Abstract:
:Biological pacing has been proposed as a physiologic counterpart to electronic pacing, and the sinoatrial node (SAN) is the general standard for biological pacemakers. We tested the expression of SAN pacemaker cell activity when implanted autologously in the right ventricle (RV). We induced complete heart block and implanted electronic pacemakers in the RV of adult mongrel dogs. Autologous SAN cells isolated enzymatically were studied by patch clamp to confirm SAN identity. SAN cells (400,000) were injected into the RV subepicardial free wall and dogs were monitored for 2 weeks. Pacemaker function was assessed by overdrive pacing and IV epinephrine challenge. SAN cells expressed a time-dependent inward current (I(f)) activating on hyperpolarization: density = 4.3 ± 0.6 pA/pF at -105 mV. Four of the six dogs demonstrated >50% of beats originating from the implant site at 24 h. Biological pacemaker rates on days 7-14 = 45-55 bpm and post-overdrive escape times = 1.5-2.5 s. Brisk catecholamine responsiveness occurred. Dogs implanted with autologous SAN cells manifest biological pacing properties dissimilar from those of the anatomic SAN. This highlights the importance of cell and substrate interaction in generating biological pacemaker function.
journal_name
Cell Transplantjournal_title
Cell transplantationauthors
Zhang H,Lau DH,Shlapakova IN,Zhao X,Danilo P,Robinson RB,Cohen IS,Qu D,Xu Z,Rosen MRdoi
10.3727/096368911X565038subject
Has Abstractpub_date
2011-01-01 00:00:00pages
1907-14issue
11-12eissn
0963-6897issn
1555-3892pii
ct0253zhangetalpdfjournal_volume
20pub_type
杂志文章abstract::Hematopoietic stem cells (HSCs) migrate to injury sites and aid in tissue repair. However, clinical success is poor and is partially due to limited HSC recruitment. We hypothesized that HSC pretreatment with H2O2 would enhance their recruitment to injured gut. As HSCs are rare cells, the number of primary cells obtain...
journal_title:Cell transplantation
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journal_title:Cell transplantation
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abstract::Tumor recurrence is the main limitation of liver transplantation (LT) in patients with hepatocellular carcinoma (HCC) and can be promoted by immunosuppressants. However, there is no prevention or treatment for HCC recurrence after LT. Here we describe a clinical-scale method for an adoptive immunotherapy approach that...
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journal_title:Cell transplantation
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journal_title:Cell transplantation
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journal_title:Cell transplantation
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pub_type: 杂志文章,评审
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journal_title:Cell transplantation
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journal_title:Cell transplantation
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journal_title:Cell transplantation
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journal_title:Cell transplantation
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更新日期:2019-06-01 00:00:00
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更新日期:2017-11-01 00:00:00
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journal_title:Cell transplantation
pub_type: 临床试验,杂志文章
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更新日期:2013-01-01 00:00:00
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journal_title:Cell transplantation
pub_type: 临床试验,杂志文章,随机对照试验
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pub_type: 杂志文章,评审
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journal_title:Cell transplantation
pub_type: 杂志文章,评审
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