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9/16/2008 1 SISTEM ENDOKRI N BATASAN SINYAL SELULER MEKANISME KERJA PS Poli/endokrin/2005 1 Batasan : Kumpulan kelenjar dgn sekresi kurir kimia disebut HORMON Hormon membawa sinyal lewat darah, tiba di organ sasaran, diproses oleh reseptor yang tepat PS Poli/endokrin/2005 2

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SISTEM ENDOKRIN

BATASANSINYAL SELULER

MEKANISME KERJA

PS Poli/endokrin/2005 1

Batasan :

• Kumpulan kelenjar

dgn sekresi kurir

kimia disebut

HORMON

• Hormon membawa

sinyal lewat darah,

tiba di organ sasaran,

diproses oleh

reseptor yang tepat

PS Poli/endokrin/2005 2

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PS Poli/endokrin/2005 3

PS Poli/endokrin/2005 4

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PS Poli/endokrin/2005 5

PS Poli/endokrin/2005 6

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• RESPONS dr SISTEM ENDOKRIN(SE) sifatnya LAMBAT :LAMBAT : menit, jam,bulan, atau tahun.

• Komunikasi SE melalui media yiHORMONHORMON

• Hormon menjadi molekul sinyal,dilepaskan oleh jaringan, organ, menujuke sel sasaran utk menghasilkan

respons.

PS Poli/endokrin/2005 7

KLASIFIKASI :

1. Molekul sinyal

dihasilkan oleh sel

organ endokrin, asal

tempat jauh, lewat

pembuluh darh ke

sel sasaran, disebut

ENDOKRINENDOKRIN

PS Poli/endokrin/2005 8

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2. Sinyal molekul asal

dari sel/organ dekat

pada sel sasaran

disebut PARAKRINPARAKRIN

3.Sinyal molekul berasal

dari sel sendiri

disebut AUTOKRIN AUTOKRIN

PS Poli/endokrin/2005 9

PS Poli/endokrin/2005 10

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1. MOLEKUL SINYAL : -

HORMON

-NEUROTRANSMIT

- GROWTH

FACTORS

Disebut LIGANDLIGAND

2.RESEPTOR : molekul

protein, terletak pada

permukaan sel,

sitoplasma, inti.

Disebut RESEPTORRESEPTOR

PROTEINPROTEIN

PS Poli/endokrin/2005 11

KARATERISTIK RESEPTOR :

1.Spesifisitas

2.Afinitas

3.Jenuh

PS Poli/endokrin/2005 12

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KATEGORI HORMON :1.1. HIDROFILIK HIDROFILIK :

Larut dalam air: -peptida

-asam amino

2.2.LIPOFILIK LIPOFILIK :

Larut dalam lemak :

-terikat reseptor

permukaan sel

-terikat reseptor inti sel

PS Poli/endokrin/2005 13

PS Poli/endokrin/2005 14

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ANALOG HORMON :

1.1. AGONIS :AGONIS :

fungsi sama dengan hormon, ikat pd reseptor

dan memberi respons.

2. ANTAGONIS:ANTAGONIS:

terikat reseptor, tidak mengaktifkan hormon,

tidak ada respons

PS Poli/endokrin/2005 15

KARATERISTIK HORMON :

- Hormon normal ada dalam plasma, jar

interstitial

- Konsentrasi hormon 10 M s/d 10 ºM

- Terikat plasma protein utk diangkut,

mencegah kerusakan hormon &filtrasi ginjal, me↑ half life.

PS Poli/endokrin/2005 16

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PS Poli/endokrin/2005 17

MEKANISME KERJA1. Klasifikasi & Karateristik Hormon :

2. Jenis Reseptor :

a. Reseptor permukaan membran sel

aktifkan ensim → second messenger →fosforilase oleh protein kinase (PK ?) →respons biologis.

b. Reseptor sitoplasma / inti : hormonreseptor kompleks → DNA → hormonreseptor elemen → transkripsi → translasi →respons biologis

PS Poli/endokrin/2005 18

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JARINGAN :

1. Mempunyai reseptor, afinitas thd hormon.Reseptor pd membran plasma : peptida &asam amino (first messenger), mengaktifkansecond messenger. 2nd messenger :-cAMP

-Ca++

-IP3 (inositol triphosphate)

-DAG (diacylglycerol)

PS Poli/endokrin/2005 19

2.Sinyal transduksi :

a. reseptor + ligand → protein-G → adenylate

cyclase →cAMP →fosforilase protein : Protein

kinase A (PKA) & PKC

b. reseptor + ligand → protein G → fosfolipase

C → hidrolisa fosfatidylinositol bifosfat → IP3→ RE →Ca++

DAG :aktifkan PKC & Ca++

PS Poli/endokrin/2005 20

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PS Poli/endokrin/2005 21

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PS Poli/endokrin/2005 23

PS Poli/endokrin/2005 24

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PS Poli/endokrin/2005 25

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PS Poli/endokrin/2005 27

PS Poli/endokrin/2005 28

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PS Poli/endokrin/2005 29

PS Poli/endokrin/2005 30

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HIPOTHALAMUS & HIPOPHYSE

PS Poli/endokrin/2005 31

PS Poli/endokrin/2005 32

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HIPOFISE = pituitary gland-Master gland :kontrol produksi hormon

dari kelenjar endokrin lainnya.

