Human CD28 is an important costimulatory molecule found on all CD4+ T cells and on about half of the CD8+T cells. T cell activities attributed to CD28 include prevention of anergy, induction of cytokine gene transcription, stabilization of cytokine mRNAs and activation of CD8+ cytotoxic T lymphocytes. The ligands for CD28 identified as CD80 (B7-1) and CD86 (B7-2), are immunoglobulin superfamily monomeric transmembrane glycoprotein of 60 kd and 80 kd, respectively. Monovalencyof the CD28 receptor for its natural ligands is essential to providecostimulation without inducing responses in the absense of TCRengagement (5)
Molecular Structure:A soluble fusion protein consisting of the mature extracellular (134aa) domain of human CD28: nkilvkqspmlvaydnavnlsckysynlfsrefraslhkgldsavevcvvygnysqqlqvysktgfncdgklgnesvtfylqnlyvnqtdiyfckievmypppyldneksngtiihvkgkhlcpsplfpgpskp
+linker: gt
fused to murine IgG2a Fc + hinge (233aa): eprgptikpcppckcpapnllggpsvfifppkikdvlmislspivtcvvvdvseddpdvqiswfvnnvevhtaqtqthredynstlrvvsalpiqhqdwmsgkefkckvnnkdlpapiertiskpkgsvrapqvyvlpppeeemtkkqvtltcmvtdfmpediyvewtnngktelnykntepvldsdgsyfmysklrvekknwvernsyscsvvheglhnhhttksfsrtpg
predicted (non glycosylated ) monomeric molecular weight: 41.8 kd
predicted extinction coeficient: 1.13 OD for a 1mg/ml solution
Transfectant Cell Line: CHO
Functional Application: Recombinant human CD28 -muIg fusion protein blocks binding of anti-human CD28 to human tumor cells. In combination with IFN-gamma, CD28-muIg can stimulate dendritic cells in when a crosslinking agent is included (6).
References:
1. M.K. Jenkins & J.G. Johnson, (1993) Curr Opin Immunol 5: 361-367.
2. 61st Forum in Immunology, (1995) Res Immunol 146: 127-205.
3.I. Kariv, A. Truneh & R.W. Sweet, (1996) J Immunol 157: 29-38.
4. R.J. Peach, Linsley P.S., et al. J Biol Chem (1995) 270(36): 21181-21187.
5) K M Dennehy, T Hunig, et al, (2006) J Immunol 176: 5725-5729.
6. D H Munn, M D Sharma, A L Mellor (2004) J immunol 172(7): 4100-10. PMID: 15034022
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为了使供输血用的血液能保存一定时间，加入适当的抗凝剂，并尽量防止在保存期发生变质而用的液体。为了防止因糖的消失引起活力降低，尚加入葡萄糖。ACD液（含柠檬酸三钠、柠檬酸、葡萄糖）一般用于血库。添加ACD的血液放在4—6℃条件下保存，可保存三周。另外为防止柠檬酸盐的过量可用加磷酸钠的CPD液。此外还设计了加乳酸钠的ACDL液。如果加入甘油等防冻剂则可长时间冷冻保存红细胞。
目前选择这个都是北京博凌科为生物科技有限公司的
目前正在从新鲜病人肿瘤组织标本中提取细胞悬液进行阳性细胞的筛选，但由于实验室距离医院有3个小时的车程，请问什么储存方法或者储存液能短期保证肿瘤组织中细胞完整性？谢谢
