免疫力の重要性

免疫力の重要性(めんえき-りょくのじゅうようせい)

免疫システムは体内の自然な治療の力を持っています。

私たちが風邪をひいたとき、私たちは熱が私を感じることができる。これは私たちの体の中で風邪のウイルス（インフルエンザ）と免疫システムが戦争をしているからである。このように私たちの体の中の免疫細胞が自然免疫反応の役割をするので、私たちは、健康を維持することができる。

私たちの体の免疫力が低下する、

1. 免疫不均衡によって様々な病気に苦しんで受けることができ、
2. たとえばAIDSウイルスに感染すると、、脳と脊髄の損傷が来る。これにより、認知症（アルツハイマー病）、またはヒト細胞の混乱で体のシステムが崩れるようになる。

stepdisease

Steps of diseases

Aging ▷ Infection ▷ Thymus smaller ▷ Chronic inflammation ▷ Chronic diseases
(Diabetes, Arteriosclerosis(hardening of the arteries), Cancer(Tumors), Alzheimer’s, Sarcopenia)

Correlation of Cancer Rate and Natural Killer Cells Activity

Research Paper: Natural cytotoxic activity of peripheral-blood lymphocytes and cancer incidence: an 11-year follow-up study of a general population

nkcells_activity

Natural cytotoxic activity of peripheral-blood mononuclear cells was assessed by isotope-release assay in 3625 residents of a Japanese population mostly older than 40 years of age, between 1986 and 1990. Immunological and biochemical markers were also measured, and participants were given a questionnaire on lifestyle. Research had progressed for 11-year.

Results indicate that medium and high cytotoxic activity of peripheral-blood lymphocytes is associated with reduced cancer risk, whereas low activity is associated with increased cancer risk suggesting a role for natural immunological host defenceable mechanisms against cancer.(The cancer incidence rate of Low Group is 1.7 times(Men) and 2 times(Women) as high as them of Middle and High Group.)

Group		Cytotoxic activity (%)
		Low	Middle	High
		≤34%	35%~51%	>51%
Rate of cancer cases	Men	9%	7%	6%
Rate of cancer cases	Women	4%	2%	2%

Importance of immunity and Natural Killer Cells’ activities is emphasized again.

Orgins : http://www.ncbi.nlm.nih.gov/pubmed/11117911

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