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Kamimura HAS, Wu SY, Grondin J, Ji R, Aurup C, Zheng W, Heidmann M, Pouliopoulos AN, Konofagou EE. Real-Time Passive Acoustic Mapping Using Sparse Matrix Multiplication. IEEE TRANSACTIONS ON ULTRASONICS, FERROELECTRICS, AND FREQUENCY CONTROL 2021; 68:164-177. [PMID: 32746182 PMCID: PMC7770101 DOI: 10.1109/tuffc.2020.3001848] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Passive acoustic mapping enables the spatiotemporal monitoring of cavitation with circulating microbubbles during focused ultrasound (FUS)-mediated blood-brain barrier opening. However, the computational load for processing large data sets of cavitation maps or more complex algorithms limit the visualization in real-time for treatment monitoring and adjustment. In this study, we implemented a graphical processing unit (GPU)-accelerated sparse matrix-based beamforming and time exposure acoustics in a neuronavigation-guided ultrasound system for real-time spatiotemporal monitoring of cavitation. The system performance was tested in silico through benchmarking, in vitro using nonhuman primate (NHP) and human skull specimens, and demonstrated in vivo in NHPs. We demonstrated the stability of the cavitation map for integration times longer than 62.5 [Formula: see text]. A compromise between real-time displaying and cavitation map quality obtained from beamformed RF data sets with a size of 2000 ×128 ×30 (axial [Formula: see text]) was achieved for an integration time of [Formula: see text], which required a computational time of 0.27 s (frame rate of 3.7 Hz) and could be displayed in real-time between pulses at PRF = 2 Hz. Our benchmarking tests show that the GPU sparse-matrix algorithm processed the RF data set at a computational rate of [Formula: see text]/pixel/sample, which enables adjusting the frame rate and the integration time as needed. The neuronavigation system with real-time implementation of cavitation mapping facilitated the localization of the cavitation activity and helped to identify distortions due to FUS phase aberration. The in vivo test of the method demonstrated the feasibility of GPU-accelerated sparse matrix computing in a close to a clinical condition, where focus distortions exemplify problems during treatment. These experimental conditions show the need for spatiotemporal monitoring of cavitation with real-time capability that enables the operator to correct or halt the sonication in case substantial aberrations are observed.
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Abstract
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Nanocarriers
(NCs) are promising tools to improve drug delivery
across the blood–brain barrier (BBB) for more effective treatment
of brain disorders, although there is a scarcity of clinical translation
of brain-directed NCs. In order to drive the development of brain-oriented
NCs toward clinical success, it is essential to understand the prerequisites
for nanodelivery to be successful in brain treatment. In this Perspective,
we present how pharmacokinetic/pharmacodynamic (PK/PD), formulation
and nanotoxicity factors impact the therapeutic success of brain-specific
nanodelivery. Properties including high loading efficiency, slow in vivo drug release, long systemic circulation, an increase
in unbound brain-to-plasma concentration/exposure ratio (Kp,uu,brain), high drug potency, and minimal nanotoxicity
are prerequisites that should preferably be combined to maximize the
therapeutic potential of a brain-targeted NC. The PK of brain-directed
NCs needs to be evaluated in a more therapeutically relevant manner,
focusing on the released, unbound drug. It is more crucial to increase
the Kp,uu,brain than to improve the ability
of the NC to cross the BBB in its intact form. Brain-targeted NCs,
which are mostly developed for treating brain tumors, including metastases,
should aim to enhance drug delivery not just to tumor regions with
disrupted BBB, but equally important to regions with intact BBB where
the drugs themselves have problems reaching. This article provides
critical insights into how a brain-targeted nanoformulation needs
to be designed and optimized to achieve therapeutic success in the
brain.
