title: [Quantities and function of NK cells in patients with positive BMMNC-Coombs test and cytopenia].
abstract: OBJECTIVE
  To test NK cell quantities and function in patients with positive BMMNC-Coombs test (CBCPC) and cytopenia and to explore how NK cell participate in the progress of this disease.
  
  
  METHODS
  The percentage of CD3(-)CD56(+) NK cell in peripheral blood lymphocytes, the expression of activating receptor (NKG2D, NKp46, NKp44), inhibitory receptor (CD158a, CD158b), perforin and granzyme-β were detected by flow cytometry. All samples were taken from 42 patients (22 newly diagnosed and 20 in remission) and 12 healthy volunteers. The correlation between the above parameters and patients' clinical profile were evaluated.
  
  
  RESULTS
  ①The percentage of CD3(-)CD56(+) NK cell in new diagnosed and remission CBCPC patients were significantly lower than that in healthy control [(10.04 ± 5.33)% vs (19.94 ± 7.38)%; (11.62 ± 6.80)% vs (19.94 ± 7.38)%, all P<0.01]. ② The expression of activating receptor NKG2D in new diagnosed CBCPC patients was significantly higher than that in remission group and healthy control [(74.03±18.24)% vs (45.97±29.45)%; (74.03±18.24)% vs (41.89± 15.34)% , P <0.01]. ③The expression of inhibitory receptor CD158a in new diagnosed CBCPC patients was significantly lower than that in remission group and healthy control (median: 3.72% vs 16.10%, P= 0.015; 3.72% vs 11.04%, P=0.025). ④The expression of perforin in new diagnosed and remitted CBCPC patients were significantly higher than that in healthy controls [(75.71±10.14) % vs (57.20±18.85)%, P= 0.018; (77.88±22.82)% vs (57.20±18.85)%, P=0.008]. ⑤The product of NK cell percentage and perforin expression in new diagnosed and remission CBCPC patient were significantly lower than that in healthy control [(7.68±4.54)% vs (12.13±5.19)%, P=0.011; (8.24±5.80)% vs (12.13±5.19)%, P=0.023]. The product of NK cell percentage and granzyme-β expression in the new diagnosed and remission CBCPC patient were significantly lower than that in healthy control [(7.83±5.26)% vs (14.79±8.37)%, P=0.008; (8.37 ± 6.83)% vs (14.79±8.37)%, P=0.012].
  
  
  CONCLUSIONS
  Deceased quantities and impaired total NK function might play a role in pathogenesis of CBCPC.
authors.affiliation: Department of Hematology, General Hospital, Tianjin Medical University, Tianjin 300052, China.
authors.forename: X
authors.initials: X
authors.lastname: Yuan
authors.forename: R
authors.initials: R
authors.lastname: Fu
authors.forename: H
authors.initials: H
authors.lastname: Liu
authors.forename: Y H
authors.initials: YH
authors.lastname: Wang
authors.forename: L J
authors.initials: LJ
authors.lastname: Li
authors.forename: C Y
authors.initials: CY
authors.lastname: Liu
authors.forename: H L
authors.initials: HL
authors.lastname: Wang
authors.forename: Y Y
authors.initials: YY
authors.lastname: Shao
authors.forename: K
authors.initials: K
authors.lastname: Ding
authors.forename: J
authors.initials: J
authors.lastname: Chen
authors.forename: E B
authors.initials: EB
authors.lastname: Ruan
authors.forename: H Q
authors.initials: HQ
authors.lastname: Wang
authors.forename: J
authors.initials: J
authors.lastname: Song
authors.forename: G J
authors.initials: GJ
authors.lastname: Wang
authors.forename: Z H
authors.initials: ZH
authors.lastname: Shao
mesh_terms: D016022:Case-Control Studies; D003298:Coombs Test; D005434:Flow Cytometry; D053804:Granzymes / Q000378:metabolism; D006801:Humans; D007694:Killer Cells, Natural / Q000166:cytology*; D055655:NK Cell Lectin-Like Receptor Subfamily K / Q000378:metabolism; D055629:Natural Cytotoxicity Triggering Receptor 2 / Q000378:metabolism; D054353:Perforin / Q000378:metabolism; D054340:Receptors, KIR / Q000378:metabolism; D013921:Thrombocytopenia / Q000503:physiopathology*
chemical_list: C527085:KLRK1 protein, human; C112837:NCR2 protein, human; D055655:NK Cell Lectin-Like Receptor Subfamily K; D055629:Natural Cytotoxicity Triggering Receptor 2; D054340:Receptors, KIR; D054353:Perforin; C509213:GZMB protein, human; D053804:Granzymes