Ultrasound-Induced Microbubble Cavitation Combined with Paclitaxel-Loaded Nanoparticles for the Elimination of PC-3 Cells in vitro

Nano LIFE ◽  
2021 ◽  
Author(s):  
Ziqi Wang ◽  
Chuanrong Chen ◽  
Penglin Zou ◽  
Yuchen Tao ◽  
Feng Gao ◽  
...  
Keyword(s):  
Prostate Cancer ◽  
Therapeutic Effects ◽  
Chemotherapeutic Drugs ◽  
Castration Resistant Prostate Cancer ◽  
Inhibition Of Proliferation ◽  
Drug Delivery Carrier ◽  
Castration Resistant ◽  
Proliferation And Apoptosis ◽  
Apoptosis Inhibitor

Castration-resistant prostate cancer (CRPC) and its metastases are the main reasons for the high mortality of prostate cancer. Currently, paclitaxel (PTX)-based chemotherapeutics are used as first-line drugs to treat CRPC, but this treatment does not show good effects and is accompanied by serious side effects, which may be because intravenously injected chemotherapeutic drugs have difficulties gathering at the tumor site. Therefore, a safe and effective drug delivery carrier is urgently needed to enhance the therapeutic effects of chemotherapeutic drugs against CRPC. Methoxy polyethylene glycol-polylacticco-glycolic acid-polylysine (mPEG-PLGA-PLL) nanoparticles (NPs) have shown high drug encapsulation efficiency and good therapeutic effects against ovarian cancer and pancreatic cancer, but there are few studies on their treatment against CRPC. To expand the applications of mPEG-PLGA-PLL NPs, in this study, mPEG-PLGA-PLL NPs loaded with PTX (PTX-NPs) were synthesized. The synthesized PTX-NPs had a uniform particle size and no obvious aggregation. PTX-NPs can be uptaked by PC-3 cells, which significantly promotes the inhibition of proliferation and apoptosis effects of PTX on cells and reduces the expression levels of CDK6, Cyclin D1 and Bcl-2 (cyclins and an apoptosis inhibitor), and these effects can be further enhanced by ultrasound-induced microbubble cavitation (UIMC). Our research provides a new nanocarrier for the treatment of CRPC, laying the foundation for further research in the future.

scholarly journals MicroRNA-1205 Regulation of FRYL in Prostate Cancer

2021 ◽  
Vol 9 ◽  
Author(s):  
Michelle Naidoo ◽  
Fayola Levine ◽  
Tamara Gillot ◽  
Akintunde T. Orunmuyi ◽  
E. Oluwabunmi Olapade-Olaopa ◽  
...  
Keyword(s):  
Prostate Cancer ◽  
Neuroendocrine Differentiation ◽  
Castration Resistant Prostate Cancer ◽  
Chromosomal Locus ◽  
Protein Coding ◽  
Castration Resistant ◽  
Dendritic Branching ◽  
Very High

High mortality rates of prostate cancer (PCa) are associated with metastatic castration-resistant prostate cancer (CRPC) due to the maintenance of androgen receptor (AR) signaling despite androgen deprivation therapies (ADTs). The 8q24 chromosomal locus is a region of very high PCa susceptibility that carries genetic variants associated with high risk of PCa incidence. This region also carries frequent amplifications of the PVT1 gene, a non-protein coding gene that encodes a cluster of microRNAs including, microRNA-1205 (miR-1205), which are largely understudied. Herein, we demonstrate that miR-1205 is underexpressed in PCa cells and tissues and suppresses CRPC tumors in vivo. To characterize the molecular pathway, we identified and validated fry-like (FRYL) as a direct molecular target of miR-1205 and observed its overexpression in PCa cells and tissues. FRYL is predicted to regulate dendritic branching, which led to the investigation of FRYL in neuroendocrine PCa (NEPC). Resistance toward ADT leads to the progression of treatment related NEPC often characterized by PCa neuroendocrine differentiation (NED), however, this mechanism is poorly understood. Underexpression of miR-1205 is observed when NED is induced in vitro and inhibition of miR-1205 leads to increased expression of NED markers. However, while FRYL is overexpressed during NED, FRYL knockdown did not reduce NED, therefore revealing that miR-1205 induces NED independently of FRYL.

scholarly journals Crosstalk Between Nuclear MET and SOX9/β-Catenin Correlates with Castration-Resistant Prostate Cancer