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Affiliation(s)
- Yang Hu
- Translational PKPD Research Group, Department of Pharmacy, Faculty of Pharmacy, Uppsala University, SE-751 23 Uppsala, Sweden
| | - Margareta Hammarlund-Udenaes
- Translational PKPD Research Group, Department of Pharmacy, Faculty of Pharmacy, Uppsala University, SE-751 23 Uppsala, Sweden
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Statistical Design of Experiment (DoE) based development and optimization of DB213 in situ thermosensitive gel for intranasal delivery. Int J Pharm 2018; 539:50-57. [PMID: 29366939 DOI: 10.1016/j.ijpharm.2018.01.032] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2017] [Revised: 01/10/2018] [Accepted: 01/18/2018] [Indexed: 01/03/2023]
Abstract
DB213 is an HIV-1 replication inhibitor targeting the Central Nervous System for the treatment of HIV-associated neurocognitive disorders. Current study aims to develop an in situ thermosensitive gelling system for intranasal delivery of DB213 facilitated by Statistical Design of Experiment (DoE) to conduct a more efficient experimentation by extracting the maximum amount of information from limited experiments. In our current study, information was extracted from twenty-five experimental designs from MODDE® Software and a mathematical model was successfully developed to predict formulations to achieve desired performance as well as to analyze relationships between the amount of Pluronic F-127, Pluronic F-68, Chitosan, DB213 and the performances of in situ thermosensitive gels. Based on DoE, in situ thermosensitive gels of 1% DB213 (F1) and 5% DB213 (F2) were developed for further in vivo bioavailability and brain uptake evaluations in Sprague-Dawley rats and C57BL/6 mice, respectively. In comparison to DB213 water solution, intranasal administrations of F1 at 1 mg/kg in rats and F2 at 25 mg/kg in mice demonstrated relative bioavailabilities of 145% and 165% with significant increase in brain uptake.
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Wang Q, Zhang Y, Wong CH, Edwin Chan HY, Zuo Z. Demonstration of Direct Nose-to-Brain Transport of Unbound HIV-1 Replication Inhibitor DB213 Via Intranasal Administration by Pharmacokinetic Modeling. AAPS JOURNAL 2017; 20:23. [PMID: 29282567 DOI: 10.1208/s12248-017-0179-0] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2017] [Accepted: 12/02/2017] [Indexed: 01/15/2023]
Abstract
Intranasal administration could be an attractive alternative route of administration for the delivery of drugs to the central nervous system (CNS). However, there are always doubts about the direct transport of therapeutics from nasal cavity to the CNS since there are only limited studies on the understanding of direct nose-to-brain transport. Therefore, this study aimed to (1) investigate the existence of nose-to-brain transport of intranasally administered HIV-1 replication inhibitor DB213 and (2) assess the direct nose-to-brain transport of unbound HIV-1 replication inhibitor DB213 quantitatively by a pharmacokinetic approach. Plasma samples were collected up to 6 h post-dosing after administration via intranasal or intravenous route at three bolus doses. In the brain-uptake study, the plasma, whole brain, and cerebrospinal fluid (CSF) were sampled between 15 min and 8 h post-dosing. All samples were analyzed with LC/MS/MS. Plasma, CSF, and brain concentration versus time profiles were analyzed with nonlinear mixed-effect modeling. Structural model building was performed by NONMEM (version VII, level 2.0). Intranasal administration showed better potential to deliver HIV-1 replication inhibitor DB213 to the brain with 290-fold higher brain to plasma ratio compared with intravenous administration. Based on that, a model with two absorption compartments (nose-to-systemic circulation and nose-to-brain) was developed and demonstrated 72.4% of total absorbed unbound HIV-1 replication inhibitor DB213 after intranasal administration was transported directly into the brain through nose-to-brain pathway.
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Affiliation(s)
- Qianwen Wang
- School of Pharmacy, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, People's Republic of China
| | - Yufeng Zhang
- School of Pharmacy, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, People's Republic of China
| | - Chun-Ho Wong
- School of Life Sciences, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, People's Republic of China
| | - H Y Edwin Chan
- School of Life Sciences, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, People's Republic of China.,Gerald Choa Neuroscience Centre, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, People's Republic of China
| | - Zhong Zuo
- School of Pharmacy, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, People's Republic of China.
