing these alterations early in infection with PET or pharmacological blockade helps protect brain homeostasis, thereby reducing disease mortality.
Collapse
|
9
|
Garcia S, Portocarrero C, Kean R, Schutsky K, Hooper D. Immune memory in the CNS (P1177). THE JOURNAL OF IMMUNOLOGY 2013. [DOI: 10.4049/jimmunol.190.supp.50.31] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Abstract
Due to specialized neurovasculature, referred to as the blood-brain barrier (BBB), CNS tissues are immunologically privileged and only infiltrated by lymphocytes under certain circumstances. One of these is the clearance of attenuated rabies virus (RABV) from the CNS which is dependent upon CD4 T and B cell entry into CNS tissues and local production of virus neutralizing antibody (VNA). Despite spread to the CNS, these processes do not occur during wild-type RABV infection. Differences in the spread and induction of immunity to different RABV in mice allow us to determine if immune effector accumulation in CNS tissues results in the establishment of immune memory in this location. The attenuated recombinant RABV TriGAS has a severely curtailed ability to spread and does not reach the CNS when administered to the gastrocnemius. Mice infected with TriGAS via this route are fully protected against a peripheral challenge with wild-type RABV but not against intra-nasal infection with the same virus. Protection against a CNS challenge with wild-type RABV is only established by vaccination regimens that deliver RABV-specific immune effectors to the CNS. Lymphocytes remain in the CNS for extended periods of time following clearance of attenuated virus and appear to rapidly divide upon local challenge with wild-type RABV. This suggests that these cells may represent CNS resident immune memory cells capable of reactivating to produce VNA upon local challenge.
Collapse
|
10
|
Schutsky K, Curtis D, Bongiorno EK, Barkhouse DA, Kean RB, Dietzschold B, Hooper DC, Faber M. Intramuscular inoculation of mice with the live-attenuated recombinant rabies virus TriGAS results in a transient infection of the draining lymph nodes and a robust, long-lasting protective immune response against rabies. J Virol 2013; 87:1834-41. [PMID: 23192867 PMCID: PMC3554143 DOI: 10.1128/jvi.02589-12] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2012] [Accepted: 11/19/2012] [Indexed: 12/25/2022] Open
Abstract
A single intramuscular application of the live but not UV-inactivated recombinant rabies virus (RABV) variant TriGAS in mice induces the robust and sustained production of RABV-neutralizing antibodies that correlate with long-term protection against challenge with an otherwise lethal dose of the wild-type RABV. To obtain insight into the mechanism by which live TriGAS induces long-lasting protective immunity, quantitative PCR (qPCR) analysis of muscle tissue, draining lymph nodes, spleen, spinal cord, and brain at different times after TriGAS inoculation revealed the presence of significant copy numbers of RABV-specific RNA in muscle, lymph node, and to a lesser extent, spleen for several days postinfection. Notably, no significant amounts of RABV RNA were detected in brain or spinal cord at any time after TriGAS inoculation. Differential qPCR analysis revealed that the RABV-specific RNA detected in muscle is predominantly genomic RNA, whereas RABV RNA detected in draining lymph nodes is predominantly mRNA. Comparison of genomic RNA and mRNA obtained from isolated lymph node cells showed the highest mRNA-to-genomic-RNA ratios in B cells and dendritic cells (DCs), suggesting that these cells represent the major cell population that is infected in the lymph node. Since RABV RNA declined to undetectable levels by 14 days postinoculation of TriGAS, we speculate that a transient infection of DCs with TriGAS may be highly immunostimulatory through mechanisms that enhance antigen presentation. Our results support the superior efficacy and safety of TriGAS and advocate for its utility as a vaccine.