2014 ◽  
Vol 28 (10) ◽  
pp. 1629-1639 ◽  
Author(s):  
Yingqiu Xie ◽  
Wenfu Lu ◽  
Shenji Liu ◽  
Qing Yang ◽  
Brett S. Carver ◽  
...  
Keyword(s):  
Prostate Cancer ◽  
Combined Treatment ◽  
Castration Resistant Prostate Cancer ◽  
Ablation Therapy ◽  
Androgen Ablation ◽  
Castration Resistant ◽  
Activate Cell ◽  
Androgen Ablation Therapy

Castration-resistant prostate cancer (PCa) (CRPC) is relapse after various forms of androgen ablation therapy and causes a major mortality in PCa patients, yet the mechanism remains poorly understood. Here, we report the nuclear form of mesenchymal epithelial transition factor (nMET) is essential for CRPC. Specifically, nMET is remarkably increased in human CRPC samples compared with naïve samples. Androgen deprivation induces endogenous nMET and promotes cell proliferation and stem-like cell self-renewal in androgen-nonresponsive PCa cells. Mechanistically, nMET activates SRY (sex determining region Y)-box9, β-catenin, and Nanog homeobox and promotes sphere formation in the absence of androgen stimulus. Combined treatment of MET and β-catenin enhances the inhibition of PCa cell growth. Importantly, MET accumulation is detected in nucleus of recurrent prostate tumors of castrated Pten/Trp53 null mice, whereas MET elevation is predominantly found in membrane of naïve tumors. Our findings reveal for the first time an essential role of nMET association with SOX9/β-catenin in CRPC in vitro and in vivo, highlighting that nuclear RTK activate cell reprogramming to drive recurrence, and targeting nMET would be a new avenue to treat recurrent cancers.

Salvage chemotherapy with cisplatin, ifosfamide, and paclitaxel in metastatic castration-resistant prostate cancer.

2021 ◽  
Vol 39 (6_suppl) ◽  
pp. 123-123
Author(s):  
Gunhild Von Amsberg ◽  
Mirjam Zilles ◽  
Philipp Gild ◽  
Winfried Alsdorf ◽  
Lukas Boeckelmann ◽  
...  
Keyword(s):  
Prostate Cancer ◽  
Synergistic Effects ◽  
Antagonistic Effect ◽  
University Hospital ◽  
Additive Effects ◽  
Castration Resistant Prostate Cancer ◽  
Castration Resistant ◽  
Platinum Based Chemotherapy ◽  
Wide Range

123 Background: Recent developments in the treatment of metastatic castration resistant prostate cancer (mCRPC) lead to a revival of platinum-based chemotherapy demonstrating increased activity in patients with aggressive variants of disease. Here, we report on the results of a combinational salvage therapy with cisplatin, ifosfamide and paclitaxel (TIP) in mCRPC. Methods: We retrospectively analyzed patients with mCRPC treated with TIP at the University Hospital Hamburg-Eppendorf between November 2013 and September 2020. Accompanying in vitro analyses were performed using human prostate carcinoma cell lines harboring different levels of drug resistance including the docetaxel-resistant sublines PC3-DR and DU45-DR. Results: In total, 17 mCRPC patients treated with TIP were eligible for efficacy analyses with a median age of 65 yrs. At baseline, liver metastases were present in 88%, metastases of other visceral sides (lung, adrenal gland, brain) in 47% and bone metastases in 76% of the patients. Median hemoglobin was 9.8mg/dl, LDH 903 U/l and AP 205 U/l. Median PSA value was 77 ng/ml covering a wide range including three patients with a PSA-value below 1ng/ml. NSE was evaluated in 83% of the patients (median 38,5 U/l). Patients were extensively pretreated with a median of three treatment lines before TIP (100% docetaxel, 82% abirateron and/or enzalutamide, 47% cabazitaxel, 41% others). A median of 3,5 cycles of TIP were applied with 29% of the patients receiving the maximum of 6 cycles. Four patients discontinued treatment due to side effects (PNP, infection, ifosfamide induced psychosis). At interim analyses, 59 % of the patients showed a radiological response or stable disease with only one patient progressing till the end of treatment. Median PFS was 2.5 months, median OS 6 months. A decrease of PSA > 30% and LDH > 50% was observed in 41% and 35% of the patients, respectively. In vitro experiments revealed additive effects of TIP in 22Rv1, LNCaP and DU45 cells and synergistic effects in neuroendocrine LASCPC-01 cells. In PC3 cells, TIP induced antagonistic effects at lower doses, whereas dose-independent additive effects were observed in docetaxel-resistant PC3-DR. Surprisingly, preliminary data of combined therapies with different drug pairs suggest an antagonistic effect of paclitaxel in the combination with both, cisplatin and ifosfamide. Conclusions: Combinational therapy with cisplatin, ifosfamide and paclitaxel showed promising activity in some patients with aggressive mCRPC. Preclinical data suggest that the drug combination of cisplatin and ifosfamide rule the efficacy of TIP in mCRPC.