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Bicker J, Fortuna A, Alves G, Soares-da-Silva P, Falcão A. Elucidation of the Impact of P-glycoprotein and Breast Cancer Resistance Protein on the Brain Distribution of Catechol- O-Methyltransferase Inhibitors. Drug Metab Dispos 2017; 45:1282-1291. [PMID: 28916530 DOI: 10.1124/dmd.117.077883] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2017] [Accepted: 09/13/2017] [Indexed: 12/14/2022] Open
Abstract
P-glycoprotein (P-gp) and breast cancer resistance protein (BCRP) are clinically important efflux transporters that act cooperatively at the blood-brain barrier, limiting the entry of several drugs into the central nervous system (CNS) and affecting their pharmacokinetics, therapeutic efficacy, and safety. In the present study, the interactions of catechol-O-methyltransferase (COMT) inhibitors (BIA 9-1059, BIA 9-1079, entacapone, nebicapone, opicapone, and tolcapone) with P-gp and BCRP were investigated to determine the contribution of these transporters in their access to the brain. In vitro cellular accumulation and bidirectional transport assays were conducted in Madin-Darby canine kidney (MDCK) II, MDCK-MDR1, and MDCK-BCRP cells. In vivo pharmacokinetic studies were carried out for tolcapone and BIA 9-1079 in rats, with and without elacridar, a well-known P-gp and BCRP modulator. The results suggest that BIA 9-1079, nebicapone, and tolcapone inhibit BCRP in a concentration-dependent manner. Moreover, with net flux ratios higher than 2 and decreased over 50% in the presence of verapamil or Ko143, BIA 9-1079 was identified as a P-gp substrate while BIA 9-1059, entacapone, opicapone, and nebicapone were revealed to be BCRP substrates. In vivo, brain exposure was limited for tolcapone and BIA 9-1079, although tolcapone crossed the blood-brain barrier at a greater rate and to a greater extent than BIA 9-1079. The extent of brain distribution of both compounds was significantly increased in the presence of elacridar, attesting to the involvement of efflux transporters. These findings provide relevant information and improve the understanding of the mechanisms that govern the access of these COMT inhibitors to the CNS.
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Affiliation(s)
- Joana Bicker
- Laboratory of Pharmacology, Faculty of Pharmacy (J.B., A.Fo., A.Fa.), and Center for Neuroscience and Cell Biology (J.B., A.Fo., G.A., A.Fa.), University of Coimbra, Coimbra, Portugal; Health Sciences Research Centre, University of Beira Interior, Covilhã, Portugal (G.A.); Department of Research and Development, BIAL, Sao Mamede do Coronado, Portugal (P.S.-d.S.); and Department of Pharmacology and Therapeutics, Faculty of Medicine, University of Porto, Porto, Portugal (P.S.-d.S.)
| | - Ana Fortuna
- Laboratory of Pharmacology, Faculty of Pharmacy (J.B., A.Fo., A.Fa.), and Center for Neuroscience and Cell Biology (J.B., A.Fo., G.A., A.Fa.), University of Coimbra, Coimbra, Portugal; Health Sciences Research Centre, University of Beira Interior, Covilhã, Portugal (G.A.); Department of Research and Development, BIAL, Sao Mamede do Coronado, Portugal (P.S.-d.S.); and Department of Pharmacology and Therapeutics, Faculty of Medicine, University of Porto, Porto, Portugal (P.S.-d.S.)
| | - Gilberto Alves
- Laboratory of Pharmacology, Faculty of Pharmacy (J.B., A.Fo., A.Fa.), and Center for Neuroscience and Cell Biology (J.B., A.Fo., G.A., A.Fa.), University of Coimbra, Coimbra, Portugal; Health Sciences Research Centre, University of Beira Interior, Covilhã, Portugal (G.A.); Department of Research and Development, BIAL, Sao Mamede do Coronado, Portugal (P.S.-d.S.); and Department of Pharmacology and Therapeutics, Faculty of Medicine, University of Porto, Porto, Portugal (P.S.-d.S.)
| | - Patrício Soares-da-Silva
- Laboratory of Pharmacology, Faculty of Pharmacy (J.B., A.Fo., A.Fa.), and Center for Neuroscience and Cell Biology (J.B., A.Fo., G.A., A.Fa.), University of Coimbra, Coimbra, Portugal; Health Sciences Research Centre, University of Beira Interior, Covilhã, Portugal (G.A.); Department of Research and Development, BIAL, Sao Mamede do Coronado, Portugal (P.S.-d.S.); and Department of Pharmacology and Therapeutics, Faculty of Medicine, University of Porto, Porto, Portugal (P.S.-d.S.)
| | - Amílcar Falcão
- Laboratory of Pharmacology, Faculty of Pharmacy (J.B., A.Fo., A.Fa.), and Center for Neuroscience and Cell Biology (J.B., A.Fo., G.A., A.Fa.), University of Coimbra, Coimbra, Portugal; Health Sciences Research Centre, University of Beira Interior, Covilhã, Portugal (G.A.); Department of Research and Development, BIAL, Sao Mamede do Coronado, Portugal (P.S.-d.S.); and Department of Pharmacology and Therapeutics, Faculty of Medicine, University of Porto, Porto, Portugal (P.S.-d.S.)
