| 摘要: | 雙節棍孢子植生蟲草(Phytocordyceps ninchukispora Su & Wang )屬麥
角菌科之真菌,係1985年於台灣發現的新屬植生蟲草(Phytocordyceps)之
單一種。將此菌株進行液態培養,把培養液離心取其上清液經超微過濾器
,分子篩及離子交換法可得到一純化的水溶性多糖 (PN-2) 。將此多糖進
行成份分析並用新法做各種生理活性測試。利用 Chitinase 分析可確定
此糖至少含三相鄰 N-Acetylgucosamine。將此糖經甲基化後水解再乙醯
化，其衍生物經 GC 比對和 GC Mass 分析，可知其主鍵為 β１ → ４
N-Acetylgucosamine，其第六C位置有些接Galactose Mannose 和
Threitol，其鍵結為 １ → ４鍵結。本水溶性多糖(PN-2)可減少小白鼠
皮下腫瘤惡化程度,延長壽命21% , 並明顯減少皮下腫瘤面積29% 。對
sarcoma-180 cell 腹水癌小鼠的體重可明顯降低11%。在抗人工肺臟腫瘤
轉移方面 i.v. PN-2 可降低肺中腫瘤結節數88% 。為解決人工計數肺中
腫瘤結節數的不客觀性本次研究利用CDDP,BrdUrd, PI偵測 S-180 cell
DNA特性, 發現可利用 S-180 cell DNA 含量和 normal lung cell DNA
含量不同,而可用Flow cytometry 正確計數腫瘤轉移肺臟中 S-180 腫瘤
cell 的百分比。為了解PN-2 抗腫瘤活性, 將PN-2 和 S-180 cell in
vitro 培養, 發現無細胞毒性。進行Ames test 知其無抗突變能力,也無
基因毒性。測試 PN-2 對末稍血液 T 、T4、T8、B. Macrophage 比率影
響, 知其可使 T, T4, Macrophage 顯著上升 (P<0.01) 為了解PN-2 是否
可降低S-180 cell分裂速度和能力, 以PI, BrdUrd 雙染色法用Flow
cytometry作cell cycle的測量,計算 PN-2 對S-180 cell kinetic
parameter 的影響, 結果顯示 PN-2 對 BrdUrd Labeling Index, DNA
synthetic time (Ts), G/S/G2M百分比皆無影響。但利用 BrdUrd 標幟
S-180 細胞追蹤測試則在S-180腹水癌中以PN-2,i.p.注射, 可使S-180
cell因macrophage活性增加而被吞噬掉, 因而使 S-180 cell在腹水中存
活時間降低45%。其間並發現PN-2有強烈 mitogen 作用, 可使週邊血液
WBC 分裂能力增加, PN-2 組6.7±0.6%, PBS 組 4.2±0.5%,( P<0.01
)。以 i.v.投與 PN-2 發現副作用極小, 對週邊血液 WBC, RBC, PLT,
HGB %L. %M. RDW, MPV, PDW, LYM, GRAN, HCT, MCH, PCT 值皆無影響,
僅對 MCV, MCHC 值有微小增加作用。
Phytocordyceps ninchukispora was a new species of the new genus
Phytocordyceps in the family of clavicipitaceae found in Taiwan
in 1985. In the liquid culture of P.ninchukispora, a water
soluble polysaccharide (PN-2) was isolated. This polysaccharide
was used for chemical structure and antitumer studies.Based on
the data obtained from chitinase assay and GC,GC/mass
spectrome- try, PN-2 appeared to be a polymer of β-1-4 N-
acetylglucosamine as the main chain with a molecular weigut
approxinately 1*10 ． The side chains of galactose, mannose and
threitol meioties were linked by β 1-4-linkage to the 6
position of glucosamine residues of the polymer. PN-2 reduced
subcutaneous tumor size by 29% and prolonged the life span of
mice implanted with S-180 cells by 21%. PN-2 also reduced the
nodule number in munine lung by 88% as demonstrated by
artificial metastasis test of the 14th day after S-180 cell
implantation. A flow-cytometric mesaurement was established to
distinguish normal lung cell and S-180 cell in the present
study. PN-2 had no direct cytotoxic effect on tumor cells and
was neutral in the Ames test. The antitumor activities were
evidenced by increasing total number of T cells, T4 cells and
macrophages as demonstrated by flow cytometric analysis. PN-2
dramatically reduced the viability of the tumor cell as
indicated by BrdVrd and PI staining,but had no effect on
labeling index of Brdulrd, DNA synthesis time (Ts) and G1/S/G2M
ratio. I.p. administration of PN-2 strongly activated
macrophages and a prominent mitogenic effect which resulted in
increasing WBC division ability. I.V.administration of PN-2 in
mice did not change the peripheral blood profiler inclluding
the percentage of WBC.RBC. PLT.HGB%L,%M,RDV,PDW,LYM,GRAN,HCT,
MCH and PCT;but slightly increased the values of MCV and MCHC. |