scholarly journals Inhibition of LOXL2 Enhances the Radiosensitivity of Castration-Resistant Prostate Cancer Cells Associated with the Reversal of the EMT Process

2019 ◽  
Vol 2019 ◽  
pp. 1-10 ◽  
Author(s):  
Peng Xie ◽  
Hongliang Yu ◽  
Feijiang Wang ◽  
Feng Yan ◽  
Xia He
Keyword(s):  
Prostate Cancer ◽  
Cell Apoptosis ◽  
Castration Resistant Prostate Cancer ◽  
Prostate Cancer Cells ◽  
Castration Resistant ◽  
Du145 Cells ◽  
Androgen Independent

Introduction. Radiotherapy is the mainstay in the treatment of prostate cancer. However, significant radioresistance of castration-resistant prostate cancer (CRPC) cells constitutes a main obstacle in the treatment of this disease. By using bioinformatic data mining methods, LOXL2 was found to be upregulated in both androgen-independent prostate cancer cell lines and radioresistant tumor samples collected from patients with prostate cancer. We speculate that LOXL2 may play an important role in the radioresistance of CRPC cells. Methods. The effect of LOXL2 knockdown on the radiosensitivity of androgen-independent prostate cancer cells lines was measured by the clonogenic assay and xenograft tumor experiments under in vitro and in vivo conditions, respectively. In studies on the mechanism, we focused on the EMT phenotype changes and cell apoptosis changes induced by LOXL2 knockdown in DU145 cells. The protein levels of three EMT biomarkers, namely, E-cadherin, vimentin, and N-cadherin, were measured by western blotting and immunohistochemical staining. Cell apoptosis after irradiation was measured by flow cytometry and caspase-3 activity assay. Salvage experiment was also conducted to confirm the possible role of EMT in the radiosensitization effect of LOXL2 knockdown in CRPC cells. Results. LOXL2 knockdown in CRPC cells enhanced cellular radiosensitivity under both in vitro and in vivo conditions. A significant reversal of EMT was observed in LOXL2-silenced DU145 cells. Cell apoptosis after irradiation was significantly enhanced by LOXL2 knockdown in DU145 cells. Results from the salvage experiment confirmed the key role of EMT process reversal in the radiosensitization effect of LOXL2 knockdown in DU145 cells. Conclusions. LOXL2 plays an important role in the development of cellular radioresistance in CRPC cells. Targeting LOXL2 may be a rational avenue to overcome radioresistance in CRPC cells. A LOXL2-targeting strategy for CRPC treatment warrants detailed investigation in the future.

scholarly journals Arginine vasopressin receptor 1a is a therapeutic target for castration-resistant prostate cancer

2019 ◽  
Vol 11 (498) ◽  
pp. eaaw4636 ◽  
Author(s):  
Ning Zhao ◽  
Stephanie O. Peacock ◽  
Chen Hao Lo ◽  
Laine M. Heidman ◽  
Meghan A. Rice ◽  
...  
Keyword(s):  
Prostate Cancer ◽  
Arginine Vasopressin ◽  
Ectopic Expression ◽  
Vasopressin Receptor ◽  
Castration Resistant Prostate Cancer ◽  
Castration Resistance ◽  
Castration Resistant ◽  
Promising Therapeutic Approach