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Sheikholeslami B, Gholami M, Lavasani H, Rouini M. Evaluation of the route dependency of the pharmacokinetics and neuro-pharmacokinetics of tramadol and its main metabolites in rats. Eur J Pharm Sci 2016; 92:55-63. [PMID: 27365222 DOI: 10.1016/j.ejps.2016.06.021] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2016] [Revised: 06/13/2016] [Accepted: 06/25/2016] [Indexed: 12/14/2022]
Abstract
Tramadol hydrochloride is a centrally acting analgesic used for the treatment of moderate-to-severe pain. It has three main metabolites: O-desmethyltramadol (M1), N-desmethyltramadol (M2), and N,O-didesmethyltramadol (M5). Because of the frequent use of tramadol by patients and drug abusers, the ability to determine the parent drug and its metabolites in plasma and cerebrospinal fluid is of great importance. In the present study, a pharmacokinetic approach was applied using two groups of five male Wistar rats administered a 20mg/kg dose of tramadol via intravenous (i.v.) or intraperitoneal (i.p.) routes. Plasma and CSF samples were collected at 5-360min following tramadol administration. Our results demonstrate that the plasma values of Cmax (C0 in i.v. group) and area under the curve (AUC)0-t for tramadol were 23,314.40±6944.85 vs. 3187.39±760.25ng/mL (Cmax) and 871.15±165.98 vs. 414.04±149.25μg·min/mL in the i.v. and i.p. groups, respectively (p<0.05). However, there were no significant differences between i.v. and i.p. plasma values for tramadol metabolites (p>0.05). Tramadol rapidly penetrated the blood-brain barrier (BBB) and blood-cerebrospinal fluid barrier (BCSFB) (5.00±0.00 vs. 10.00±5.77min in i.v. and i.p. groups, respectively). Tramadol and its metabolites (M1 and M2) were present to a lesser extent in the cerebrospinal fluid (CSF) than in the plasma. M5 hardly penetrated the CSF, owing to its high polarity. There was no significant difference between the AUC0-t of tramadol in plasma (414.04±149.25μg·min/mL) and CSF (221.81±83.02μg·min/mL) in the i.p. group. In addition, the amounts of metabolites (M1 and M2) in the CSF showed no significant differences following both routes of administration. There were also no significant differences among the Kp,uu,CSF(0-360) (0.51±0.12 vs. 0.63±0.04) and Kp,uu,CSF(0-∞) (0.61±0.10 vs. 0.62±0.02) for i.v. and i.p. pathways, respectively (p>0.05). Drug targeting efficiency (DTE) values of tramadol after i.p. injection were more than unity for all scheduled time points. Considering the main analgesic effect of M1, it is hypothesized that both routes of administration may produce the same amount of analgesia.