-Hormon lob post dihasilkan oleh

hipotalamus → akson

-Hormon lob ant diproduksi & simpan,

releasing factor dari hipotalamus → p.

darah-Releasing & trophic hormones

PS Poli/endokrin/2005 33

HIPOFISE ANTERIOR :

1. Thyrotropin

2. Adrenocorticotropin

3. Luteinizing hormone

4. Follicle stimulatinghormone

5. Growth hormone

6. Prolactin

7. Melanocytestimulating hormone

8. Endorphine

9. Enkephalin

HIPOFISE POSTERIOR :1. Oxytocin

2. vasopressin

PS Poli/endokrin/2005 34

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PS Poli/endokrin/2005 35

PS Poli/endokrin/2005 36

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PS Poli/endokrin/2005 37

PS Poli/endokrin/2005 38

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PS Poli/endokrin/2005 39

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PS Poli/endokrin/2005 41

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PS Poli/endokrin/2005 43

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PS Poli/endokrin/2005 45

PS Poli/endokrin/2005 46

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PS Poli/endokrin/2005 47

HORMON GASTER & USUS:Hormon lokasi kerja

Gastrin gaster/duod as lambg & pepsin

Cck duod/jeju amylase

Gip usus hls insulin↑ /as lbg

Vip pankreas rlks usus/hco3↑

Motilin usus hls motilitas usus

Panc polypept pankreas hco3 & prot

Enkepalin lmbg, duod, empd aksi opiat

Subs p seluruh usus ?Bombesin lmbg duod gastrin cck ↑

Neurotensin ileum ?

Enteroglukagon usus hls, pankr ?

PS Poli/endokrin/2005 48

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KELENJAR TIROID

1. Sekresi hormon utk mengatur proses

metabolisme, pertumbuhan dan enersi

2. Ada 2 hormon utama, thyroxine (T4) & tri-

iodothyronine (T3)

3. Kebutuhan Iod manusia 150g / hr

4. Iod terutama dari makanan laut

PS Poli/endokrin/2005 49

PS Poli/endokrin/2005 50

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4.Makin besar T3 & T4 dalam darah, makincepat metabolisme tubuh.

5.Dikontrol, monitor dan regulasi oleh hipofise &hipotalamus melalui TSH.

6.Pembesaran kel tiroid (goitre), tu oleh asupaniod (negative-feedback)

7.Hipertiroid, T3&T4 ↑, tu oleh peny Grave

(otoimun, TSH sbg ab)

PS Poli/endokrin/2005 51

PS Poli/endokrin/2005 52

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8.Gejala hipertiroid : nadi cepat, tremor,

keringat, BB, nervous, fatigue, diare,

exopthalmus, goitre.

9.Hipotiroid : fatigue, dingin, depresi,

konsentrasi, pucat, hair loss, konstipasi,

goitre.

PS Poli/endokrin/2005 53

KELENJAR ADRENAL

PS Poli/endokrin/2005 54

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• Kel adrenal duaorgan jadi satu, tdkorteks & medulla.

• Korteks adrenal,sintesis & sekresikortikosteroid tucortisol,aldosteron dantetosteron.

• Ada 3 zona :1. Glomerulosa :

aldosteron

2. Fasciculata

:glukokortikoid

3. Reticularis :

Ada beda dan tumpang

tindih bioaktivitas

ke-3 hormon tsb.

PS Poli/endokrin/2005 55

PS Poli/endokrin/2005 56

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• Glukokortikoid : CRH → ACTH →

glukokortikoid & androgen

• ACTH ↑ → kortisol ↑, mis Cushing’ssyndrome

• Adrenacortical :adrenal crisis, kortisol

PS Poli/endokrin/2005 57

PS Poli/endokrin/2005 58

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• Cushing’ syndr :

- Hiperglikemia - moonface

- Nitrogen - Vit D3

- Lipogenesis - osteoporosis

- Hiperlipidemia - kulit kasar & lepas

- BB↑ - imun

PS Poli/endokrin/2005 59

• Adrenocrisis :

-stres -vomiting

-sakit kepala - diare

-hipotensi

• Addison’s disease : adrenocortical insuff

chronis-malas, lemah, anorexia, nausea

PS Poli/endokrin/2005 60

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• Aldosteron :

- Na+ reab ↑, K+ ekskresi tub distalis

- pe↑ aldosteron, edema & hipertensi

- respons renin-angiotensin-system

- bebas pengaruh ACTH

- aldosteron ↑: hipernatremia, dehidrasi,

hemorrhage, hipokalemia

PS Poli/endokrin/2005 61

PS Poli/endokrin/2005 62

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• ANDROGEN :

- androgen↑, disbt androgenital synd, virilisasi pd ♀, amenorea.