Castration-resistant prostate cancer (CRPC) recurs after androgen deprivation therapy (ADT) and is incurable. Reactivation of androgen receptor (AR) signaling in the low androgen environment of ADT drives CRPC. This AR activity occurs through a variety of mechanisms, including up-regulation of AR coactivators such as VAV3 and expression of constitutively active AR variants such as the clinically relevant AR-V7. AR-V7 lacks a ligand-binding domain and is linked to poor prognosis. We previously showed that VAV3 enhances AR-V7 activity to drive CRPC progression. Gene expression profiling after depletion of either VAV3 or AR-V7 in CRPC cells revealed arginine vasopressin receptor 1a (AVPR1A) as the most commonly down-regulated gene, indicating that this G protein–coupled receptor may be critical for CRPC. Analysis of publicly available human PC datasets showed thatAVPR1Ahas a higher copy number and increased amounts of mRNA in advanced PC. Depletion of AVPR1A in CRPC cells resulted in decreased cell proliferation and reduced cyclin A. In contrast, androgen-dependent PC, AR-negative PC, or nontumorigenic prostate epithelial cells, which have undetectableAVPR1AmRNA, were minimally affected by AVPR1A depletion. Ectopic expression of AVPR1A in androgen-dependent PC cells conferred castration resistance in vitro and in vivo. Furthermore, treatment of CRPC cells with the AVPR1A ligand, arginine vasopressin (AVP), activated ERK and CREB, known promoters of PC progression. A clinically safe and selective AVPR1A antagonist, relcovaptan, prevented CRPC emergence and decreased CRPC orthotopic and bone metastatic growth in mouse models. Based on these preclinical findings, repurposing AVPR1A antagonists is a promising therapeutic approach for CRPC.

scholarly journals Identification of genes required for enzalutamide resistance in castration-resistant prostate cancer cells in vitro

2020 ◽  
pp. molcanther.0244.2020
Author(s):  
Sarah E Kohrt ◽  
Wisam N Awadallah ◽  
Robert A Phillips ◽  
Thomas C. Case ◽  
Renjie Jin ◽  
...  
Keyword(s):  
Prostate Cancer ◽  
Cancer Cells ◽  
Castration Resistant Prostate Cancer ◽  
Prostate Cancer Cells ◽  
Castration Resistant

CYP11A1 inhibition as a therapeutic approach for the treatment of castration resistant prostate cancer.

2018 ◽  
Vol 36 (6_suppl) ◽  
pp. 340-340 ◽  
Author(s):  
Riikka Oksala ◽  
Mari Karimaa ◽  
Outi Simola ◽  
Meri Ramela ◽  
Reetta Riikonen ◽  
...  
Keyword(s):  
Prostate Cancer ◽  
Tumor Growth ◽  
Steroid Hormones ◽  
Castration Resistant Prostate Cancer ◽  
Plasma Acth ◽  
Steroid Synthesis ◽  
Androgen Synthesis ◽  
Castration Resistant ◽  
Toxicological Studies

340 Background: Castration-resistant prostate cancer (CRPC) is a major cause of cancer mortality worldwide. The mechanisms behind the development of resistance are complex and not fully understood; altered androgen synthesis, androgen receptor (AR) overexpression or gene amplification, and mutations have been indentified. However, tumor growth may still be responsive to therapies that can further suppress de novo intratumoral steroid synthesis upstream of CYP17A1. ODM-208 is an oral, non-steroidal and selective inhibitor of CYP11A1 enzyme that suppresses the synthesis of all steroid hormones and their precursors. Methods: The inhibition of CYP11A1 was measured in vitro by the formation of radiolabelled isocapronic acid in a human adrenal cortex cell line (H295R), and further analysing pregnenolone (Preg) and testosterone (T) formation by ELISA. The tumor growth inhibition of ODM-208 alone or in combination with prednisone (Pred) was studied in VCaP CRPC xenograft where also concentrations of main steroid hormones progesterone (P), corticosterone (CORT) and T in tumors and adrenals were analysed. In addition, plasma ACTH and LH levels were measured at the end of the xenograft study. In dogs an ACTH stimulation test was done. Toxicity studies were conducted in rats and dogs. Results: ODM-208 potently inhibits CYP11A1 and synthesis of Preg and T with nM concentrations in vitro. In the VCaP CRPC xenograft ODM-208 alone and in combination with Pred significantly inhibited tumor growth. Concentrations of T, P and CORT were significantly decreased in the adrenals, indicating strong CYP11A1 inhibition. Also, significantly decreased steroid levels in tumors was observedhe Pred combination increased plasma ACTH levels less than ODM-208 alone, whereas no difference was seen in the LH. In dogs ACTH-stimulated cortisol production was significantly inhibited after single oral dose of ODM-208. In toxicological studies ODM-208 showed expected reversible findings in target tissues, mainly related to the pharmacology. Conclusions: ODM-208 shows promising antitumor activity in preclinical CRPC models with favorable toxicological profile. Thus, ODM-208 might have potential for treating the patients with CRPC.

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