Collapse
|
11
|
Schutsky K, Ouyang M, Thomas SA. Xamoterol impairs hippocampus-dependent emotional memory retrieval via Gi/o-coupled β2-adrenergic signaling. Learn Mem 2011; 18:598-604. [PMID: 21878527 DOI: 10.1101/lm.2302811] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Xamoterol, a partial β(1)-adrenergic receptor agonist, has been reported to impair the retrieval of hippocampus-dependent spatial reference memory in rats. In contrast, xamoterol restores memory retrieval in gene-targeted mice lacking norepinephrine (NE) and in a transgenic mouse model of Down syndrome in which NE levels are reduced. Restoration of retrieval by xamoterol in these two models complements the observation that NE and β(1) signaling are required for hippocampus-dependent retrieval of contextual and spatial reference memory in wild-type mice and rats. Additional evidence indicates that cAMP-mediated PKA and Epac signaling are required for the retrieval of hippocampus-dependent memory. As a result, we hypothesized that xamoterol has effects in addition to the stimulation of β(1) receptors that, at higher doses, act to counter the effects of β(1) signaling. Here we report that xamoterol-induced disruption of memory retrieval depends on β(2)-adrenergic receptor signaling. Interestingly, the impairment of memory retrieval by xamoterol is blocked by pretreatment with pertussis toxin, an uncoupling agent for G(i/o) signaling, suggesting that β(2) signaling opposes β(1) signaling during memory retrieval at the level of G protein and cAMP signaling. Finally, similar to the time-dependent roles for NE, β(1), and cAMP signaling in hippocampus-dependent memory retrieval, xamoterol only impairs retrieval for several days after training, indicating that its effects are also limited by the age of the memory. We conclude that the disruption of memory retrieval by xamoterol is mediated by G(i/o)-coupled β(2) signaling, which opposes the G(s)-coupled β(1) signaling that is transiently required for hippocampus-dependent emotional memory retrieval.
Collapse
|
12
|
Murchison CF, Schutsky K, Jin SH, Thomas SA. Norepinephrine and ß₁-adrenergic signaling facilitate activation of hippocampal CA1 pyramidal neurons during contextual memory retrieval. Neuroscience 2011; 181:109-16. [PMID: 21377513 DOI: 10.1016/j.neuroscience.2011.02.049] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2011] [Revised: 02/17/2011] [Accepted: 02/20/2011] [Indexed: 10/18/2022]
Abstract
We previously described a role for adrenergic signaling in the hippocampus to promote contextual and spatial memory retrieval. A subsequent study performing expression analysis of the immediate-early gene (IEG) Arc suggested that activation of CA1 but not CA3 pyramidal neurons during memory retrieval is impaired in the absence of NE. The current study sought to confirm and extend those observations by performing expression analysis of a second IEG product, Fos, following a much greater variety of testing conditions. In mutant mice lacking NE, induction of Fos was normal in all regions of the hippocampus and amygdala shortly after fear conditioning. In contrast, when testing contextual fear 1 day after training, induction of Fos in CA1 and the central nucleus of the amygdala (CeA), but not CA3, the dentate gyrus or other amygdaloid nuclei, was impaired in the mutant mice. This pattern corresponded to the memory retrieval deficit exhibited by these mice. On the other hand, induction was normal in CA1 and CeA when testing cued fear 1 day after training, or contextual fear 1 week or 1 month after training, conditions in which retrieval are normal in the absence of NE. Acute restoration of NE in the mutant mice before testing but not before training rescued retrieval of contextual fear and restored Fos induction in CA1 and CeA. Because NE facilitates retrieval through the activation of β(1)-adrenergic receptors, β(1) knockout mice were also examined and found to exhibit reduced induction of Fos in CA1 and CeA following retrieval. Based on these and previous results, we hypothesize that adrenergic signaling is critical for the full activation of CA1 pyramidal neurons in response to excitatory input from CA3 pyramidal neurons conveying retrieved contextual information.