PS Poli/endokrin/2005 63

PS Poli/endokrin/2005 64

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PS Poli/endokrin/2005 65

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PS Poli/endokrin/2005 67

PS Poli/endokrin/2005 68

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PS Poli/endokrin/2005 69

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PS Poli/endokrin/2005 71

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PS Poli/endokrin/2005 73

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PS Poli/endokrin/2005 75

Terima kasih !

PS Poli/endokrin/2005 76

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HORMON GINJAL

1. ERYTHROPOIETIN (EPO).

2. CALCITRIOL (VIT D3).

3. RENIN

• EPO :

- Glycoprotein, kerja pd bone marrow, dipicu olehperdarahan, daerah tinggi (O2)

- dihasilkan juga di otak bila O2, mis pd stroke

PS Poli/endokrin/2005 77

• CALCITRIOL :

- asal calciferol, kulit, bantuan UV

- calciferol → D3 di hati, ginjal dgn

bantuan PTH

- bantu absorbsi usus

- kekurangan: anak→ rickets

dewasa → osteomalacia

PS Poli/endokrin/2005 78

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4

• RENIN :

- monitor tek darah (ginjal)

- kerja pd angiotensinogen →

angiotensin I →ACE → angiotensin II

- terjadi : konstriksi arteriole, reabs

Na+, pelepasan aldosteron,

kontraksi jantung ↑, stimulus hipofise lepas

ADH, → tek darah ↑

PS Poli/endokrin/2005 79

KULIT 

• Paparan UV → dehydrocholesterol →

calciferol → sirkulasi → hati → vit D3

→ ginjal → calcitriolcalcitriol ( bantuan PTH).

• Disebut hormon :

- dibuat pd sel tertentu

- masuk aliran darah

- transkripsi gen pd sel sasaran

PS Poli/endokrin/2005 80

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4

JANTUNG

1. Atrial Natriuretic Peptide (ANP) :

dilepas oleh atrium, pd kondisi?

2. Brain Natriuretic Peptide (BNP) :

dilepas oleh ventrikel

Ke2nya berfungsi :

- relaksasi arteriole

- inhibisi renin & aldosteron- inhibisi reabs Na+ pd ginjal

PS Poli/endokrin/2005 81

TESTIS

PS Poli/endokrin/2005 82

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4

OVARIUM

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PS Poli/endokrin/2005 94

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• Kelenjar hormon kerja

1.Pineal melatonin terang/gelap,

BB, reproduksi

2.Hipotala releasing :

mus GnRH FSH & LH (hipof)

TRH TSH & PRL

CRH ACTH

GRH GH

PS Poli/endokrin/2005 95

inhibitingPIF inhibit PRL

HIPOFISE gonadotroph

ant FSH folikel & spermto

LH estr & proges & testos

trophik 

TSH tiroid

ACTH adrenal

GH somatomed

PS Poli/endokrin/2005 96

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intermed MSH pigmentasi

post oxytocin susu, uterus

vasopres ↑ air & garam

tiroid T3 & T4 pert, metab, enersi

paratir pth, calcit metab ca

pankreas insulin gula , msk sel

glucagon gula↑, gluconeo

adrenal kortisol dst

aldosteron

testost

PS Poli/endokrin/2005 97

ovarium  folikelestrogen sex II, reprod tr,

umpan balik

inhibin inhibt FSH

korpus luteum

progest jaga kehamilan,

mama, umpan

balik

relaxin dilatasi serviks

PS Poli/endokrin/2005 98

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testis leydig

testosteron reprod ♂, spermt

sertoli

estrogen umpan blk (-) Gondt

inhibin inhibt FSH

plasenta

progest, estr, relaxin

HCG seperti LH

PS Poli/endokrin/2005 99

SISTEM REPRODUKSI• SEKSUAL

• ASEKSUAL

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PS Poli/endokrin/2005 105

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PS Poli/endokrin/2005 111

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PS Poli/endokrin/2005 113

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PS Poli/endokrin/2005 115

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PS Poli/endokrin/2005 117

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