title: Characterization of islet-infiltrating immunocytes after pancreas preservation by two-layer (UW/perfluorochemical) cold storage method.
abstract: Clinical islet transplantation offers the prospect of good blood glycemic control without major surgical risks. Nevertheless, long-term function of the transplanted islets is seldom appreciated because rejection is followed by the graft failure. Although it has been implicated that islets have high immunogenicity, characterization of the islet-infiltrating immunocytes, such as leukocytes and macrophages, has not been extensively studied. Rat islets were isolated by the collagenase digestion method and separated by handpicking under the microscope. The islets were further dispersed into individual cells for flow cytometric analysis. Monoclonal antibodies directed toward T cells, B cells, and macrophages as well as ICAM-1, and MHC class I and II were used to enumerate cells. Pancreatic islets contained 6.3 +/- 2.9% immunocytes; T cells (39.6 +/- 4.2%), B cells (44.7 +/- 5.8%), and macrophages (1.7 +/- 0.6%). MHC class I was expressed on 85.6 +/- 2.8%, MHC class II on 36.8 +/- 2.9%, and ICAM-1 on 39.9 +/- 7.0%. The results of islets from preserved pancreas also showed the same tendency. As these islet-infiltrating immunocytes within the grafts may contribute to the rejection, one potential strategy to prevent early graft loss might start to eliminate or inactivate the islet-infiltrating immunocytes.
authors.affiliation: Department of Gasteroenterological Surgery, Graduate School of Medical Sciences, Kobe University, Kobe, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Toyama
authors.forename: M
authors.initials: M
authors.lastname: Takada
authors.forename: T
authors.initials: T
authors.lastname: Tanaka
authors.forename: Y
authors.initials: Y
authors.lastname: Suzuki
authors.forename: Y
authors.initials: Y
authors.lastname: Kuroda
mesh_terms: D000241:Adenosine; D000493:Allopurinol; D000818:Animals; D003080:Cold Temperature; D005466:Fluorocarbons; D005978:Glutathione; D015395:Histocompatibility Antigens Class I / Q000032:analysis; D007328:Insulin; D007515:Islets of Langerhans / Q000166:cytology / Q000276:immunology; D008264:Macrophages / Q000276:immunology; D008297:Male; D009926:Organ Preservation / Q000379:methods*; D019188:Organ Preservation Solutions; D010179:Pancreas; D011887:Raffinose; D051381:Rats; D011917:Rats, Inbred Lew; D013601:T-Lymphocytes / Q000276:immunology
chemical_list: D005466:Fluorocarbons; D015395:Histocompatibility Antigens Class I; D007328:Insulin; D019188:Organ Preservation Solutions; C055206:University of Wisconsin-lactobionate solution; D000493:Allopurinol; D005978:Glutathione; D000241:Adenosine; D011887:Raffinose