Collapse
|
13
|
Gold DV, Modrak DE, Schutsky K, Cardillo TM. Combined 90Yttrium-DOTA-labeled PAM4 antibody radioimmunotherapy and gemcitabine radiosensitization for the treatment of a human pancreatic cancer xenograft. Int J Cancer 2004; 109:618-26. [PMID: 14991585 DOI: 10.1002/ijc.20004] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
We have examined the application of (90)Y-DOTA-cPAM4, anti-MUC1 IgG, in combination with the front-line drug gemcitabine as a potential therapeutic for pancreatic cancer. Athymic nude mice bearing CaPan1 human pancreatic cancer xenografts were administered 2 mg of gemcitabine on days 0, 3, 6, 9 and 12 with concurrent (90)Y-DOTA-cPAM4 (100 microCi) provided on day 0. A second group of mice received a second cycle of treatment 5 weeks after the start of the first cycle. Control groups of mice included those that received either treatment arm alone, the combined modality treatment employing a nontargeting control antibody (hLL2, anti-B-cell lymphoma) and a final group that was left untreated. Gemcitabine administered as a single agent provided no antitumor effect. A single cycle of the combined (90)Y-DOTA-cPAM4 and gemcitabine treatment provided greater inhibition of tumor growth than was observed for any of the other treatment procedures. Tumor growth was delayed for a period of 7 weeks. Two cycles of gemcitabine with concomitant (90)Y-DOTA-cPAM4 yielded significant tumor regression and increased median survival to 21 weeks vs. 12 weeks for mice receiving a single cycle of therapy (p<0.024). Median tumor volume doubling-times were 18 weeks in mice treated with 2-cycles of therapy vs. 7 weeks in mice given only 1-cycle (p<0.001), and 3.5 weeks for the group that received 2-cycles of gemcitabine concomitant with equitoxic nontargeting (90)Y-DOTA-hLL2 (p<0.001). These data suggest that addition of (90)Y-DOTA-cPAM4 RAIT to a gemcitabine treatment regimen may provide enhanced antitumor efficacy for the treatment of pancreatic cancer.
Collapse
|
14
|
Gold DV, Schutsky K, Modrak D, Cardillo TM. Low-dose radioimmunotherapy ((90)Y-PAM4) combined with gemcitabine for the treatment of experimental pancreatic cancer. Clin Cancer Res 2003; 9:3929S-37S. [PMID: 14506191] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/27/2023]
Abstract
PURPOSE Monoclonal antibody PAM4 is reactive with the MUC1 mucin as expressed by >85% of human pancreatic cancers. Significant antitumor effects have been demonstrated using radiolabeled PAM4 for radioimmunotherapy (RAIT) of experimental pancreatic cancer. The goal of the present study was to determine whether the addition of low-dose (90)Y-PAM4 RAIT to a clinically relevant regimen of gemcitabine chemotherapy would provide enhanced antitumor efficacy over that observed by chemotherapy alone without the addition of significant toxicity to normal tissues. EXPERIMENTAL DESIGN Mice bearing human pancreatic tumor xenografts (CaPan1) were administered three cycles of gemcitabine chemotherapy (1000 mg/m(2)/week for 3 weeks with 1 week off) concomitant with (90)Y-labeled PAM4 RAIT (25 micro Ci; 10% of the single agent MTD) given at weeks 0, 4, and 7. Control groups of mice received chemotherapy alone, (90)Y-PAM4 RAIT alone, or an equidose of (90)Y-labeled nontargeting control antibody with and without gemcitabine. RESULTS Mice that received (90)Y-PAM4 RAIT with gemcitabine had tumors that were significantly smaller in size than all of the other treatment groups (P < 0.005). A median survival of 24 weeks was achieved in mice that received the combined treatment versus 10 weeks for mice that received only gemcitabine (P < 0.001) and 16 weeks for mice that received only (90)Y-PAM4 RAIT (P < 0.040). The combined treatment regimen was well tolerated. CONCLUSIONS A combined chemoimmunotherapy and RAIT approach using gemcitabine and low-dose (90)Y-PAM4 provided significantly increased antitumor efficacy than was observed for each treatment arm given alone. Importantly, the enhanced antitumor efficacy was achieved with minimal toxicity to normal tissues. These studies provide justification for clinical trials using the combined modality treatment for patients with pancreatic cancer.
Collapse
|