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Affiliation(s)
| | - Mahdi Gholami
- Department of Toxicology and Pharmacology, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, Iran; Pharmaceutical Sciences Research Centre, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, Iran
| | - Hoda Lavasani
- Biopharmaceutics and Pharmacokinetic Division, Department of Pharmaceutics, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, Iran
| | - Mohammadreza Rouini
- Pharmaceutical Sciences Research Centre, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, Iran; Biopharmaceutics and Pharmacokinetic Division, Department of Pharmaceutics, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, Iran
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Paulzen M, Gründer G, Veselinovic T, Wolf B, Hiemke C, Lammertz SE. Duloxetine enters the brain - But why is it not found in the cerebrospinal fluid. J Affect Disord 2016; 189:159-63. [PMID: 26437230 DOI: 10.1016/j.jad.2015.08.073] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/28/2015] [Revised: 07/31/2015] [Accepted: 08/24/2015] [Indexed: 10/23/2022]
Abstract
BACKGROUND Antidepressants enter the brain to reach their site of action in a different extent. However, there has been no study to date about duloxetine's ability to enter the brain and cerebrospinal fluid. Aim of this study was to measure blood and cerebrospinal fluid concentrations of duloxetine and to account for the distribution between the two compartments. METHODS Concentrations of duloxetine were measured in blood serum and cerebrospinal fluid of 19 patients treated with daily doses of 30-120mg. Daily doses were correlated with serum and cerebrospinal fluid concentrations and serum concentrations were correlated with concentrations in cerebrospinal fluid. RESULTS Serum concentrations of duloxetine showed a moderate but significant correlation with the applied daily dose, r=+0.473, p=0.04. Duloxetine concentrations in the cerebrospinal fluid above the designated limit of quantification of 2.0ng/mL were only found in three of the 19 patients. CONCLUSIONS AND LIMITATIONS Contrasting to own preceding studies on venlafaxine, mirtazapine and citalopram with comparably high concentrations in cerebrospinal fluid, the here presented findings indicate that duloxetine shows a very different distribution pattern. Very low concentrations in the cerebrospinal fluid may be due to the fact that the drug crosses the blood-cerebrospinal fluid barrier much worse than other antidepressants do, suggesting a low ability of duloxetine to enter the brain. Alternatively, low drug concentrations may be interpreted in a sense of a missing residence time in cerebrospinal fluid due to active transport mechanisms out of this environment either back into the bloodstream or into the brain.
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Affiliation(s)
- Michael Paulzen
- Department of Psychiatry, Psychotherapy and Psychosomatics, RWTH Aachen University, Aachen, Germany, and JARA - Translational Brain Medicine.
| | - Gerhard Gründer
- Department of Psychiatry, Psychotherapy and Psychosomatics, RWTH Aachen University, Aachen, Germany, and JARA - Translational Brain Medicine
| | - Tanja Veselinovic
- Department of Psychiatry, Psychotherapy and Psychosomatics, RWTH Aachen University, Aachen, Germany, and JARA - Translational Brain Medicine
| | - Bernhard Wolf
- Medical Care Center, Dr. Stein and Colleagues, Moenchengladbach, Germany
| | - Christoph Hiemke
- Department of Psychiatry and Psychotherapy and Institute of Clinical Chemistry and Laboratory Medicine, University Medical Center of Mainz, Germany
| | - Sarah E Lammertz
- Department of Psychiatry, Psychotherapy and Psychosomatics, RWTH Aachen University, Aachen, Germany, and JARA - Translational Brain Medicine
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de Lange ECM, Hammarlund-Udenaes M. Translational aspects of blood-brain barrier transport and central nervous system effects of drugs: From discovery to patients. Clin Pharmacol Ther 2015; 97:380-94. [DOI: 10.1002/cpt.76] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2014] [Revised: 01/06/2015] [Accepted: 01/06/2015] [Indexed: 02/06/2023]
Affiliation(s)
- ECM de Lange
- Leiden Academic Centre for Drug Research; Division of Pharmacology; Leiden University, Gorlaeus Laboratories; Leiden The Netherlands
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Loryan I, Sinha V, Mackie C, Van Peer A, Drinkenburg WH, Vermeulen A, Heald D, Hammarlund-Udenaes M, Wassvik CM. Molecular properties determining unbound intracellular and extracellular brain exposure of CNS drug candidates. Mol Pharm 2014; 12:520-32. [PMID: 25496026 DOI: 10.1021/mp5005965] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
In the present work we sought to gain a mechanistic understanding of the physicochemical properties that influence the transport of unbound drug across the blood-brain barrier (BBB) as well as the intra- and extracellular drug exposure in the brain. Interpretable molecular descriptors that significantly contribute to the three key neuropharmacokinetic properties related to BBB drug transport (Kp,uu,brain), intracellular accumulation (Kp,uu,cell), and binding and distribution in the brain (Vu,brain) for a set of 40 compounds were identified using partial least-squares (PLS) analysis. The tailoring of drug properties for improved brain exposure includes decreasing the polarity and/or hydrogen bonding capacity. The design of CNS drug candidates with intracellular targets may benefit from an increase in basicity and/or the number of hydrogen bond donors. Applying this knowledge in drug discovery chemistry programs will allow designing compounds with more desirable CNS pharmacokinetic properties.
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Affiliation(s)
- Irena Loryan
- Translational PKPD Group, Department of Pharmaceutical Biosciences, Associate Member of SciLife Lab, Uppsala University , Uppsala, Sweden
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