kuliah endokrin 2007
TRANSCRIPT
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SISTEM ENDOKRIN
BATASANSINYAL SELULER
MEKANISME KERJA
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Batasan :
• Kumpulan kelenjar dgn sekresi kurir kimia disebut HORMON
• Hormon membawa sinyal lewat darah, tiba di organ sasaran, diproses oleh reseptor yang tepat
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• RESPONS dr SISTEM ENDOKRIN (SE) sifatnya LAMBAT : menit, jam, bulan, atau tahun.
• Komunikasi SE melalui media yi HORMON
• Hormon menjadi molekul sinyal, dilepaskan oleh jaringan, organ, menuju ke sel sasaran utk menghasilkan respons.
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KLASIFIKASI :
1. Molekul sinyal dihasilkan oleh sel organ endokrin, asal tempat jauh, lewat pembuluh darh ke sel sasaran, disebut ENDOKRIN
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2. Sinyal molekul asal dari sel/organ dekat pada sel sasaran disebut PARAKRIN
3.Sinyal molekul berasal dari sel sendiri disebut AUTOKRIN
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1. MOLEKUL SINYAL : - HORMON
-NEUROTRANSMIT
- GROWTH
FACTORS
Disebut LIGAND
2.RESEPTOR : molekul protein, terletak pada permukaan sel, sitoplasma, inti.
Disebut RESEPTOR PROTEIN
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KARATERISTIK RESEPTOR :
1.Spesifisitas
2.Afinitas 3.Jenuh
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KATEGORI HORMON :
1. HIDROFILIK :
Larut dalam air: -peptida
-asam amino
2. LIPOFILIK :
Larut dalam lemak :
-terikat reseptor
permukaan sel
-terikat reseptor inti sel
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ANALOG HORMON : 1. AGONIS :
fungsi sama dengan hormon, ikat pd reseptor dan memberi respons.
2. ANTAGONIS:
terikat reseptor, tidak mengaktifkan hormon, tidak ada respons
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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.
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MEKANISME KERJA
1. 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 : hormon reseptor kompleks → DNA → hormon reseptor elemen → transkripsi → translasi → respons biologis
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JARINGAN :1. Mempunyai reseptor, afinitas thd
hormon. Reseptor pd membran plasma : peptida & asam amino (first messenger), mengaktifkan second messenger. 2nd messenger :-cAMP
-Ca++ -IP3 (inositol triphosphate) -DAG (diacylglycerol)
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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++
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HIPOTHALAMUS & HIPOPHYSE
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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
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HIPOFISE ANTERIOR :1. Thyrotropin2. Adrenocorticotropin3. Luteinizing hormone4. Follicle stimulating
hormone5. Growth hormone6. Prolactin7. Melanocyte
stimulating hormone8. Endorphine9. Enkephalin
HIPOFISE POSTERIOR :
1. Oxytocin2. vasopressin
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HORMON GASTER & USUS:Hormon lokasi kerjaGastrin gaster/duod as lambg & pepsin
Cck duod/jeju amylase
Gip usus hls insulin↑ /as lbgVip 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 ?
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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
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4.Makin besar T3 & T4 dalam darah, makin cepat metabolisme tubuh.
5.Dikontrol, monitor dan regulasi oleh hipofise & hipotalamus melalui TSH.
6.Pembesaran kel tiroid (goitre), tu oleh asupan iod (negative-feedback)
7.Hipertiroid, T3&T4 ↑, tu oleh peny Grave (otoimun, TSH sbg ab)
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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.
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KELENJAR ADRENAL
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• Kel adrenal dua organ jadi satu, td korteks & medulla.
• Korteks adrenal, sintesis & sekresi kortikosteroid tu cortisol, aldosteron dan tetosteron.
• Ada 3 zona :
1. Glomerulosa : aldosteron
2. Fasciculata :glukokortikoid
3. Reticularis :
Ada beda dan tumpang tindih bioaktivitas ke-3 hormon tsb.
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• Glukokortikoid : CRH → ACTH → glukokortikoid & androgen
• ACTH ↑ → kortisol ↑, mis Cushing’s syndrome
• Adrenacortical :adrenal crisis, kortisol
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• Cushing’ syndr :
- Hiperglikemia - moonface
- Nitrogen - Vit D3- Lipogenesis - osteoporosis
- Hiperlipidemia - kulit kasar & lepas
- BB↑ - imun
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• Adrenocrisis :
-stres -vomiting
-sakit kepala - diare
-hipotensi
• Addison’s disease : adrenocortical insuff chronis
-malas, lemah, anorexia, nausea
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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
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• ANDROGEN :
- androgen↑, disbt androgenital synd, virilisasi pd ♀, amenorea.
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Terima kasih !
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HORMON GINJAL
1. ERYTHROPOIETIN (EPO).2. CALCITRIOL (VIT D3).3. RENIN• EPO : - Glycoprotein, kerja pd bone marrow, dipicu
oleh perdarahan, daerah tinggi (O2) - dihasilkan juga di otak bila O2, mis pd
stroke
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• CALCITRIOL : - asal calciferol, kulit, bantuan UV - calciferol → D3 di hati, ginjal dgn bantuan PTH - bantu absorbsi usus - kekurangan: anak→ rickets dewasa → osteomalacia
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• 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 ↑
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KULIT
• Paparan UV → dehydrocholesterol → calciferol → sirkulasi → hati → vit D3 → ginjal → calcitriol ( bantuan PTH).
• Disebut hormon :
- dibuat pd sel tertentu
- masuk aliran darah
- transkripsi gen pd sel sasaran
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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
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TESTIS
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OVARIUM
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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
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inhibiting
PIF inhibit PRL
HIPOFISE gonadotroph
ant FSH folikel & spermto
LH estr & proges & testos
trophik
TSH tiroid
ACTH adrenal
GH somatomed
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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
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ovarium folikel
estrogen sex II, reprod tr,
umpan balik
inhibin inhibt FSH
korpus luteum
progest jaga kehamilan,
mama, umpan
balik
relaxin dilatasi serviks
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testis leydig
testosteron reprod ♂, spermt
sertoli
estrogen umpan blk (-) Gondt
inhibin inhibt FSH
plasenta
progest, estr, relaxin
HCG seperti LH
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SISTEM REPRODUKSI
• SEKSUAL
• ASEKSUAL
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